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Study of Adsorbent Energy Density and Regeneration for Long Term Thermal Energy Storage Of Solar and Waste Heat Dan Dicaire (dandicaire@hotmail.com) and F. Handan Tezel (*) Department of Chemical and Biological Engineering University of Ottawa, 161 Louis-Pasteur, Ottawa, Ontario K1N 6N5 CANADA Abstract A lab scale system has been developed in this study to demonstrate long term thermal energy storage for space heating using adsorbent beds. The reversible exothermic adsorption process releases heat when exposed to humidity and can be regenerated using low grade heat obtained from solar or waste heat. The energy does not degrade with time and the system can be recharged repeatedly without significant loss of performance. The level of regeneration/energy storage achieved from various regeneration conditions has been studied. The practical feasibility of the system is verified by applying the resulting regeneration parameters, efficiency, and energy densities to typical residential space heating needs. The experiments were performed on a new hybrid material as well as a natural zeolite in order to confirm that the trends are reproducible in different adsorbents. 3 different scenarios have been considered for this seasonal thermal storage and corresponding adsorbent beds have been sized. Introduction Solar energy is the most abundant and accessible source of energy on earth. However, it is not constant through the seasons producing an excess during the summer and a deficiency during the winter. The development of more environmentally responsible energy practices is pushing to increase efficiencies and find value in previously unusable waste. The key to utilizing wasted solar heat is storage; to accumulate energy when it is in excess and use it when it is lacking. Although there are many different types of Thermal Energy Storage (TES) systems, the focus of this paper is on “Long Term Adsorption Thermal Energy Storage” and its many advantages over typical sensible thermal storage system like aquifers or water tanks. Adsorption is an exothermic reversible process. When a bed of adsorbent is exposed to humid air, adsorption of water takes place and the exothermic process releases heat. Once the adsorbent is saturated, the system can be regenerated by introducing heat (provided by solar energy or waste heat) to release the adsorbed water and regenerate the adsorbent so that it is ready to adsorb water again. The stored energy does not degrade with time as long as the adsorbent is kept dry. They can also be recharged repeatedly with limited loss of performance [9]. _______________________________________________________ (*) Author to whom correspondence should be sent to: handan.tezel@uottawa.ca 1PDF Image | Study of Adsorbent Energy Density and Regeneration for Long Term Thermal Energy Storage
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