US20110180617A1 - Electric heating device and vehicle air conditioner - Google Patents
Electric heating device and vehicle air conditioner Download PDFInfo
- Publication number
- US20110180617A1 US20110180617A1 US12/912,319 US91231910A US2011180617A1 US 20110180617 A1 US20110180617 A1 US 20110180617A1 US 91231910 A US91231910 A US 91231910A US 2011180617 A1 US2011180617 A1 US 2011180617A1
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- fluid
- heating device
- electric heating
- header
- flow paths
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- 238000005485 electric heating Methods 0.000 title claims abstract description 111
- 239000012530 fluid Substances 0.000 claims abstract description 136
- 238000010438 heat treatment Methods 0.000 claims abstract description 132
- 238000004378 air conditioning Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 description 17
- 239000000758 substrate Substances 0.000 description 13
- 230000007423 decrease Effects 0.000 description 8
- 238000012795 verification Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
- B60H1/2221—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters arrangements of electric heaters for heating an intermediate liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
- F24H3/0429—For vehicles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
- F24H3/0429—For vehicles
- F24H3/0452—Frame constructions
- F24H3/0464—Two-piece frames, e.g. two-shell frames, also including frames as a central body with two covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/12—Air heaters with additional heating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1863—Arrangement or mounting of electric heating means
- F24H9/1872—PTC
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
- H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2259—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal
- B60H2001/2265—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal related to the quantity of heat produced by the heater
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H2001/2268—Constructional features
- B60H2001/2271—Heat exchangers, burners, ignition devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
- F24H3/0429—For vehicles
- F24H3/0441—Interfaces between the electrodes of a resistive heating element and the power supply means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/022—Heaters specially adapted for heating gaseous material
- H05B2203/023—Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system
Definitions
- the present invention relates to an electric heating device that heats fluid by using a heating element, and a vehicle air conditioner including the same.
- a vehicle such as a car
- air inside and outside the vehicle interior is taken in, and an air temperature is adjusted to a predetermined air blowing temperature by air heated by heat exchange with fluid, which is a heating medium, and cooling air cooled by heat exchange, and the temperature-adjusted air is blown into the vehicle interior.
- fluid which is a heating medium, and cooling air cooled by heat exchange
- the temperature-adjusted air is blown into the vehicle interior.
- the fluid that becomes a heat source for heating is heated by a heating unit before the heat exchange with the air.
- an electric heating device is used as the heating unit.
- the electric heating device a device that uses a plurality of heating elements that generate heat by energization has been known.
- Patent Literature 1 an electric heating device having a plurality of circulation chambers and heating chambers is disclosed.
- a medium flows into the respective circulation chambers, and a heating element is held in the respective heating chambers.
- the medium that flows in the circulation chambers is heated by the heating element held in the heating chambers.
- Patent Literature 1 discloses that the medium is a fluid medium. Further, it also discloses that the heating element is a PTC (Positive Temperature Coefficient) element. The PTC element generates heat by being energized.
- PTC Physical Temperature Coefficient
- Patent Literature 1 because performing heating according to the flow rate of the medium in the circulation chamber is not taken into consideration, when the heating element in the circulation chamber having a small flow rate is energized, the quantity of heating becomes less, and as a result, heating efficiency decreases and unnecessary power is consumed.
- the present invention has been achieved to solve the above problems, and an object of the present invention is to provide an electric heating device that can efficiently heat fluid at the time of intermediate output, and a vehicle air conditioner including the electric heating device.
- an electric heating device includes: a plurality of flow paths in which fluid flows; and a plurality of heating modules arranged adjacent to the flow paths and including heating elements that generate heat by energization. At a time of intermediate output, the heating element in the heating module provided adjacent to a flow path among the plurality of flow paths having a relatively large flow rate of fluid is energized.
- the electric heating device at the time of intermediate output, a flow path among the plurality of flow paths having a relatively large flow rate of fluid is heated. Because a quantity of heat that can be provided to fluid flowing in the flow path increases as the flow rate of fluid increases, heating efficiency at the time of intermediate output can be improved. Further, because a predetermined quantity of heat can be acquired quickly, supply of fluid to the electric heating device can be stopped at an early stage. Therefore, power or the like required for supplying fluid to the electric heating device can be reduced.
- the heating element is a PTC element.
- the PTC element generates heat by energization. Upon reaching a certain temperature, the PTC element largely increases its resistance and is held at the certain temperature. Further, as the temperature increases, a value of an electric current flowing in the PTC element decreases. According to the electric heating device, therefore, an abnormal temperature increase in the heating module can be prevented. Further, power consumption required for generating heat in the heating elements can be reduced.
- the electric heating device includes: a first header that is provided at one end of the flow paths and supplies fluid to the flow paths; and a second header that is provided at the other end of the flow paths and collects fluid discharged from the flow paths.
- the first header includes a fluid supply port for supplying fluid into the first header
- the second header includes a fluid discharge port for discharging fluid to outside of the second header.
- Fluid supplied from the fluid supply port to the first header sequentially flows from a flow path close to the fluid supply port toward a flow path away from the fluid supply port. Therefore, a static pressure distribution is generated in the first header. Also in the second header, a static pressure distribution is generated because static pressure near the fluid discharge port decreases most. Due to the static pressure distribution in the headers, a magnitude of flow rate of fluid differs in each flow path. According to the electric heating device, even when there is a difference in the magnitude of flow rate in the respective flow paths due to the static pressure distribution in the headers, heating efficiency at the time of intermediate output can be improved. Further, in the electric heating device, fluid is supplied from the first header to the flow path formed of a tubular structure, for example, a tube. Fluid discharged from the flow path is collected in the second header. Therefore, leakage of fluid to outside of the flow path can be suppressed, as compared with a structure in which flow paths are formed by partitioning a casing by walls or the like.
- a vehicle air conditioner includes: a blower that takes outside air into an air flow path of an air conditioning unit and circulates air in a vehicle interior; a cooler that is arranged on a downstream side of the blower and cools outside air; and a heater that is arranged on a downstream side of the cooler and heats air cooled by the cooler.
- An electric heating device for heating fluid supplied to the heater is provided, and the electric heating device is the electric heating device discussed above, and includes a circulation circuit for circulating the fluid to the electric heating device.
- the electric heating device according to any one of inventions described above when adjustment of temperature to approximate an intermediate temperature between heating and cooling in an intermediate period (in the spring and autumn) is required, the electric heating device according to the inventions described above provided in the vehicle air conditioner is set to intermediate output at which a part of the heating elements is energized. At this time, the electric heating device can preferentially heat a flow path having a relatively large flow rate of fluid, and thus unnecessary power consumption can be suppressed and heating efficiency can be improved. As a result of improving the heating efficiency, the flow rate that becomes a required quantity of heating can be reduced, thereby enabling to suppress driving power of a fluid supply unit that supplying fluid, such as a pump. Particularly, in a case of an electric car, power consumption of the entire car can be suppressed, thereby enabling to increase its driving efficiency.
- the vehicle air conditioner includes a controller that includes an in-vehicle temperature detector and instructs a predetermined output to the electric heating device according to an in-vehicle temperature detected by the in-vehicle temperature detector.
- the vehicle air conditioner optimum output control of the electric heating device provided in the vehicle air conditioner according to the in-vehicle temperature is realized. Therefore, the heating efficiency of the electric heating device is further improved, and power consumption by the vehicle air conditioner can be further suppressed. Particularly, in a case of an electric car, power consumption of the entire car can be suppressed, thereby enabling to increase its driving efficiency.
- fluid can be heated efficiently at the time of intermediate output of the electric heating device.
- the vehicle air conditioner of the present invention at the time of intermediate output of the electric heating device, power consumption of the vehicle air conditioner can be reduced.
- FIG. 1 is a perspective view of an overall configuration of an electric heating device according to a first embodiment.
- FIG. 2 is an exploded perspective view for explaining a configuration of the electric heating device shown in FIG. 1 .
- FIG. 3 is a sectional view for explaining a configuration of the electric heating device shown in FIGS. 1 and 2 .
- FIG. 4 is an exploded perspective view for explaining a configuration of a heating module shown in FIG. 1 .
- FIG. 5 is a conceptual diagram of a static pressure distribution in each header.
- FIG. 6 is a sectional view for explaining a verification example of the electric heating device according to the first embodiment.
- FIG. 7 depicts a flow rate of fluid flowing in respective flow paths of the electric heating device shown in FIG. 6 .
- FIG. 8 is a schematic configuration diagram of a vehicle air conditioner.
- FIG. 1 is a perspective view of an overall configuration of an electric heating device according to a first embodiment.
- FIG. 2 is an exploded perspective view for explaining the configuration of the electric heating device shown in FIG. 1 .
- FIG. 3 is a sectional view for explaining the configuration of the electric heating device shown in FIGS. 1 and 2 .
- FIG. 3 is a sectional view in which a surface cut along a one-dot chain line in FIG. 1 is viewed from a second header 13 toward a direction of a first header 11 .
- FIG. 3 is a sectional view of a casing 9 orthogonal to a longitudinal direction of a flow path 3 as viewed from the second header 13 toward the direction of the first header 11 .
- the electric heating device 1 includes the flow path 3 and a heating module 5 .
- Heating elements 7 are held in the heating module 5 .
- the flow paths 3 and the heating modules 5 are alternately arranged in the casing 9 .
- a direction in which the flow paths 3 and the heating modules 5 are alternately arranged is a lateral direction, and a direction orthogonal to the lateral direction is a longitudinal direction, for descriptive purposes.
- the flow path 3 can have a tubular structure, and it can be a tube.
- a plurality of flow paths 3 are provided in parallel in the casing 9 .
- the flow paths 3 are arranged so that a plurality of rows are formed in the lateral direction and in the longitudinal direction.
- the flow paths 3 are arranged in two rows in the longitudinal direction and in ten rows in the lateral direction; however, these can be appropriately changed according to a place where the electric heating device 1 is arranged and a required output.
- the flow path 3 can be arranged in one row in the longitudinal direction.
- the flow path 3 is provided such that one end face opens in the first header 11 , and the other end face opens in the second header 13 . That is, the first header 11 and the second header 13 are communicated with each other by the flow path 3 .
- the first header 11 includes a fluid supply port 15 for introducing fluid into the first header 11 .
- the second header 13 includes a fluid discharge port 17 for discharging fluid to outside of the second header 13 .
- the fluid supply port 15 and the fluid discharge port 17 open in the same direction in the lateral direction.
- the respective heating modules 5 are arranged between the flow paths 3 adjacent to each other in the lateral direction. In other words, the heating modules 5 are arranged between rows of the flow paths 3 in the lateral direction. In the electric heating device 1 , eight heating modules 5 are provided between rows of the flow paths 3 in the lateral direction; however, the number thereof can be appropriately changed according to the arrangement of the flow paths 3 , the configuration of the heating module 5 or the like.
- the heating module 5 includes the heating element 7 , an electrode plate 19 , and an insulating plate 21 .
- FIG. 4 is an exploded perspective view for explaining the configuration of the heating module shown in FIG. 1 .
- the electrode plates 19 are provided on both sides of the heating element 7 .
- the insulating plates 21 are provided on the side opposite to a surface of the electrode plate 19 in contact with the heating element 7 .
- the heating elements 7 , the electrode plates 19 , and the insulating plates 21 are held in a frame 23 to constitute the heating module 5 .
- the frame 23 is formed of a resin material having a high heat resistance, for example, polyphenylene sulfide.
- the insulating plate 21 insulates between the heating module 5 and the flow path 3 , and alumina (aluminum oxide, Al 2 O 3 ) is used as a material therefor.
- the insulating plate 21 is heat-transferably connected to the electrode plate 19 and the flow path 3 .
- the electrode plate 19 is electrically connected to a substrate 25 shown in FIG. 3 .
- the electrode plate 19 is electrically connected to the heating element 7 , so that heat transfer therebetween is possible.
- the electrode plate 19 and the heating element 7 can be bonded by using, for example, thermosetting silicon.
- the electrode plate 19 includes a protrusion 19 a formed by protruding a part of the electrode plate 19 .
- the protrusion 19 a is connected to the substrate 25 provided in the casing 9 . In the lateral direction in the cross-sectional surface of the casing 9 orthogonal to the longitudinal direction of the flow path 3 , the respective protrusions 19 a protruding from the adjacent heating modules 5 can be connected with each other, and the protrusion 19 a can be connected to the substrate 25 .
- the substrate 25 has a function of energizing the electrode plate 19 provided in the heating module 5 via the protrusion 19 a of the electrode plate 19 .
- the heating element 7 provided in contact with the electrode plate 19 is energized to generate heat.
- the heating element 7 can be a PTC element, which is a positive-temperature-coefficient thermistor element.
- the PTC element generates heat by energization. Upon reaching a certain temperature, the PTC element largely increases its resistance, and is held at a certain temperature. Further, as the temperature increases, a value of an electric current flowing in the PTC element decreases.
- a controller 27 determines output of the electric heating device 1 based on a detection value of the temperature or the like at a predetermined place, and transmits a control signal corresponding to the output to the substrate 25 .
- the output of the electric heating device 1 can be mainly divided into three, that is, maximum output, intermediate output, and minimum output.
- the substrate 25 is controlled to energize all of the electrode plates 19 .
- the electric heating device 1 is controlled to the minimum output, in other words, when the output is controlled to be zero, the substrate 25 is controlled to suspend energization to all of the electrode plates 19 .
- the electric heating device 1 is controlled to the intermediate output, which is in between the maximum output and the minimum output, the substrate 25 is controlled to energize parts of the electrode plates 19 and suspend energization to the remaining electrode plates 19 .
- Fluid boosted by a fluid supply unit (not shown), for example, by a pump is supplied into the first header 11 via the fluid supply port 15 .
- Fluid supplied to the first header 11 flows sequentially from the flow path 3 closest to the fluid supply port 15 .
- Fluid flowing into the flow path 3 is heated by heat exchange with the heating module 5 provided adjacent to the flow path 3 and flows out to the second header 13 .
- Fluid flowing out to the second header 13 is discharged to outside of the second header 13 via the fluid discharge port 17 .
- a quantity of heat that can be given to fluid flowing in the adjacent flow path 3 by the heating module 5 can be indicated by the following equation 1.
- Q denotes a quantity of heat given to fluid by the heating module 5
- k denotes an overall heat transfer coefficient indicating thermal conductivity
- A denotes a heat transmission area
- T p denotes a surface temperature of the heating element 7
- T w denotes a temperature of fluid
- Q S denotes a flow rate of fluid in the flow path 3 .
- the overall heat transfer coefficient k and the flow rate Q S of fluid are substantially in a proportional relation, and when Q S increases, k also increases.
- the heat transmission area A is constant
- T w of fluid is constant.
- the heating element 7 held by a part of the heating module 5 is energized by the substrate 25 via the electrode plate 19 .
- the quantity of heat Q given to fluid by the heating module 5 increases, as the flow rate Q S increases.
- the electric heating device 1 preferentially selects and energizes a heating element held by the heating module 5 provided adjacent to the flow path 3 having a relatively large flow rate of fluid.
- FIG. 5 is a conceptual diagram of a static pressure distribution in the header. Static pressure inside the first header 11 or inside the second header 13 is plotted on a Y-axis in FIG. 5 . A position in the first header 11 or the second header 13 is plotted on an X-axis in FIG. 5 . In other words, the X-axis shows a distance from the end of the first header 11 on the fluid supply port 15 side or a distance from the end of the second header 13 on the fluid discharge port 17 side.
- the fluid having flown into the first header 11 from the fluid supply port 15 flows sequentially from the flow path 3 closest to the fluid supply port 15 toward the flow path 3 away from the fluid supply port 15 . Therefore, in the first header 11 , the flow rate of fluid decreases as moving away from the fluid supply port 15 and flow velocity becomes slow. Along with this, as shown in FIG. 5 , the static pressure in the first header 11 increases as moving away from the fluid supply port 15 . On the other hand, in the second header 13 , the flow rate of fluid increases as approaching the fluid discharge port 17 and the static pressure decreases as shown in FIG. 5 .
- the flow rate of fluid in the respective flow paths 3 is determined based on a static pressure difference ⁇ P between the first header 11 and the second header 13 where the flow path 3 is located. That is, the flow rate of fluid flowing in the flow path 3 increases, as the static pressure difference ⁇ P between the first header 11 and the second header 13 increases.
- FIG. 5 when the static pressure difference ⁇ P is explained by using the first header 11 , the static pressure difference ⁇ P decreases from the end of the first header 11 on the fluid supply port 15 side toward a central part of the first header 11 . Further, the static pressure difference ⁇ P increases from the central part of the first header 11 toward the end of the first header 11 on a side opposite to the fluid supply port 15 .
- the flow rate of fluid in the flow path 3 positioned in the central part in the lateral direction becomes the smallest, and the flow rate thereof in the flow path 3 positioned on the opposite ends in the lateral direction increases.
- the heating element 7 held by the heating module 5 adjacent to the flow path 3 positioned on the outermost side is preferentially selected and energized.
- the flow path 3 having a relatively large flow rate of fluid, of the flow paths 3 can be preferentially selected and heated. That is, in the lateral direction in the cross-sectional surface of the casing 9 orthogonal to the longitudinal direction of the flow path 3 , the flow path 3 on the outermost side can be preferentially selected and heated.
- the quantity of the heat Q that can be given to fluid by the heating module 5 increases as the flow rate Q S of fluid flowing in the flow path 3 increases. Therefore, when the electric heating device 1 is used, heating efficiency at the time of intermediate output can be improved.
- the electric heating device 1 includes the first header 11 and the second header 13 .
- the flow path 3 is for example, a tubular structure such as a tube, and the end face thereof opens in the first header 11 and the second header 13 . Because fluid heated by heat exchange with the heating module 5 flows in the flow path 3 , leakage of fluid to outside of the flow path can be suppressed, as compared with a structure in which the flow path 3 is formed by partitioning the casing 9 by walls or the like.
- the electric heating device 1 In the electric heating device 1 , a difference occurs in the flow rate in the flow path 3 due to provision of the first header 11 and the second header 13 .
- the electric heating device 1 does not include the first header 11 and the second header 13 , when a plurality of flow paths are provided in the casing, a difference in the flow rate of fluid between the respective flow paths occurs at least occasionally.
- the heating module 5 provided adjacent to the flow path and having a relatively large flow rate of fluid is preferentially selected at the time of intermediate output of the electric heating device, so that the heating elements 7 held by the heating module 5 generate heat, thereby enabling to improve the heating efficiency at the time of intermediate output.
- An electric heater or the like can be used as the heating element 7 in the electric heating device 1 ; however, it is desired to use the PTC element, which is the positive-temperature-coefficient thermistor element.
- the PTC element generates heat by energization. Upon reaching a certain temperature, the PTC element largely increases its resistance, and is held at the certain temperature. Further, as the temperature increases a value of an electric current flowing in the PTC element decreases. Accordingly, by using the PTC element as the heating element 7 , abnormal temperature rise in the heating module 5 in the electric heating device 1 can be prevented. Further, consumed power can be reduced, and power consumption required for heat generation of the heating element 7 can be also reduced.
- FIG. 6 is a sectional view for explaining a verification example of the electric heating device according to the first embodiment.
- FIG. 6 is a sectional view in which a surface cut along the one-dot chain line in FIG. 1 is viewed from the second header 13 toward a direction of the first header 11 .
- FIG. 6 is a sectional view of the casing 9 orthogonal to the longitudinal direction of the flow path 3 as viewed from the second header 13 toward the direction of the first header 11 .
- Like reference numerals refer to like members as those in the electric heating device 1 , and redundant explanations thereof will be omitted.
- the flow paths 3 are arranged in two rows in the longitudinal direction and nine rows in the lateral direction. As shown in FIG. 6 , when these are explained individually, the flow paths 3 are referred to, respectively, as a flow path 3 A to a flow path 3 I (an upper stage), and as a flow path 3 a to a flow path 3 i (a lower stage). In the electric heating device 101 , eight heating modules 5 are arranged between rows of the flow paths 3 in the lateral direction.
- the electrode plate 19 held by the heating module 5 includes the protrusion 19 a formed by protruding a part of the electrode plate 19 .
- the protrusions 19 a of the adjacent heating modules 5 are connected to each other.
- an energizing system 127 formed of two heating modules 5 is configured.
- the electric heating device 101 four energizing systems are provided, and as shown in FIG. 6 , when these are explained individually, the energizing systems 127 are referred to as energizing systems 127 a , 127 b , 127 c , and 127 d .
- the protrusions 19 a of the two heating modules 5 connected to each other are respectively connected to the substrate 25 provided in the casing 9 .
- FIG. 7 depicts a flow rate of fluid flowing in the respective flow paths of the electric heating device shown in FIG. 6 .
- a flow rate of fluid flowing in the respective flow paths 3 is plotted on the Y-axis, and the flow path number of the flow paths 3 , in other words, a position of each of the flow paths 3 is plotted on the X-axis.
- the values shown in FIG. 7 are acquired based on a flow analysis of fluid flowing in the flow paths 3 using a computer.
- the flow rate of the flow path 3 in outside rows is relatively large in the lateral direction in the cross-sectional surface of the casing 9 orthogonal to the longitudinal direction of the flow path 3 .
- the total flow rate of the flow paths 3 I and 3 i is the largest, and then the total flow rate of the flow paths 3 H and 3 h is the second largest, followed by the total flow rate of the flow paths 3 G and 3 g and the total flow rate of the flow paths 3 A and 3 a .
- the difference in the flow rate of fluid flowing in the flow paths 3 occurs due to a static pressure difference of fluid flowing in the first header 11 and the second header 13 .
- the heating element 7 held by the heating module 5 adjacent to the flow path 3 having a relatively large flow rate of fluid is preferentially energized.
- the energizing system 127 d formed of the heating module 5 that can heat the flow paths 3 I, 3 i , 3 H, and 3 h and the heating module that can heat the flow paths 3 H, 3 h , 3 G, and 3 g is preferentially energized by the substrate 25 .
- the energizing system 127 a is then preferentially energized, followed by the energizing system 127 c .
- the number of systems to be energized is appropriately determined based on the output acquired by the electric heating device 101 .
- the energizing systems 127 a and t 127 d are energized.
- energization is performed with respect to the energizing systems 127 a , 127 d , and 127 c.
- the energizing system 127 is formed by connecting the protrusions 19 a of the electrode plates 19 of two heating modules 5 with each other.
- one energizing system can be formed of one heating module 5 .
- the flow path to be heated can be finely selected as compared with a case that the one energizing system 127 is formed of two heating devices 7 .
- the number of wiring connections from a power supply unit (not shown) can be less than the number of connections to the respective heating modules 5 . Accordingly, in the electric heating device 101 , weight reduction and space saving are realized. Further, the above configuration contributes to reduction of man-hour at the time of assembling the electric heating device 101 .
- FIG. 8 is a schematic configuration diagram of a vehicle air conditioner.
- a vehicle air conditioner 201 according to a second embodiment of the present invention includes a casing 202 that forms an air flow path 202 A for taking outside air or air in vehicle interior to adjust the temperature thereof and leads the air to the vehicle interior.
- the electric heating device 101 according to the above embodiment shown in FIG. 6 is applied.
- the detailed configuration of the electric heating device 101 is as described above, and explanations thereof will be omitted.
- a blower 203 , a cooler 204 , a heater 205 , which is an air conditioning heat exchange unit, and an air mix damper 206 are provided in the casing 202 .
- a tank 207 , a pump 208 , and the electric heating device 101 according to the verification example described above are provided outside of the casing 202 .
- the tank 207 , the pump 208 , the electric heating device 101 , and the heater 205 constitute a fluid circulation route 209 in which fluid, which is a heating medium, circulates.
- the blower 203 sucks outside air or air in the vehicle interior to increase pressure, and feeds air to a downstream side of the blower 203 in the air flow path 202 A.
- the cooler 204 cools air fed from the blower 203 .
- the cooler 204 includes an expansion valve, an evaporator or the like, to cool air passing through the cooler 204 by heat of vaporization generated when a refrigerant circulating therein evaporates.
- the heater 205 heats air passing through the cooler 204 and cooled.
- a flow path in which fluid heated by the electric heating device 101 flows and a flow path in which air passes are provided inside the heater 205 . Air is heated by heat exchange between fluid heated by the electric heating device 101 and air passing through the heater 205 .
- the air mix damper 206 adjusts a rate between a quantity of air that passes through the heater 205 and a quantity of air that flows bypassing the heater 205 , to adjust a temperature of air mixed on the downstream side thereof. When heating is not required, the entire air is caused to bypass the heater 205 to reduce a pressure loss.
- the tank 207 temporarily holds a part of the heating medium that circulates in the fluid circulation route 209 .
- the tank 207 is arranged between the heater 205 and the pump 208 in the fluid circulation route 209 .
- the pump 208 compresses fluid and supplies the fluid to the electric heating device 101 .
- the pump 208 is arranged between the tank 207 and the electric heating device 101 in the fluid circulation route 209 .
- the downstream side of the casing 202 is connected to a plurality of vents that blow the temperature-adjusted air into the vehicle interior via a blowing-mode switching damper and duct.
- energizing systems 127 a , 127 b , 127 c , and 127 d are connected to the substrate 25 , and heating capacity thereof is controlled in three output stages, which are maximum output, minimum output (zero output), and intermediate output. Control is performed such that at the time of maximum output, all four systems are energized, at the time of minimum output, energization to all four systems are suspended, and at the time of intermediate output, only two systems are energized. Under such control, for example, a temperature sensor (not shown) provided in the vehicle interior detects the temperature in the vehicle interior and outputs a switching instruction from the controller 27 based on a detection value thereof to switch between the three stages.
- adjustment of temperature can be required to adjust a set temperature in the vehicle interior to an intermediate one in between heating and cooling. That is, hot air and cold air are mixed substantially at a 50:50 ratio and adjusted, and the temperature-adjusted air is blown into the vehicle interior.
- the controller 27 transmits an instruction value of intermediate output to the electric heating device 101 , and two systems are energized to heat fluid.
- the two energizing systems 127 a and 127 d adjacent to the flow paths 3 A, 3 a , 3 B, 3 b , 3 I, 3 i , 3 H, and 3 h having a large flow rate of fluid are energized. Accordingly, heating efficiency can be improved without consuming unnecessary power such as power for heating a flow path having a small flow rate.
- the flow rate of fluid can be also reduced to acquire a required quantity of heating, and power required to drive the pump for supplying fluid to the electric heating device 101 can be reduced. That is, a time (a flow rate) required for feeding fluid to acquire the required quantity of heating can be reduced, thereby reducing driving power of the pump.
- a time (a flow rate) required for feeding fluid to acquire the required quantity of heating can be reduced, thereby reducing driving power of the pump.
- the electric heating device 101 according to the first embodiment is used for heating fluid, which is a heating medium, power used for air conditioning in the vehicle interior can be reduced.
- the electric heating device 101 has high heating efficiency at the time of intermediate output. Accordingly, at the time of intermediate output of the electric heating device 101 , the flow rate of fluid circulated by the pump 208 can be reduced, and power consumed for driving the pump 208 can be also reduced.
- the electric heating device 101 according to the verification example is used; however, the electric heating device 1 can be also used.
- the electric heating device is useful for efficiently heating fluid flowing in the device at the time of intermediate output, and particularly suitable to be used as a heat source of an electric car or the like in which waste heat of an engine cannot be used as a heat source of a heating unit.
- the vehicle air conditioner according to the present invention is useful for decreasing the power to be used for air-conditioning in a vehicle interior.
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Abstract
[Problem to be Solved] An object is to provide an electric heating device that can heat fluid efficiently at a time of intermediate output, and a vehicle air conditioner including the electric heating device.
[Solution] To include a plurality of flow paths in which fluid flows and a plurality of heating modules arranged adjacent to the flow path and including heating elements that generate heat by energization. At the time of intermediate output, the heating element in the heating module provided adjacent to a flow path among the plurality of flow paths having a relatively large flow rate of fluid is energized.
Description
- The present invention relates to an electric heating device that heats fluid by using a heating element, and a vehicle air conditioner including the same.
- In a vehicle such as a car, when a vehicle interior is heated, air inside and outside the vehicle interior is taken in, and an air temperature is adjusted to a predetermined air blowing temperature by air heated by heat exchange with fluid, which is a heating medium, and cooling air cooled by heat exchange, and the temperature-adjusted air is blown into the vehicle interior. In this case, the fluid that becomes a heat source for heating is heated by a heating unit before the heat exchange with the air. In an electric car or the like that do not have an engine and thus cannot use waste heat of the engine as the heat source of the heating unit, an electric heating device is used as the heating unit. As the electric heating device, a device that uses a plurality of heating elements that generate heat by energization has been known.
- In
Patent Literature 1, an electric heating device having a plurality of circulation chambers and heating chambers is disclosed. A medium flows into the respective circulation chambers, and a heating element is held in the respective heating chambers. The medium that flows in the circulation chambers is heated by the heating element held in the heating chambers.Patent Literature 1 discloses that the medium is a fluid medium. Further, it also discloses that the heating element is a PTC (Positive Temperature Coefficient) element. The PTC element generates heat by being energized. -
- [PTL 1] Japanese Patent Application Laid-open No. 2008-7106 (
Claim 1, Claim 2, paragraph 0001, paragraph 0007, FIG. 3) - Generally, when maximum output is required for the electric heating device, all heating elements are energized. When required output is zero, energization to all heating elements is suspended. When the output required for the electric heating device is intermediate output, which is in between the maximum output and zero, a part of the heating elements is energized, and energization to the remaining heating elements is suspended.
- As described in
Patent Literature 1, when a plurality of circulation chambers, as flow paths in which fluid flows, are provided in the inside of the electric heating device, a flow rate in each of the circulation chambers of the medium supplied from an inlet port is not always uniform, and the flow rate will deviate. Generally, a quantity of heating of fluid by the heating elements depends on an amount of fluid to be heated. As described above, therefore, at the time of intermediate output when apart of the heating elements is energized, in view of heating efficiency, it is desired that fluid is heated by energizing the heating element in a circulation chamber having a larger flow rate, and energization in a circulation chamber having a smaller flow rate is suspended. - However, in
Patent Literature 1, because performing heating according to the flow rate of the medium in the circulation chamber is not taken into consideration, when the heating element in the circulation chamber having a small flow rate is energized, the quantity of heating becomes less, and as a result, heating efficiency decreases and unnecessary power is consumed. - The present invention has been achieved to solve the above problems, and an object of the present invention is to provide an electric heating device that can efficiently heat fluid at the time of intermediate output, and a vehicle air conditioner including the electric heating device.
- According to an aspect of the present invention, an electric heating device includes: a plurality of flow paths in which fluid flows; and a plurality of heating modules arranged adjacent to the flow paths and including heating elements that generate heat by energization. At a time of intermediate output, the heating element in the heating module provided adjacent to a flow path among the plurality of flow paths having a relatively large flow rate of fluid is energized.
- According to the electric heating device, at the time of intermediate output, a flow path among the plurality of flow paths having a relatively large flow rate of fluid is heated. Because a quantity of heat that can be provided to fluid flowing in the flow path increases as the flow rate of fluid increases, heating efficiency at the time of intermediate output can be improved. Further, because a predetermined quantity of heat can be acquired quickly, supply of fluid to the electric heating device can be stopped at an early stage. Therefore, power or the like required for supplying fluid to the electric heating device can be reduced.
- Advantageously, in the electric heating device, the heating element is a PTC element.
- The PTC element generates heat by energization. Upon reaching a certain temperature, the PTC element largely increases its resistance and is held at the certain temperature. Further, as the temperature increases, a value of an electric current flowing in the PTC element decreases. According to the electric heating device, therefore, an abnormal temperature increase in the heating module can be prevented. Further, power consumption required for generating heat in the heating elements can be reduced.
- Advantageously, the electric heating device includes: a first header that is provided at one end of the flow paths and supplies fluid to the flow paths; and a second header that is provided at the other end of the flow paths and collects fluid discharged from the flow paths. The first header includes a fluid supply port for supplying fluid into the first header, and the second header includes a fluid discharge port for discharging fluid to outside of the second header.
- Fluid supplied from the fluid supply port to the first header sequentially flows from a flow path close to the fluid supply port toward a flow path away from the fluid supply port. Therefore, a static pressure distribution is generated in the first header. Also in the second header, a static pressure distribution is generated because static pressure near the fluid discharge port decreases most. Due to the static pressure distribution in the headers, a magnitude of flow rate of fluid differs in each flow path. According to the electric heating device, even when there is a difference in the magnitude of flow rate in the respective flow paths due to the static pressure distribution in the headers, heating efficiency at the time of intermediate output can be improved. Further, in the electric heating device, fluid is supplied from the first header to the flow path formed of a tubular structure, for example, a tube. Fluid discharged from the flow path is collected in the second header. Therefore, leakage of fluid to outside of the flow path can be suppressed, as compared with a structure in which flow paths are formed by partitioning a casing by walls or the like.
- According to another aspect of the present invention, a vehicle air conditioner includes: a blower that takes outside air into an air flow path of an air conditioning unit and circulates air in a vehicle interior; a cooler that is arranged on a downstream side of the blower and cools outside air; and a heater that is arranged on a downstream side of the cooler and heats air cooled by the cooler. An electric heating device for heating fluid supplied to the heater is provided, and the electric heating device is the electric heating device discussed above, and includes a circulation circuit for circulating the fluid to the electric heating device.
- By applying the electric heating device according to any one of inventions described above to a vehicle air conditioner, when adjustment of temperature to approximate an intermediate temperature between heating and cooling in an intermediate period (in the spring and autumn) is required, the electric heating device according to the inventions described above provided in the vehicle air conditioner is set to intermediate output at which a part of the heating elements is energized. At this time, the electric heating device can preferentially heat a flow path having a relatively large flow rate of fluid, and thus unnecessary power consumption can be suppressed and heating efficiency can be improved. As a result of improving the heating efficiency, the flow rate that becomes a required quantity of heating can be reduced, thereby enabling to suppress driving power of a fluid supply unit that supplying fluid, such as a pump. Particularly, in a case of an electric car, power consumption of the entire car can be suppressed, thereby enabling to increase its driving efficiency.
- Advantageously, the vehicle air conditioner includes a controller that includes an in-vehicle temperature detector and instructs a predetermined output to the electric heating device according to an in-vehicle temperature detected by the in-vehicle temperature detector.
- According to the vehicle air conditioner, optimum output control of the electric heating device provided in the vehicle air conditioner according to the in-vehicle temperature is realized. Therefore, the heating efficiency of the electric heating device is further improved, and power consumption by the vehicle air conditioner can be further suppressed. Particularly, in a case of an electric car, power consumption of the entire car can be suppressed, thereby enabling to increase its driving efficiency.
- According to the electric heating device of the present invention, fluid can be heated efficiently at the time of intermediate output of the electric heating device. Further, according to the vehicle air conditioner of the present invention, at the time of intermediate output of the electric heating device, power consumption of the vehicle air conditioner can be reduced.
-
FIG. 1 is a perspective view of an overall configuration of an electric heating device according to a first embodiment. -
FIG. 2 is an exploded perspective view for explaining a configuration of the electric heating device shown inFIG. 1 . -
FIG. 3 is a sectional view for explaining a configuration of the electric heating device shown inFIGS. 1 and 2 . -
FIG. 4 is an exploded perspective view for explaining a configuration of a heating module shown inFIG. 1 . -
FIG. 5 is a conceptual diagram of a static pressure distribution in each header. -
FIG. 6 is a sectional view for explaining a verification example of the electric heating device according to the first embodiment. -
FIG. 7 depicts a flow rate of fluid flowing in respective flow paths of the electric heating device shown inFIG. 6 . -
FIG. 8 is a schematic configuration diagram of a vehicle air conditioner. - Exemplary embodiments of an electric heating device and a vehicle air conditioner according to the present invention will be explained below in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments.
-
FIG. 1 is a perspective view of an overall configuration of an electric heating device according to a first embodiment.FIG. 2 is an exploded perspective view for explaining the configuration of the electric heating device shown inFIG. 1 .FIG. 3 is a sectional view for explaining the configuration of the electric heating device shown inFIGS. 1 and 2 .FIG. 3 is a sectional view in which a surface cut along a one-dot chain line inFIG. 1 is viewed from asecond header 13 toward a direction of afirst header 11. In other words,FIG. 3 is a sectional view of acasing 9 orthogonal to a longitudinal direction of aflow path 3 as viewed from thesecond header 13 toward the direction of thefirst header 11. - As shown in
FIGS. 1 to 3 , theelectric heating device 1 according to the present embodiment includes theflow path 3 and aheating module 5.Heating elements 7 are held in theheating module 5. Theflow paths 3 and theheating modules 5 are alternately arranged in thecasing 9. In a cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, that is, inFIG. 3 , it is defined that a direction in which theflow paths 3 and theheating modules 5 are alternately arranged is a lateral direction, and a direction orthogonal to the lateral direction is a longitudinal direction, for descriptive purposes. - For example, the
flow path 3 can have a tubular structure, and it can be a tube. A plurality offlow paths 3 are provided in parallel in thecasing 9. Theflow paths 3 are arranged so that a plurality of rows are formed in the lateral direction and in the longitudinal direction. In theelectric heating device 1, theflow paths 3 are arranged in two rows in the longitudinal direction and in ten rows in the lateral direction; however, these can be appropriately changed according to a place where theelectric heating device 1 is arranged and a required output. Particularly, theflow path 3 can be arranged in one row in the longitudinal direction. - The
flow path 3 is provided such that one end face opens in thefirst header 11, and the other end face opens in thesecond header 13. That is, thefirst header 11 and thesecond header 13 are communicated with each other by theflow path 3. Thefirst header 11 includes afluid supply port 15 for introducing fluid into thefirst header 11. Thesecond header 13 includes afluid discharge port 17 for discharging fluid to outside of thesecond header 13. In theelectric heating device 1, thefluid supply port 15 and thefluid discharge port 17 open in the same direction in the lateral direction. - The
respective heating modules 5 are arranged between theflow paths 3 adjacent to each other in the lateral direction. In other words, theheating modules 5 are arranged between rows of theflow paths 3 in the lateral direction. In theelectric heating device 1, eightheating modules 5 are provided between rows of theflow paths 3 in the lateral direction; however, the number thereof can be appropriately changed according to the arrangement of theflow paths 3, the configuration of theheating module 5 or the like. Theheating module 5 includes theheating element 7, anelectrode plate 19, and an insulatingplate 21. -
FIG. 4 is an exploded perspective view for explaining the configuration of the heating module shown inFIG. 1 . Theelectrode plates 19 are provided on both sides of theheating element 7. The insulatingplates 21 are provided on the side opposite to a surface of theelectrode plate 19 in contact with theheating element 7. Theheating elements 7, theelectrode plates 19, and the insulatingplates 21 are held in aframe 23 to constitute theheating module 5. Theframe 23 is formed of a resin material having a high heat resistance, for example, polyphenylene sulfide. The insulatingplate 21 insulates between theheating module 5 and theflow path 3, and alumina (aluminum oxide, Al2O3) is used as a material therefor. The insulatingplate 21 is heat-transferably connected to theelectrode plate 19 and theflow path 3. - The
electrode plate 19 is electrically connected to asubstrate 25 shown inFIG. 3 . Theelectrode plate 19 is electrically connected to theheating element 7, so that heat transfer therebetween is possible. Theelectrode plate 19 and theheating element 7 can be bonded by using, for example, thermosetting silicon. Theelectrode plate 19 includes aprotrusion 19 a formed by protruding a part of theelectrode plate 19. Theprotrusion 19 a is connected to thesubstrate 25 provided in thecasing 9. In the lateral direction in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, therespective protrusions 19 a protruding from theadjacent heating modules 5 can be connected with each other, and theprotrusion 19 a can be connected to thesubstrate 25. - The
substrate 25 has a function of energizing theelectrode plate 19 provided in theheating module 5 via theprotrusion 19 a of theelectrode plate 19. When theelectrode plate 19 is energized, theheating element 7 provided in contact with theelectrode plate 19 is energized to generate heat. Theheating element 7 can be a PTC element, which is a positive-temperature-coefficient thermistor element. The PTC element generates heat by energization. Upon reaching a certain temperature, the PTC element largely increases its resistance, and is held at a certain temperature. Further, as the temperature increases, a value of an electric current flowing in the PTC element decreases. - A
controller 27 determines output of theelectric heating device 1 based on a detection value of the temperature or the like at a predetermined place, and transmits a control signal corresponding to the output to thesubstrate 25. The output of theelectric heating device 1 can be mainly divided into three, that is, maximum output, intermediate output, and minimum output. When theelectric heating device 1 is controlled to the maximum output, thesubstrate 25 is controlled to energize all of theelectrode plates 19. When theelectric heating device 1 is controlled to the minimum output, in other words, when the output is controlled to be zero, thesubstrate 25 is controlled to suspend energization to all of theelectrode plates 19. When theelectric heating device 1 is controlled to the intermediate output, which is in between the maximum output and the minimum output, thesubstrate 25 is controlled to energize parts of theelectrode plates 19 and suspend energization to the remainingelectrode plates 19. - An operation of the
electric heating device 1 is explained below. Fluid boosted by a fluid supply unit (not shown), for example, by a pump is supplied into thefirst header 11 via thefluid supply port 15. Fluid supplied to thefirst header 11 flows sequentially from theflow path 3 closest to thefluid supply port 15. Fluid flowing into theflow path 3 is heated by heat exchange with theheating module 5 provided adjacent to theflow path 3 and flows out to thesecond header 13. Fluid flowing out to thesecond header 13 is discharged to outside of thesecond header 13 via thefluid discharge port 17. - At this time, a quantity of heat that can be given to fluid flowing in the
adjacent flow path 3 by theheating module 5 can be indicated by thefollowing equation 1. -
Q=k·A·(T p −T w) -
K∝QS (Equation 1) - In the equation, Q denotes a quantity of heat given to fluid by the
heating module 5, k denotes an overall heat transfer coefficient indicating thermal conductivity, A denotes a heat transmission area, Tp denotes a surface temperature of theheating element 7, Tw denotes a temperature of fluid, and QS denotes a flow rate of fluid in theflow path 3. The overall heat transfer coefficient k and the flow rate QS of fluid are substantially in a proportional relation, and when QS increases, k also increases. In theelectric heating device 1, the heat transmission area A is constant, and the temperature Tw of fluid is constant. - At the time of intermediate output of the
electric heating device 1, theheating element 7 held by a part of theheating module 5 is energized by thesubstrate 25 via theelectrode plate 19. When it is assumed that the temperature of theheating element 7 at the time of energization is constant, the quantity of heat Q given to fluid by theheating module 5 increases, as the flow rate QS increases. Theelectric heating device 1 preferentially selects and energizes a heating element held by theheating module 5 provided adjacent to theflow path 3 having a relatively large flow rate of fluid. - The flow rate of fluid in the
respective flow paths 3 is explained here.FIG. 5 is a conceptual diagram of a static pressure distribution in the header. Static pressure inside thefirst header 11 or inside thesecond header 13 is plotted on a Y-axis inFIG. 5 . A position in thefirst header 11 or thesecond header 13 is plotted on an X-axis inFIG. 5 . In other words, the X-axis shows a distance from the end of thefirst header 11 on thefluid supply port 15 side or a distance from the end of thesecond header 13 on thefluid discharge port 17 side. - As described above, the fluid having flown into the
first header 11 from thefluid supply port 15 flows sequentially from theflow path 3 closest to thefluid supply port 15 toward theflow path 3 away from thefluid supply port 15. Therefore, in thefirst header 11, the flow rate of fluid decreases as moving away from thefluid supply port 15 and flow velocity becomes slow. Along with this, as shown inFIG. 5 , the static pressure in thefirst header 11 increases as moving away from thefluid supply port 15. On the other hand, in thesecond header 13, the flow rate of fluid increases as approaching thefluid discharge port 17 and the static pressure decreases as shown inFIG. 5 . - The flow rate of fluid in the
respective flow paths 3 is determined based on a static pressure difference ΔP between thefirst header 11 and thesecond header 13 where theflow path 3 is located. That is, the flow rate of fluid flowing in theflow path 3 increases, as the static pressure difference ΔP between thefirst header 11 and thesecond header 13 increases. According toFIG. 5 , when the static pressure difference ΔP is explained by using thefirst header 11, the static pressure difference ΔP decreases from the end of thefirst header 11 on thefluid supply port 15 side toward a central part of thefirst header 11. Further, the static pressure difference ΔP increases from the central part of thefirst header 11 toward the end of thefirst header 11 on a side opposite to thefluid supply port 15. Accordingly, in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, the flow rate of fluid in theflow path 3 positioned in the central part in the lateral direction becomes the smallest, and the flow rate thereof in theflow path 3 positioned on the opposite ends in the lateral direction increases. - That is, at the time of intermediate output of the
electric heating device 1, in the lateral direction in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, theheating element 7 held by theheating module 5 adjacent to theflow path 3 positioned on the outermost side is preferentially selected and energized. - According to the
electric heating device 1, at the time of intermediate output, theflow path 3 having a relatively large flow rate of fluid, of theflow paths 3, can be preferentially selected and heated. That is, in the lateral direction in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, theflow path 3 on the outermost side can be preferentially selected and heated. The quantity of the heat Q that can be given to fluid by theheating module 5 increases as the flow rate QS of fluid flowing in theflow path 3 increases. Therefore, when theelectric heating device 1 is used, heating efficiency at the time of intermediate output can be improved. - Accordingly, because a predetermined quantity of heat can be acquired promptly, supply of fluid to the
electric heating device 1 can be suspended at an early stage. Therefore, power or the like required for supplying fluid to theelectric heating device 1 can be reduced. When the flow rate of fluid to be supplied to theelectric heating device 1 is adjusted according to the quantity of heat required for the desired output, the flow rate of fluid at the time of intermediate output can be decreased. Also with this configuration, power or the like required for supplying fluid to theelectric heating device 1 can be reduced. - Further, the
electric heating device 1 includes thefirst header 11 and thesecond header 13. Theflow path 3 is for example, a tubular structure such as a tube, and the end face thereof opens in thefirst header 11 and thesecond header 13. Because fluid heated by heat exchange with theheating module 5 flows in theflow path 3, leakage of fluid to outside of the flow path can be suppressed, as compared with a structure in which theflow path 3 is formed by partitioning thecasing 9 by walls or the like. - In the
electric heating device 1, a difference occurs in the flow rate in theflow path 3 due to provision of thefirst header 11 and thesecond header 13. However, even in the case that theelectric heating device 1 does not include thefirst header 11 and thesecond header 13, when a plurality of flow paths are provided in the casing, a difference in the flow rate of fluid between the respective flow paths occurs at least occasionally. In such a case, therefore, theheating module 5 provided adjacent to the flow path and having a relatively large flow rate of fluid is preferentially selected at the time of intermediate output of the electric heating device, so that theheating elements 7 held by theheating module 5 generate heat, thereby enabling to improve the heating efficiency at the time of intermediate output. - An electric heater or the like can be used as the
heating element 7 in theelectric heating device 1; however, it is desired to use the PTC element, which is the positive-temperature-coefficient thermistor element. The PTC element generates heat by energization. Upon reaching a certain temperature, the PTC element largely increases its resistance, and is held at the certain temperature. Further, as the temperature increases a value of an electric current flowing in the PTC element decreases. Accordingly, by using the PTC element as theheating element 7, abnormal temperature rise in theheating module 5 in theelectric heating device 1 can be prevented. Further, consumed power can be reduced, and power consumption required for heat generation of theheating element 7 can be also reduced. -
FIG. 6 is a sectional view for explaining a verification example of the electric heating device according to the first embodiment. Similarly toFIG. 3 ,FIG. 6 is a sectional view in which a surface cut along the one-dot chain line inFIG. 1 is viewed from thesecond header 13 toward a direction of thefirst header 11. In other words,FIG. 6 is a sectional view of thecasing 9 orthogonal to the longitudinal direction of theflow path 3 as viewed from thesecond header 13 toward the direction of thefirst header 11. Like reference numerals refer to like members as those in theelectric heating device 1, and redundant explanations thereof will be omitted. In anelectric heating device 101 according to the verification example, in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, theflow paths 3 are arranged in two rows in the longitudinal direction and nine rows in the lateral direction. As shown inFIG. 6 , when these are explained individually, theflow paths 3 are referred to, respectively, as aflow path 3A to a flow path 3I (an upper stage), and as aflow path 3 a to aflow path 3 i (a lower stage). In theelectric heating device 101, eightheating modules 5 are arranged between rows of theflow paths 3 in the lateral direction. - The
electrode plate 19 held by theheating module 5 includes theprotrusion 19 a formed by protruding a part of theelectrode plate 19. In the lateral direction in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3, theprotrusions 19 a of theadjacent heating modules 5 are connected to each other. Accordingly, an energizing system 127 formed of twoheating modules 5 is configured. In theelectric heating device 101, four energizing systems are provided, and as shown inFIG. 6 , when these are explained individually, the energizing systems 127 are referred to as energizingsystems protrusions 19 a of the twoheating modules 5 connected to each other are respectively connected to thesubstrate 25 provided in thecasing 9. - The flow rate of fluid in the
respective flow paths 3 when fluid flows in theflow path 3 in theelectric heating device 101 is explained.FIG. 7 depicts a flow rate of fluid flowing in the respective flow paths of the electric heating device shown inFIG. 6 . InFIG. 7 , a flow rate of fluid flowing in therespective flow paths 3 is plotted on the Y-axis, and the flow path number of theflow paths 3, in other words, a position of each of theflow paths 3 is plotted on the X-axis. The values shown inFIG. 7 are acquired based on a flow analysis of fluid flowing in theflow paths 3 using a computer. - As viewed in
FIG. 7 , it is understood that the flow rate of theflow path 3 in outside rows is relatively large in the lateral direction in the cross-sectional surface of thecasing 9 orthogonal to the longitudinal direction of theflow path 3. Specifically, the total flow rate of theflow paths 3I and 3 i is the largest, and then the total flow rate of theflow paths flow paths flow paths flow paths 3 occurs due to a static pressure difference of fluid flowing in thefirst header 11 and thesecond header 13. - In the
electric heating device 101, at the time of intermediate output, theheating element 7 held by theheating module 5 adjacent to theflow path 3 having a relatively large flow rate of fluid is preferentially energized. Specifically, the energizingsystem 127 d formed of theheating module 5 that can heat theflow paths flow paths substrate 25. The energizingsystem 127 a is then preferentially energized, followed by the energizingsystem 127 c. The number of systems to be energized is appropriately determined based on the output acquired by theelectric heating device 101. Accordingly, for example, when two systems are to be energized, the energizingsystems 127 a andt 127 d are energized. When three systems are to be energized, energization is performed with respect to the energizingsystems - In the verification example, the energizing system 127 is formed by connecting the
protrusions 19 a of theelectrode plates 19 of twoheating modules 5 with each other. However, like in theelectric heating device 1, one energizing system can be formed of oneheating module 5. In this case, the flow path to be heated can be finely selected as compared with a case that the one energizing system 127 is formed of twoheating devices 7. On the other hand, like in theelectric heating device 101, whenplural heating modules 5 constitute the energizing system 127, the number of wiring connections from a power supply unit (not shown) can be less than the number of connections to therespective heating modules 5. Accordingly, in theelectric heating device 101, weight reduction and space saving are realized. Further, the above configuration contributes to reduction of man-hour at the time of assembling theelectric heating device 101. -
FIG. 8 is a schematic configuration diagram of a vehicle air conditioner. Avehicle air conditioner 201 according to a second embodiment of the present invention includes acasing 202 that forms anair flow path 202A for taking outside air or air in vehicle interior to adjust the temperature thereof and leads the air to the vehicle interior. In thevehicle air conditioner 201, as an example, theelectric heating device 101 according to the above embodiment shown inFIG. 6 is applied. The detailed configuration of theelectric heating device 101 is as described above, and explanations thereof will be omitted. - A
blower 203, a cooler 204, aheater 205, which is an air conditioning heat exchange unit, and anair mix damper 206 are provided in thecasing 202. Atank 207, apump 208, and theelectric heating device 101 according to the verification example described above are provided outside of thecasing 202. Thetank 207, thepump 208, theelectric heating device 101, and theheater 205 constitute afluid circulation route 209 in which fluid, which is a heating medium, circulates. - The
blower 203 sucks outside air or air in the vehicle interior to increase pressure, and feeds air to a downstream side of theblower 203 in theair flow path 202A. The cooler 204 cools air fed from theblower 203. The cooler 204 includes an expansion valve, an evaporator or the like, to cool air passing through the cooler 204 by heat of vaporization generated when a refrigerant circulating therein evaporates. - The
heater 205 heats air passing through the cooler 204 and cooled. A flow path in which fluid heated by theelectric heating device 101 flows and a flow path in which air passes are provided inside theheater 205. Air is heated by heat exchange between fluid heated by theelectric heating device 101 and air passing through theheater 205. - The
air mix damper 206 adjusts a rate between a quantity of air that passes through theheater 205 and a quantity of air that flows bypassing theheater 205, to adjust a temperature of air mixed on the downstream side thereof. When heating is not required, the entire air is caused to bypass theheater 205 to reduce a pressure loss. - The
tank 207 temporarily holds a part of the heating medium that circulates in thefluid circulation route 209. Thetank 207 is arranged between theheater 205 and thepump 208 in thefluid circulation route 209. Thepump 208 compresses fluid and supplies the fluid to theelectric heating device 101. Thepump 208 is arranged between thetank 207 and theelectric heating device 101 in thefluid circulation route 209. - The downstream side of the
casing 202 is connected to a plurality of vents that blow the temperature-adjusted air into the vehicle interior via a blowing-mode switching damper and duct. - As shown in
FIG. 6 , in theelectric heating device 101 according to the present embodiment, four energizingsystems substrate 25, and heating capacity thereof is controlled in three output stages, which are maximum output, minimum output (zero output), and intermediate output. Control is performed such that at the time of maximum output, all four systems are energized, at the time of minimum output, energization to all four systems are suspended, and at the time of intermediate output, only two systems are energized. Under such control, for example, a temperature sensor (not shown) provided in the vehicle interior detects the temperature in the vehicle interior and outputs a switching instruction from thecontroller 27 based on a detection value thereof to switch between the three stages. - At the time of heating the vehicle interior (in the winter), all four systems are energized, and fluid in the
flow path 3 is heated by therespective heating modules 5. Heated fluid is fed to theheater 205 and heat-exchanged with air in thevehicle air conditioner 201, and the heated air is blown into the vehicle interior. Accordingly, heating is efficiently performed in a short time. On the other hand, at the time of cooling the vehicle interior (in the summer), because energization with respect to all four systems is suspended, fluid in theflow path 3 is not heated. At this time, because fluid does not need to be supplied to theelectric heating device 101, thepump 208 is also suspended, thereby suppressing the power consumption. - Further, during an intermediate period (in the spring and autumn), by a train crew, adjustment of temperature can be required to adjust a set temperature in the vehicle interior to an intermediate one in between heating and cooling. That is, hot air and cold air are mixed substantially at a 50:50 ratio and adjusted, and the temperature-adjusted air is blown into the vehicle interior. When a predetermined temperature value is detected by the temperature sensor installed in the vehicle interior, the
controller 27 transmits an instruction value of intermediate output to theelectric heating device 101, and two systems are energized to heat fluid. - At this time, as explained with reference to
FIG. 7 , it has been already ascertained that there is a difference in the flow rate of fluid flowing in therespective flow paths 3 in theelectric heating device 101 due to the static pressure difference ΔP. Therefore, at the time of energizing the two systems, when theflow paths flow paths systems flow paths - The flow rate of fluid can be also reduced to acquire a required quantity of heating, and power required to drive the pump for supplying fluid to the
electric heating device 101 can be reduced. That is, a time (a flow rate) required for feeding fluid to acquire the required quantity of heating can be reduced, thereby reducing driving power of the pump. When the air conditioner according to the present embodiment is applied to an electric car, power consumption of the entire car can be reduced, thereby enabling efficient driving. - According to the
vehicle air conditioner 201, because theelectric heating device 101 according to the first embodiment is used for heating fluid, which is a heating medium, power used for air conditioning in the vehicle interior can be reduced. As described above, theelectric heating device 101 has high heating efficiency at the time of intermediate output. Accordingly, at the time of intermediate output of theelectric heating device 101, the flow rate of fluid circulated by thepump 208 can be reduced, and power consumed for driving thepump 208 can be also reduced. In thevehicle air conditioner 201, theelectric heating device 101 according to the verification example is used; however, theelectric heating device 1 can be also used. - As described above, the electric heating device according to the present invention is useful for efficiently heating fluid flowing in the device at the time of intermediate output, and particularly suitable to be used as a heat source of an electric car or the like in which waste heat of an engine cannot be used as a heat source of a heating unit. Furthermore, the vehicle air conditioner according to the present invention is useful for decreasing the power to be used for air-conditioning in a vehicle interior.
-
- 1, 101 electric heating device
- 3 flow path
- 5 heating module
- 7 heating element
- 9 casing
- 11 first header
- 13 second header
- 15 fluid supply port
- 17 fluid discharge port
- 19 electrode plate
- 21 insulating plate
- 23 frame
- 25 substrate
- 27 controller
- 127 energizing system
- 201 vehicle air conditioner
- 202 casing
- 202A air flow path
- 203 blower
- 204 cooler
- 205 heater
- 206 air mix damper
- 207 tank
- 208 pump
- 209 fluid circulation route
Claims (5)
1. An electric heating device comprising:
a plurality of flow paths in which fluid flows; and
a plurality of heating modules arranged adjacent to the flow paths and including heating elements that generate heat by energization, wherein
at a time of intermediate output, the heating element in the heating module provided adjacent to a flow path among the plurality of flow paths having a relatively large flow rate of fluid is energized.
2. The electric heating device of claim 1 , wherein the heating element is a PTC element.
3. The electric heating device of claim 1 , comprising:
a first header that is provided at one end of the flow paths and supplies fluid to the flow paths; and
a second header that is provided at the other end of the flow paths and collects fluid discharged from the flow paths, wherein
the first header includes a fluid supply port for supplying fluid into the first header, and
the second header includes a fluid discharge port for discharging fluid to outside of the second header.
4. A vehicle air conditioner comprising:
a blower that takes outside air into an air flow path of an air conditioning unit and circulates air in a vehicle interior;
a cooler that is arranged on a downstream side of the blower and cools outside air; and
a heater that is arranged on a downstream side of the cooler and heats air cooled by the cooler, wherein
an electric heating device for heating fluid supplied to the heater is provided, and
the electric heating device is the electric heating device of any one of claim 1 , and includes a circulation circuit for circulating the fluid to the electric heating device.
5. The vehicle air conditioner of claim. 4, comprising a controller that includes an in-vehicle temperature detector and instructs a predetermined output to the electric heating device according to an in-vehicle temperature detected by the in-vehicle temperature detector.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-017432 | 2010-01-28 | ||
JP2010017432A JP2011152907A (en) | 2010-01-28 | 2010-01-28 | Electric heating system and vehicular air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110180617A1 true US20110180617A1 (en) | 2011-07-28 |
Family
ID=43920945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/912,319 Abandoned US20110180617A1 (en) | 2010-01-28 | 2010-10-26 | Electric heating device and vehicle air conditioner |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110180617A1 (en) |
EP (1) | EP2353898B1 (en) |
JP (1) | JP2011152907A (en) |
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US20130243411A1 (en) * | 2011-04-07 | 2013-09-19 | Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd. | Heat medium heating unit and vehicle air conditioning apparatus provided with the same |
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US20150043899A1 (en) * | 2012-03-28 | 2015-02-12 | Valeo Systemes Thermiques | Electrical Heating Device For A Motor Vehicle, And Associated Heating, Ventilation And/Or Air Conditioning Apparatus |
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US20150251519A1 (en) * | 2012-09-28 | 2015-09-10 | Valeo Systemes Thermiques | Device For Thermally Conditioning Fluid For A Motor Vehicle And Corresponding Heating And/Or Air Conditioning Apparatus |
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US11760165B2 (en) * | 2019-04-08 | 2023-09-19 | Borgwarner Emissions Systems Spain, S.L.U. | Heating device for use thereof in a vehicle |
USD905834S1 (en) * | 2019-06-24 | 2020-12-22 | Zhongshan Chongde Electric Appliance Industry Co., Ltd. | Water heater |
Also Published As
Publication number | Publication date |
---|---|
EP2353898A1 (en) | 2011-08-10 |
EP2353898B1 (en) | 2013-05-15 |
JP2011152907A (en) | 2011-08-11 |
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Legal Events
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AS | Assignment |
Owner name: MITSUBISHI HEAVY INDUSTRIES, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SAITO, KATSUHIRO;SUETAKE, HIDEKI;IRITANI, YOICHIRO;AND OTHERS;REEL/FRAME:025209/0975 Effective date: 20101015 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |