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The refrigeration performance of the airconditioning system in heavy commercial vehicles is severely constrained by specific driving conditions and the engine compartment layout. The thermalflow field model and AC cooling system model of a heavyduty truck are built using Star CCM+ and AMESim, respectively. The refrigeration performance is analyzed through simulations under hightemperature idling and hightorque climbing conditions. Experimental validation is conducted in an environmental wind tunnel. The effects of compressor speed ratio, condenser inlet air temperature and flow rate, and blower speed on the refrigeration performance are investigated. The simulation results of the air conditioning system are in good agreement with the bench test results, with a maximum error of 4.7%. At 5 000 r/min, the blower can provide an air flow rate of 470 m³/h for the air conditioning duct. Under the idle condition, the average flow rate on the inlet side of the condenser is 2.77 m/s. However, thermal reverse flow in the engine compartment severely affects the COP and the high and low pressures of the air conditioning system. For the optimized and base versions of the Btype vehicle, the system COP decreases by 8.3% and 15.8%, respectively, compared to the Atype vehicle.
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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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