Abstract:

The adoption of a parallel evaporators for large-capacity refrigerators can control the cabinet air temperature separately.The existing sequential control strategies cause some problems of exceeding the cabinet air temperature up limit and deviating from the set average temperature easily under the dynamic conditions, and a new control strategy is necessary to avoid these problems.The objective of this study is to put forward a new control strategy which switch freezing/refrigerating cycle based on the cooling urgency of cabinet, and the new control strategy is analyzed to find the way to solve the two problems mentioned above under the dynamic conditions.Refrigerator with parallel dual evaporator in the new control strategy and existing three sequential control strategies are simulated numerically, the results show that the new control strategy does not have the problem of exceeding the cabinet air up temperature limit, and the deviation from the set average temperature is less than 0.6 K; the energy-saving effect can reach 8.5%, comparing with the existing sequential control strategies.

Key words: parallel dual evaporator, refrigerator, temperature, control strategy based on temperature priority level, sequential control strategy

摘要：

大容量冰箱需要采用并联双蒸发器分别控制各箱室的温度，现有的顺序控制策略在动态工况下容易导致箱室温度超限和偏离目标平均温度的问题，因此需提出一个新的控制策略。本文提出基于各箱室需要冷量的紧迫级别来进行冷冻/冷藏循环的切换的温度优先级控制策略，并分析该控制策略如何解决在动态工况下箱室温度超限和偏离目标平均温度的问题。对采用新控制策略与现有的顺序控制策略的并联双蒸发器冰箱进行数值仿真研究，结果表明，在新控制策略下不会出现箱室温度超限的问题，且与目标平均温度的偏差均在0.6 K以内；与现有顺序控制策略相比，节能幅度最高达8.5%。

关键词: 并联双蒸发器, 冰箱, 温度, 温度优先级控制策略, 顺序控制策略