Abstract
A computational simulation model for determining the thermal performance of large-scale community solar heating systems with interseasonal heat storage is described. Special attention has been paid to the mathematical formulation of the storage unit. It comprises an uninsulated stratified hot water tank excavated in rock. The storage capacity of the surrounding ground may also be utilized by vertical heat exchanger pipes. Comparisons of theoretical system performance predictions with recent experimental measurements from a full-scale prototype installation are presented and found to be in reasonable agreement. The simulation program is also used to evaluate the thermal performance of various district solar heating system configurations for northern cold climatic conditions (60°N).
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