Influence of store dimensions and auxiliary volume configuration on the performance of medium-sized solar combisystems |
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Authors: | Magdalena Lundh Katrin Zass Klaus Vajen |
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Affiliation: | a Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, P.O. Box 534, SE-751 21 Uppsala, Sweden b Institute of Thermal Engineering, University of Kassel, DE-34109 Kassel, Germany |
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Abstract: | To increase the fractional energy savings achieved with solar thermal combisystems the store volume may be increased. Installation of large stores in single-family houses is, however, often limited by space constraints. In this article the influence of the store dimensions, as well as internal and external auxiliary volume configurations, are investigated for large solar water stores by annual dynamic TRNSYS simulations. The results show that store sizes up to 4 m3 may be used in solar heating systems with 30 m2 collector area. It is further shown that well-insulated stores are rather insensitive to the geometry. Stores deviating from the conventional dimensions still yield high fractional energy savings. Furthermore, the simulations show that the performance of an internal auxiliary volume configuration in most cases exceeds that of a solution with an external auxiliary unit. The practical limitations of very thin auxiliary volumes must, however, be further investigated. |
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Keywords: | Solar heating Solar combisystem Storage tank IEA-SHC task 32 System simulation |
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