If opening of an expansion valve is

If opening of an expansion valve is decreased without any other changes, the refrigerant mass flow rate is reduced and evaporator pressure becomes lowered. The lowered evaporator pressure enhances heat transfer in evaporator while the reduced mass flow rate suppresses heat transfer. However, the impact of the decreased mass flow rate on the overall heat transfer coefficient becomes relatively small when refrigerant state in evaporator is two-phase state (Heo et al. 2013). This means the temperature difference term in Eq. (9) becomes larger while the overall heat transfer coefficient U does not decrease significantly. As a result, constant cooling capacity controller raises the evaporating pressure by decreasing compressor frequency to maintain the cooling capacity constant and the evaporating temperature does not decrease much.

ผลลัพธ์ (อังกฤษ) 3:

If opening of an expansion valve is decreased without any, other changes the refrigerant mass flow rate is reduced and. Evaporator pressure becomes lowered. The lowered evaporator pressure enhances heat transfer in evaporator while the reduced. Mass flow rate suppresses heat, However transfer.The impact of the decreased mass flow rate on the overall heat transfer coefficient becomes relatively small when refrigerant. State in evaporator is two-phase state (Heo et al. 2013). This means the temperature difference term in Eq. (9 becomes.) Larger while the overall heat transfer coefficient U does not decrease significantly As, a result.Constant cooling capacity controller raises the evaporating pressure by decreasing compressor frequency to maintain the. Cooling capacity constant and the evaporating temperature does not decrease much.
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