Hybrid condenser for split type air conditioner

P. Yeunyongkul, Passawat Watcharadumrongsak, S. Rittidech
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引用次数: 2

Abstract

The aim of this research is to experimentally investigate the application of a hybrid condenser as the condenser for a vapor compression refrigeration system. Split type air conditioner for residential use has two major disadvantages. First, it has a large pressure drop in the condenser caused by the flow of refrigerant inside a small tube which affects compressor power. Second, a large amount of heat is rejected to the surroundings since the refrigerant has to condense after passing through the condenser. To decrease pressure drop and recover heat rejection from the condensing process, this study considered using hybrid condenser instead of the conventional condenser in the split type air conditioner. The refrigeration capacity was set at 12,500 Btu/h (3.663 kW) with R22 as the refrigerant.  The optimum size of the thermosyphon with water as the working fluid consists of 0.1 meter of evaporator section length, 0.1 meter of condenser section length, the thermosyphon with an inner diameter of 6.5 millimeter, and 105 tubes. Therefore, these sizes were selected to construct the hybrid condenser. The experimental results were obtained and compared with the conventional condenser. It was found that temperature difference between ambient and room of the conventional condenser system was 11.5 oC. While thetemperature difference of the hybrid condenser system with water flow rate of 4, 6 and 8 LPM were 15.9, 16.6 and 17.3 oC, respectively. In addition, electric power consumptionof the conventional condenser system was 1,423 W. While theelectric power consumption of the hybrid condenser system with water flow rate of 4, 6 and 8 LPM were 1,315, 1,309 and 1,295 W, respectively. When both systems were compared with the same heat load, it was found that the electric power consumptionof the hybrid condenser system of 4, 6 and 8 LPM were decreased by about 8.2, 8.7 and 9.9%,respectively. Finally, the outlet temperature of the cooling water which recovers heat from the condenser section of the hybrid condenser with the water flow rate of 4, 6 and 8 LPM were 6.6, 8.2 and 9.8oC, respectively.
分体式空调用混合式冷凝器
本研究的目的是对混合式冷凝器在蒸汽压缩制冷系统中的应用进行实验研究。家用分体式空调有两大缺点。首先,它在冷凝器中有较大的压降,这是由小管内制冷剂流动造成的,影响压缩机功率。其次,由于制冷剂在通过冷凝器后必须冷凝,因此大量的热量被排出到周围环境中。为了减小压降和回收冷凝过程中的热量,本研究考虑在分体式空调中使用混合式冷凝器来代替传统的冷凝器。制冷量为12,500 Btu/h (3.663 kW),制冷剂为R22。以水为工质的热虹吸管的最佳尺寸为蒸发器段长0.1 m,冷凝器段长0.1 m,内径6.5 mm的热虹吸管,共105根管。因此,选择这些尺寸来构建混合式冷凝器。得到了实验结果,并与常规冷凝器进行了比较。结果表明,常规冷凝器系统的环境温差与室内温差为11.5℃。而流量为4、6、8 LPM时混合式冷凝器系统的温差分别为15.9、16.6、17.3℃。另外,常规冷凝器系统的耗电量为1423 W。而流量为4、6、8 LPM的混合式冷凝器系统的耗电量分别为1315、1309、1295 W。在热负荷相同的情况下,4、6、8 LPM混合式冷凝器系统的电耗分别降低了约8.2、8.7、9.9%。最后,流量为4、6、8 LPM的混合式冷凝器冷凝器段回收热量的冷却水出口温度分别为6.6、8.2、9.8oC。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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