CN102889709B - Frequency-conversion multifunctional air-conditioning water heating system - Google Patents
Frequency-conversion multifunctional air-conditioning water heating system Download PDFInfo
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- CN102889709B CN102889709B CN201210352572.7A CN201210352572A CN102889709B CN 102889709 B CN102889709 B CN 102889709B CN 201210352572 A CN201210352572 A CN 201210352572A CN 102889709 B CN102889709 B CN 102889709B
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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]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to a frequency-conversion multifunctional air-conditioning water heating system which comprises an air-conditioning water heating main system, wherein the air-conditioning water heating main system comprises a frequency-conversion compressor, a four-way reversing valve, a main electromagnetic valve, a source side heat exchanger, a source side fan/water pump, an electronic expansion valve component, a use side liquid reservoir, a use side heat exchanger, a gas and liquid separator, a hot water heat exchanger, a hot water side reservoir and a unidirectional valve, wherein the elements are connected with one another through pipelines. The system is characterized in that the matching of the system is designed flexibly and can realize an independent refrigeration function, an independent heating function, an air-conditioning refrigeration full-heat recycling function, an air-conditioning refrigeration part heat recycling function, an independent hot water making function, a heating and hot water making function and the like; the nominal heat exchange capacity of the hot water heat exchanger is only 30 to 70 percent of that of other heat exchangers; the efficiency of making hot water is 10 to 35 percent higher than that of the common heat pump water heater; an aim of saving energy can be fulfilled; and therefore, the frequency-conversion multifunctional air-conditioning water heating system can replace an electric water heater and a gas water heater.
Description
Technical field
the present invention relates to air conditioning and water heating system field, particularly relate to a kind of frequency conversion Multifunctional hot water system for air conditioner.
Background technology
air source heat pump hot water system was accepted in recent years and was approved in household energy-saving domestic.But because the investment payback time exceedes the electric heater, the gas heater market that within 3 years, are difficult to generally capture low price conventionally; On the other hand, along with maturation, the restriction of installing space and the raising of people's living standard of converter technique, increasing user starts purchase multi-evaporator inverter air conditioner and improves the comfortableness of life.
along with the development of business air conditioner hot water technique, people also more and more pay close attention to domestic air conditioning hot water product, but wish that the investment payback time is shorter, such as being shorter than 2.5 years.To sum up consider, just air conditioning and water heating system is had higher requirement.
Summary of the invention
the object of this invention is to provide a kind of frequency conversion Multifunctional hot water system for air conditioner.
for achieving the above object, the technical solution used in the present invention is:
a kind of frequency conversion Multifunctional hot water system for air conditioner, this system comprises air conditioning hot main system, described air conditioning hot main system comprises frequency-changeable compressor, four-way change-over valve, main solenoid valve, source heat exchanger, source blower fan/water pump, electronic expansion valve module, uses side reservoir, uses side heat exchanger, gas-liquid separator, hot water heat exchanger, hot water side reservoir, check valve, element described in each is connected by pipeline
described four-way change-over valve, source heat exchanger, electronic expansion valve module, use side reservoir, use the connection that is in series of side heat exchanger; Described four-way change-over valve is in parallel with main solenoid valve; The outlet of described frequency-changeable compressor is connected with four-way change-over valve, main solenoid valve simultaneously; The entrance of described gas-liquid separator is connected with four-way change-over valve; The outlet of described gas-liquid separator is connected with the entrance of described frequency-changeable compressor; Described hot water heat exchanger, hot water side reservoir, check valve is connected in turn between described main solenoid valve and electronic expansion valve module.
preferably, described four-way change-over valve has first mouth of pipe, second mouth of pipe, the 3rd mouth of pipe and the 4th mouth of pipe,
the outlet of described frequency-changeable compressor is connected to the first described mouth of pipe, described use side heat exchanger is connected to the second described mouth of pipe, described source heat exchanger is connected to the 4th described mouth of pipe, and the entrance of described gas-liquid separator is connected to the 3rd described mouth of pipe.
preferably, described hot water heat exchanger name exchange capability of heat is to use 30 ~ 70% of side heat exchanger name exchange capability of heat.
preferably, the second electric expansion valve that described electronic expansion valve module comprises the first electric expansion valve, is connected with the first described electric expansion valve, described source heat exchanger is connected to the first described electric expansion valve, and the second described electric expansion valve is connected to described use side reservoir.
further preferably, this system also comprises air conditioning hot accessory system, and described air conditioning hot accessory system comprises that cold operation crosses cold accessory system, cold-producing medium balance control accessory system and delivery temperature control accessory system.
described low temperature is crossed cold accessory system and is comprised subcooler, the first magnetic valve and the first capillary, element described in each is connected by pipeline, described subcooler is connected between the first described electric expansion valve, the second electric expansion valve, and described the first magnetic valve, the first capillary are in parallel and are connected with the pipeline between described the first electric expansion valve and subcooler;
described cold-producing medium balance control accessory system comprises the second magnetic valve, the second capillary, and the element described in each is connected by pipeline, and described the second magnetic valve, the second capillary are in parallel and are connected with described main solenoid valve;
described delivery temperature auxiliary control system comprises the 3rd magnetic valve, three capillary, element described in each is connected by pipeline, the 3rd described magnetic valve is connected between described hot water heat exchanger, hot water side reservoir, and described three capillary is connected on the inlet tube of described gas-liquid separator.
further preferably, this system comprises separate refrigeration pattern or defrosting mode, heating mode, separately water heating pattern and full heat recovery mode separately, in the time of described separate refrigeration pattern or defrosting mode, full heat recovery mode stack work, is part heat recovery mode; But described independent heating mode, separately when water heating pattern stack work for heating while water heating pattern.
further preferably, in the time that system refrigerant flows through formation closed circuit from described frequency-changeable compressor, four-way change-over valve, source heat exchanger, the first electric expansion valve, subcooler, the second electric expansion valve, use side reservoir, use side heat exchanger, four-way change-over valve, gas-liquid separator and frequency-changeable compressor successively, be separate refrigeration pattern or defrosting mode.
further preferably, system refrigerant is independent heating mode from described frequency-changeable compressor, four-way change-over valve, use side heat exchanger, use side reservoir, the second electric expansion valve, subcooler, the first electric expansion valve, source heat exchanger, gas-liquid separator, frequency-changeable compressor when flowing through and forming closed circuit successively.
further preferably, in the time that system refrigerant flows through formation closed circuit from described frequency-changeable compressor, main solenoid valve, hot water heat exchanger, hot water side reservoir, check valve, subcooler, the first electric expansion valve, source heat exchanger, four-way change-over valve, gas-liquid separator, frequency-changeable compressor successively, be independent water heating pattern.
further preferably, when system refrigerant is full heat recovery mode from described frequency-changeable compressor, main solenoid valve, hot water heat exchanger, hot water side reservoir, check valve, the second electric expansion valve, use side reservoir, use side heat exchanger, four-way change-over valve, gas-liquid separator, frequency-changeable compressor when flowing through and forming closed circuit successively.
integrated air-conditioning heat pump technology, heat-pump hot-water technology, the converter technique applied of the present invention, has realized convertible frequency air-conditioner and water heater-integrated design.
because technique scheme is used, the present invention compared with prior art has following advantages:
important feature of the present invention is mainly the coupling flexible design of system, can realize separate refrigeration, heat separately, the full recuperation of heat of air conditioner refrigerating, the recuperation of heat of air conditioner refrigerating part, separately water heating, heat the several functions such as water heating, and the nominal exchange capability of heat of hot water heat exchanger is only 30 ~ 70% of other heat exchanger name exchange capability of heat, the Energy Efficiency Ratio ordinary hot pump water heater of water heating exceeds 10 ~ 35%, energy-conservation object can be reached, thereby electric heater, gas heater can be replaced.
Brief description of the drawings
accompanying drawing 1 is structural representation of the present invention.
wherein: 1, frequency-changeable compressor; 2, gas-liquid separator; 3, four-way change-over valve; 30, first mouth of pipe; 31, second mouth of pipe; 32, the 3rd mouth of pipe; 33, the 4th mouth of pipe; 4, main solenoid valve; 5, source heat exchanger; 6, source blower fan/water pump; 7, the first electric expansion valve; 8, subcooler; 9, the second electric expansion valve; 10, use side reservoir; 11, use side heat exchanger; 12, hot water heat exchanger; 13, hot water side reservoir; 14, check valve; 15, the second magnetic valve; 16, the second capillary; 17, the first magnetic valve; 18, the first capillary; 19, the 3rd magnetic valve; 20, three capillary.
Detailed description of the invention
below in conjunction with drawings and Examples, the invention will be further described:
a kind of frequency conversion Multifunctional hot water system for air conditioner as shown in Figure 1, this system comprises air conditioning hot main system and air conditioning hot accessory system, wherein:
air conditioning hot main system comprises frequency-changeable compressor 1, four-way change-over valve 3, main solenoid valve 4, source heat exchanger 5, source blower fan/water pump 6, electronic expansion valve module, uses side reservoir 10, uses side heat exchanger 11, gas-liquid separator 2, hot water heat exchanger 12, hot water side reservoir 13, check valve 14, element described in each is connected by pipeline
four-way change-over valve 3, source heat exchanger 5, electronic expansion valve module, use side reservoir 10, use side heat exchanger 11 connection that is in series; Four-way change-over valve 3 is in parallel with main solenoid valve 4; The outlet of frequency-changeable compressor 1 is connected with four-way change-over valve 3, main solenoid valve 4 simultaneously; The entrance of gas-liquid separator 2 is connected with four-way change-over valve 3; The outlet of gas-liquid separator 2 is connected with the entrance of frequency-changeable compressor 1; Hot water heat exchanger 12, hot water side reservoir 13, check valve 14 are connected in turn between main solenoid valve 4 and electronic expansion valve module.
four-way change-over valve 3 has first mouth of pipe 30, second mouth of pipe 31, the 3rd mouth of pipe 32 and the 4th mouth of pipe 33,
the outlet of frequency-changeable compressor 1 is connected to first mouth of pipe 30, uses side heat exchanger 11 to be connected to second mouth of pipe 31, and source heat exchanger 5 is connected to the 4th mouth of pipe 33, and the entrance of gas-liquid separator 2 is connected to the 3rd mouth of pipe 32.
the nominal exchange capability of heat that hot water heat exchanger 12 designs just uses 30 ~ 70% of side heat exchanger 11 nominal exchange capability of heat, and when water heating, 1 of frequency-changeable compressor need move under lower frequency, and when operation, load is little; Thereby the cost of hot water heat exchanger 12 is by the half left and right that is conventional design.
except cost is low, because source heat exchanger 5, blower fan/water pump 6 are for realizing the design of air-conditioning ability, when the 1 lower frequency operation of water heating pattern frequency-changeable compressor, source heat exchanger 5, blower fan/water pump 6 are in fully loaded ability operation, the annual water heating efficiency of unit COP will be higher by 10 ~ 35% than conventional products, can be user and save more operating costs.
using side heat exchanger 11 can be hot and cold water heat exchanger, can be also cold-hot wind heat exchanger.
in the present embodiment: the second electric expansion valve 9 that electronic expansion valve module comprises the first electric expansion valve 7, is connected with the first electric expansion valve 7, source heat exchanger 5 is connected to the first electric expansion valve 7, the second electric expansion valves 9 and is connected to use side reservoir 10.
air conditioning hot accessory system comprises that cold operation crosses cold accessory system, cold-producing medium balance control accessory system and delivery temperature control accessory system,
low temperature is crossed cold accessory system and is comprised subcooler 8, the first magnetic valve 17 and the first capillary 18, each element is connected by pipeline, subcooler 8 is connected between the first electric expansion valve 7, the second electric expansion valve 9, and the first magnetic valve 17, the first capillary 18 are in parallel and are connected with the pipeline between the first electric expansion valve 7 and subcooler 8;
cold-producing medium balance control accessory system comprises the second magnetic valve 15, the second capillary 16, and each element is connected by pipeline, and the second magnetic valve 15, the second capillary 16 are in parallel and are connected with main solenoid valve 4;
delivery temperature auxiliary control system comprises the 3rd magnetic valve 19, three capillary 20, each element is connected by pipeline, the 3rd magnetic valve 19 is connected between hot water heat exchanger 12, hot water side reservoir 13, and three capillary 20 is connected on the inlet tube of gas-liquid separator 2.
the concrete various mode of operations of setting forth system in lower the present embodiment below:
1, separate refrigeration pattern or defrosting mode:
when system refrigerant successively from frequency-changeable compressor 1, four-way change-over valve 3, source heat exchanger 5, the first electric expansion valve 7, subcooler 8, the second electric expansion valve 9, use side reservoir 10, while using side heat exchanger 11, four-way change-over valve 3, gas-liquid separator 2 and frequency-changeable compressor 1 to flow through to form closed circuit for separate refrigeration pattern or defrosting mode do not need defrosting mode during for water source when source.
when separate refrigeration pattern, source blower fan/water pump 6 normally moves; The first electric expansion valve 7 automatically adjusts (scheme one) or standard-sized sheet (scheme two) according to control system demand; The second electric expansion valve 9 standard-sized sheets (scheme one) or according to control system demand automatically adjust (scheme two); The first magnetic valve 17, the second magnetic valve 15, the 3rd magnetic valve 19 power-off are closed; Hot water heat exchanger 12 is not worked; Four-way change-over valve 3, main solenoid valve 4 all must not be electric;
2, independent heating mode:
when system refrigerant is independent heating mode from frequency-changeable compressor 1, four-way change-over valve 3, use side heat exchanger 11, use side reservoir 10, the second electric expansion valve 9, subcooler 8, the first electric expansion valve 7, source heat exchanger 5, gas-liquid separator 2, frequency-changeable compressor 1 when flowing through and forming closed circuit successively.
when independent heating mode, source blower fan/water pump 6 normally moves; The second electric expansion valve 9 standard-sized sheets; The first electric expansion valve 7 automatically adjusts according to control system demand; The first magnetic valve 17 is switched on or power-off automatically according to system requirements; Main solenoid valve 4, the 3rd magnetic valve 19 power-off are closed; Hot water heat exchanger 12 is not worked; Four-way change-over valve 3 obtains electric commutation; The second magnetic valve 15 is in compressor start power-off after 3 ~ 10 minutes.
3, independent water heating pattern:
in the time that system refrigerant flows through formation closed circuit from frequency-changeable compressor 1, main solenoid valve 4, hot water heat exchanger 12, hot water side reservoir 13, check valve 14, subcooler 8, the first electric expansion valve 7, source heat exchanger 5, four-way change-over valve 3, gas-liquid separator 2, frequency-changeable compressor 1 successively, it is independent water heating pattern.
when independent water heating pattern, source blower fan/water pump 6 normally moves; Main solenoid valve 4 obtains electric-opening; Use side heat exchanger 11 not work; The second electric expansion valve 9 critical closings; Subcooler 8 and the first magnetic valve 17 are switched on automatically according to system requirements or power-off determines whether to need heat exchange; The first electric expansion valve 7 automatically adjusts according to control system demand; The second magnetic valve 15 power-off are closed; The 3rd magnetic valve 19 is switched on or power-off automatically according to system requirements; Four-way change-over valve 3 obtains electric commutation.
4, full heat recovery mode:
when system refrigerant is full heat recovery mode from frequency-changeable compressor 1, main solenoid valve 4, hot water heat exchanger 12, hot water side reservoir 13, check valve 14, the second electric expansion valve 9, use side reservoir 10, use side heat exchanger 11, four-way change-over valve 3, gas-liquid separator 2, frequency-changeable compressor 1 when flowing through and forming closed circuit successively.
when full heat recovery mode, source heat exchanger 5, source blower fan/water pump 6 are not worked; Main solenoid valve 4 obtains electric-opening; The micro-critical closing of the first electric expansion valve 7; Subcooler 8 and the first magnetic valve 17 power-off are closed; The second electric expansion valve 9 automatically adjusts according to control system demand; The second magnetic valve 15 power-off are closed; The 3rd magnetic valve 19 is switched on or power-off automatically according to system requirements; Four-way change-over valve 3 must not electricity.
5, part heat recovery mode
in the time of separate refrigeration pattern and full heat recovery mode stack work, can realize part heat recovery mode, to meet room refrigeration demand completely;
when part heat recovery mode, source blower fan/water pump 6 normally moves; The first electric expansion valve 7 standard-sized sheets; The second electric expansion valve 9 automatically adjusts according to control system demand; The first magnetic valve 17, the second magnetic valve 15 power-off are closed; Hot water heat exchanger 12 is worked; Four-way change-over valve 3 must not be electric; Main solenoid valve 4 obtains electric-opening; The 3rd magnetic valve 19 is switched on or power-off automatically according to system requirements.
6, heat water heating pattern
when independent heating mode is during with independent water heating pattern stack work, can realize the water heating pattern simultaneously that heats, demand meeting air-conditioning heating and water heating when.
while heating water heating pattern, source blower fan/water pump 6 normally moves; The second electric expansion valve 9 standard-sized sheets; The first electric expansion valve 7 automatically adjusts according to control system demand; The first magnetic valve 17 is switched on or power-off automatically according to system requirements; Main solenoid valve 4 obtains electric-opening; The 3rd magnetic valve 19 is switched on or power-off automatically according to system requirements; Hot water heat exchanger 12 is worked; Four-way change-over valve 3 obtains electric commutation; The second magnetic valve 15 power-off are closed.
above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (7)
1. a frequency conversion Multifunctional hot water system for air conditioner, it is characterized in that: this system comprises air conditioning hot main system, described air conditioning hot main system comprises frequency-changeable compressor (1), four-way change-over valve (3), main solenoid valve (4), source heat exchanger (5), source blower fan/water pump (6), electronic expansion valve module, uses side reservoir (10), uses side heat exchanger (11), gas-liquid separator (2), hot water heat exchanger (12), hot water side reservoir (13), check valve (14), element described in each is connected by pipeline
Described four-way change-over valve (3), source heat exchanger (5), electronic expansion valve module, use side reservoir (10), use side heat exchanger (11) connection that is in series; Described four-way change-over valve (3) is in parallel with main solenoid valve (4); The outlet of described frequency-changeable compressor (1) is connected with four-way change-over valve (3), main solenoid valve (4) simultaneously; The entrance of described gas-liquid separator (2) is connected with four-way change-over valve (3); The outlet of described gas-liquid separator (2) is connected with the entrance of described frequency-changeable compressor (1); Described hot water heat exchanger (12), hot water side reservoir (13), check valve (14) is connected in turn between described main solenoid valve (4) and electronic expansion valve module, the second electric expansion valve (9) that described electronic expansion valve module comprises the first electric expansion valve (7), is connected with described the first electric expansion valve (7), described source heat exchanger (5) is connected to described the first electric expansion valve (7), and described the second electric expansion valve (9) is connected to described use side reservoir (10);
This system also comprises air conditioning hot accessory system, and described air conditioning hot accessory system comprises that cold operation crosses cold accessory system, cold-producing medium balance control accessory system and delivery temperature control accessory system,
Described cold operation is crossed cold accessory system and is comprised subcooler (8), the first magnetic valve (17) and the first capillary (18), element described in each is connected by pipeline, described subcooler (8) is connected to described the first electric expansion valve (7), between the second electric expansion valve (9), described the first magnetic valve (17), after the first capillary (18) series connection, be connected between described the first electric expansion valve (7) and subcooler (8), described the first capillary (18) is connected to the entrance of described gas-liquid separator (2) by described subcooler (8),
Described cold-producing medium balance control accessory system comprises the second magnetic valve (15), the second capillary (16), element described in each is connected by pipeline, and described the second magnetic valve (15), the second capillary (16) are in parallel and are connected with described main solenoid valve (4);
Described delivery temperature control accessory system comprises the 3rd magnetic valve (19), three capillary (20), element described in each is connected by pipeline, the 3rd described magnetic valve (19) is connected between described hot water heat exchanger (12), hot water side reservoir (13), and described three capillary (20) is connected on the inlet tube of described gas-liquid separator (2).
2. frequency conversion Multifunctional hot water system for air conditioner according to claim 1, is characterized in that: the described nominal exchange capability of heat of hot water heat exchanger (12) is for using 30 ~ 70% of the nominal exchange capability of heat of side heat exchanger (11).
3. frequency conversion Multifunctional hot water system for air conditioner according to claim 1, it is characterized in that: this system comprises separate refrigeration pattern or defrosting mode, heating mode, separately water heating pattern and full heat recovery mode separately, be part heat recovery mode in the time of described separate refrigeration pattern or defrosting mode, full heat recovery mode stack work; When described independent heating mode, separately when water heating pattern stack work for heating while water heating pattern.
4. frequency conversion Multifunctional hot water system for air conditioner according to claim 3, is characterized in that: in the time that system refrigerant flows through formation closed circuit from described frequency-changeable compressor (1), four-way change-over valve (3), source heat exchanger (5), the first electric expansion valve (7), subcooler (8), the second electric expansion valve (9), use side reservoir (10), use side heat exchanger (11), four-way change-over valve (3), gas-liquid separator (2) and frequency-changeable compressor (1) successively, be separate refrigeration pattern or defrosting mode.
5. frequency conversion Multifunctional hot water system for air conditioner according to claim 3, is characterized in that: when system refrigerant is independent heating mode from described frequency-changeable compressor (1), four-way change-over valve (3), use side heat exchanger (11), use side reservoir (10), the second electric expansion valve (9), subcooler (8), the first electric expansion valve (7), source heat exchanger (5), four-way change-over valve (3), gas-liquid separator (2), frequency-changeable compressor (1) when flowing through and forming closed circuit successively.
6. frequency conversion Multifunctional hot water system for air conditioner according to claim 3, is characterized in that: in the time that system refrigerant flows through formation closed circuit from described frequency-changeable compressor (1), main solenoid valve (4), hot water heat exchanger (12), hot water side reservoir (13), check valve (14), subcooler (8), the first electric expansion valve (7), source heat exchanger (5), four-way change-over valve (3), gas-liquid separator (2), frequency-changeable compressor (1) successively, be independent water heating pattern.
7. frequency conversion Multifunctional hot water system for air conditioner according to claim 3, is characterized in that: when system refrigerant is full heat recovery mode from described frequency-changeable compressor (1), main solenoid valve (4), hot water heat exchanger (12), hot water side reservoir (13), check valve (14), the second electric expansion valve (9), use side reservoir (10), use side heat exchanger (11), four-way change-over valve (3), gas-liquid separator (2), frequency-changeable compressor (1) when flowing through and forming closed circuit successively.
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| CN201210352572.7A CN102889709B (en) | 2012-09-21 | 2012-09-21 | Frequency-conversion multifunctional air-conditioning water heating system |
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| CN201210352572.7A CN102889709B (en) | 2012-09-21 | 2012-09-21 | Frequency-conversion multifunctional air-conditioning water heating system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111397241A (en) * | 2020-03-30 | 2020-07-10 | 曼茨环境技术(上海)有限公司 | Air source hot water floor heating variable frequency air conditioner device |
| CN112728712B (en) * | 2021-01-21 | 2022-05-06 | 广东美的暖通设备有限公司 | Multi-split air conditioner running capacity detection method, multi-split air conditioner, storage medium and device |
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| CN202902688U (en) * | 2012-09-21 | 2013-04-24 | 特灵空调***(中国)有限公司 | Multifunctional variable frequency air conditioner water heating system |
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- 2012-09-21 CN CN201210352572.7A patent/CN102889709B/en active Active
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| US4482008A (en) * | 1981-04-23 | 1984-11-13 | Mitsubishi Denki Kabushiki Kaisha | Air conditioner operable in a room cooling mode and a room warming mode using either outdoor air or a separate heat source as a source of heat |
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