Summary
A new type of double-flow accumulator was developed,which can automatically adjust the amount of circulating refrigerant on the system of multi-functional air-conditioning / hot-water heater so that the system was more stable and efficient under multi-working modes. Based on the principle of maximum COP, the optimal refrigerant charge of the variable refrigerant flow rate system was determined by experiment for the modes of refrigeration only and both refrigeration and hot water in the summer. The tested results showed the optimal amounts of charge for the two modes were 6.5 kg and 7.5 kg respectively, and its maximum COP were 3.80 and 5.88 respectively when the outdoor temperature was 32 ± 1°C. When the refrigerant charge changes, by controlling the throttle valve, the COP could be close to the case with the optimal refrigerant charge. Moreover, a series of performance parameters, such as COP, the refrigerating capacity, the degree of subcooling and superheat at optimal refrigerant charge, were investigated with the opening degree of the throttle valve. The results show that when refrigerant charge is the same, the COP and the refrigerating capacity of both refrigeration and hot water mode is bigger compared with refrigeration only mode. Experimental results also show that the double throttling accumulator plays an important role in regulating the refrigerant cycle and saving energy.
Details
- Original title: [In Chinese. / En chinois.]
- Record ID : 30020479
- Languages: Chinese
- Source: Journal of Refrigeration - vol. 36 - n. 163
- Publication date: 2015/06
Links
See other articles in this issue (3)
See the source
Indexing
-
Energy-storage VRF air conditioning system.
- Author(s) : MENG J., WU W., TANG H., et al.
- Date : 2015/08
- Languages : Chinese
- Source: Journal of Refrigeration - vol. 36 - n. 164
- Formats : PDF
View record
-
A novel performance model based on capacity uti...
- Author(s) : XIAO H., LIU S., DING Y., ZHENG C. Y., NIU H., WANG B., YANG Z., SHI W.
- Date : 2023/08/21
- Languages : English
- Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
- Formats : PDF
View record
-
Model-free control and automatic staging of var...
- Author(s) : DONG L., LI Y., SALSBURY T. I., et al.
- Date : 2018/07/09
- Languages : English
- Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
View record
-
A variable refrigerant flow (VRF) air-condition...
- Author(s) : CHENG H., MU W., CHENG Y., CHEN H., XING L.
- Date : 2023/08/21
- Languages : English
- Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
- Formats : PDF
View record
-
Fault diagnosis of refrigerant charge based on ...
- Author(s) : LIU J., CHEN H., WANG J., et al.
- Date : 2016/07/11
- Languages : English
- Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
View record