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Communication Dans Un Congrès Année : 1987

Unutilizability method for the design of sunspaces

Isabelle Blanc


The monthly-average auxiliary energy requirement of a building with a sunspace is estimated using the unutilizability method. Two theoritical limits to a sunspace system performance are defined considering the system to have either zero thermal capacity of infinite thermal capacity. With zero thermal capacity, all solar gain in excess of the load has to be dumped and is calculated using the unutilizability factor. With infinite thermal capacity, all solar gains in excess of the load is stored and reused at a later time. To evaluate the auxiliary energy needed by a finite thermal capacity house, the correlation developped for collector-storage walls using the unutilizability concept is applied. Results from the correlation are compared to yearly TRNSYS simulation results for a wide variety of systems types and locations and shows a good agreement (3.4 GJ on a scale from 0 to 160 GJ). This method is general as it allows changes in the sunspace geometry, nature of materials and type of utilization.


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Dates et versions

hal-00520770 , version 1 (24-09-2010)


  • HAL Id : hal-00520770 , version 1


Isabelle Blanc, William A. Beckman, John A. Duffie. Unutilizability method for the design of sunspaces. 1987 European Conference on Architecture, Apr 1987, Munich, Germany. p. 46-48 - ISBN 0951027123. ⟨hal-00520770⟩
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