重力循环柜性能模拟研究与优化改造区  

Simulation Study and Optimisation of Refrigeration Performance of Gravity Cycle Cabinets

作　　者：陈海栋 梁珍[1] 于英娜 Chen Haidong;Liang Zhen;Yu Yingna(School of Environmental Science and Engineering,Donghua University,Shanghai,201620;Kunshan KST Co.,Ltd,Suzhou,215300)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]昆山开思拓空调技术有限公司,苏州215300

出　　处：《制冷与空调(四川)》2025年第1期133-139,146,共8页Refrigeration and Air Conditioning

摘　　要：提出了一种在重力柜两侧增加风机的复合型重力循环柜,其运行模式是在启动阶段和超负荷运行时启动风机,其余时间保持自然对流。基于具体试验数据,建立了重力循环柜的模型,并模拟了其自然对流模式以及在开口处引入一定风量模式的运行性能,发现重力循环柜的换热能力可通过增加机械设备,将自然对流变为强迫对流达到提升换热能力的效果;同时证明强迫对流的改造设计在更高水温下也可以达到自然对流重力柜的制冷效果;也可在较低水温下达到自然对流重力柜的制热效果,增大了重力循环柜的节能潜力,能充分利用自然冷热源。进一步地,通过复合型重力循环柜模拟分析,给出了启动阶段的控制策略。与开口处加风机的重力柜优化进行对比发现,虽然两种设计方案在换热能力提升上基本相同,但复合型重力循环柜仅需在启动阶段和室内负荷超过设计负荷时启动风机,其余时间保持纯自然对流的运行模式,不仅避免了破坏自然对流模式时的气流组织,减少了因凝结水导致的安全隐患,还保留了重力柜原有的优势,如无机械运转部件的长寿命、自然对流的舒适性。A composite gravity circulation cabinet with fan added on both sides of the gravity cabinet is proposed.The operation mode is to start the fan in the start-up stage and overload operation,and maintain natural convection in the rest time.Based on the specific test data,the paper established a gravity circulation cabinet model,simulated its natural convection mode and the operation performance of introducing a certain air volume mode at the opening,and found that the heat transfer capacity of the gravity circulation cabinet could be improved by adding mechanical equipment to change the natural convection into forced convection.At the same time,it is proved that the modified design of forced convection can also achieve the cooling effect of natural convection gravity tank at higher water temperature.It can also achieve the heating effect of natural convection gravity tank at low water temperature,increase the energy saving potential of gravity circulation tank,and make full use of natural cold and heat sources.Further,the paper gives the control strategy of start-up stage through the simulation analysis of compound gravity circulation tank.Compared with the optimization of the gravity cabinet with fan at the opening,it is found that although the two design schemes are basically the same in terms of heat transfer capacity,the composite gravity circulation cabinet only needs to start the fan at the start-up stage and when the indoor load exceeds the design load,and maintains the pure natural convection operation mode for the rest of the time,which not only avoids the airflow organization when the natural convection mode is destroyed.The safety hazards caused by condensate water are reduced,and the original advantages of the gravity tank are retained,such as long life without mechanical moving parts and the comfort of natural convection.

关 键 词：重力循环柜 换热设备 毛细管 CFD 复合型重力循环柜 

分 类 号：TU831.6[建筑科学—供热、供燃气、通风及空调工程]