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首页> 外文期刊>Energy research journal >Mathematical Model of the Optimum Heat Pipe Heat Exchanger for a Condenser of Vapor-Compression Refrigeration Cycle
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Mathematical Model of the Optimum Heat Pipe Heat Exchanger for a Condenser of Vapor-Compression Refrigeration Cycle

机译：蒸汽压缩制冷循环冷凝器最佳热管换热器的数学模型

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Problem statement: This study theoretically investigated applying heat pipe as a heat exchanger in the condenser of vapor compression refrigeration system for sustainable well-being. Split-type air conditioner for residential propose was considered. To reduce pressure drop and recover heat from the condensing process of the refrigeration cycle, this investigation tried to use Closed Loop Oscillating Heat Pipe (CLOHP) instead of the conventional condenser in split-type air conditioner. Approach: The system was single stage with reciprocating compressor which operated at steady state. The refrigerating capacity was 12,500 Btu h-1 and refrigerant was R22. The vapor compression refrigeration system was simulated to determine effect of mass flow rate of refrigerant on various parameters; such as refrigerating capacity, compressor power, heat rejection of condenser and Coefficient of Performance. Results: It was found that, at the normal operating and 3,663 W of the cooling load, mass flow rate of refrigerant, compressor power, heat rejection of condenser and Coefficient of Performance were 0.031 kg sec-1, 1,174 W, 4,837 W and 3.1, respectively. In addition, an increase in evaporating temperature or a decrease in condensing temperature results in increase of refrigerating capacity. CLOHP heat exchanger was simulated to predict optimum sizing on the basis of thermo-economical method. It was found that the optimum sizing of CLOHP heat exchanger with R123 as working fluid were; 0.1 m of evaporator section Length (Le), 0.1 m of condenser section Length (Lc), 2.03 mm of inner Diameter (Di) and 218 turns of number of turn (N). The optimum sizing when water was used as working fluids were 0.1 m of Le, 0.1 m of Lc, 2.03 mm of Di and 176 of N. Finally, the optimum sizing when ethanol was used as working fluids were 0.1 m of Le, 0.1 m of Lc, 2.03 mm of Di and 243 of N. Moreover, net saving of R123, water and ethanol systems at the optimum size were 9,095, 9,117 and 9,082 USD, respectively. Conclusion: The optimum AHE, N, Le, Lc and Di are 0.45 m2, 176 turns, 0.1, 0.1 and 0.00203 m, respectively.
机译：问题陈述：本研究从理论上研究了将热管用作蒸汽压缩制冷系统冷凝器中的换热器，以实现可持续的健康。考虑了住宅用分体式空调。为了减少压降并从制冷循环的冷凝过程中回收热量，本研究试图在分体式空调中使用闭环振荡热管（CLOHP）代替传统的冷凝器。方法：系统为单级，往复式压缩机稳定运行。制冷量为12,500 Btu h-1，制冷剂为R22。模拟了蒸汽压缩制冷系统，以确定制冷剂质量流量对各种参数的影响;例如制冷量，压缩机功率，冷凝器的散热和性能系数。结果：发现在正常运行和3663 W的冷却负载下，制冷剂的质量流量，压缩机功率，冷凝器的散热和性能系数分别为0.031 kg sec-1、1,174 W，4,837 W和3.1 ， 分别。另外，蒸发温度的升高或冷凝温度的降低导致制冷能力的提高。在热经济方法的基础上，模拟了CLOHP热交换器，以预测最佳尺寸。发现以R123为工作液的CLOHP换热器的最佳尺寸为：蒸发器段长度（Le）为0.1 m，冷凝器段长度（Lc）为0.1 m，内径（Di）为2.03 mm，转数（N）为218转。使用水作为工作流体时的最佳尺寸为0.1 m Le，0.1 m的Lc，2.03 mm的Di和176的N。最后，使用乙醇作为工作流体时的最佳尺寸为0.1 m Le，0.1 m Lc，2.03 mm的Di和N的243。此外，最佳尺寸的R123，水和乙醇系统的净节省分别为9,095、9,117和9,082美元。结论：最佳AHE，N，Le，Lc和Di分别为0.45 m2、176转，0.1、0.1和0.00203 m。

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