Abstract
Sorption heat storage system performance heavily depends on the operating temperature. It is found that testing temperatures reported in literature vary widely. In respect to the building application for space heating, reported testing temperatures are often outside of application scope and at times even incomplete. This has led to application performance overestimation and prevents sound comparison between reports. This issue is addressed in this paper and a remedy pursued by proposing a static temperature and vapor pressure-based testing guideline for building-integrated sorption heat storage systems. By following this guideline, comparable testing results in respect to temperature gain, power and energy density will be possible, in turn providing a measure for evaluation of progress.
Highlights
Closed processes require heat and mass exchangers (HMX) for sorption and desorption and evaporation and condensation and operation is performed under sorbate vapor atmosphere
In order to extend the description to open systems, a vapor pressure of 3.0 kPa is fitting, the equivalent of 24 ◦ C evaporating temperature
It is clear that evaporating temperatures greater than 10 ◦ C and condensing temperatures lower than 30 ◦ C may be encountered under favourable discharging or charging conditions, declaration of performance; temperature, power and energy density, at such optimal temperatures may be misleading
Summary
Due to the long storage period, it is in the nature of this application to have a strongly reduced number of charging and discharging cycles compared to a diurnal storage system. This greatly increases the cost per stored energy and makes economic viability challenging [1]. Thermal storage systems, releasing energy in the form of heat, may meet the necessity for low storage material cost more readily than electro-chemical technologies. Proposed for this purpose are sorption technologies, addressing adsorption, liquid absorption and solid absorption [2]. A realistic ing procedure for the sorption heat storage system for space heating is proposed
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