CN205332357U - Machine in two temperature air conditioning - Google Patents
Machine in two temperature air conditioning Download PDFInfo
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- CN205332357U CN205332357U CN201521021799.9U CN201521021799U CN205332357U CN 205332357 U CN205332357 U CN 205332357U CN 201521021799 U CN201521021799 U CN 201521021799U CN 205332357 U CN205332357 U CN 205332357U
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Abstract
The utility model relates to a machine in two temperature air conditioning, its characterized in that: be equipped with at least two group's heat transfer branch roads in the indoor heat exchanger, the one end of indoor heat exchanger is equipped with total liquid pipe, and the entrance point that advances structure and heat transfer branch road through heat exchanger refrigerant branch between total liquid pipe and the indoor heat exchanger links to each other, the other end of indoor heat exchanger be equipped with with the corresponding pipeline of telling of heat exchanger refrigerant reposition of redundant personnel structure, tell the pipeline and link to each other with the exit end of heat transfer branch road respectively, the refrigerant branch advances the structural throttling arrangement of being equipped with. The utility model relates to a have high practicality, easy popularization, high reliability, installation maintenance convenience to have the interior machine of air conditioning of certain temperature humidity independent control characteristics and make full use of indoor set finned heat exchanger heat transfer ability, to a great extent improves air conditioning system's annual comprehensive properties coefficient, realizes the holistic energy saving and consumption reduction by a relatively large margin of air conditioning system.
Description
Technical field
This utility model relates to the technical field of domestic and business air conditioner, and specifically a kind of dual temperature indoor apparatus of air conditioner, particularly relates to the structure that indoor set inner refrigerant carries out tapping in indoor heat exchanger。
Background technology
Currently, air-conditioning has spread to the every aspect of productive life, and in summer, the power consumption of air-conditioning has reached more than the 40% of total power consumption, is genuine big power consumer, and the energy-saving and cost-reducing of air-conditioning has great social and economic significance。
During summer air-conditioning refrigeration, the condensate moisture in air need to, lower than the dew point temperature of room air, so could be got off to be reached for the purpose of indoor air dehumidification by the Tube Sheet of Heat Exchanger temperature of indoor apparatus of air conditioner。Therefore, air-conditioning is when refrigerating operaton, space air is lowered the temperature and dehumidifies and carry out simultaneously, thus there is the demand of cooling and the unmatched situation of demand of dehumidifying, easily there is room air is met cooling demand, but excessively dehumidify, or meet dehumidification, but the situation of excessive drop temperature。For the occasion that space air quality requirements is higher, it is necessary to the air after cool-down dehumidification to be carried out the situation of heating or humidification further。Simultaneously as indoor apparatus of air conditioner need to meet cooling and the demand of dehumidifying simultaneously, its Tube Sheet of Heat Exchanger temperature is accomplished by being set to relatively low, adds the power consumption of air-conditioning。
For solving the problems referred to above, independent temperature-humidity control technology is applied at present to some extent, independent temperature-humidity control technology adopts the mode such as dry coils or radiation refrigeration to meet the cooling demand of room air, and the mode such as solution dehumidification or fresh air dehumidification of employing meets the dehumidification of room air。Independent temperature-humidity control principle can the efficiency of raising air conditioning system by a relatively large margin, but restricted more in actual applications, the interior space is divided to the places such as thinner house, office and promotes more difficult。
Market demand has bigger energy-saving effect and popularization and application are convenient, it is adaptable to the air-conditioning of all kinds of occasions。Namely there is the advantage that existing common air-conditioning is easy to install, the advantage again with independent temperature-humidity control air conditioner energy saving。
The heat exchanger of indoor apparatus of air conditioner in the market is substantially and is made up of the finned heat exchanger coil pipe of two or more rows, and in actual applications, in the face of the first row heat exchanger exchange capability of heat of wind direction is the highest, last row's heat exchanger exchange capability of heat is minimum。For two arrange heat exchangers, before one row heat exchanger heat exchange amount account for the 2/3 of overall heat exchange amount, a row behind heat exchanger heat exchange amount accounts for the 1/3 of overall heat exchange amount。For more plurality of rows of heat exchanger, it is lower at heat exchanger coils exchange capability of heat below, it does not have given play to due effect。
For meeting the requirement of indoor set heat exchanger overall dimensions, in the hypodynamic situation of heat exchanger heat-energy transducer, often it is further added by row's finned heat exchanger coil pipe, the problem thus more exacerbating the waste of finned heat exchanger exchange capability of heat。If the exchange capability of heat of heel row finned heat exchanger can be improved in actual applications, it is possible to energy use efficiency that air-conditioner overall is greatly improved。
Market demand can retain the advantage of the finned heat exchanger of existing common air-conditioning indoor set, can make full use of again the exchange capability of heat of each row's finned heat exchanger simultaneously, improves a kind of indoor apparatus of air conditioner of air-conditioning efficiency。
Summary of the invention
The purpose of this utility model is in that to provide the dual temperature indoor apparatus of air conditioner of a kind of improvement, and it can overcome indoor heat exchanger heat-exchange capacity in prior art low, and heel row radiating tube does not play should effective some shortcomings。
To achieve these goals, the technical solution of the utility model is: a kind of dual temperature indoor apparatus of air conditioner, it mainly includes indoor unit casing and the indoor heat exchanger being located in housing, it is characterized in that: in described indoor heat exchanger, be provided with at least two group heat exchange branch roads, one end of indoor heat exchanger is provided with main liquid tube, the entrance point into structure with heat exchange branch road is divided to be connected by heat exchanger refrigerant between main liquid tube with indoor heat exchanger, the other end of indoor heat exchanger is provided with and corresponding with heat exchanger refrigerant flow dividing structure separates pipeline, separate pipeline to be connected with the port of export of heat exchange branch road respectively；Described cold-producing medium divides and is provided with throttling arrangement into structure。
Further, for the in-room switch adopting cold-producing medium, described cold-producing medium divides and is formed in parallel by 2 separating tubes into structure, and every separating tube is respectively equipped with a throttling arrangement, and described throttling arrangement adopts electric expansion valve；The described pipeline that separates is made up of 2 points of gas branch pipes, and every point of gas branch pipe is respectively equipped with a gas-tpe fitting。
Further, for the indoor heat converter adopting water or other refrigerating medium, described cold-producing medium divides and is made up of two points of inlet pipes into structure, and every point of inlet pipe is respectively equipped with a two-port valve；The described pipeline that separates is separated arm by 2 and forms, and every separates and is respectively equipped with one on arm and goes out pipe joint。
During use, in the refrigerative circle system of air-conditioning refrigerant, it is divided into two-way through outdoor condensed refrigerant liquid, throttle respectively, form the refrigerant air-liquid two phase flow of two-way difference saturation temperature, respectively enter indoor heat exchanger and carry out heat exchange, wherein a road cold-producing medium carries out heat exchange at the part heat exchange branch road of indoor heat exchanger, another road cold-producing medium carries out heat exchange at other heat exchange branch road of indoor heat exchanger, flows back to off-premises station each along different pipelines and complete kind of refrigeration cycle after two-way cold-producing medium outflow heat exchanger respectively。For completing whole kind of refrigeration cycle, it is possible to be that two off-premises stations complete jointly, it is also possible to be that an off-premises station that can run different evaporating temperature individually completes simultaneously。Two off-premises stations complete kind of refrigeration cycle jointly in this way, then 2 separating tubes of indoor set need not divide and are incorporated into together into structure, for 2 independent pipelines。
Therefore, this utility model is a kind of dual temperature indoor apparatus of air conditioner realizing height practicality, when refrigeration, one road refrigerant evaporating temperature is higher, the front row relatively entering indoor heat exchanger carries out heat exchange, the thermic load of primary responsibility indoor sensible heat part, and a road refrigerant evaporating temperature is relatively low, the relative heel row entering indoor heat exchanger carries out heat exchange, the thermic load of primary responsibility indoor latent heat part。Two-way refrigerant heat exchanger is worked in coordination, it is possible to achieve the accurate adjustment to indoor apparatus of air conditioner cooling capacity and dehumidifying effect, it is to avoid the phenomenon of indoor excessive drop temperature or excessively dehumidifying。And owing to wherein a road refrigerant evaporating temperature is higher, decrease compressor power consumption, it is possible to reach good energy-saving and cost-reducing target。
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model one embodiment。
Fig. 2 is the front view of this utility model indoor heat exchanger。
Fig. 3 is the side view of the indoor heat exchanger of this utility model one embodiment。
Fig. 4 is the structural representation that this utility model adopts indoor heat exchanger shown in Fig. 3。
Fig. 5 is the side view of the indoor heat exchanger of the another embodiment of this utility model。
Fig. 6 is the structural representation that this utility model adopts indoor heat exchanger shown in Fig. 5。
Fig. 7 is the structural representation of the another embodiment of this utility model。
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model will be further described。
Each attached graph laplacian is expressed as follows:
1 indoor heat exchanger, 2 main liquid tubes, 3 blower fans, 4 liquid pipe connections, 5 first separating tubes, 6 second separating tubes, 7 first electric expansion valves, 8 second electric expansion valves, 9 first liquid pipes, 10 second liquid pipes, 11 the 3rd liquid pipes, 12 the 4th liquid pipes, 13 first gas-distributing pipes, 14 second gas-distributing pipes, 15 first gas-tpe fittings, 16 second gas-tpe fittings, 17 first bronchus, 18 second bronchus, 19 the 3rd bronchus, 20 the 4th bronchus；
21 first points of inlet pipes, 22 second points of inlet pipes, 23 first two-port valves, 24 second two-port valves, 25 first inlet pipe joints, 26 second inlet pipe joints, 27 first go out pipe joint, 28 second go out pipe joint, 29 first separate pipe, 30 second separate pipe；
31 heat exchanger tubes, 32 bend pipes, 33 finned heat exchangers。
A kind of dual temperature indoor apparatus of air conditioner described in the utility model, it mainly includes indoor unit casing and the indoor heat exchanger being located in housing, its difference with the prior art is in that: be provided with at least two group heat exchange branch roads in described indoor heat exchanger, one end of indoor heat exchanger is provided with main liquid tube, the entrance point into structure with heat exchange branch road is divided to be connected by heat exchanger refrigerant between main liquid tube with indoor heat exchanger, the other end of indoor heat exchanger is provided with and corresponding with heat exchanger refrigerant flow dividing structure separates pipeline, separates pipeline and is connected with the port of export of heat exchange branch road respectively；Described cold-producing medium divides and is provided with throttling arrangement into structure。Being provided with blower fan in housing, described blower fan position is corresponding with the position of indoor heat exchanger。
Preferably, when adopting conventional cold-producing medium, described cold-producing medium divides and is formed in parallel by 2 separating tubes into structure, the front end of main liquid tube is provided with liquid pipe connection, every separating tube is respectively equipped with a throttling arrangement, described throttling arrangement adopts electric expansion valve, in order to control the refrigerant flow between this separating tube and heat exchanger；The described pipeline that separates is made up of 2 gas-distributing pipes, and every gas-distributing pipe is respectively equipped with a gas-tpe fitting。Every separating tube is connected with an one or more liquid pipe respectively, and each liquid pipe is connected with the entrance point of heat exchange branch road respectively。Every gas-distributing pipe is connected with an one or more point gas branch pipe respectively, and each point of gas branch pipe is connected with the port of export of heat exchange branch road respectively。
Preferably, for adopting the indoor heat converter (water circulation described here refers to that employing water or other liquid are as refrigerating medium) of water circulation, described cold-producing medium divides and is substituted by two points of inlet pipes into structure, every point of inlet pipe is respectively equipped with a two-port valve, in order to control breaking or connecting between this point of inlet pipe and heat exchanger；The described pipeline that separates is separated pipe by 2 and forms, and every separates and is respectively equipped with one on pipe and goes out pipe joint。
Described indoor heat exchanger adopts finned heat exchanger, finned heat exchanger is provided with 2-6 and arranges heat exchanging pipe, often row's heat exchanging pipe is provided with 8-60 root heat exchanger tube, and above-mentioned heat exchanger tube is joined end to end by each bend pipe and forms heat exchange branch road, and each heat exchange branch road is provided with an entrance point and a port of export。
As can be seen here, this utility model is a kind of has height practicality, easily popularization, high reliability, convenient for installation and maintenance, and there is certain independent temperature-humidity control feature and make full use of the indoor apparatus of air conditioner of indoor set finned heat exchanger exchange capability of heat, largely improve the annual comprehensive coefficient of performance of air conditioning system, it is achieved by a relatively large margin energy-saving and cost-reducing that air conditioning system is overall。
In enforcement, such as Fig. 1, a kind of dual temperature indoor apparatus of air conditioner, it is made up of main liquid tube, the first separating tube, the second separating tube, the first electric expansion valve, the second electric expansion valve, indoor heat exchanger, blower fan, the first gas-distributing pipe, the second gas-distributing pipe。
For the refrigerant shunting mode of concrete indoor heat exchanger, illustrating for the finned heat exchanger shown in Fig. 2, this finned heat exchanger has front two rows, and often row's finned heat exchanger has 8 heat exchanger tubes。By the connection of elbow, these heat exchanger tubes are four heat exchange branch roads by connection, and these four heat exchange branch roads are staggeredly arranged。
The concrete mode that finned heat exchanger shown in Fig. 2 is connected to indoor set overall can referring to Fig. 4, it is split into two-way by the cold-producing medium of the first separating tube and the first electric expansion valve, entering two heat exchange branch roads of finned heat exchanger coil pipe, cold-producing medium collects to the first gas-distributing pipe after heat exchanger heat exchange。Also being split into two-way by the cold-producing medium of the second separating tube and the second electric expansion valve, enter the another two heat exchange branch road of finned heat exchanger coil pipe, cold-producing medium collects to the second gas-distributing pipe after heat exchanger heat exchange。
These are only example, heat exchanger row can be that 2 to 6 rows are even more in actual applications, and the branch number of the heat exchanger tube radical of heat exchanger and cold-producing medium shunting can be more。
Its key point is in the refrigerative circle system of air-conditioning refrigerant, it is divided into two-way through outdoor condensed refrigerant liquid, throttle respectively, form the refrigerant air-liquid two phase flow of two-way difference saturation temperature, respectively enter indoor heat exchanger and carry out heat exchange, wherein a road cold-producing medium carries out heat exchange at the part heat exchange branch road of indoor heat exchanger, another road cold-producing medium carries out heat exchange at other heat exchange branch road of indoor heat exchanger, flows back to off-premises station each along different pipelines and complete kind of refrigeration cycle after two-way cold-producing medium outflow heat exchanger respectively。For completing whole kind of refrigeration cycle, it is possible to be that two off-premises stations complete jointly, it is also possible to be that an off-premises station that can run different evaporating temperature individually completes simultaneously。Two off-premises stations complete kind of refrigeration cycle jointly in this way, then 2 separating tubes of indoor set need not divide and are incorporated into together into structure, for 2 independent pipelines。
This utility model patent further relates to the indoor heat exchanger shunting form of various ways, specifically example as shown in Figure 5 and Figure 6。Fig. 5 is point air-conditioning indoor heat exchanger side view that arrangement is put before and after a kind of two-way refrigerant heat exchanger coil pipe being suitable for this utility model application。Fig. 6 is point indoor apparatus of air conditioner cold-producing medium that arrangement is put shunting schematic diagram before and after a kind of two-way refrigerant heat exchanger coil pipe adopting this utility model to apply。
By the front and rear row of two-way cold-producing medium is arranged apart, the heat exchange efficiency of heat exchanger for air-conditioner indoor machine can be improved further。When indoor set is in underload refrigerated dehumidification pattern, the evaporating temperature of scalable two-way cold-producing medium, the evaporating temperature by the relatively front-seat refrigerant flow path of blower fan is higher, and the evaporating temperature of relative heel row refrigerant flow path is relatively low。Higher owing to entering relatively front-seat refrigerant evaporating temperature, therefore relatively front-seat indoor heat exchanger is less to the cooling extent of circulation air, therefore improve the heat transfer temperature difference of the indoor heat exchanger of relative heel row, it is effectively increased the exchange capability of heat of the indoor heat exchanger of relative heel row, improve the overall heat exchange efficiency of heat exchanger, it is possible to realize improving the target of system energy efficiency further。
When indoor set is in relatively underload heating mode, the condensation temperature of scalable two-way cold-producing medium, the condensation temperature by the relatively front-seat refrigerant flow path of heat exchanger of blower fan is relatively low, and the condensation temperature of relative heel row refrigerant flow path is of a relatively high。Relatively low owing to entering relatively front-seat refrigerant condensing temperature, therefore relatively front-seat indoor heat exchanger is less to the increasing extent of temperature of circulation air, therefore improve the heat transfer temperature difference of the indoor heat exchanger of relative heel row, it is effectively increased the exchange capability of heat of the indoor heat exchanger of relative heel row, improve the overall heat exchange efficiency of heat exchanger, it is possible to achieve improve the target of system energy efficiency。
Description above and citing are all that the indoor apparatus of air conditioner being cold-producing medium for freon illustrates, and this utility model applies also for using water or other liquid as the indoor apparatus of air conditioner of refrigerating medium, and Fig. 7 is the indoor apparatus of air conditioner structural representation adopted and use water as refrigerating medium。
When being freezed in indoor with water for refrigerating medium, regulating the water temperature of two-way chilled water respectively, wherein a road water temperature is higher, and another road water temperature is relatively low, it may be achieved the effect identical with the indoor apparatus of air conditioner being cold-producing medium with freon。
Whole indoor apparatus of air conditioner can carry out multiple refrigerant heat exchanger mode according to practical situations。
One, common refrigerated dehumidification pattern
When indoor sensible heat load and latent heat load are bigger, the two-way cold-producing medium of indoor apparatus of air conditioner all regulates to relatively low evaporating temperature, its evaporating temperature all regulates to the dew point temperature of room air, and ensure that the Guan Wen of two-way refrigerant heat exchanger pipe is below the dew point temperature of room air, form the indoor heat exchange form similar with general room machine, to ensure that whole indoor apparatus of air conditioner has stronger cooling heat exchange ability and dehumidifying effect。
Two, underload refrigerated dehumidification pattern
When indoor sensible heat load is less, time latent heat load has certain demand, a road cold-producing medium of indoor apparatus of air conditioner regulates to higher evaporating temperature, and its evaporating temperature regulates to the dew point temperature of room air, is mainly used in respective chamber/chambers sensible heat load。Another road cold-producing medium regulates to relatively low evaporating temperature, its evaporating temperature regulates to the dew point temperature of room air, and ensure the Guan Wen dew point temperature lower than room air of this road refrigerant heat exchanger pipe, it is mainly used in meeting indoor latent heat load, and bears the sensible heat load that a part is indoor。The two-way cold-producing medium of indoor set cooperates and passes through to regulate respective evaporating temperature and can realize meeting more accurately sensible heat and the latent heat load demand of whole indoor apparatus of air conditioner, and realizes higher air-conditioning Energy Efficiency Ratio。
Three, simple dehumidification mode
When indoor sensible heat load is less, time latent heat load is bigger, one road cold-producing medium of indoor apparatus of air conditioner is closed, only open a road cold-producing medium, Bing Jiangzhe road cold-producing medium regulates to relatively low evaporating temperature so that the Guan Wen of this road refrigerant heat exchanger pipe dew point temperature lower than room air by a relatively large margin, forms stronger effect on moisture extraction, reduce the integrally cooling amount of indoor apparatus of air conditioner simultaneously, reduce meaningless air conditioner refrigerating consumption。
Four, simple refrigeration mode
When there is certain sensible heat load demand indoor, and latent heat load does not have or only small time, the two-way cold-producing medium of indoor apparatus of air conditioner all regulates to higher evaporating temperature, its evaporating temperature all regulate to the dew point temperature of room air or near, and make the Guan Wen of two-way refrigerant heat exchanger pipe be above the dew point temperature of room air, form the indoor heat exchange form of similar dry-type fan coil, owing to two-way refrigerant evaporating temperature is all higher, it is possible to achieve the Energy Efficiency Ratio that whole air conditioning system is higher。
Five, common heating mode
For indoor heating demand, the two-way cold-producing medium of indoor apparatus of air conditioner all regulates to the condensation temperature normally heated, and forms the indoor heat exchange form similar with general room machine, to ensure that whole indoor apparatus of air conditioner has stronger heating capacity。
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, it is impossible to assert that this utility model is embodied as being confined to these explanations above-mentioned。For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, protection domain of the present utility model all should be considered as belonging to。
Claims (6)
1. a dual temperature indoor apparatus of air conditioner, it mainly includes indoor unit casing and the indoor heat exchanger being located in housing, it is characterized in that: in described indoor heat exchanger, be provided with at least two group heat exchange branch roads, one end of indoor heat exchanger is provided with main liquid tube, the entrance point into structure with heat exchange branch road is divided to be connected by heat exchanger refrigerant between main liquid tube with indoor heat exchanger, the other end of indoor heat exchanger is provided with and corresponding with heat exchanger refrigerant flow dividing structure separates pipeline, separates pipeline and is connected with the port of export of heat exchange branch road respectively；
Described heat exchanger refrigerant divides and is provided with throttling arrangement into structure。
2. a kind of dual temperature indoor apparatus of air conditioner according to claim 1, it is characterised in that: described cold-producing medium divides and is formed in parallel by 2 separating tubes into structure, and every separating tube is respectively equipped with a throttling arrangement, and described throttling arrangement adopts electric expansion valve；
The described pipeline that separates is made up of 2 gas-distributing pipes, and every gas-distributing pipe is respectively equipped with a gas-tpe fitting。
3. a kind of dual temperature indoor apparatus of air conditioner according to claim 1, it is characterised in that: for adopting the indoor heat converter of water circulation, described cold-producing medium divides and is made up of two point inlet pipes into structure, and every is divided and is respectively equipped with a two-port valve on inlet pipe；
The described pipeline that separates is separated pipe by 2 and forms, and every separates and is respectively equipped with one on pipe and goes out pipe joint。
4. a kind of dual temperature indoor apparatus of air conditioner according to claim 2, it is characterised in that: every separating tube is connected with an one or more liquid pipe respectively, and each liquid pipe is connected with the entrance point of heat exchange branch road respectively；
Every gas-distributing pipe is connected with an one or more point gas branch pipe respectively, and each point of gas branch pipe is connected with the port of export of heat exchange branch road respectively。
5. a kind of dual temperature indoor apparatus of air conditioner according to claim 1, it is characterized in that: described indoor heat exchanger adopts finned heat exchanger, finned heat exchanger is provided with 2-6 and arranges heat exchanging pipe, often row's heat exchanging pipe is provided with 8-60 root heat exchanger tube, above-mentioned heat exchanger tube is joined end to end by each bend pipe and forms heat exchange branch road, and each heat exchange branch road is provided with an entrance point and a port of export。
6. a kind of dual temperature indoor apparatus of air conditioner according to claim 1, it is characterised in that: being provided with blower fan in housing, described blower fan position is corresponding with the position of indoor heat exchanger。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521021799.9U CN205332357U (en) | 2015-12-10 | 2015-12-10 | Machine in two temperature air conditioning |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521021799.9U CN205332357U (en) | 2015-12-10 | 2015-12-10 | Machine in two temperature air conditioning |
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| CN205332357U true CN205332357U (en) | 2016-06-22 |
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| CN201521021799.9U Active CN205332357U (en) | 2015-12-10 | 2015-12-10 | Machine in two temperature air conditioning |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949607A (en) * | 2017-04-11 | 2017-07-14 | 广东志高暖通设备股份有限公司 | A kind of air-conditioning, multi-compressor system refrigerant flow and control method |
| CN112178845A (en) * | 2020-09-23 | 2021-01-05 | 珠海格力电器股份有限公司 | Double-evaporation-temperature heat pump air conditioning equipment and control method thereof |
-
2015
- 2015-12-10 CN CN201521021799.9U patent/CN205332357U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949607A (en) * | 2017-04-11 | 2017-07-14 | 广东志高暖通设备股份有限公司 | A kind of air-conditioning, multi-compressor system refrigerant flow and control method |
| CN112178845A (en) * | 2020-09-23 | 2021-01-05 | 珠海格力电器股份有限公司 | Double-evaporation-temperature heat pump air conditioning equipment and control method thereof |
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