间冷冰箱回风道的优化除霜设计

摘要

间冷冰箱蒸发器霜层分布对除霜加热器除霜热量分布的不一致性会导致除霜时间增加和除霜效率的降低，因此，本文提出一种间冷式冰箱回风道的优化除霜设计方法。首先通过实验测量除霜加热器表面温度分布，确定除霜加热器除霜热量分布，进而确定与除霜热量相匹配的蒸发器结霜分布；然后基于蒸发器结霜分布确定回风道出口的最优风量分布；最后基于最优的风量分布设计回风道，使蒸发器上霜层分布与除霜加热器除霜热量分布相一致，达到优化除霜的目的。通过某间冷冰箱回风道的优化设计案例表明，优化后的回风道可实现出口风量分布与除霜加热器除霜热量分布相匹配，除霜时间缩短了38.9％，同时使冰箱的制冷量增加了3.43％。%The non-uniformity of frost distribution on evaporator of indirect cooling refrigerator will increase the defrosting time and de-crease the defrosting efficiency. Therefore, based on the optimization of defrosting this paper proposes an optimization method for return air duct of indirect cooling refrigerator. Firstly, the surface temperature distribution of the defrosting heater is measured through experiments, and the heat distribution of defrosting heater is calculated accordingly, thus the frost distribution on the evaporator that matches the defros-ting heat distribution is obtained. Then the optimal air flow rate distribution of return duct is determined by the frost distribution on the e-vaporator. Finally, the optimal air flow rate distribution is achieved by designing the return air duct of refrigerator compartment to improve the defrosting performance. An optimization case shows that the optimized return air duct can make the air flow rate distribution in accord-ance with the defrosting heat distribution, which decreases the defrosting time by 38. 9%, and increases the cooling capacity of the refrig-erator by 3. 43%.