Numerical prediction of hot water flow and temperature distribution in thermal storage tank

In order to evaluate energy efficiency of solar hot water systems, a calculation method was developed in this paper that models the unsteady flow and temperature distribution in heat storage tank utilizing Computational Fluid Dynamics (CFD). Compared to actual measurements, adequate calculated results were obtained that agree during both heat storage and supplying hot water. These calculation results can not be easily replicated in actual measurements. Applying these results to a block model that reduces the time required for calculation will be the subject of future study.