The Development of a Solar Energy Installation for Space Heating and Cooling Based on Hygroscopic Materials
In a previous study  we have investigated a heat storage system based on the adsorption of water in solid adsorbents. The general conclusion from that study was that the application of such storage systems is hardly feasible due to the relative unimportant function of storage in air-based solar heating systems which results in small improvements over a rock-bed or a water storage device. Therefore the application of adsorption heat storage systems cannot be justified in solar heating installations where the system only operates during winter-time. The energy output of a solar adsorption system can be enlarged by using it also during summer-time which then results in a continuous load during the whole year. In many climates both heating and cooling are required depending on the season. A well designed dessicant system has the capability of delivering heat or cold depending on the operation mode which makes the application for combined heating and cooling interesting.
For the Dutch circumstances such an energy demand only occurs in office buildings. In order to make a first approximation concerning the energy output of the solar dessicant system we have carried out some calculations for a Dutch office building. The result of that study is very promising because it appears that the yearly usefull solar energy can be around 300 kWh/m2(1000 MJ/m)collector for the combined heating and cooling system. This means that 30–40% of that thermal energy demand can be delivered by solar energy. Also a first cost benefit analysis gives promising results which might be even better in more sunny climatic regions. In the near future the solar adsorption system performance will be studied in more detail.
KeywordsHeat Storage Solar Collector Office Building Solar Heating Space Heating
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- 1.Jr. J.K.M. Verdonschot Thermal heat storage in hygroscopic materials for air-based solar heating systems. Institute of Applied Physics TNO-TH, 21 October 1981, Delft Report nr. 803. 220.Google Scholar