首页|Thermal performance analysis and optimization over a twin-stage phase change ceiling-floor cascaded cooling system
Thermal performance analysis and optimization over a twin-stage phase change ceiling-floor cascaded cooling system
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NETL
NSTL
Tsinghua Univ Press
Phase change material (PCM) is outstanding for building thermal insulation, competent for indoor cooling enhancement. However, single-PCM deployment seems not good enough for better cooling performance and higher energy efficiency. Therefore, experiment with mathematic optimization over PCM ceiling-floor cascaded cooling system has been conducted. An experimental test rig has been built with different PCMs attached to the room ceiling/floor respectively. In this manuscript, optimized system configuration for summer cooling has been obtained via control variable method based on the experimental weather data in Tianjin, China. The optimal systematic configuration has been determined as 4-cm-thick PCM panels both for floor/roof, and 23/28 ℃ in phase change temperature arrangement in floor/roof sequence, along with heat transfer fluid (HTF) of 19 ℃ circulating through the capillaries inserted at middle location of the PCM panels in Down-feed/Up-return manner with the interval of 15 cm, is recommended. Cooling HTF being 3 ℃ higher than the experimental results after optimization, indicates a decent energy conservation potential. Also, thermal conductivity is suggested to be 3.45 W/(mK), and possessing around 200 J/g in latent thermal energy storage ability. Finally, it is concluded that differentiated phase change temperature arrangement in increasing manner along the heat transfer fluid circulation direction brings about better cooling performance.
NETL
NSTL
Tsinghua Univ Press
