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[Daily Question] Basic Process Knowledge (Multiple Choice) 20190102

2019-01-02View Original

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The cooling capacity of the refrigeration unit is insufficient, and the suction pressure is high; possible reasons: ① Severe frosting; ②Leak in the expansion valve’s temperature bulb ; ③The insulation layer of the cold storage is damp ; ④There is too much air in the system ; ⑤Insufficient refrigerant ; ⑥Valve leakage; among these, the impossible one is . A. ①②③④ B. ①②③④⑤ C. ②③④⑥ D. ③④⑥ Hint: Conditions that reduce the \"evaporation rate\" of the evaporator will not cause the suction pressure to be high.

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