|Mok, Ching Wah
|Assessment of thermal energy storage system with PCME as both heat transfer fluid and storage medium
|Heat storage devices
Hong Kong Polytechnic University -- Dissertations
|Department of Building Services Engineering
|xi, 65 pages : color illustrations
|Latent heat thermal energy storage (LHTES) system is commonly used technology in HVAC system for buildings. With the use of phase change material (PCM), LHTES system can store more energy as it has high sensible heat capacity and latent heat will be released during phase change. Adopting solid-liquid PCM is usually in compact shell-and-tube or encapsulated system, while several downsides were shown in previous research: (1) PCM leakage, (2) Slow Heat Transfer Rate and (3) Undesirable Energy loss. To overcome these disadvantages, thermally stratified energy storage tank system with the use of PCM emulsion working as both storage medium and heat transfer fluid (HTF) is studied in this paper. This setup directly solves the problem of PCM leakage as PCM droplets are dispersed inside the mixing fluid, and it can enhance heat transfer rate as the surface area to effective volume ratio has greatly increased. At the same time, undesirable energy loss by the proposed setup is also studied and discussed in this paper. By comparing this thermally stratified storage tank with ordinary stratified water tank system, several performance indices will be examined for usage of air-cooled chilled ceiling. The performance indices are effective storage ratio, energy storage effectiveness and discharging rates.
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