Study on Evaluation of Heat Source Operation for Thermal Storage HVAC Systems

Abstract

Many building owners having thermal storage HVAC systems are interested in operating cost savings with cheaper electric power rates. However, few owners and operators can evaluate the performance of their systems because of insufficient experiences, even though there are some ways to improve operating cost savings. In order to overcome these problems, evaluation indices which applied to some kind of systems are needed. The indices must be defined by considering the some conditions of the systems, for example, size of thermal storage tank, capacity of heat source, magnitude of load and so on. In this paper, we suggested these indices, and the applicability of them are examined by using measured data of real buildings that were installed water thermal storage tanks. As a result, the indices were shown to be effective to judge whether operating strategies of heat source was good or not for Peak-demand-shifting and Peak-demand-reducing.