期刊
ENERGY CONVERSION AND MANAGEMENT
卷 149, 期 -, 页码 129-139出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2017.07.018
关键词
Resorption; Seasonal thermal energy storage; Solar energy; Composite sorbent
资金
- National Natural Science Foundation of China [51606118]
- foundation for Innovative Research Groups of National Natural Science Foundation of China [51521004]
- Heat-STRESS project - Engineering and Physical Science Research Council of the UK [EP/N02155X/1]
- EPSRC [EP/M008088/1, EP/N02155X/1] Funding Source: UKRI
An innovative resorption system is established and investigated for seasonal thermal energy storage. Solar energy is stored in form of chemical potential in summer whereas the stored energy could be released in form of sorption heat in winter. Working pair of MnCl2-CaCl2-NH3 is selected and composite sorbents are developed with expanded natural graphite treated with sulfuric acid as the matrix for heat and mass transfer intensification. It is indicated that the highest effective heat storage density, heat power density and system COP are able to reach 1047 kJ kg(-1), 402 W kg(-1) and 0.58 under the condition of 30 degrees C heat output temperature and 15 degrees C ambient temperature. Novel resorption thermal energy storage system verifies the feasibility for seasonal energy storage at high ambient temperature in winter, which reveals great potentials for solar energy utilization. Also worth noting that two possible solutions i.e. temperature upgrade mode and sorption-compression mode are analyzed and compared when ambient temperature is relatively low i.e. below 0 degrees C. Results demonstrate that heat could be supplied in term of -15 degrees C ambient temperature and 50 degrees C heat output temperature. Two methods could deal with the issues at low ambient temperature, which have their respective advantages for different applications. (C) 2017 Elsevier Ltd. All rights reserved.
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