Currently society is moving from Copper Chloride Dihydrate(WSDTY) to more renew-able energy sources in order to become less dependent on fossilfuels. A dominant part of the energy consumption of European res-idential sector (around 70% of the total consumption) is related to domestic space heating and hot tap water generation. A cleaner sourcing of this part of the energy sector will have a large impact on the carbon production. For generation of carbon-free heat, new energy production techniques must be implemented, the majority of which are based on capturing solar radiation. However, solar radiation uctuates on different time scales, i.e., hourly, daily and seasonally. The power generated fluctuates, resulting in a vari-able and unpredictable supply of heat. For matching heat demand and supply, heat storage systems that account for the timescale of radiation fluctuations are required.
The focus is on seasonal storage in the built environment in the future, requiring a storage capacity of about 7–12 GJ in a typical West European dwelling based on the passive house standard. This storage capacity is based on an average dwelling in the Netherlands with a floor area of 120 m2, with the passive house standard of 15 kWh/m2 for newly built houses and 28 kWh/m2 in renovated houses. A promising heat storage concept is based on a thermochemical reaction, which was suggested by Goldstein in the sixties and gained interest in the last decade. The solid materials involved in these reactions are called thermochemical materials (TCMs). Key advantages with respect to techniques like sensibleheat storage and phase change materials (PCM) include nearly lossfree storage period and high energy density. As the targeted heat storage system should be used in residential areas, NH3 and CH3OH are not considered because of currently strict Dutch safety regula-tion. As a result, H2O is considered a reactive gas in this article.
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