科研之友
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摘要
Responding to the applied air-conditioning requirements for electric cars, an experimental bench for the R290 heat pump system with a secondary medium cycle was established. The cooling and heating performances of the system were tested under various working conditions. As the compressor speed increases from 1 800 r/min to 6 600 r/min, the cooling capacity increases from 1 789 to 4 027 W under standard conditions (35 °C), while the COP decreases from 3.65 to 1.82. As the compressor speed increases from 2 700 r/min to 4 500 r/min, the cooling capacity increases from 1 973 to 3 031 W under extremely warm conditions (45 °C), while the COP decreases from 2.10 to 1.88. Under cold conditions (-20 °C), the heating capacity of the system reaches 2 911 W at 6 000 r/min, and the corresponding COP is 1.80. Under extremely cold conditions (-25 °C), the heating capacity reaches 1 685 W at 3 600 r/min, and the COP is 2.16. Meanwhile, the system adopted the form of secondary heat transfer, which improved the safety and reliability. However, compared with the primary circuit, the cooling capacity is attenuated by 300-500 W, and the heating capacity is attenuated by 200-400 W.
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