JPH0311250A - Multi-room air-conditioning equipment - Google Patents
Multi-room air-conditioning equipmentInfo
- Publication number
- JPH0311250A JPH0311250A JP14595189A JP14595189A JPH0311250A JP H0311250 A JPH0311250 A JP H0311250A JP 14595189 A JP14595189 A JP 14595189A JP 14595189 A JP14595189 A JP 14595189A JP H0311250 A JPH0311250 A JP H0311250A
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- degree
- superheat
- heat exchanger
- cycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 12
- 239000003507 refrigerant Substances 0.000 claims abstract description 127
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 description 17
- 230000007423 decrease Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Landscapes
- Other Air-Conditioning Systems (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、多室冷暖房装置の冷媒サイクルの詳しくは、
冷媒漏洩検出に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the refrigerant cycle of a multi-room air-conditioning system.
This relates to refrigerant leak detection.
従来の技術
従来熱源側冷媒サイクルと利用側冷媒サイクルに分離し
両者を補助熱交換器で熱交換する多室冷暖房装置の冷媒
サイクルは、第２図のようになっている０図において１
１は圧縮機、１２は四方弁、１３は熱源側熱交換器、１
４は冷房用減圧装置、１５は暖房用減圧装置、１６は暖
房時に冷房用減圧装置１４を閉成する逆止弁、１７は冷
房時に暖房用減圧装置１５を閉成する逆止弁、１８は第
１補助熱交換器でこれらを環状に連接し、熱源側冷媒サ
イクルを形成している。１９は第２補助熱交換器で第１
補助熱交換器１８と熱交換するように一体に形成されて
いる。２０は冷媒量調整タンクで冷房時と暖房時の冷媒
量を調整している。２１は冷媒搬送装置で冷房時と暖房
時で冷媒の流出方向が反対となる可逆特性を持っており
、これらは室外ユニットｆに収納されている。２２ａ、
２２ｂは利用側熱交換器で室内ユニットｇｙ ｈに収
納され接続配管１＋ ｌ’ ＋ ｊ＋ Ｊ’ で
室外ユニットｆと接続されている。前記第２補助熱交換
器１９と冷媒量調整タンク２０．冷媒搬送装置２１．利
用側熱交換器２２ａ、２２ｂおよび接続配管１゜１’
＋ Ｊ＋ ｊ″を環状に連接し利用側冷媒サイクルを
形成している。2. Description of the Related Art Conventionally, the refrigerant cycle of a multi-room air conditioning system is separated into a heat source side refrigerant cycle and a user side refrigerant cycle, and heat is exchanged between the two using an auxiliary heat exchanger.
1 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 1
4 is a pressure reducing device for cooling, 15 is a pressure reducing device for heating, 16 is a check valve that closes the cooling pressure reducing device 14 during heating, 17 is a check valve that closes the heating pressure reducing device 15 during cooling, and 18 is a check valve that closes the heating pressure reducing device 15 during cooling. These are connected in an annular manner by the first auxiliary heat exchanger to form a heat source side refrigerant cycle. 19 is the second auxiliary heat exchanger
It is integrally formed to exchange heat with the auxiliary heat exchanger 18. 20 is a refrigerant amount adjustment tank that adjusts the amount of refrigerant during cooling and heating. Reference numeral 21 denotes a refrigerant conveying device which has a reversible characteristic such that the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in the outdoor unit f. 22a,
Reference numeral 22b denotes a user-side heat exchanger, which is housed in the indoor unit gyh and connected to the outdoor unit f through connection piping 1+l'+j+J'. The second auxiliary heat exchanger 19 and the refrigerant amount adjustment tank 20. Refrigerant conveyance device 21. Utilization side heat exchangers 22a, 22b and connection piping 1°1'
+J+j'' are connected in an annular manner to form a user-side refrigerant cycle.
以上のように構成された多室冷暖房装置について、その
動作を説明する。The operation of the multi-room heating and cooling system configured as described above will be explained.
冷房運転時には図中実線の冷媒サイクルとなり、熱源側
冷媒サイクルでは、圧縮機１１からの高温高圧ガスは四
方弁１２を通り熱源側熱交換器１３で放熱して凝縮液化
し、逆止弁１６を通って冷房用減圧装置１４で減圧され
第１補助熱交換器１８で蒸発して四方弁１２を通り圧縮
機１１へ循環する。このとき利用側冷媒サイクルの第２
補助熱交換器１９と前記第１補助熱交換器１８が熱交換
し、利用側冷媒サイクル内のガス冷媒は冷却されて液化
し冷媒量調整タンク２０を通って冷媒搬送装置２１に送
られ、この冷媒搬送装置２１よって接続配管ｌ、ｊを通
って利用側熱交換器２２ａ、２２ｂへ送られて吸熱蒸発
し、ガス化して接続配管１’＋Ｊ′を通って第２補助熱
交換器１９に循環＼することになる。During cooling operation, the refrigerant cycle is indicated by the solid line in the figure. In the heat source side refrigerant cycle, high temperature, high pressure gas from the compressor 11 passes through the four-way valve 12, radiates heat in the heat source side heat exchanger 13, condenses and liquefies, and closes the check valve 16. The air is then depressurized in the cooling pressure reducing device 14, evaporated in the first auxiliary heat exchanger 18, and circulated through the four-way valve 12 to the compressor 11. At this time, the second refrigerant cycle of the user side
The auxiliary heat exchanger 19 and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied, and is sent to the refrigerant conveying device 21 through the refrigerant amount adjustment tank 20. The refrigerant is sent to the user-side heat exchangers 22a and 22b through the connection pipes l and j by the refrigerant conveyance device 21, where it is endothermically evaporated, gasified, and circulated through the connection pipes 1'+J' to the second auxiliary heat exchanger 19. ＼I will do it.
一方、暖房運転時においては、図中破線で示す冷媒サイ
クルとなり、熱源側冷媒サイクルでは、圧縮機１１から
の高温高圧冷媒は四方弁１２から第１補助熱交換器１８
に送られ、放熱して凝縮液化し、逆止弁１７から暖房用
減圧装置１５で減圧し、熱源側熱交換器１３で吸熱蒸発
し、四方弁１２を通り圧縮機１１へ循環する。このとき
利用側冷媒サイクルの第２補助熱交換器１９と前記第１
補助熱交換器１８が熱交換し、利用側冷媒サイクル内の
冷媒が加熱されてガス化し、接続配管１′ｊ′を通り利
用側熱交換器２２ａ、２２ｂへ送られて、暖房して放熱
液化し、接続配管１＋ Ｊを通って冷媒搬送装置２１
へ送られ、冷媒量調整タンク２０から第２補助熱交換器
１９へ循環する。On the other hand, during heating operation, the refrigerant cycle is as shown by the broken line in the figure, and in the heat source side refrigerant cycle, the high temperature and high pressure refrigerant from the compressor 11 is transferred from the four-way valve 12 to the first auxiliary heat exchanger 18.
It radiates heat, condenses and liquefies, reduces the pressure through the check valve 17 in the heating pressure reducing device 15, absorbs heat and evaporates in the heat source side heat exchanger 13, and circulates through the four-way valve 12 to the compressor 11. At this time, the second auxiliary heat exchanger 19 of the user side refrigerant cycle and the first
The auxiliary heat exchanger 18 exchanges heat, and the refrigerant in the user-side refrigerant cycle is heated and gasified, and is sent to the user-side heat exchangers 22a and 22b through the connecting pipe 1'j', where it is heated and heat-radiated into liquid. The refrigerant conveying device 21 passes through the connecting pipe 1+J.
The refrigerant is sent to the refrigerant amount adjustment tank 20 and circulated to the second auxiliary heat exchanger 19.
発明が解決しようとする課題
しかしながら上記のような構成では、利用側冷媒サイク
ル内の冷媒が徐々に漏れた場合、ある程度までは、室内
ユニットの能力にあまり影響がないが、ある時点から冷
媒搬送装置に多量のガス冷媒が吸入されるようになり、
冷媒循環量が極端に低下するため室内ユニットの急激な
能力低下となるとともに、冷媒搬送装置の潤滑不良を起
こし冷媒搬送装置を損傷する恐れがあった。Problems to be Solved by the Invention However, with the above configuration, if the refrigerant in the user-side refrigerant cycle gradually leaks, it will not affect the indoor unit's performance to a certain extent, but at some point the refrigerant transport device will start to leak. A large amount of gas refrigerant is now inhaled,
Since the amount of refrigerant circulation is extremely reduced, the capacity of the indoor unit is rapidly reduced, and there is a risk that the refrigerant transport device may be damaged due to poor lubrication of the refrigerant transport device.
本発明は、上記課題に鑑み簡単な構成で利用側冷媒サイ
クルの冷媒漏洩を検出し、冷媒漏洩による冷媒搬送装置
の損傷の恐れのない多室冷暖房装置を提供するものであ
る。In view of the above-mentioned problems, the present invention provides a multi-room air-conditioning system that detects refrigerant leakage in a user-side refrigerant cycle with a simple configuration and is free from damage to a refrigerant transport device due to refrigerant leakage.
課題を解決するための手段
上記課題を解決するために、本発明の多室冷暖房装置は
、熱源側冷媒サイクルと利用側冷媒サイクルとを分離し
、第２補助熱交換器での冷媒の過熱度を検出する過熱度
検出装置と、この過熱度検出装置により検出した過熱度
により利用側冷媒サイクルの冷媒漏洩を検出する冷媒漏
洩検出装置とを備えたものである。Means for Solving the Problems In order to solve the above problems, the multi-room air conditioning system of the present invention separates the heat source side refrigerant cycle and the usage side refrigerant cycle, and adjusts the degree of superheating of the refrigerant in the second auxiliary heat exchanger. The refrigerant leakage detection device includes a superheating degree detection device that detects the superheating degree, and a refrigerant leakage detection device that detects refrigerant leakage from the user-side refrigerant cycle based on the superheating degree detected by the superheating degree detection device.
作用
本発明は上記した構成によって、利用側冷媒サイクルの
第２補助熱交換器の過熱度により制御しているので、利
用側冷媒サイクルの冷媒漏洩を確実に且、事前に検出す
ることが可能となり、制御装置も簡単になるものである
。Function: With the above-described configuration, the present invention controls the degree of superheating of the second auxiliary heat exchanger of the user-side refrigerant cycle, so that refrigerant leakage of the user-side refrigerant cycle can be detected reliably and in advance. This also simplifies the control device.
実施例
以下、本発明の実施例について図面を参照しながら説明
する。EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.
第１図は本発明の実施例における多室冷暖房装置の冷媒
サイクルを示すものである。FIG. 1 shows a refrigerant cycle of a multi-room air conditioning system according to an embodiment of the present invention.
基本構成は第２図の従来例と同一であり、ここでは変わ
っているところだけを説明する。図において、３０は利
用側冷媒サイクルの第２１１１助熱交換器での過熱度を
検出する過熱度検出装置で、３１は過熱度検出装置３０
で検出した過熱度によって利用側冷媒サイクルの冷媒漏
洩の検出を行なう制御装置である。The basic configuration is the same as the conventional example shown in FIG. 2, and only the differences will be explained here. In the figure, 30 is a superheat degree detection device that detects the degree of superheat in the 2111th auxiliary heat exchanger of the utilization side refrigerant cycle, and 31 is a superheat degree detection device 30.
This is a control device that detects refrigerant leakage in the user-side refrigerant cycle based on the degree of superheat detected in the refrigerant cycle.
以上のように構成された冷暖房装置についてその動作を
説明する。The operation of the heating and cooling system configured as described above will be explained.
冷凍サイクルの基本動作については従来例と同一であり
、ここではその相違点、つまり利用側冷媒サイクルの冷
媒漏洩の検出動作について説明する。The basic operation of the refrigeration cycle is the same as that of the conventional example, and here we will explain the difference, that is, the operation of detecting refrigerant leakage in the user-side refrigerant cycle.
冷暖房運転時は、利用側冷媒サイクルの第２補助熱交換
器での過熱度がある一定の過熱度となるように熱源側冷
媒サイクルの能力や冷媒搬送装置２１の能力を制御して
いる。During the cooling/heating operation, the capacity of the heat source side refrigerant cycle and the capacity of the refrigerant transport device 21 are controlled so that the degree of superheating in the second auxiliary heat exchanger of the user side refrigerant cycle becomes a certain constant degree of superheating.
従って、利用側冷媒サイクルの冷媒が漏洩した場合には
、冷房時利用側冷媒サイクルでの熱負荷が同じであれば
、利用側冷媒サイクルを循環する冷媒量は減少するため
利用側熱交換器２２ａ、２２ｂで過熱されることになる
。従って第２補助熱交換器１９の入口では、冷媒は最適
時の過熱度よりも過熱されることになるため、冷媒搬送
波Ｗ２１の能力をアップさせる制御を行なう、この制御
により利用側塗媒サイクルを循環する冷媒量は増加し、
第２補助熱交換器１９の入口での冷媒の過熱度は最適時
の過熱度に制御され、熱負荷に見合った冷房能力を発揮
する。Therefore, if the refrigerant in the user-side refrigerant cycle leaks, if the heat load on the user-side refrigerant cycle during cooling is the same, the amount of refrigerant circulating in the user-side refrigerant cycle will decrease, so the user-side heat exchanger 22a , 22b. Therefore, at the inlet of the second auxiliary heat exchanger 19, the refrigerant will be superheated to a higher degree than the optimum superheating degree, so control is performed to increase the ability of the refrigerant carrier wave W21.This control increases the usage-side coating fluid cycle. The amount of refrigerant circulating increases,
The degree of superheating of the refrigerant at the inlet of the second auxiliary heat exchanger 19 is controlled to the optimum degree of superheating, and a cooling capacity commensurate with the heat load is exhibited.
しかし、冷媒搬送装置２１の能力をアップさせる制御に
も限界が、あるため、冷媒の漏洩量がある程度（例えば
２０〜３０％）を超えると、第２補助熱交換器１９の入
口での冷媒の過熱度は最適時の過熱度に制御しきれなく
なる。However, there are limits to the control to increase the capacity of the refrigerant transfer device 21, so if the amount of refrigerant leakage exceeds a certain level (for example, 20 to 30%), the amount of refrigerant at the inlet of the second auxiliary heat exchanger 19 will be reduced. The degree of superheating cannot be controlled to the optimum degree of superheating.
一方、暖房時も同様に利用側冷媒サイクルの冷媒が漏洩
した場合には、利用側伶媒サイクルを循環する冷媒量は
減少するため第２補助熱交換器１９でＲ遺時の過熱度よ
りろ過熱されることになる。On the other hand, if the refrigerant in the user-side refrigerant cycle leaks during heating as well, the amount of refrigerant circulating in the user-side refrigerant cycle will decrease, so the second auxiliary heat exchanger 19 will filter the refrigerant to reduce the superheat level at the time of R. It will get heated.
このため、冷媒搬送装置２１の能力をアップさせる制御
を行ない、利用側冷媒サイクルを循環する冷媒量を増加
させるため、第２補助熱交換器１９の出口での冷媒の過
熱度は最適時の過熱度に制御されることになり、熱負荷
に見合った暖房能力を発揮する。Therefore, in order to perform control to increase the capacity of the refrigerant transport device 21 and increase the amount of refrigerant circulating in the user-side refrigerant cycle, the degree of superheating of the refrigerant at the outlet of the second auxiliary heat exchanger 19 is adjusted to the optimum level. The heating capacity is controlled according to the heat load.
しかし、冷媒搬送装置２１の能力をアップさせる制御に
も限界があるため、冷媒の漏洩量がある程度（例えば２
０〜３０％）を超えると、第２補助熱交換器１９の出口
での冷媒の過熱度は最適時の過熱度に制御しきれなくな
る。However, since there is a limit to the control to increase the capacity of the refrigerant transport device 21, the amount of refrigerant leakage is limited to a certain extent (for example, 2
0 to 30%), the degree of superheating of the refrigerant at the outlet of the second auxiliary heat exchanger 19 cannot be controlled to the optimum degree of superheating.
この冷媒の過熱度を検出し、検出した過熱度がある値を
超えた場合に、つまり冷媒搬送装置２１へ多量のガス冷
媒（否凝縮冷媒）が流入して冷媒搬送能力が極端に減少
し、冷暖房能力が大きく低下するとともに、冷媒搬送装
置装置２１の軸受部が潤滑不足によって損傷する以前に
異常を表示して冷暖房装置の運転を強制的に停止するも
のである。The degree of superheating of this refrigerant is detected, and when the detected degree of superheating exceeds a certain value, that is, a large amount of gas refrigerant (non-condensing refrigerant) flows into the refrigerant conveyance device 21, and the refrigerant conveyance capacity is extremely reduced. This system displays an abnormality and forcibly stops the operation of the heating and cooling device before the cooling and heating capacity is significantly reduced and the bearing portion of the refrigerant conveyance device 21 is damaged due to lack of lubrication.
以上のように、本実施例によれば、熱源側冷媒サイクル
と利用側冷媒サイクルとを分離し、第２補助熱交換器で
の冷媒の過熱度を検出する過熱度検出装置と、この過熱
度検出装置により検出した過熱度により利用側冷媒サイ
クルの冷媒漏洩を検出する冷媒漏洩検出装置とを備えた
ので、簡単な構成で早期にかつ確実に冷媒漏洩を検出す
ることができることとなり、冷暖房能力の急激な低下や
、冷媒搬送装置の損傷を防止できるものである。As described above, according to the present embodiment, the heat source side refrigerant cycle and the usage side refrigerant cycle are separated, and the superheat degree detection device detects the degree of superheat of the refrigerant in the second auxiliary heat exchanger, and this superheat degree Since it is equipped with a refrigerant leakage detection device that detects refrigerant leakage from the user-side refrigerant cycle based on the degree of superheat detected by the detection device, refrigerant leakage can be detected early and reliably with a simple configuration, and cooling and heating capacity can be reduced. This can prevent a sudden drop and damage to the refrigerant conveyance device.
発明の効果
以上のように本発明は、熱源側冷媒サイクルと利用側冷
媒サイクルとを分離し、第２補助熱交換器での冷媒の過
熱度を検出する過熱度検出装置と、この過熱度検出装置
により検出した過熱度により利用側冷媒サイクルの冷媒
漏洩を検出する冷媒漏洩検出装置とを備えたので、簡単
な構成で、早期にかつ確実に冷媒漏洩を検出し、冷媒搬
送能力の急激な減少による冷暖房能力の極端な低下や、
冷媒搬送装置の軸受部の潤滑不足による損傷を防止でき
る効果がある。Effects of the Invention As described above, the present invention provides a superheat degree detection device that separates a heat source side refrigerant cycle and a usage side refrigerant cycle and detects the degree of superheat of the refrigerant in a second auxiliary heat exchanger, and this superheat degree detection device. Equipped with a refrigerant leakage detection device that detects refrigerant leakage from the user-side refrigerant cycle based on the degree of superheat detected by the device, it has a simple configuration, can detect refrigerant leakage early and reliably, and can prevent sudden decreases in refrigerant transfer capacity. An extreme decrease in heating and cooling capacity due to
This has the effect of preventing damage to the bearing portion of the refrigerant conveyance device due to insufficient lubrication.
第１図は本発明の一実施例による多室冷暖房装置の冷凍
サイクル図、第２図は従来例を示す多室冷暖房装置の冷
凍サイクル図である。
１１・・・・圧縮機、１３・・・・熱源側熱交換器、１
８・・・・第１補助熱交換器、１９・・・・第２補助熱
交換器、２１・・・・冷媒搬送装置、２２ａ、２２ｂ・
・・・利用側熱交換器、３０・・・・過熱度検出装置、
３１・・・・制御装置。FIG. 1 is a refrigeration cycle diagram of a multi-room air conditioning system according to an embodiment of the present invention, and FIG. 2 is a refrigeration cycle diagram of a multi-room air conditioning system that shows a conventional example. 11...Compressor, 13...Heat source side heat exchanger, 1
8...First auxiliary heat exchanger, 19...Second auxiliary heat exchanger, 21...Refrigerant conveyance device, 22a, 22b.
...Using side heat exchanger, 30...Superheat degree detection device,
31...control device.
Claims (1)
補助熱交換器を環状に連接してなる熱源側冷媒サイクル
と、この第１補助熱交換器と一体に形成し熱交換する第
２補助熱交換器と冷媒搬送装置および複数の利用側熱交
換器を有する利用側冷媒サイクルと、前記利用側冷媒サ
イクルの第２補助熱交換器での冷媒の過熱度を検出する
過熱度検出装置と、この過熱度検出装置により検出した
過熱度により利用側冷媒サイクルの冷媒漏洩を検出する
冷媒漏洩検出装置とを備えた多室冷暖房装置。Compressor, four-way valve, heat source side heat exchanger, pressure reducing device and first
A heat source side refrigerant cycle formed by connecting auxiliary heat exchangers in a ring shape, a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat, a refrigerant transport device, and a plurality of user side heat exchangers. a user-side refrigerant cycle having a superheat degree detection device that detects the degree of superheat of the refrigerant in the second auxiliary heat exchanger of the user-side refrigerant cycle; A multi-room air conditioning and heating system equipped with a refrigerant leakage detection device for detecting refrigerant leakage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14595189A JPH0311250A (en) | 1989-06-08 | 1989-06-08 | Multi-room air-conditioning equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14595189A JPH0311250A (en) | 1989-06-08 | 1989-06-08 | Multi-room air-conditioning equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0311250A true JPH0311250A (en) | 1991-01-18 |
Family
ID=15396808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14595189A Pending JPH0311250A (en) | 1989-06-08 | 1989-06-08 | Multi-room air-conditioning equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0311250A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100758902B1 (en) * | 2004-11-23 | 2007-09-14 | 엘지전자 주식회사 | multi type air conditioning system and controlling method of the system |
| CN115789739A (en) * | 2022-11-22 | 2023-03-14 | 舒尔斯德机电科技(浙江)有限公司 | Air source heat pump fluorine circulation ground heating device and control method |
-
1989
- 1989-06-08 JP JP14595189A patent/JPH0311250A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100758902B1 (en) * | 2004-11-23 | 2007-09-14 | 엘지전자 주식회사 | multi type air conditioning system and controlling method of the system |
| CN115789739A (en) * | 2022-11-22 | 2023-03-14 | 舒尔斯德机电科技(浙江)有限公司 | Air source heat pump fluorine circulation ground heating device and control method |
| CN115789739B (en) * | 2022-11-22 | 2023-10-31 | 舒尔斯德机电科技(浙江)有限公司 | Air source heat pump fluorine circulation ground heating device and control method |
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