WO2017119122A1 - 換気装置及び除霜方法 - Google Patents
換気装置及び除霜方法 Download PDFInfo
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- WO2017119122A1 WO2017119122A1 PCT/JP2016/050522 JP2016050522W WO2017119122A1 WO 2017119122 A1 WO2017119122 A1 WO 2017119122A1 JP 2016050522 W JP2016050522 W JP 2016050522W WO 2017119122 A1 WO2017119122 A1 WO 2017119122A1
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- air
- heat exchanger
- air passage
- temperature
- defrosting
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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
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Definitions
- the present invention relates to a ventilation device and a defrosting method.
- a ventilator having both an air supply function for supplying outdoor air into the room and an exhaust function for discharging indoor air to the outside.
- a ventilator often includes a heat exchanger when it is provided with an air conditioner or included in an air conditioning system. This heat exchanger recovers heat by exchanging heat between indoor air to be exhausted and outdoor air to be supplied. Thereby, an air-conditioning load will reduce and the utilization efficiency of energy will improve.
- Patent Document 1 describes a technique for defrosting a heat exchanger by selectively blocking a part of a flow path of a heat exchanger through which air from the outside flows.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to defrost a heat exchanger without reducing the ventilation air volume.
- a ventilator is a ventilator having an exhaust air passage for exhausting air from the room to the outside and an air supply air passage for supplying air from the outside to the room, the exhaust air passage.
- a heat exchanger that exchanges heat between the air passing through the air and the air passing through the air supply air passage, and when frost adheres to the heat exchanger, the state of the air flowing into the exhaust air passage or the air supply air passage is changed.
- a defrosting means for defrosting the heat exchanger.
- the heat exchanger is defrosted by changing the state of the air flowing into the exhaust air passage or the supply air passage. Therefore, a heat exchanger can be defrosted, without reducing ventilation air volume.
- FIG. It is a figure which shows the structure of the air conditioning system which concerns on Embodiment 1.
- FIG. It is a figure which shows the structure of the ventilation apparatus which concerns on Embodiment 1.
- FIG. It is an air line figure which shows an example of the state change of the air by a heat exchanger. It is a figure which shows the example which changed arrangement
- FIG. It is a figure which shows the structure of the ventilation apparatus which concerns on Embodiment 2.
- FIG. It is a figure which shows the structure of the ventilation apparatus which concerns on Embodiment 3.
- FIG. It is a figure which shows the structure of the ventilation apparatus which concerns on Embodiment 4.
- FIG. It is a figure which shows the other structure of the ventilation apparatus which concerns on Embodiment 4.
- FIG. It is a figure which shows the structure of the ventilation apparatus which concerns on Embodiment 5.
- FIG. It is an air diagram which shows an example of the state change of the air when an adsorption
- FIG. 1 shows a configuration of an air conditioning system 1000 according to the first embodiment.
- the air conditioning system 1000 is a system that harmonizes the state of air in the indoor space A1 to be air conditioned.
- the indoor space A1 is, for example, a room in a house, an office floor, a work place in a factory, a warehouse, a passage, a space in a vehicle, or an underground space.
- the interior of the indoor space A1 is simply referred to as “indoor”, and the exterior of the indoor space A1 is simply referred to as “outdoor”.
- the outdoor space may be a natural space exposed to wind and rain, or may be a space inside a building.
- the air conditioning system 1000 includes a ventilator 100 that exchanges indoor air and outdoor air, and a temperature and humidity adjustment system 300 that adjusts the temperature and humidity of the room air.
- the temperature / humidity adjustment system 300 includes an outdoor unit 31 installed outdoors and indoor units 32, 33, and 34 installed indoors and connected to the outdoor unit 31 via refrigerant piping.
- the ventilation device 100 supplies air from the outside into the room by sucking outdoor air and blowing out supply air.
- OA indicates outdoor air
- SA indicates supply air
- the ventilator 100 exhausts the indoor air from the room by sucking the indoor air and blowing out the exhaust air.
- RA in FIG. 1 indicates room air
- EA indicates exhaust air.
- the ventilating apparatus 100 has an air supply air passage B1 for supplying air from the outside to the room and an exhaust air passage B2 for exhausting air from the room to the outside.
- the supply air path B1 is a flow path through which air passes before the outdoor air OA flows in and the supply air SA is blown out.
- the exhaust air passage B2 is a passage through which air passes before the room air RA flows in and the exhaust air EA is blown out.
- the air flow in the supply air passage B1 is indicated by a broken line
- the air flow in the exhaust air passage B2 is indicated by a one-dot chain line.
- the supply air passage B1 and the exhaust air passage B2 are independent of each other. That is, air does not move between the supply air passage B1 and the exhaust air passage B2 inside the ventilation device 100.
- the ventilation device 100 includes a heat exchanger 10 that exchanges heat between air passing through the supply air passage B1 and air passing through the exhaust air passage B2, and a temperature detection unit that detects the temperature of the air that has passed through the heat exchanger 10. 11, a defrosting section 12 that defrosts the heat exchanger 10 when frost adheres to the heat exchanger 10, an air supply blower 21 disposed in the supply air passage B ⁇ b> 1, and an exhaust air passage B ⁇ b> 2. And an exhaust blower 22 arranged.
- the heat exchanger 10 is a total heat exchanger in which layers in which the air in the supply air passage B1 flows and layers in which the air in the exhaust air passage B2 flows are alternately stacked. In FIG. 2, the heat exchanger 10 is shown by the rhombus comprised by the thick line.
- the heat exchanger 10 is used for recovering heat when air is exchanged by the ventilator 100. For example, when the heat exchanger 10 moves the heat of the air in the exhaust air passage B2 to the air in the supply air passage B1 in winter when the indoor air temperature is kept higher than the outdoor air temperature by the temperature and humidity control system 300, the supply air SA becomes warmer than the outdoor air OA, and a part of the heat amount of the indoor air RA is recovered by the heat exchanger 10.
- FIG. 3 shows an example of state changes of the outdoor air OA, the supply air SA, the indoor air RA, and the exhaust air EA by the heat exchanger 10 in winter.
- the outdoor air OA changes to a state close to the indoor air RA by exchanging heat with the indoor air RA that has flowed into the heat exchanger 10, and becomes the supply air SA with higher temperature and humidity.
- the indoor air RA changes to a state close to the outdoor air OA by exchanging heat with the outdoor air OA that has flowed into the heat exchanger 10, and becomes exhaust air EA having a lower temperature and lower humidity.
- the heat exchanger 10 recovers heat, so that the ventilator 100 reduces the heating load of the temperature / humidity adjustment system 300 compared to the case where the outdoor air OA is directly supplied indoors. It will contribute to energy saving. Even in the summer when the indoor air temperature is kept lower than the outdoor air temperature by the temperature / humidity adjustment system 300, the ventilator 100 reduces the cooling load of the temperature / humidity adjustment system 300 by heat recovery by the heat exchanger 10. Will contribute to energy savings. More specifically, the outdoor air OA changes to a state close to the indoor air RA to become a low-temperature and low-humidity supply air SA, and the indoor air RA changes to a state close to the outdoor air OA to increase the temperature and humidity. Exhaust air EA.
- the temperature detection unit 11 includes a temperature sensor represented by, for example, a resistance thermometer, and an arithmetic circuit.
- the temperature detection unit 11 according to the present embodiment is disposed in the supply air passage B1 and detects the temperature of air that has passed through the heat exchanger 10 in the supply air passage B1.
- the temperature detector 11 is not limited to this, and the temperature detector 11 is arranged in the exhaust air passage B2 and detects the temperature of the air that has passed through the heat exchanger 10 in the exhaust air passage B2, as shown in FIG. May be.
- the temperature detector 11 is used for detecting frost formation on the heat exchanger 10.
- the heat exchanger 10 may be cooled to 0 ° C. or less by the outdoor air OA.
- the temperature of the heat exchanger 10 is usually lower than the dew point of the room air RA.
- this indoor air RA flows into the heat exchanger 10
- water vapor contained in the indoor air RA adheres to the surface of the cooled member of the heat exchanger 10 as frost.
- the frost adhering to the heat exchanger 10 grows, the exhaust air path B2 in the heat exchanger 10 will become narrow.
- the ventilation air volume of the ventilator 100 becomes small, and the ventilator 100 cannot maintain the ventilation air volume required for keeping the indoor space A1 in a comfortable state. Further, the amount of heat recovered by the heat exchanger 10 is reduced.
- FIG. 5 shows an example of state changes of the outdoor air OA, the supply air SA, the indoor air RA, and the exhaust air EA when the amount of heat recovered by the heat exchanger 10 is reduced in winter.
- the amount of recovered heat when the amount of recovered heat is reduced, the amount of change in the state from the outdoor air OA to the supply air SA and the change from the indoor air RA to the exhaust air EA, compared to the example shown in FIG.
- the amount of change in the state becomes smaller. That is, compared with the case where frost does not adhere to the heat exchanger 10, the temperature of the supply air SA that has passed through the heat exchanger 10 in the supply air passage B1 becomes higher, and the heat exchanger in the exhaust air passage B2.
- the temperature of the exhaust air EA that has passed through 10 becomes lower. In other words, when frost adheres to the heat exchanger 10, the temperature detected by the temperature detection unit 11 disposed in the supply air passage B1 is lowered.
- the arithmetic circuit of the temperature detection unit 11 detects frost formation of the heat exchanger 10 by determining whether or not the detected temperature is lower than a preset first threshold value. And the temperature detection part 11 outputs the signal which shows the frost formation of the heat exchanger 10 to the defrosting part 12, when the frost formation of the heat exchanger 10 is detected. Moreover, the temperature detection part 11 will stop the output of the signal to the defrosting part 12, if the frost formation of the heat exchanger 10 will no longer be detected.
- the defrosting part 12 is arrange
- the defrosting part 12 which concerns on this Embodiment is comprised including the heater for heating air, and changes the state of air by heating air.
- the heater of the defrosting part 12 is a gas heater, an electric heater, or a heat pump apparatus, for example. In FIG. 2, a cross section of the gas conduit in the gas heater is shown as the defrosting section 12.
- the defrosting unit 12 receives a signal output from the temperature detection unit 11 when frost adheres to the heat exchanger 10 and the temperature detected by the temperature detection unit 11 is below the first threshold, The outdoor air OA flowing into the supply air passage B1 is heated. The air heated by the defrosting unit 12 flows into the heat exchanger 10 and raises the temperature of the heat exchanger 10. When the temperature of the heat exchanger 10 rises, frost adhering to the heat exchanger 10 is melted, so that the heat exchanger 10 is defrosted.
- the temperature detection part 11 when the temperature detection part 11 is arrange
- the arithmetic circuit of the temperature detector 11 detects frost formation on the heat exchanger 10 by determining whether or not the detected temperature exceeds a predetermined second threshold value.
- the defrosting part 12 receives the signal output from the temperature detection part 11, when the frost adheres to the heat exchanger 10, and the temperature detected by the temperature detection part 11 exceeds the 2nd threshold value. Then, the outdoor air OA flowing into the supply air passage B1 is heated.
- the ventilation device 100 may have both the temperature detection unit 11 disposed in the supply air passage B1 and the temperature detection unit 11 disposed in the exhaust air passage B2.
- the defrosting unit 12 has frost attached to the heat exchanger 10 and the temperature of the supply air passage B1.
- the defrosting operation is performed when the temperature detected by the detection unit 11 is below the first threshold and the temperature detected by the temperature detection unit 11 of the exhaust air passage B2 exceeds the second threshold. .
- the ventilator 100 determines whether or not frost is attached to the heat exchanger 10 (step S1). Specifically, the arithmetic circuit of the temperature detection unit 11 determines whether or not the detected temperature is below the first threshold value. In addition, when the temperature detection part 11 is arrange
- step S1; No When it is determined that frost is not attached to the heat exchanger 10 (step S1; No), the ventilator 100 repeats the determination of step S1. On the other hand, when it determines with the frost adhering to the heat exchanger 10 (step S1; Yes), the ventilator 100 starts a defrost operation (step S2). Specifically, the defrosting unit 12 heats the air that has flowed into the supply air passage B ⁇ b> 1 in accordance with a signal output from the temperature detection unit 11.
- the ventilation device 100 determines whether or not the frost attached to the heat exchanger 10 has been removed (step S3). Specifically, the arithmetic circuit of the temperature detection unit 11 determines whether or not the detected temperature is equal to or higher than the first threshold value.
- step S3 If it is determined that the frost has not been removed (step S3; No), the ventilator 100 repeats the determination in step S3. On the other hand, when it determines with the frost having been removed (step S3; Yes), the ventilator 100 complete
- the defrosting unit 12 changes the state of the air by heating the air flowing into the supply air passage B ⁇ b> 1 to change the heat exchanger 10. Defrost. Thereby, defrosting can be performed without reducing the ventilation air volume. As a result, a comfortable air environment including conditions typified by CO2 concentration can be maintained in the indoor space A1, and the heat load of the indoor space A1 can be reduced to improve energy use efficiency.
- ventilating apparatus 100 differs from that according to Embodiment 1 in that it includes a light intensity detection unit 11 b instead of temperature detection unit 11. Yes.
- the light intensity detector 11b includes a light source typified by an LED, a light receiving element, and an arithmetic circuit, and is disposed in the exhaust air passage B2.
- the light intensity detector 11b irradiates the heat exchanger 10 with light, receives the reflected light from the heat exchanger 10, and detects the intensity of the reflected light.
- frost adheres to the heat exchanger 10
- the amount of the reflected light increases, so that the intensity of the reflected light detected by the light intensity detector 11b increases.
- the light intensity detector 11b detects frost formation on the heat exchanger 10 by determining whether or not the detected light intensity exceeds a predetermined third threshold value. And the light intensity detection part 11b outputs the signal which shows the frost formation of the heat exchanger 10 to the defrosting part 12, when the frost formation of the heat exchanger 10 is detected. Thereby, the frost formation of the heat exchanger 10 can be detected directly, and the heat exchanger 10 can be defrosted.
- ventilating apparatus 100 is different from that according to Embodiment 1 in that it includes temperature detection unit 13 and state detection units 14 and 15.
- the temperature detection unit 13 includes a temperature sensor and is disposed between the defrosting unit 12 and the heat exchanger 10. The temperature detection unit 13 detects the temperature of the air heated by the defrosting unit 12 and notifies the defrosting unit 12 of the detection result.
- the state detection unit 14 detects the state of indoor air and notifies the defrosting unit 12 of the detection result. Moreover, the state detection part 15 detects the state of outdoor air, and notifies a defrosting part 12 of a detection result.
- Each of the state detection units 14 and 15 according to the present embodiment measures the indoor and outdoor air temperatures and notifies the defrosting unit 12 of the measurement result.
- the defrosting unit 12 includes a feedback circuit. And the defrosting part 12 increases / decreases a heating amount so that the temperature detected by the temperature detection part 13 may approach predetermined target temperature, when heating air. That is, the defrosting part 12 heats air and adjusts the temperature detected by the temperature detection part 13 to the predetermined target temperature.
- the target temperature is determined in advance according to the indoor and outdoor air conditions detected by the state detectors 14 and 15. For example, when the temperature of at least one of the indoor air RA and the outdoor air OA is higher than the fourth threshold value, the target temperature set when the temperatures of both the indoor air RA and the outdoor air OA are lower than the fourth threshold value. A lower temperature is set as the target temperature.
- the defrosting part 12 can perform suitable heating according to the state of an indoor or outdoor. For example, excessive energy consumption by the defrosting unit 12 can be avoided.
- the air state detected by the state detection units 14 and 15 is not limited to temperature, and may include humidity. Further, the ventilation device 100 may be configured by omitting one of the state detection units 14 and 15.
- FIG. 9 the fourth embodiment will be described focusing on the differences from the first embodiment.
- ventilating apparatus 100 according to the present embodiment is different from that according to Embodiment 1 in that defrosting section 12 is arranged in exhaust air passage B2.
- the defrosting unit 12 defrosts the heat exchanger 10 by changing the state of the air by heating the air flowing into the exhaust air passage B2. Specifically, the defrosting part 12 heats the indoor air RA which flowed into the exhaust air path B2. The air heated by the defrosting unit 12 flows into the heat exchanger 10 and raises the temperature of the heat exchanger 10. Thereby, defrosting of the heat exchanger 10 is performed.
- ventilation apparatus 100 may be comprised including the temperature detection part 13 and the state detection parts 14 and 15 similar to Embodiment 3, as FIG. 10 shows.
- ventilation device 100 may include light intensity detection unit 11b similar to that of the second embodiment, instead of temperature detection unit 11.
- Embodiment 5 FIG. Next, the fifth embodiment will be described focusing on the differences from the first embodiment described above. In addition, about the structure which is the same as that of the said Embodiment 1, or equivalent, while using an equivalent code
- the defrosting unit 12b includes a rotary adsorption member that adsorbs moisture contained in the air, and is disposed inside the ventilation device 100.
- the defrosting unit 12 b rotates the adsorption member to perform the defrosting operation.
- the defrosting part 12b defrosts the heat exchanger 10 by changing the state of the room air RA by adsorbing moisture contained in the room air RA flowing into the exhaust air passage B2.
- FIG. 12 shows an example of air state change when the defrosting unit 12b performs the defrosting operation.
- “OA2” shown in FIGS. 11 and 12 indicates the air before passing through the heat exchanger 10 in the supply air passage B1 and passing through the adsorption member of the defrosting unit 12.
- “RA2” in the figure indicates the state of the air before passing through the heat exchanger 10 after passing through the adsorption member of the defrosting section 12 in the exhaust air passage B2.
- the defrosting unit 12b may change the state of the air flowing into the exhaust air passage B2 by continuing the rotation of the adsorption member even after the frost is removed from the heat exchanger 10. If the rotation continues, the air having a lower humidity than the room air RA flows into the heat exchanger 10, thereby preventing frost formation on the heat exchanger 10. Moreover, the defrosting part 12b may defrost the heat exchanger 10 by changing the state of the outdoor air OA by adsorbing moisture contained in the outdoor air OA flowing into the supply air passage B1.
- the temperature detection unit 11 and the light intensity detection unit 11b notify the defrosting units 12 and 12b of the detected temperature and light intensity, and the arithmetic circuit built in the defrosting units 12 and 12b performs a determination process using a threshold value. It may be executed to detect frost formation on the heat exchanger 10.
- the heat exchanger 10 may be a stationary type or a rotary type.
- the first threshold value and the second threshold value may be determined according to the state of air in at least one of the outdoor and indoor areas.
- the heating unit 16 in the supply air passage B1 may be added to the configuration of the ventilation device 100 according to each of the first, fourth, and fifth embodiments.
- the heating unit 16 includes, for example, a gas heater, an electric heater, or a heat pump device, and heats the air in the supply air path B1. Thereby, supply air SA is heated and the thermal load of indoor space A1 falls.
- the present invention is suitable for defrosting a heat exchanger constituting a ventilation device.
- 1000 air conditioning system 100 ventilator, 10 heat exchanger, 11, 13 temperature detection unit, 11b light intensity detection unit, 12, 12b defrosting unit, 14, 15 state detection unit, 16 heating unit, 21 air supply blower, 22 Exhaust fan, 300 Temperature / humidity control system, 31 Outdoor unit, 32-34 indoor unit, A1 indoor space, B1 supply air path, B2 exhaust air path.
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Abstract
Description
図1には、実施の形態1に係る空調システム1000の構成が示されている。空調システム1000は、空調対象の室内空間A1内の空気の状態を調和するシステムである。室内空間A1は、例えば、住宅内の部屋、オフィスのフロア、工場内の作業場、倉庫、通路、乗物内の空間又は地下空間である。以下では、室内空間A1の内部を単に室内といい、室内空間A1の外部を単に室外という。なお、室外は、風雨にさらされる自然の空間であってもよいし、建築物の内部の空間であってもよい。
続いて、実施の形態2について、上述の実施の形態1との相違点を中心に説明する。なお、上記実施の形態1と同一又は同等の構成については、同等の符号を用いるとともに、その説明を省略又は簡略する。本実施の形態に係る換気装置100は、図7に示されるように、温度検知部11に代えて、光強度検知部11bを有している点で、実施の形態1に係るものと異なっている。
続いて、実施の形態3について、上述の実施の形態1との相違点を中心に説明する。なお、上記実施の形態1と同一又は同等の構成については、同等の符号を用いるとともに、その説明を省略又は簡略する。本実施の形態に係る換気装置100は、図8に示されるように、温度検知部13と状態検出部14,15を有している点で、実施の形態1に係るものと異なっている。
続いて、実施の形態4について、上述の実施の形態1との相違点を中心に説明する。なお、上記実施の形態1と同一又は同等の構成については、同等の符号を用いるとともに、その説明を省略又は簡略する。本実施の形態に係る換気装置100は、図9に示されるように、除霜部12が排気風路B2に配置される点で、実施の形態1に係るものと異なっている。
続いて、実施の形態5について、上述の実施の形態1との相違点を中心に説明する。なお、上記実施の形態1と同一又は同等の構成については、同等の符号を用いるとともに、その説明を省略又は簡略する。本実施の形態に係る換気装置100は、図11に示されるように、除霜部12に代えて、除霜部12bを有している点で、実施の形態1に係るものと異なっている。
Claims (9)
- 室内から室外へ排気するための排気風路と室外から室内へ給気するための給気風路とを有する換気装置であって、
前記排気風路を通る空気と前記給気風路を通る空気との間で熱交換を行う熱交換器と、
前記熱交換器に霜が付着したときに、前記排気風路又は前記給気風路に流入した空気の状態を変化させて前記熱交換器を除霜する除霜手段と、
を備える換気装置。 - 前記除霜手段は、前記排気風路又は前記給気風路に流入した空気を加熱することで空気の状態を変化させる、
請求項1に記載の換気装置。 - 前記除霜手段によって加熱された空気の温度を検知する第1温度検知手段をさらに備え、
前記除霜手段は、前記排気風路又は前記給気風路に流入した空気を加熱することで空気の状態を変化させて、前記第1温度検知手段によって検知される温度を予め定められた温度に調整する、
請求項2に記載の換気装置。 - 室内又は室外の空気の状態を検出する状態検出手段をさらに備え、
前記除霜手段は、前記第1温度検知手段によって検知される温度を、前記状態検出手段によって検出される状態に応じて予め定められた温度に調整する、
請求項3に記載の換気装置。 - 前記除霜手段は、前記排気風路又は前記給気風路に流入した空気に含まれる水分を吸着することで空気の状態を変化させる、
請求項1から4のいずれか一項に記載の換気装置。 - 前記給気風路内で前記熱交換器を通過した空気の温度を検知する第2温度検知手段をさらに備え、
前記除霜手段は、前記熱交換器に霜が付着して前記第2温度検知手段によって検知される温度が第1閾値を下回ったときに、前記排気風路又は前記給気風路に流入した空気の状態を変化させる、
請求項1から5のいずれか一項に記載の換気装置。 - 前記排気風路内で前記熱交換器を通過した空気の温度を検知する第3温度検知手段をさらに備え、
前記除霜手段は、前記熱交換器に霜が付着して前記第3温度検知手段によって検知される温度が第2閾値を超えたときに、前記排気風路又は前記給気風路に流入した空気の状態を変化させる、
請求項1から6のいずれか一項に記載の換気装置。 - 前記熱交換器に光を照射して前記熱交換器からの反射光の強度を検知する光強度検知手段をさらに備え、
前記除霜手段は、前記熱交換器に霜が付着して前記光強度検知手段によって検知される前記反射光の強度が第3閾値を超えたときに、前記排気風路又は前記給気風路に流入した空気の状態を変化させる、
請求項1から7のいずれか一項に記載の換気装置。 - 室内から室外へ排気するための排気風路を通る空気と室外から室内へ給気するための給気風路を通る空気との間で熱交換を行う熱交換器に霜が付着したときに、前記排気風路又は前記給気風路に流入した空気の状態を変化させて前記熱交換器を除霜する除霜方法。
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