Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17866
Title: Experimental investigations on the use of capillary tube and thermostatic expansion valve in storage-enhanced heat recovery room air-conditioner
Authors: Jia, J
Lee, WL 
Keywords: Air-conditioner
Capillary tube
Heat recovery
Space cooling
Thermostatic expansion valve
Water heating
Issue Date: 2015
Publisher: Elsevier
Source: Energy and buildings, 2015, v. 101, 5855, p. 76-83 How to cite?
Journal: Energy and buildings 
Abstract: Abstract The use of storage-enhanced heat recovery room air-conditioner (SEHRAC) to supply hot water and provide space cooling for energy saving has been confirmed effective, but the heat recovery process can lead to significant refrigerant pressure fluctuations. Whether an expansion device can function properly despite the fluctuations is decisive to the successful use of SEHRAC. Capillary tube (CT) and thermostatic expansion valve (TEV) are the two most used expansion devices in SEHRAC, but a suitable type has never been identified in extant literature. In this study, laboratory experiments were conducted to enable a side-by-side comparison of the two expansion devices. A prototype SEHRAC, which could be switched between the CT and TEV systems, was designed and setup in a test facility for two identical sets of experiments. For each set of experiments, a series of tests under different outdoor temperatures were conducted. It was found that an overall better performance was achieved by the TEV system. The space cooling and water heating capacities were on average 16.3-19.4% and 18.5-23.4% larger than the CT system. The overall coefficient of performance was also found 12.5-20.9% higher. The results confirmed that TEV is preferred for use in SEHRAC.
URI: http://hdl.handle.net/10397/17866
ISSN: 0378-7788
EISSN: 1872-6178
DOI: 10.1016/j.enbuild.2015.05.007
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