Full
Outline
To improve the energy efficiency of new energy vehicle air conditioning systems，educe their heating energy consumption，and lower the global warming potential （GWP） and ozone depletion potential （ODP） of the refrigerant，a performance test system for a new energy vehicle R290 compressor was established.Experimental studies were conducted on the effects of charge amount and system parameters on the oil circulation rate （OCR），and the influence of OCR on the performance of the R290 compressor.The results indicate that the system oil charge amount significantly affects the system OCR，showing an exponential increase.The optimal operating range for OCR is 2% to 10%.For every 10 ℃ decrease in evaporation temperature，the OCR decreases by approximately 3%，while for every 5 ℃ increase in condensation temperature，the OCR decreases by about 1.5%.The condensation temperature has a greater influence on OCR than the evaporation temperature.The cooling capacity increases with higher oil content；the nominal cooling capacity is greater than the actual cooling capacity，and the cooling capacity attenuation rate also increases.At a compressor speed of 3 600 r/min，when the OCR is around 5%，the cooling capacity attenuates by approximately 8.0%，whereas when the OCR is around 10%，the cooling capacity attenuates by about 13.5%，but the actual cooling capacity increases by approximately 3.5%.As the compressor speed increases，the isentropic efficiency increases while the discharge temperature decreases.When the oil circulation rate increases from 5% to 10%，the compressor discharge temperature decreases by about 5 ℃.Appropriately increasing the compressor speed，lubricant charge amount，evaporation temperature，or lowering the condensation temperature is beneficial for improving compressor operating performance and ensuring stable operation.This study provides a reference for the optimal design of new energy vehicle air conditioning systems.
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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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