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This is an Executive Summary of the Final Report to the sponsors, entitled "Evaluation of Thermal Storage for Solar Heating Systems". The study had a single objective: to develop a methodology which relates the design parameters which specify a combined solar heating system to long term system performance. The methodology, known as the SEU Design Method, consists of four steps: derivation of the fundamental equation, formation of the key non-dimensional groupings after introducing suitable reference parameters, establishment of the Design Method correlation constants, and validation of the method. Extensions to the Design Method are derived to include the effects of pipe losses, pump powers, and a heat exchanger embedded in the store. The equations so derived show the link between the SEU Design Method and the key storage parameter, its overall fluid to storage material heat transfer capacity, UA-tf,s. To account for the effects of stratification, a heuristic correction factor is derived using a simple analytic theory. The incorporation of these effects into the Design Method is shown to be straightforward. In the light of experience with the Cardiff storage device, it is concluded that the link between all the system parameters and system performance has been established. This conclusion needs to be tested for the other storage devices represented in the concerted action programme of the European Commission. The implication is that a method is now available for the examination of any solar system design incorporating storage for both thermal performance and economics with a minimum of computational effort

Additional information

Bibliographic Reference: EUR 10928 EN (1987) MF, 46 P., BFR 150, BLOW-UP COPY BFR 230, EUROFFICE, LUXEMBOURG, POB 1003
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