Abstract
Water vapor sorption in salt hydrates is a promising method to realize seasonal solar heat storage. Several of these materials have already shown promising performance for this application. However, a significant bottle neck for applications is the low thermal conductivity. In this study, several fabrication methods of the fixation of salts and their hydrates on metals to overcome the problem are presented. The products are analyzed concerning the hydration states, the corrosion behavior, the chemical compatibility, and the mechanical stability.
Highlights
Recent research on heat pumps, refrigeration systems, and heat storage materials has mainly focused on developing environmentally friendly new systems that perform with high efficiency and are able to employ various kinds of primary energy [1]
The useful effect is produced in the evaporator by taking Qeva from the user device, while Qcond and Qad are dissipated to the environment
The third part comprises the results of the analysis of the composites resulting from the combination of polyvinyl alcohol (PVOH) and salt hydrates and compared with common solutions
Summary
Recent research on heat pumps, refrigeration systems, and heat storage materials has mainly focused on developing environmentally friendly new systems that perform with high efficiency and are able to employ various kinds of primary energy [1]. Adsorption refrigeration systems are based upon a batch working principle where adsorption and desorption are combined alternatively [2,3]. The working fluid (usually water, ammonia, or methanol) is evaporated at the lowest temperature using the heat of evaporation Qeva. Because adsorption (of vapor) is an exothermic process, the enthalpy of adsorption is released at a medium temperature. The working fluid is condensed, releasing the heat Qcond. The useful effect is produced in the evaporator by taking Qeva from the user device, while Qcond and Qad are dissipated to the environment. The heat values Qcond and Qad are the useful outputs and Qeva is taken from the environment. For adsorption heat storage applications, the energy Qh is stored during the endothermal desorption and released during the exothermal adsorption Qad
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