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| 两级节流双循环耦合冰箱节能研究 |
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王亚聪1,2, 唐黎明1,2, 邬晗晖1,2, 陈光明1,2, 陈琪1,2
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| (1.浙江省制冷与低温技术重点实验室;2.浙江大学制冷与低温研究所) |
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| 摘要: |
| 双循环耦合冰箱在系统耦合运行时，冷冻循环冷凝压力下降，冷凝器出口制冷剂未完全冷凝，冷藏循环提供的冷量被用来处理未完全冷凝的制冷剂，系统难以发挥设计的节能能力。为解决该问题，本文提出一种两级节流双循环耦合系统，在冷冻冷凝器和耦合过冷器之间添加节流装置，使系统能够发挥相应的节能作用。本文制冷剂选取R600a，在环境温度为25 ℃，冷冻室温度为-18 ℃的条件下，通过Matlab模拟系统实际运行状态并搭建实验装置进行验证。研究结果表明：在设计工况下，系统单独运行和耦合运行均能够保证冰箱稳定运行，同时耦合运行状态的COP比独立运行状态提升约9%。 |
| 关键词: 压缩式制冷循环 双循环耦合 两级节流 冰箱 |
| DOI： |
| 投稿时间：2022-07-07 修订日期：2023-01-18
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| 基金项目:国家自然科学基金(51376156)资助项目。 |
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| Research on Energy Saving of Dual-loop Coupled Refrigerator with Two-stage Throttling |
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| Abstract: |
| When a dual-loop coupled refrigerator operates in a coupled state, the condensation pressure of the freezing loop decreases, such that the refrigerant outlet of the condenser is not completely condensed. Hence, the cooling capacity provided by the freezing loop is used to treat the refrigerant that is not completely condensed. It is therefore difficult for the system to take full advantage of the energy-saving ability of the design. To solve this problem, we propose a dual-loop coupled system with two-stage throttling. By adding a throttling expansion device between the freezing condenser and coupled subcooler, the system can operate stably. In this study, the refrigerant is R600a. Under the conditions of ambient temperature of 25 °C and freezer temperature of ?18 °C, we simulated the operating state of the system using Matlab, which was validated by an experimental device. The research results show that the system can maintain stability in both independent and coupled operations when the system works under the design conditions, and the coefficient of performance (COP) of the coupled operation is approximately 9% higher than that of the independent operation. |
| Key words: compression refrigeration cycle dual-loop coupled two-stage throttling refrigerator |
