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【Daily Topic】【HVAC Version 20170415】

2017-04-16View Original

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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: There is an 8-cylinder compressor with a cylinder diameter of D=100mm, a piston stroke of S=70mm, and a rotational speed of n=960r/min. The operating conditions are a condensation temperature of tk=30℃ and an evaporation temperature of t0=-15℃; it operates in a saturated cycle, and the refrigerant used is ammonia. Then the volumetric efficiency of that refrigeration compressor is approximately ( ). A.0.53 B.0.63 C.0.73 D.0.83 C

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