A hybrid method for refrigerant flow balancing in multi-circuit evaporators: Upstream versus downstream flow control
A hybrid method for refrigerant flow balancing in multi-circuit evaporators: Upstream versus downstream flow control
复制标题
DOI：
10.1016/j.ijrefrig.2009.01.013
复制
发表时间：
2009-09
期刊：
影响因子：
--
通讯作者：
Jun-Hyeung Kim;J. Braun;E. Groll
中科院分区：
文献类型：
--
作者：
Jun-Hyeung Kim;J. Braun;E. Groll
提出了一种用于优化蒸发器中的制冷剂分配的混合方法，该方法涉及在每个回路中使用小平衡阀沿着主膨胀装置来控制来自蒸发器的总制冷剂。流量平衡阀可以位于蒸发器的上游或下游。本文介绍了一项研究的结果，调查这种混合方案的好处，上游和下游的气流平衡的情况下，气流分布不均。为了进行这项调查，开发了一个模拟模型，考虑蒸发器流量分布不均的10.55千瓦住宅R410 A热泵，然后通过比较预测结果与测量验证。仿真结果表明，采用混合-独立解耦控制方法对各回路蒸发器的解耦控制效果显著。此外，上游制冷剂流量控制始终优于下游制冷剂流量控制，并且恢复了由于不均匀的气流分布而导致的冷却能力和COP的大部分损失。
A hybrid method for optimizing refrigerant distribution in evaporators is presented that involves the use of small balancing valves in each circuit along with a primary expansion device to control the overall superheat from the evaporator. The flow balancing valves could be located upstream or downstream of the evaporator. This paper presents the results of a study to investigate the benefits of this hybrid scheme for both upstream and downstream flow balancing for the case of air flow mal-distribution. In order to perform this investigation, a simulation model was developed to consider evaporator flow mal-distributions for a 10.55kW residential R410A heat pump and then validated through comparisons of predicted results with measurements. Simulation results show that there are significant benefits in controlling the superheat of each circuit of evaporators through the hybrid–individual superheat control method. Furthermore, the upstream refrigerant flow control consistently outperforms the downstream refrigerant flow control, and recovers most of the loss in cooling capacity and COP due to non-uniform air flow distribution.