Experimental investigation on a MnCl2–CaCl2–NH3 thermal energy storage system |
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| Affiliation: | 1. College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling 712100, China;2. Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China;1. Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA;2. Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA;3. Sandia National Laboratory, Albuquerque, NM 87123, USA;1. Mechanical Engineering Department, Technological Educational Institute of Western Greece, Meg. Alexandrou 1, Patra, 26334, Greece;2. School of Mathematics, University of East Anglia, Norwich, NR4 7TJ, UK |
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| Abstract: | Thermal energy storage (TES) is regarded as one promising technology for renewable energy and waste heat recovery. Among TES technologies, sorption thermal energy storage (STES) has drawn burgeoning attention due to high energy storage density, long-term heat storage capability and flexible working modes. Originating from STES system, resorption thermal energy storage (RTES) system is established and investigated for recovering the heat in this paper. The system is mainly composed of three high temperature salt (HTS) unit beds; three low temperature salt (LTS) unit beds, valves and heat exchange pipes. Working pair of MnCl2–CaCl2–NH3 is selected for the RTES system. 4.8 kg and 3.9 kg MnCl2 and CaCl2 composite adsorbents are filled in the adsorption bed. Results indicate that the highest thermal storage density is about 1836 kJ/kg when the heat charging and discharging temperature is 155 °C and 55 °C, respectively. Volume density of heat storage ranges from 144 to 304 kWh/m3. The highest ratio of latent heat to sensible heat is about 1.145 when the discharging temperature is 55 °C. The energy efficiency decreases from 97% to 73% when the discharging temperature increases from 55 to 75 °C. |
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| Keywords: | Sorption Resorpion thermal energy storage Energy density Composite adsorbent |
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