Experimental investigation of HFC407C/HC290/HC600a mixture in a window air conditioner
Experimental investigation of HFC407C/HC290/HC600a mixture in a window air conditioner
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DOI：
10.1016/j.enconman.2005.10.026
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发表时间：
2006-09
影响因子：
10.4
通讯作者：
D. B. Jabaraj;P. Avinash;D. Lal;S. Renganarayan
中科院分区：
文献类型：
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作者：
D. B. Jabaraj;P. Avinash;D. Lal;S. Renganarayan
根据蒙特利尔议定书，窗式空调中广泛使用的制冷剂之一HCFC22必须尽快淘汰。目前，HFC407C被认为是HCFC22的潜在替代品，但用多元醇酯油(POE)改装HFC407C是一个主要问题，因为HFC407C与矿物油不相容。通过在HFC407C中加入HC混合物，克服了HFC407C与矿物油的混溶问题。用臭氧友好型制冷剂改装现有的HCFC22系统并保持该系统的能效的上述技术经济可行性问题是空调行业的挑战。本文在不更换矿物油的情况下，对采用环保型混合工质HFC407C/HC290/HC600a改造的窗式空调机进行了实验分析。并将其性能和能耗与常规除尘器进行了比较。观察到，混合物需要加长冷凝器，以便将排放压力保持在可接受的范围内。这也导致了冷凝器的更好的热传递。因此，在这项研究中，冷凝器管长度增加了19%，以适应与HCFC22相比的混合物。与HCFC22相比，新混合物的制冷量比HCFC22高9.54-12.76%，而实际COP比HCFC22高11.91-13.24%。综合性能证明，HFC407C/HC混合工质可以作为淘汰HCFC22的环保型替代工质。
HCFC22, one of the widely used refrigerants in window air conditioners must be phased out soon as per the Montreal protocol. Presently, HFC407C is considered as a potential drop in substitute for HCFC22, but retrofitting HCFC22 systems with HFC407C with polyol ester oil (POE) is a major issue as HFC407C is immiscible with mineral oil. The miscibility issue of HFC407C with mineral oil was overcome with the addition of a HC blend to it. The above technoeconomic feasibility issues to retrofit the existing HCFC22 systems with an ozone friendly refrigerant and retain the energy efficiency of the system are challenges in the air conditioning sector. In this present work, an experimental analysis has been conducted in a window air conditioner retrofitted with eco-friendly refrigerant mixtures of HFC407C/HC290/HC600a without changing the mineral oil. Its performance, as well as energy consumption, was compared with the conventional one. It is observed that the mixtures demand lengthening of the condenser in order to maintain the discharge pressure within acceptable limits. This also resulted in better heat transfer at the condenser. Therefore, in this study, the condenser tube length was increased by 19% to suit the mixtures as compared to HCFC22. Compared to HCFC22, the refrigeration capacity of the new mixture was 9.54–12.76% higher than that of HCFC22, while the actual COP was found to be 11.91–13.24% higher than that of HCFC22. The overall performance has proved that the HFC407C/HC blend refrigerant mixture could be an eco-friendly substitute to phase out HCFC22.