| Abstract |
Geothermal district space heating systems that are sized to accommodate extreme weather conditions will have excess capacity during the milder portions of the year. By incorporating a lower capital cost, higher fuel cost system for servicing the peak heating requirements, the excess geothermal capacity, and therefore the total annual cost, may be reduced. A model that approximates the least cost percent of peak demand, for which the geothermal system should be sized, is developed in this paper. |