Journal
BUILDING SIMULATION
Volume 14, Issue 3, Pages 523-533Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12273-020-0686-2
Keywords
packed bed thermal energy storage; solar heating system; performance evaluation; parametric analysis
Categories
Funding
- National Key Ramp
- D Program of China [2018YFB0905104]
- Science and Technology Planning Project of Jilin Province [20180201006SF]
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The study shows that the thermal performance of the packed bed heat storage device is most influenced by the HTF inlet temperature, while a decrease in the capsule diameter has a positive effect. The order of importance of each parameter within their variation range is HTF inlet temperature, HTF flow rate, PCM capsule size, and PCM initial temperature.
The goal of this study is to investigate the effect of key design parameters on the thermal performance of the packed bed heat storage device by numerical calculation. A one-dimensional, non-equilibrium packed bed latent heat storage mathematical model was established and the applicability of the model was verified. The results demonstrate that the inlet temperature of the heat transfer fluid (HTF) had the greatest influence on each index. When the inlet temperature increased from 333 K to 363 K, exergy destruction increased threefold, effective heat storage time decreased by 67%, effective heat storage increased by 38%, and exergy efficiency decreased by 11%. The decrease of the capsule diameter had a positive effect on each evaluation index. According to the sensitivity analysis, the order of importance of each parameter within their variation range was HTF inlet temperature, HTF flow rate, PCM capsule size and PCM initial temperature.
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