EP1706675B1 - Portable air conditioner - Google Patents
Portable air conditioner Download PDFInfo
- Publication number
- EP1706675B1 EP1706675B1 EP03781045A EP03781045A EP1706675B1 EP 1706675 B1 EP1706675 B1 EP 1706675B1 EP 03781045 A EP03781045 A EP 03781045A EP 03781045 A EP03781045 A EP 03781045A EP 1706675 B1 EP1706675 B1 EP 1706675B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation
- air conditioner
- heat absorption
- unit
- portable air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005855 radiation Effects 0.000 claims abstract description 155
- 238000010521 absorption reaction Methods 0.000 claims abstract description 87
- 238000001816 cooling Methods 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000007664 blowing Methods 0.000 claims description 29
- 239000004065 semiconductor Substances 0.000 claims description 29
- 239000007921 spray Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 7
- 239000003507 refrigerant Substances 0.000 description 31
- 238000005192 partition Methods 0.000 description 5
- 230000005679 Peltier effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0042—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater characterised by the application of thermo-electric units or the Peltier effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
- F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
- F25B2321/021—Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
- F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
- F25B2321/025—Removal of heat
- F25B2321/0251—Removal of heat by a gas
Definitions
- the present invention relates to a portable air conditioner, and more particularly to, a portable air conditioner which can individually provide a cool air current to each user and which can be easily moved due to a small size.
- an air conditioner pleasantly cools an indoor space such as a residential area, restaurant or office by using a refrigerating cycle.
- the operation of the conventional air conditioner using the refrigerating cycle will now be explained with reference to Fig. 1.
- the conventional air conditioner using the refrigerating cycle includes a compressor 2 for compressing refrigerants into high temperature high pressure gas refrigerants, a condenser 4 for condensing the refrigerants from the compressor 2 into high temperature high pressure liquid refrigerants, an expansion means 6 for decompressing the refrigerants from the condenser 4 into low temperature low pressure refrigerants, such as a capillary tube or electronic expansion valve, and an evaporator 8 for evaporating the refrigerants from the expansion means 6 into low temperature low pressure gas refrigerants.
- the aforementioned elements are connected to each other through refrigerant pipe lines.
- an outdoor air blowing means having a radiation fan 12 and a motor (not shown) for forcibly blowing outdoor air to the condenser 4 and disposed in one side of the condenser 4, and an indoor air blowing means (not shown) having a cooling fan 14 and a motor (not shown) for forcibly blowing indoor air to the evaporator 8 and disposed in one side of the evaporator 8.
- the refrigerants passing through the condenser 4 are heat-exchanged with outdoor air and condensed, and the refrigerants passing through the evaporator 8 are heat-exchanged with indoor air and evaporated, to cool indoor air.
- the operations of the motors for driving the compressor 2, the radiation fan 12 and the cooling fan 14 are controlled by a control unit (not shown). According to a size of the indoor space to be cooled, each capacity of the compressor 2, the radiation fan 12 and the cooling fan 14 is determined and the operations thereof are controlled by the control unit.
- the compressor 2, the condenser 4, the expansion means 6, the evaporator 8, the outdoor air blowing means and the indoor air blowing means are incorporated into one unit and fixed to a wall or window, or the compressor 2, the condenser 4, the expansion means 6 and the outdoor air blowing means are incorporated into one outdoor unit and fixed to the outdoor space, and the evaporator 8 and the indoor air blowing means are incorporated into one indoor unit and fixed to the indoor space.
- the compressor 2 is operated to circulate the refrigerants through the refrigerating cycle, and the radiation fan 12 and the cooling fan 14 are driven to forcibly blow outdoor air and indoor air to the condenser 4 and the evaporator 8, respectively.
- the refrigerants are compressed into high temperature high pressure gas refrigerants.
- the refrigerants passing through the compressor 2 are heat-exchanged with outdoor air and condensed into high temperature high pressure liquid refrigerants through the condenser 4.
- the refrigerants passing through the condenser 4 are expanded and decompressed into low temperature low pressure refrigerants through the expansion means 6.
- the refrigerants passing through the expansion means 6 are heat-exchanged with indoor air and evaporated into low temperature low pressure gas refrigerants through the evaporator 8, thereby cooling indoor air.
- the compressor and the refrigerant pipe lines in which the high pressure refrigerants are circulated require high pressure resistance. Accordingly, a weight and size of the compressor and the refrigerant pipe lines increase. Moreover, the elements are connected to each other through the refrigerant pipe lines, and thus not easily installed or moved. When the user moves to a different space, the cooling effects are useless.
- the compressor In the conventional air conditioner, the compressor is connected to the other elements through the refrigerant pipe lines, and thus vibrations and noises of the compressor are transmitted to the indoor space, which may irritate the users. Freon-based refrigerants of the air conditioner cause environmental pollution.
- the conventional air conditioner cools the whole indoor space, and thus fails to satisfy all the users in the space. Furthermore, the air conditioner cools the part of the indoor space in which any of the users does not stay, which reduces cooling efficiency
- UK patent application GB 2 267 338 discloses a device for thermoelectic air conditioning using a semiconductor thermoelectric cooler based on the Peltier effect and thereby eliminates the problem of noisy operation since no compressor is used.
- thermoelectric module having a heat absorption unit for absorbing peripheral heat and a radiation unit for radiating heat to the periphery and performing heat absorption and radiation at the same time when receiving electric current.
- an air blowing means is installed near the heat absorption unit for blowing air to exchange heat between the heat absorption unit and the air and a radiation means is installed near the radiation unit for cooling the radiation unit.
- the system also includes a control unit for controlling the thermoelectric module, the air blowing means and the radiation means.
- An object of the present invention is to provide a portable air conditioner, which despite being small and light for the user to use when he/she moves, has increased cooling efficiency.
- Another object of the present invention is to provide a portable air conditioner which can guarantee a pleasant environment by preventing noises and vibrations and removing refrigerants.
- Yet another object of the present invention is to provide a portable air conditioner which can improve users' satisfaction by controlling cooling for each user.
- a portable air conditioner including: a thermoelectric module having a heat absorption unit for absorbing peripheral heat and a radiation unit for radiating heat to the periphery in the facing portions, and performing heat absorption and radiation at the same time when receiving electric current; an air blowing means installed near the heat absorption unit, for blowing air to exchange heat between the heat absorption unit and the air, a radiation means installed near the radiation unit, for cooling the radiation unit; and a control unit for controlling the thermoelectric module, the air blowing means and the radiation means.
- the radiation means comprises a spray nozzle for spraying water to the radiation unit so that water sprayed from the spray nozzle to the radiation unit can be evaporatated to cool the radiation unit.
- thermoelectric module includes P-type semiconductors and N-type semiconductors in pairs, and the heat absorption unit and the radiation unit are formed in both ends of the P-type semiconductors and the N-type semiconductors.
- thermoelectric modules are connected in series.
- a plurality of heat absorption fins are installed in the heat absorption unit, and a plurality of radiation fins are installed in the radiation unit, for widening a heat transfer area.
- the air blowing means includes a heat absorption passage guide having a suction hole and a discharge hole for sucking and discharging air, having the heat absorption unit or heat absorption fins built in between the suction hole and the discharge hole, and guiding air, and a cooling fan and a motor installed inside the heat absorption passage guide, for blowing air along the heat absorption passage guide.
- the suction hole is formed in the lower portion
- the discharge hole is formed in the upper portion
- the cooling fan is installed inside the discharge hole.
- the cooling fan is a cross flow fan.
- the radiation means includes a radiation fan and a motor for blowing air to the radiation unit, so that water sprayed from the spray nozzle to the radiation unit can be evaporated to cool the radiation unit.
- the radiation means further includes a radiation passage guide having a suction hole and a discharge hole for sucking and discharging air, having the radiation unit built in between the suction hole and the discharge hole, and guiding air.
- a radiation passage guide having a suction hole and a discharge hole for sucking and discharging air, having the radiation unit built in between the suction hole and the discharge hole, and guiding air.
- the suction hole is formed in the upper portion, the discharge hole is formed in the lower portion, and the radiation fan is installed inside the suction hole.
- the radiation means further includes a water storage tank installed in the lower portion of the radiation passage guide, for collecting water sprayed from the spray nozzle and storing water, and a pump for pumping water stored in the water storage tank to the spray nozzle.
- a water storage tank installed in the lower portion of the radiation passage guide, for collecting water sprayed from the spray nozzle and storing water, and a pump for pumping water stored in the water storage tank to the spray nozzle.
- the spray nozzle is installed inside the suction hole of the radiation passage guide, for spraying water from the upper portion of the radiation unit.
- Fig. 2 is a structure view illustrating a portable air conditioner in accordance with the p resent invention
- a nd Fig. 3 is a side-sectional view illustrating major elements of the portable air conditioner in accordance with the present invention.
- the portable air conditioner includes a thermoelectric module 50 having a heat absorption unit 52 and a radiation unit 54 in the facing portions, and performing heat absorption for absorbing peripheral heat in the heat absorption unit 52 and radiation for radiating heat to the periphery in the radiation unit 54 at the same time when receiving electric current, an air blowing means 60 installed near the heat absorption unit 52, for blowing air to the heat absorption unit 52 to exchange heat between the heat absorption unit 52 and the air, a radiation means 70 installed near the radiation unit 54, for spaying water to the radiation unit 54 for evaporation and cooling, and a control unit 80 for controlling the thermoelectric module 50, the air blowing means 60 and the radiation means 70.
- thermoelectric module 50 is a chip-type electronic cooling material using a thermoelectric semiconductor which is an energy conversion material as a basic material.
- the thermoelectric module 50 is comprised of P-type semiconductors P having deficient electrons and N-type semiconductors N having excessive electrons in pairs.
- the plurality of P-type semiconductors P and the plurality of N-type semiconductors N are installed to have their one side ends alternately electrically connected in series by a metal electrode. When receiving a DC voltage, electrons move heat to the same direction In the different semiconductors.
- the heat absorption unit 52 for performing heat absorption is formed in one side ends of the P-type semiconductors P and the N-type semiconductors N, and the radiation unit 54 for performing radiation is formed in the other side ends thereof.
- heat transfer plates 52a and 54a for directly transferring heat to both ends of the P-type semiconductors P and the N-type semiconductors N, such as ceramics are connected to the thermoelectric module 50.
- a plurality of heat absorption fins 52b for widening a heat absorption area are formed on the heat transfer plate (heat absorption plate 52a) of the heat absorption unit 52, and a plurality of radiation fins 54b for widening a radiation area are formed on the heat transfer plate (radiation plate 54a) of the radiation unit 54.
- the electrodes for connecting the P-type semiconductors P a nd the N -type semiconductors N are fixed to the heat transfer plates 52a and 54a by soldering, etc.
- thermoelectric module 50 an insulating wall 56 is partially inserted between the heat absorption unit 52 and the radiation unit 54, and the P-type semiconductors P and the N-type semiconductors N are built in a partition wall 57.
- the insulating wall 56 delays transferring heat from the radiation unit 54 to the heat absorption unit 52 by conduction, and the partition wall 57 partitions the spaces of the heat absorption unit 52 and the radiation unit 54 and prevents heat transfer of air flowing through each space by convection, thereby improving heat exchange efficiency.
- a DC power supply 58 is connected to the metal electrode, for supplying a set voltage.
- the set voltage must be determined to improve cooling performance. That is, when the set voltage is supplied to the thermoelectric module 50, the set voltage must lower a temperature of the heat absorption unit 52 below a predetermined value and prevent a temperature of the radiation unit 54 from increasing over a predetermined value.
- thermoelectric module 50 employs the Peltier effect discovered by the French physicist Athahase Peltier (1785-1845). According to the Peltier effect, when a loop is formed by using two kinds of metals, if electric current is applied to the middle of the loop, one junction generates heat and the other junction absorbs heat.
- the air blowing means 60 includes a heat absorption passage guide 62 fixedly installed in one side of the partition wall 57 to have the heat absorption plate 52a and the heat absorption fins 52b of the heat absorption unit 52 built in, for forming a passage for flowing air between a suction hote 62a and a discharge hole 62b, and a cooling fan 64 and a motor (not shown) installed inside the heat absorption passage guide 62, for blowing air along the heat absorption passage guide 62.
- the suction hole 62a is formed in the lower portion so that relatively light hot air can be sucked from the lower portion, upwardly transferred and actively heat-exchanged with the heat absorption plate 52a and the heat absorption fins 52b, and the discharge hole 62b is formed in the upper portion so that heat-exchanged and thus relatively heavy cool air can be discharged from the upper portion and easily downwardly transferred.
- the passage between the suction hole 62a and the discharge hole 62b is vertically formed to minimize flow loss of air.
- the cooling fan 64 and the motor are installed inside the discharge hole 62b and controlled by the control unit 80, to increase a volume of cool air discharged to the user. More preferably, the cooling fan 64 is a cross flow fan for increasing an air volume and decreasing noises.
- a flow meter 66 and a psychrometer 68 are connected near the discharge hole 62b of the heat absorption passage guide 62, for measuring a volume, temperature and humidity of cool air discharged to the user.
- the control unit 80 controls the whole elements according to the data.
- the radiation means 70 includes a radiation passage guide 72 fixedly installed in the other side of the partition wall 57 to have the radiation plate 54a and the radiation fins 54b of the radiation unit 54 built in, for forming a passage for flowing air between a suction hole 72a and a discharge hole (not shown), a spray nozzle 74 for spraying water to the radiation plate 54a and the radiation fins 54b, and a radiation fan 76 and a motor (not shown) for blowing air to the radiation plate 54a and the radiation fins 54b, so that water sprayed from the spray nozzle 74 to the radiation plate 54a and the radiation fins 54b can be evaporated to cool the radiation plate 54a and the radiation fins 54b.
- the suction hole 72a is formed in the upper portion
- the discharge hole is formed in the lower portion
- the radiation fan 76 and the motor are installed inside the suction hole 72a
- the spray nozzle 74 is installed in the lower portion of the radiation fan 76 and the motor so that water can be sprayed from the upper portion of the radiation plate 54a and the radiation fins 54b.
- a hole 74h for spraying water is installed toward the upper portion of the radiation plate 54a and the radiation fins 54b.
- the operations of the radiation fan 76 and the motor are controlled by the control unit 80.
- the radiation fan 76 is a cross flow fan for increasing an air volume and decreasing noises.
- the radiation means 70 further includes a water storage tank 77 installed in the lower portion of the radiation passage guide 72, for collecting and storing water sprayed from the spray nozzle 74, and a pump 78 for pumping water stored in the water storage tank 77 to the spray nozzle 74.
- the operation of the pump 78 is also controlled by the control unit 80.
- the control unit 80 is divided into a data input unit 82 for acquiring volume, temperature and humidity data of cool air discharged to the discharge hole 62b of the heat absorption passage guide 62, and an operation control unit 84 connected to the data input unit 82, for comparing the data with user-set values or previously-stored reference values to control the operations of the elements.
- the control unit 80 controls a DC voltage inputted to the motors for driving the cooling fan 64 and the radiation fan 76, or a DC voltage inputted to the pump 78.
- the control unit 80 controls the DC voltages inputted to each element in consideration of a cooling quantity Q c and a performance factor COP.
- thermoelectric module 50 can be connected directly to the DC power supply 58, for receiving the set voltage. It is also possible to control a size of the voltage from the DC power supply 58 by the control unit 80 and then input the controlled voltage to the thermoelectric module 50.
- the cooling quantity Q c is a heat quantity absorbed by the heat absorption unit 52 of the thermoelectric module 50, and represented by the following Formula 1, and the performance factor COP is a rate of the cooling quantity Q c to power inputted to the thermoelectric module 50, the cooling fan 64, the radiation fan 76 and the pump 78, and represented by the following Formula 2:
- Q c m C p ⁇ ⁇ T
- Q c denotes a cooling quantity
- m denotes a discharge of cool air
- C p denotes a specific heat of air
- ⁇ T denotes a temperature difference of air before/after passing through the heat absorption unit 52 of the thermoelectric module 50.
- COP Q c W t + W p + W f ⁇ 1 + W f ⁇ 2
- COP denotes a performance factor
- Q c denotes a cooling quantity of the above Formula 1
- W t , W p , W f1 and W f2 denote power supplied to the thermoelectric module 50, the pump 78, the cooling fan 64 and the radiation fan 76, respectively.
- the control unit 80 raises the DC voltages supplied to the cooling fan 64, the radiation fan 76 and the pump 78 in order to improve heat exchange by increasing a volume of air and sprayed water, and in consideration of both the cooling quantity Q c and the performance factor COP, the control unit 80 inputs the optimum DC voltages to each element in order to obtain the appropriate cooling quantity Q c , reduce the power inputted to each element and obtain the cooling quantity Q c over a predetermined value.
- Fig. 4 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the thermoelectric module, when the portable air conditioner is operated in the optimum state in accordance with the present invention
- Fig. 5 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the pump, when the portable air conditioner is operated in the optimum state in accordance with the present invention
- Fig. 6 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the cooling fan, when the portable air conditioner is operated in the optimum state in accordance with the present invention
- Fig. 7 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the radiation fan, when the portable air conditioner is operated in the optimum state in accordance with the present invention.
- the portable air conditioner is operated in the optimum state by changing the voltage V t inputted to the thermoelectric module 50, as shown in Fig. 4, when the voltage V t inputted to the thermoelectric module 50 ranges from 15 to 20V, the cooling quantity Q c and the performance factor COP are high and have the optimum values in 18V.
- thermoelectric module 50 When the voltage V t inputted to the thermoelectric module 50 is too low, the heat absorption unit 52 is rarely maintained below a set temperature, and thus the cooling quantity Q c and the performance factor COP have low values. When the voltage V t inputted to the thermoelectric module 50 is too high, the radiation unit 54 is overheated to transfer heat to the heat absorption unit 52 by conduction, and thus the cooling quantity Q c and the performance factor COP have low values. Accordingly, it is preferable to control the voltage V t inputted to the thermoelectric module 50 within an appropriate voltage range.
- the voltage V t inputted to the thermoelectric module 50 is controlled to have the highest value within the voltage range for preventing heat transfer from the radiation unit 54 to the heat absorption unit 52 by conduction during the operation of the thermoelectric module 50.
- the portable air conditioner is operated in the optimum state by changing the voltage V p inputted to the pump 78, as shown In Fig. 5, when the voltage V p inputted to the pump 78 ranges from 6 to 9V, the cooling quantity Q c and the performance factor COP are high and have the optimum values in 6V.
- the cooling quantity Q c has the highest value.
- the performance factor COP increases. Therefore, it is also preferable to control the voltage V p inputted to the pump 78 within an appropriate voltage range.
- the voltage V p inputted to the pump 78 is controlled within the appropriate range determined according to the size of the thermoelectric module 50 and the number of the spray nozzles 74.
- the portable air conditioner is operated in the optimum state by changing the voltage V f1 inputted to the cooling fan 64, as shown in Fig. 6, when the voltage V f1 inputted to the cooling fan 64 ranges from 23 to 24V, the cooling quantity Q c and the performance factor COP are high and have the optimum values in 24V.
- the portable air conditioner is operated in the optimum state by changing the voltage V f2 inputted to the radiation fan 76, as shown in Fig. 7, when the voltage V f2 inputted to the radiation fan 76 ranges from 23 to 24V, the cooling quantity Q c and the performance factor COP are high and have the optimum values in 24V.
- the voltage V f2 inputted to the radiation fan 76 When the voltage V f2 inputted to the radiation fan 76 is too low, the air volume of the radiation fan 76 is small, air does not sufficiently evaporate and cool the radiation unit 54, and thus the cooling quantity Q c and the performance factor COP are low. When the voltage V f2 inputted to the radiation fan 76 is too high, the power W f2 inputted to the radiation fan 76 increases, and thus the performance factor COP is low. Accordingly, it is preferable to control the voltage V f2 inputted to the radiation fan 76 within an appropriate voltage range.
- the control unit 80 controls the voltages inputted to the thermoelectric module 50, the pump 78, the cooling fan 64 and the radiation fan 76 within the appropriate voltage ranges.
- the data input unit 82 acquires the data, and the operation control unit 84 compares and operates the data to control the voltages inputted to each element.
- Fig. 8 is a graph showing a cooling quantity and a performance factor according to a humidity of air, when the portable air conditioner is operated in the optimum state in accordance with the present invention
- Fig. 9 is a graph showing a cooling quantity and a performance factor according to a temperature of air, when the portable air conditioner is operated in the optimum state in accordance with the present invention.
- the portable air conditioner is operated in the optimum state by changing the relative humidity RH of air, as shown in Fig. 8, when the relative humidity RH of air is lower than 60%, the cooling quantity Q c and the performance factor COP are high.
- the portable air conditioner When the portable air conditioner is used in the place having a very high relative humidity RH of air, evaporation and cooling are not efficient in the radiation unit 54 of the thermoelectric module 50. Therefore, the cooling quantity Q c and the performance factor COP have low values.
- the portable air conditioner is operated in the optimum state by changing the temperature of air Ta, as shown in Fig. 9, when the temperature of air Ta is higher than 30°C, the cooling quantity Q c and the performance factor COP are high.
- the portable air conditioner When the portable air conditioner is used in the place having a very low temperature of air Ta, a temperature difference is small between the heat absorption unit 52 of the thermoelectric module 50 and the air, which prevents active heat transfer. In addition, evaporation and cooling are not efficient in the radiation unit 54 of the thermoelectric module 50, and thus the cooling quantity Q c and the performance factor COP decrease.
- thermoelectric module 50 When the set DC voltage is supplied to the thermoelectric module 50, the electrons move to the same direction in the P-type semiconductors P and the N-type semiconductors N of the thermoelectric module 50. Accordingly, the heat absorption unit 52 formed in one side ends of the P-type semiconductors P and the N-type semiconductors N maintains a low temperature to perform heat absorption, and the radiation unit 54 formed in the other side ends of the P-type semiconductors P and the N-type semiconductors N maintains a high temperature to perform radiation.
- the heat absorption plate 52a and the heat absorption fins 52b have a large air contact area, to sufficiently perform heat exchange in the heat absorption unit 52.
- the discharge hole 62b of the heat absorption passage guide 62 is formed in the upper portion, and thus cool air is discharged from the upper portion and evenly transferred to the lower portion.
- water sprayed to the radiation plate 54a and the radiation fins 54b is evaporated or collected by the water storage tank 77.
- thermoelectric module 50 the insulating wall 56 is installed between the heat absorption unit 52 and the radiation unit 54, radiation is actively performed due to evaporation and cooling of the radiation unit 54, and thus a temperature difference increases between the heat absorption unit 52 and the radiation unit 54, thereby preventing heat transfer by conduction. As a result, cooling efficiency is more improved.
- the flow meter 66 and the psychrometer 68 measure the volume, temperature and humidity of cool air discharged through the discharge hole 62b of the heat absorption passage guide 62.
- the data input unit 82 acquires the volume, temperature and humidity data measured by the flow meter 66 and the psychrometer 68, and the operation control unit 84 compares the data with the user-set values or the previously-stored reference values, to control the DC voltages supplied to the thermoelectric module 50, the pump 78, the cooling fan 64 and the radiation fan 76, respectively.
- the portable air conditioner in accordance with the present invention has the following advantages.
- the portable air conditioner generates cool air by exchanging heat of air in the heat absorption unit for performing heat absorption by using the thermoelectric module.
- the weight and size of the air conditioner are so reduced that the user can use the air conditioner when he/or she moves.
- the portable air conditioner composes the refrigerating cycle of the thermoelectric process by using the thermoelectric module. Therefore, the compressor is not used to prevent noises and vibrations, so that the user can pleasantly use the portable air conditioner. Furthermore, special refrigerants are not used to reduce environmental pollution.
- the portable air conditioner individually cools the part of the indoor space in which the user stays. Accordingly, cooling can be controlled for each user, to improve users' satisfaction.
- the radiation unit of the thermoelectric module is evaporated and cooled, and thus rapidly radiated.
- the portable air conditioner interrupts heat transfer by conduction between the heat absorption unit and the radiation unit, thereby improving cooling efficiency.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
- The present invention relates to a portable air conditioner, and more particularly to, a portable air conditioner which can individually provide a cool air current to each user and which can be easily moved due to a small size.
- In general, an air conditioner pleasantly cools an indoor space such as a residential area, restaurant or office by using a refrigerating cycle. The operation of the conventional air conditioner using the refrigerating cycle will now be explained with reference to Fig. 1.
- The conventional air conditioner using the refrigerating cycle includes a
compressor 2 for compressing refrigerants into high temperature high pressure gas refrigerants, acondenser 4 for condensing the refrigerants from thecompressor 2 into high temperature high pressure liquid refrigerants, an expansion means 6 for decompressing the refrigerants from thecondenser 4 into low temperature low pressure refrigerants, such as a capillary tube or electronic expansion valve, and anevaporator 8 for evaporating the refrigerants from the expansion means 6 into low temperature low pressure gas refrigerants. The aforementioned elements are connected to each other through refrigerant pipe lines. - And it includes an outdoor air blowing means (not shown) having a
radiation fan 12 and a motor (not shown) for forcibly blowing outdoor air to thecondenser 4 and disposed in one side of thecondenser 4, and an indoor air blowing means (not shown) having acooling fan 14 and a motor (not shown) for forcibly blowing indoor air to theevaporator 8 and disposed in one side of theevaporator 8. - Here, the refrigerants passing through the
condenser 4 are heat-exchanged with outdoor air and condensed, and the refrigerants passing through theevaporator 8 are heat-exchanged with indoor air and evaporated, to cool indoor air. - The operations of the motors for driving the
compressor 2, theradiation fan 12 and thecooling fan 14 are controlled by a control unit (not shown). According to a size of the indoor space to be cooled, each capacity of thecompressor 2, theradiation fan 12 and thecooling fan 14 is determined and the operations thereof are controlled by the control unit. - In the air conditioner, the
compressor 2, thecondenser 4, the expansion means 6, theevaporator 8, the outdoor air blowing means and the indoor air blowing means are incorporated into one unit and fixed to a wall or window, or thecompressor 2, thecondenser 4, the expansion means 6 and the outdoor air blowing means are incorporated into one outdoor unit and fixed to the outdoor space, and theevaporator 8 and the indoor air blowing means are incorporated into one indoor unit and fixed to the indoor space. - In the air conditioner, the
compressor 2 is operated to circulate the refrigerants through the refrigerating cycle, and theradiation fan 12 and thecooling fan 14 are driven to forcibly blow outdoor air and indoor air to thecondenser 4 and theevaporator 8, respectively. - In more detail, when the
compressor 2 is operated, the refrigerants are compressed into high temperature high pressure gas refrigerants. The refrigerants passing through thecompressor 2 are heat-exchanged with outdoor air and condensed into high temperature high pressure liquid refrigerants through thecondenser 4. The refrigerants passing through thecondenser 4 are expanded and decompressed into low temperature low pressure refrigerants through the expansion means 6. The refrigerants passing through the expansion means 6 are heat-exchanged with indoor air and evaporated into low temperature low pressure gas refrigerants through theevaporator 8, thereby cooling indoor air. - In addition, when the
radiation fan 12 is operated, outdoor air is forcibly blown to thecondenser 4, and thus efficiently heat-exchanged with the refrigerants passing through thecondenser 4, and when thecooling fan 14 is operated, indoor air is forcibly blown to theevaporator 8, and thus efficiently heat-exchanged with the refrigerants passing through theevaporator 8. - However, in the conventional air conditioner, because the refrigerants are compressed under a high pressure, the compressor and the refrigerant pipe lines in which the high pressure refrigerants are circulated require high pressure resistance. Accordingly, a weight and size of the compressor and the refrigerant pipe lines increase. Moreover, the elements are connected to each other through the refrigerant pipe lines, and thus not easily installed or moved. When the user moves to a different space, the cooling effects are useless.
- In the conventional air conditioner, the compressor is connected to the other elements through the refrigerant pipe lines, and thus vibrations and noises of the compressor are transmitted to the indoor space, which may irritate the users. Freon-based refrigerants of the air conditioner cause environmental pollution.
- The conventional air conditioner cools the whole indoor space, and thus fails to satisfy all the users in the space. Furthermore, the air conditioner cools the part of the indoor space in which any of the users does not stay, which reduces cooling efficiency
-
UK patent application GB 2 267 338 -
United States Patent US 6,058.712 discloses all the features of the preamble ofclaim 1, thereby disclosing a system for conditioning air, which includes thermoelectric devices. Among others, this system comprises a thermoelectric module having a heat absorption unit for absorbing peripheral heat and a radiation unit for radiating heat to the periphery and performing heat absorption and radiation at the same time when receiving electric current. Furthermore, an air blowing means is installed near the heat absorption unit for blowing air to exchange heat between the heat absorption unit and the air and a radiation means is installed near the radiation unit for cooling the radiation unit. The system also includes a control unit for controlling the thermoelectric module, the air blowing means and the radiation means. - An object of the present invention is to provide a portable air conditioner, which despite being small and light for the user to use when he/she moves, has increased cooling efficiency.
- Another object of the present invention is to provide a portable air conditioner which can guarantee a pleasant environment by preventing noises and vibrations and removing refrigerants.
- Yet another object of the present invention is to provide a portable air conditioner which can improve users' satisfaction by controlling cooling for each user.
- In order to achieve the above-described objects of the invention, there is provided a portable air conditioner including: a thermoelectric module having a heat absorption unit for absorbing peripheral heat and a radiation unit for radiating heat to the periphery in the facing portions, and performing heat absorption and radiation at the same time when receiving electric current; an air blowing means installed near the heat absorption unit, for blowing air to exchange heat between the heat absorption unit and the air, a radiation means installed near the radiation unit, for cooling the radiation unit; and a control unit for controlling the thermoelectric module, the air blowing means and the radiation means. The radiation means comprises a spray nozzle for spraying water to the radiation unit so that water sprayed from the spray nozzle to the radiation unit can be evaporatated to cool the radiation unit.
- According to one aspect of the invention, the thermoelectric module includes P-type semiconductors and N-type semiconductors in pairs, and the heat absorption unit and the radiation unit are formed in both ends of the P-type semiconductors and the N-type semiconductors.
- Preferably, the plurality of thermoelectric modules are connected in series.
- More preferably, a plurality of heat absorption fins are installed in the heat absorption unit, and a plurality of radiation fins are installed in the radiation unit, for widening a heat transfer area.
- According to another aspect of the invention, the air blowing means includes a heat absorption passage guide having a suction hole and a discharge hole for sucking and discharging air, having the heat absorption unit or heat absorption fins built in between the suction hole and the discharge hole, and guiding air, and a cooling fan and a motor installed inside the heat absorption passage guide, for blowing air along the heat absorption passage guide.
- Preferably, in the heat absorption passage guide, the suction hole is formed in the lower portion, the discharge hole is formed in the upper portion, and the cooling fan is installed inside the discharge hole.
- More preferably, the cooling fan is a cross flow fan.
- According to yet another aspect of the invention, the radiation means includes a radiation fan and a motor for blowing air to the radiation unit, so that water sprayed from the spray nozzle to the radiation unit can be evaporated to cool the radiation unit.
- Preferably, the radiation means further includes a radiation passage guide having a suction hole and a discharge hole for sucking and discharging air, having the radiation unit built in between the suction hole and the discharge hole, and guiding air.
- Preferably, in the radiation passage guide, the suction hole is formed in the upper portion, the discharge hole is formed in the lower portion, and the radiation fan is installed inside the suction hole.
- Preferably, the radiation means further includes a water storage tank installed in the lower portion of the radiation passage guide, for collecting water sprayed from the spray nozzle and storing water, and a pump for pumping water stored in the water storage tank to the spray nozzle.
- Preferably, the spray nozzle is installed inside the suction hole of the radiation passage guide, for spraying water from the upper portion of the radiation unit.
- The present invention will become better understood with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein:
- Fig. 1 is an operation state view illustrating a general air conditioner using a refrigerating cycle;
- Fig. 2 is a structure view illustrating a portable air conditioner in accordance with the present invention;
- Fig. 3 is a side-sectional view illustrating major elements of the portable air conditioner in accordance with the present invention;
- Fig. 4 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to a thermoelectric module, when the portable air conditioner is operated in the optimum state in accordance with the present invention;
- Fig. 5 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to a pump, when the portable air conditioner is operated in the optimum state in accordance with the present invention;
- Fig. 6 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to a cooling fan, when the portable air conditioner is operated in the optimum state in accordance with the present invention;
- Fig. 7 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to a radiation fan, when the portable air conditioner is operated in the optimum state in accordance with the present invention;
- Fig. 8 is a graph showing a cooling quantity and a performance factor according to a humidity of air, when the portable air conditioner is operated in the optimum state in accordance with the present invention; and
- Fig. 9 is a graph showing a cooling quantity and a performance factor according to a temperature of air, when the portable air conditioner is operated in the optimum state in accordance with the present invention.
- Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
- Fig. 2 is a structure view illustrating a portable air conditioner in accordance with the p resent invention, a nd Fig. 3 is a side-sectional view illustrating major elements of the portable air conditioner in accordance with the present invention.
- Referring to Figs. 2 and 3, the portable air conditioner includes a
thermoelectric module 50 having aheat absorption unit 52 and aradiation unit 54 in the facing portions, and performing heat absorption for absorbing peripheral heat in theheat absorption unit 52 and radiation for radiating heat to the periphery in theradiation unit 54 at the same time when receiving electric current, an air blowing means 60 installed near theheat absorption unit 52, for blowing air to theheat absorption unit 52 to exchange heat between theheat absorption unit 52 and the air, a radiation means 70 installed near theradiation unit 54, for spaying water to theradiation unit 54 for evaporation and cooling, and acontrol unit 80 for controlling thethermoelectric module 50, the air blowing means 60 and the radiation means 70. - In detail, the
thermoelectric module 50 is a chip-type electronic cooling material using a thermoelectric semiconductor which is an energy conversion material as a basic material. Thethermoelectric module 50 is comprised of P-type semiconductors P having deficient electrons and N-type semiconductors N having excessive electrons in pairs. The plurality of P-type semiconductors P and the plurality of N-type semiconductors N are installed to have their one side ends alternately electrically connected in series by a metal electrode. When receiving a DC voltage, electrons move heat to the same direction In the different semiconductors. Theheat absorption unit 52 for performing heat absorption is formed in one side ends of the P-type semiconductors P and the N-type semiconductors N, and theradiation unit 54 for performing radiation is formed in the other side ends thereof. - Here,
heat transfer plates thermoelectric module 50. A plurality ofheat absorption fins 52b for widening a heat absorption area are formed on the heat transfer plate (heat absorption plate 52a) of theheat absorption unit 52, and a plurality ofradiation fins 54b for widening a radiation area are formed on the heat transfer plate (radiation plate 54a) of theradiation unit 54. The electrodes for connecting the P-type semiconductors P a nd the N -type semiconductors N are fixed to theheat transfer plates - In the
thermoelectric module 50, an insulatingwall 56 is partially inserted between theheat absorption unit 52 and theradiation unit 54, and the P-type semiconductors P and the N-type semiconductors N are built in apartition wall 57. The insulatingwall 56 delays transferring heat from theradiation unit 54 to theheat absorption unit 52 by conduction, and thepartition wall 57 partitions the spaces of theheat absorption unit 52 and theradiation unit 54 and prevents heat transfer of air flowing through each space by convection, thereby improving heat exchange efficiency. - A
DC power supply 58 is connected to the metal electrode, for supplying a set voltage. Here, the set voltage must be determined to improve cooling performance. That is, when the set voltage is supplied to thethermoelectric module 50, the set voltage must lower a temperature of theheat absorption unit 52 below a predetermined value and prevent a temperature of theradiation unit 54 from increasing over a predetermined value. - The
thermoelectric module 50 employs the Peltier effect discovered by the French physicist Athahase Peltier (1785-1845). According to the Peltier effect, when a loop is formed by using two kinds of metals, if electric current is applied to the middle of the loop, one junction generates heat and the other junction absorbs heat. - The air blowing means 60 includes a heat absorption passage guide 62 fixedly installed in one side of the
partition wall 57 to have theheat absorption plate 52a and theheat absorption fins 52b of theheat absorption unit 52 built in, for forming a passage for flowing air between asuction hote 62a and adischarge hole 62b, and a coolingfan 64 and a motor (not shown) installed inside the heatabsorption passage guide 62, for blowing air along the heatabsorption passage guide 62. - In the heat
absorption passage guide 62, thesuction hole 62a is formed in the lower portion so that relatively light hot air can be sucked from the lower portion, upwardly transferred and actively heat-exchanged with theheat absorption plate 52a and theheat absorption fins 52b, and thedischarge hole 62b is formed in the upper portion so that heat-exchanged and thus relatively heavy cool air can be discharged from the upper portion and easily downwardly transferred. The passage between thesuction hole 62a and thedischarge hole 62b is vertically formed to minimize flow loss of air. - Preferably, the cooling
fan 64 and the motor are installed inside thedischarge hole 62b and controlled by thecontrol unit 80, to increase a volume of cool air discharged to the user. More preferably, the coolingfan 64 is a cross flow fan for increasing an air volume and decreasing noises. - Moreover, a
flow meter 66 and apsychrometer 68 are connected near thedischarge hole 62b of the heatabsorption passage guide 62, for measuring a volume, temperature and humidity of cool air discharged to the user. Thecontrol unit 80 controls the whole elements according to the data. - The radiation means 70 includes a
radiation passage guide 72 fixedly installed in the other side of thepartition wall 57 to have theradiation plate 54a and theradiation fins 54b of theradiation unit 54 built in, for forming a passage for flowing air between asuction hole 72a and a discharge hole (not shown), aspray nozzle 74 for spraying water to theradiation plate 54a and theradiation fins 54b, and aradiation fan 76 and a motor (not shown) for blowing air to theradiation plate 54a and theradiation fins 54b, so that water sprayed from thespray nozzle 74 to theradiation plate 54a and theradiation fins 54b can be evaporated to cool theradiation plate 54a and theradiation fins 54b. - In the
radiation passage guide 72, thesuction hole 72a is formed in the upper portion, the discharge hole is formed in the lower portion, theradiation fan 76 and the motor are installed inside thesuction hole 72a, and thespray nozzle 74 is installed in the lower portion of theradiation fan 76 and the motor so that water can be sprayed from the upper portion of theradiation plate 54a and theradiation fins 54b. Preferably, ahole 74h for spraying water is installed toward the upper portion of theradiation plate 54a and theradiation fins 54b. - Here, the operations of the
radiation fan 76 and the motor are controlled by thecontrol unit 80. Preferably, theradiation fan 76 is a cross flow fan for increasing an air volume and decreasing noises. - The radiation means 70 further includes a
water storage tank 77 installed in the lower portion of theradiation passage guide 72, for collecting and storing water sprayed from thespray nozzle 74, and apump 78 for pumping water stored in thewater storage tank 77 to thespray nozzle 74. The operation of thepump 78 is also controlled by thecontrol unit 80. - The
control unit 80 is divided into adata input unit 82 for acquiring volume, temperature and humidity data of cool air discharged to thedischarge hole 62b of the heatabsorption passage guide 62, and anoperation control unit 84 connected to thedata input unit 82, for comparing the data with user-set values or previously-stored reference values to control the operations of the elements. - The
control unit 80 controls a DC voltage inputted to the motors for driving the coolingfan 64 and theradiation fan 76, or a DC voltage inputted to thepump 78. Here, thecontrol unit 80 controls the DC voltages inputted to each element in consideration of a cooling quantity Qc and a performance factor COP. - The
thermoelectric module 50 can be connected directly to theDC power supply 58, for receiving the set voltage. It is also possible to control a size of the voltage from theDC power supply 58 by thecontrol unit 80 and then input the controlled voltage to thethermoelectric module 50. - The cooling quantity Qc is a heat quantity absorbed by the
heat absorption unit 52 of thethermoelectric module 50, and represented by the followingFormula 1, and the performance factor COP is a rate of the cooling quantity Qc to power inputted to thethermoelectric module 50, the coolingfan 64, theradiation fan 76 and thepump 78, and represented by the following Formula 2: -
- Here, COP denotes a performance factor, Qc denotes a cooling quantity of the
above Formula 1, and Wt, Wp, Wf1 and Wf2 denote power supplied to thethermoelectric module 50, thepump 78, the coolingfan 64 and theradiation fan 76, respectively. - As described above, in consideration of the cooling quantity Qc, the
control unit 80 raises the DC voltages supplied to the coolingfan 64, theradiation fan 76 and thepump 78 in order to improve heat exchange by increasing a volume of air and sprayed water, and in consideration of both the cooling quantity Qc and the performance factor COP, thecontrol unit 80 inputs the optimum DC voltages to each element in order to obtain the appropriate cooling quantity Qc, reduce the power inputted to each element and obtain the cooling quantity Qc over a predetermined value. - Fig. 4 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the thermoelectric module, when the portable air conditioner is operated in the optimum state in accordance with the present invention, Fig. 5 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the pump, when the portable air conditioner is operated in the optimum state in accordance with the present invention, Fig. 6 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the cooling fan, when the portable air conditioner is operated in the optimum state in accordance with the present invention, and Fig. 7 is a graph showing a cooling quantity and a performance factor according to a voltage inputted to the radiation fan, when the portable air conditioner is operated in the optimum state in accordance with the present invention.
- When the optimum state of the portable air conditioner is detected based on the test data considering the cooling quantity Qc and the performance factor COP, the voltages inputted to the
thermoelectric module 50, thepump 78, the coolingfan 64 and theradiation fan 76 are Vt=18V, Vp=6V, Vf1=24V and Vf2=24V, the relative humidity of air is RH=60%, and the temperature of air is Ta=30°C. - In detail, in the case that the portable air conditioner is operated in the optimum state by changing the voltage Vt inputted to the
thermoelectric module 50, as shown in Fig. 4, when the voltage Vt inputted to thethermoelectric module 50 ranges from 15 to 20V, the cooling quantity Qc and the performance factor COP are high and have the optimum values in 18V. - When the voltage Vt inputted to the
thermoelectric module 50 is too low, theheat absorption unit 52 is rarely maintained below a set temperature, and thus the cooling quantity Qc and the performance factor COP have low values. When the voltage Vt inputted to thethermoelectric module 50 is too high, theradiation unit 54 is overheated to transfer heat to theheat absorption unit 52 by conduction, and thus the cooling quantity Qc and the performance factor COP have low values. Accordingly, it is preferable to control the voltage Vt inputted to thethermoelectric module 50 within an appropriate voltage range. - That is, the voltage Vt inputted to the
thermoelectric module 50 is controlled to have the highest value within the voltage range for preventing heat transfer from theradiation unit 54 to theheat absorption unit 52 by conduction during the operation of thethermoelectric module 50. - In the case that the portable air conditioner is operated in the optimum state by changing the voltage Vp inputted to the
pump 78, as shown In Fig. 5, when the voltage Vp inputted to thepump 78 ranges from 6 to 9V, the cooling quantity Qc and the performance factor COP are high and have the optimum values in 6V. - When the voltage Vp inputted to the
pump 78 is 9V, the cooling quantity Qc has the highest value. However, as the voltage Vp inputted to thepump 78 decreases, the performance factor COP increases. Therefore, it is also preferable to control the voltage Vp inputted to thepump 78 within an appropriate voltage range. - The voltage Vp inputted to the
pump 78 is controlled within the appropriate range determined according to the size of thethermoelectric module 50 and the number of thespray nozzles 74. - In the case that the portable air conditioner is operated in the optimum state by changing the voltage Vf1 inputted to the cooling
fan 64, as shown in Fig. 6, when the voltage Vf1 inputted to the coolingfan 64 ranges from 23 to 24V, the cooling quantity Qc and the performance factor COP are high and have the optimum values in 24V. - When the voltage Vf1 inputted to the cooling
fan 64 is too low, the air volume of the coolingfan 64 is small, air is not sufficiently heat-exchanged with theheat absorption unit 52, and thus the cooling quantity Qc and the performance factor COP are low. When the voltage Vf1 inputted to the coolingfan 64 is too high, the power Wf1 inputted to the coolingfan 64 increases, and thus the performance factor COP is low. It is therefore preferable to control the voltage Vf1 inputted to the coolingfan 64 within an appropriate voltage range. - In the case that the portable air conditioner is operated in the optimum state by changing the voltage Vf2 inputted to the
radiation fan 76, as shown in Fig. 7, when the voltage Vf2 inputted to theradiation fan 76 ranges from 23 to 24V, the cooling quantity Qc and the performance factor COP are high and have the optimum values in 24V. - When the voltage Vf2 inputted to the
radiation fan 76 is too low, the air volume of theradiation fan 76 is small, air does not sufficiently evaporate and cool theradiation unit 54, and thus the cooling quantity Qc and the performance factor COP are low. When the voltage Vf2 inputted to theradiation fan 76 is too high, the power Wf2 inputted to theradiation fan 76 increases, and thus the performance factor COP is low. Accordingly, it is preferable to control the voltage Vf2 inputted to theradiation fan 76 within an appropriate voltage range. - The
control unit 80 controls the voltages inputted to thethermoelectric module 50, thepump 78, the coolingfan 64 and theradiation fan 76 within the appropriate voltage ranges. When theflow meter 66 and thepsychrometer 68 measure the volume, temperature and humidity of cool air discharged through thedischarge hole 62b of the heatabsorption passage guide 62, thedata input unit 82 acquires the data, and theoperation control unit 84 compares and operates the data to control the voltages inputted to each element. - Fig. 8 is a graph showing a cooling quantity and a performance factor according to a humidity of air, when the portable air conditioner is operated in the optimum state in accordance with the present invention, and Fig. 9 is a graph showing a cooling quantity and a performance factor according to a temperature of air, when the portable air conditioner is operated in the optimum state in accordance with the present invention.
- In the case that the portable air conditioner is operated in the optimum state by changing the relative humidity RH of air, as shown in Fig. 8, when the relative humidity RH of air is lower than 60%, the cooling quantity Qc and the performance factor COP are high.
- When the portable air conditioner is used in the place having a very high relative humidity RH of air, evaporation and cooling are not efficient in the
radiation unit 54 of thethermoelectric module 50. Therefore, the cooling quantity Qc and the performance factor COP have low values. Preferably, the portable air conditioner is used in the place having a relative humidity RH of air lower than a predetermined value (for example, RH=60%). - In the case that the portable air conditioner is operated in the optimum state by changing the temperature of air Ta, as shown in Fig. 9, when the temperature of air Ta is higher than 30°C, the cooling quantity Qc and the performance factor COP are high.
- When the portable air conditioner is used in the place having a very low temperature of air Ta, a temperature difference is small between the
heat absorption unit 52 of thethermoelectric module 50 and the air, which prevents active heat transfer. In addition, evaporation and cooling are not efficient in theradiation unit 54 of thethermoelectric module 50, and thus the cooling quantity Qc and the performance factor COP decrease. Preferably, the portable air conditioner is used in the place having a temperature of air Ta higher than a predetermined value (for example, Ta=30°C). - The operation of the portable air conditioner in accordance with the present invention will now be explained.
- When the set DC voltage is supplied to the
thermoelectric module 50, the electrons move to the same direction in the P-type semiconductors P and the N-type semiconductors N of thethermoelectric module 50. Accordingly, theheat absorption unit 52 formed in one side ends of the P-type semiconductors P and the N-type semiconductors N maintains a low temperature to perform heat absorption, and theradiation unit 54 formed in the other side ends of the P-type semiconductors P and the N-type semiconductors N maintains a high temperature to perform radiation. - In the
heat absorption unit 52 side, when the coolingfan 64 is driven, air sucked through thesuction hole 62a of the heat absorption passage guide 62 upwardly moves along the heatabsorption passage guide 62, passes through theheat absorption plate 52a and theheat absorption fins 52b, and is discharged to thedischarge hole 62b of the heatabsorption passage guide 62. Because air is heat-exchanged with theabsorption plate 52a and theheat absorption fins 52b, cool air is discharged. - Here, the
heat absorption plate 52a and theheat absorption fins 52b have a large air contact area, to sufficiently perform heat exchange in theheat absorption unit 52. Moreover, thedischarge hole 62b of the heatabsorption passage guide 62 is formed in the upper portion, and thus cool air is discharged from the upper portion and evenly transferred to the lower portion. - In the
radiation unit 54 side, when theradiation fan 76 is driven, air sucked through thesuction hole 72a of theradiation passage guide 72 downwardly moves along theradiation passage guide 72, passes through theradiation plate 54a and theradiation fins 54b, and is discharged to the discharge hole of theradiation passage guide 72. Air is heat-exchanged with theradiation plate 54a and theradiation fins 54. - At the same time, when the
pump 78 is driven, water stored in thewater storage tank 77 is pumped and sprayed to theradiation plate 54a and theradiation fins 54b through thespray nozzle 74, and air blown by theradiation fan 76 evaporates water sprayed to the surfaces of theradiation plate 54a and theradiation fins 54b. Water sprayed to the surfaces of theradiation plate 54a and theradiation fins 54b absorbs heat of vaporization during the evaporation, and thus evaporation and cooling are performed in theradiation unit 54. - Here, water sprayed to the
radiation plate 54a and theradiation fins 54b is evaporated or collected by thewater storage tank 77. - In the
thermoelectric module 50, the insulatingwall 56 is installed between theheat absorption unit 52 and theradiation unit 54, radiation is actively performed due to evaporation and cooling of theradiation unit 54, and thus a temperature difference increases between theheat absorption unit 52 and theradiation unit 54, thereby preventing heat transfer by conduction. As a result, cooling efficiency is more improved. - The
flow meter 66 and thepsychrometer 68 measure the volume, temperature and humidity of cool air discharged through thedischarge hole 62b of the heatabsorption passage guide 62. In thecontrol unit 80, thedata input unit 82 acquires the volume, temperature and humidity data measured by theflow meter 66 and thepsychrometer 68, and theoperation control unit 84 compares the data with the user-set values or the previously-stored reference values, to control the DC voltages supplied to thethermoelectric module 50, thepump 78, the coolingfan 64 and theradiation fan 76, respectively. - The portable air conditioner in accordance with the present invention has the following advantages.
- First, the portable air conditioner generates cool air by exchanging heat of air in the heat absorption unit for performing heat absorption by using the thermoelectric module. The weight and size of the air conditioner are so reduced that the user can use the air conditioner when he/or she moves.
- Second, the portable air conditioner composes the refrigerating cycle of the thermoelectric process by using the thermoelectric module. Therefore, the compressor is not used to prevent noises and vibrations, so that the user can pleasantly use the portable air conditioner. Furthermore, special refrigerants are not used to reduce environmental pollution.
- Third, the portable air conditioner individually cools the part of the indoor space in which the user stays. Accordingly, cooling can be controlled for each user, to improve users' satisfaction. In addition, the radiation unit of the thermoelectric module is evaporated and cooled, and thus rapidly radiated. The portable air conditioner interrupts heat transfer by conduction between the heat absorption unit and the radiation unit, thereby improving cooling efficiency.
- Although the preferred embodiments of the present invention have been described, it is understood that the present invention should not be limited to the preferred embodiment but various changes and modifications can be made by one skilled in the art within the scope of the present invention as hereinafter claimed.
Claims (13)
- A portable air conditioner, comprising:a thermoelectric module (50) having a heat absorption unit (52) for absorbing peripheral heat and a radiation unit (54) for radiating heat to the periphery in the facing portions, and performing heat absorption and radiation at the same time when receiving electric current;an air blowing means (60) installed near the heat absorption unit, for blowing air to exchange heat between the heat absorption unit and the air,a radiation means (70) installed near the radiation unit, for cooling the radiation unit; anda control unit (80) for controlling the thermoelectric module, the air blowing means and the radiation meanscharacterized in that
the radiation means (70) comprises a spray nozzle (74) for spraying water to the radiation unit so that water sprayed from the spray nozzle to the radiation unit can be evaporated to cool the radiation unit. - The portable air conditioner of claim 1, wherein the thermoelectric module comprises P-type semiconductors (P) and N-type semiconductors (N) in pairs, and the heat absorption unit and the radiation unit are formed in both ends of the P-type semiconductors and the N-type semiconductors.
- The portable air conditioner of claim 2, wherein the plurality of thermoelectric modules are connected in series.
- The portable air conditioner of any one of claims 1 to 3, wherein a plurality of heat absorption fins (52b) are installed in the heat absorption unit, for widening a heat transfer area.
- The portable air conditioner of any one of claims 1 to 3, wherein a plurality of radiation fins (54b) are installed in the radiation unit, for widening a heat transfer area.
- The portable air conditioner of any one of claims 1 to 5, wherein the air blowing means comprises a heat absorption passage guide (62) having a suction hole (62a) and a discharge hole (62b) for sucking and discharging air, having the heat absorption unit or heat absorption fins built in between the suction hole and the discharge hole, and guiding air, and a cooling fan (64) and a motor installed inside the heat absorption passage guide, for blowing air along the heat absorption passage guide.
- The portable air conditioner of claim 6, wherein, in the heat absorption passage guide (62), the suction hole (62a) is formed in the lower portion, the discharge hole (62b) is formed in the upper portion, and the cooling fan (64) is installed inside the discharge hole.
- The portable air conditioner of claim 7, wherein the cooling fan (64) is a cross flow fan.
- The portable air conditioner of any one of claims 1 to 5, wherein the radiation means (70) comprises a radiation fan (76) and a motor for blowing air to the radiation unit.
- The portable air conditioner of claim 9, wherein the radiation means further comprises a radiation passage guide (72) having a suction hole (72a) and a discharge hole (72b) for sucking and discharging air, having the radiation unit built in between the suction hole and the discharge hole, and guiding air.
- The portable air conditioner of claim 10, wherein, in the radiation passage guide (72), the suction hole (72a) is formed in the upper portion, the discharge hole (72b) is formed in the lower portion, and the radiation fan (76) is installed inside the suction hole.
- The portable air conditioner of claim 10, wherein the radiation means further comprises a water storage tank (77) installed in the lower portion of the radiation passage guide (72), for collecting water sprayed from the spray nozzle (74) and storing water, and a pump (78) for pumping water stored in the water storage tank to the spray nozzle.
- The portable air conditioner of claim 12, wherein the spray nozzle (74) is installed inside the suction hole (72a) of the radiation passage guide, for spraying water from the upper portion of the radiation unit.
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PCT/KR2003/002885 WO2005064241A1 (en) | 2003-12-30 | 2003-12-30 | Portable air conditioner |
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EP1706675A1 EP1706675A1 (en) | 2006-10-04 |
EP1706675B1 true EP1706675B1 (en) | 2008-01-09 |
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EP (1) | EP1706675B1 (en) |
AT (1) | ATE383550T1 (en) |
AU (1) | AU2003289570A1 (en) |
DE (1) | DE60318639D1 (en) |
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WO (1) | WO2005064241A1 (en) |
Cited By (1)
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---|---|---|---|---|
CN103629763A (en) * | 2013-10-14 | 2014-03-12 | 天津大学 | Semiconductor refrigeration and heating air-conditioning tent used in dormitory |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2483936A (en) * | 2010-09-23 | 2012-03-28 | Ng Ka Yu | Portable air conditioner including thermoelectric cooling |
CN103574808A (en) * | 2013-10-16 | 2014-02-12 | 西安工程大学 | Direct evaporation cooling air conditioner unit with variable air flue |
EP3172502B1 (en) * | 2014-07-21 | 2019-11-20 | Phononic Devices, Inc. | Systems and methods for operating a thermoelectric module to increase efficiency |
CN110160176A (en) * | 2018-02-16 | 2019-08-23 | 殷震雄 | A kind of light conditioner |
CN111750565B (en) * | 2020-07-06 | 2022-08-26 | 李田方 | Cooling assembly for electronic product or electric equipment |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2949014A (en) * | 1958-06-02 | 1960-08-16 | Whirlpool Co | Thermoelectric air conditioning apparatus |
GB2267338A (en) * | 1992-05-21 | 1993-12-01 | Chang Pen Yen | Thermoelectric air conditioning |
US6058712A (en) * | 1996-07-12 | 2000-05-09 | Thermotek, Inc. | Hybrid air conditioning system and a method therefor |
-
2003
- 2003-12-30 EP EP03781045A patent/EP1706675B1/en not_active Expired - Lifetime
- 2003-12-30 ES ES03781045T patent/ES2298600T3/en not_active Expired - Lifetime
- 2003-12-30 WO PCT/KR2003/002885 patent/WO2005064241A1/en active IP Right Grant
- 2003-12-30 AT AT03781045T patent/ATE383550T1/en not_active IP Right Cessation
- 2003-12-30 DE DE60318639T patent/DE60318639D1/en not_active Expired - Lifetime
- 2003-12-30 AU AU2003289570A patent/AU2003289570A1/en not_active Abandoned
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103629763A (en) * | 2013-10-14 | 2014-03-12 | 天津大学 | Semiconductor refrigeration and heating air-conditioning tent used in dormitory |
Also Published As
Publication number | Publication date |
---|---|
WO2005064241A1 (en) | 2005-07-14 |
ATE383550T1 (en) | 2008-01-15 |
ES2298600T3 (en) | 2008-05-16 |
AU2003289570A1 (en) | 2005-07-21 |
EP1706675A1 (en) | 2006-10-04 |
DE60318639D1 (en) | 2008-02-21 |
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