Full
Outline
Aiming at the problems of poor cooling effect，energy efficiency ratio （EER） and low operational reliability of air source heat pump system under extreme working conditions，a three‑pressure heat pump system was developed and an experimental platform was built.The cooling performance of the single‑stage heat pump system and the three‑pressure heat pump system was compared and analyzed through the experimental research.The results show that with the increase of compressor speed，the cooling capacity of the three‑pressure system is higher than that of the single‑stage system.At 4 500 r/min，the cooling capacity is higher by 9.7%，the EER is higher by 4.72%，and the exhaust temperature of the three‑pressure system is lower by 4.23%.When the outdoor temperature is greater than 43 ℃，the cooling capacity and EER of the three‑pressure system increase compared with that of the single‑stage system.When the outdoor temperature is 43 ℃ and 46 ℃，the cooling capacity of the three‑pressure system increase 26.06% and 37.9%，and the EER increase 8.6% and 20.5%.With the increase of the outdoor temperature，the effect of the three‑pressure system on suppressing the compressor exhaust temperature is more obvious.When the outdoor temperature is 46 ℃，the exhaust temperature is reduced by 12.33%.The research results provide a reference for the application of air source heat pump system in extreme working conditions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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