Determination of performance parameters of hot stratified thermal energy storage tank

Abstract

Performance of stratified thermal energy storage tank is strongly influenced by separation layer between the hot and cool water stored in the tank. This separation layer is evaluated from water temperature inside of the tank. However, difficulty in converting the temperature distribution into performance parameters has been found. In this research, determination of performance parameters from the temperature distribution is investigated. The temperature distributions are obtained from experimental data simulating charging cycle in hot stratified thermal energy storage tank with varies charging flow rates. Determination of the performance parameters are carried out based on temperature distribution utilizing Sigmoid Dose Response formulation. The results show that significant parameter namely thermocline thickness, cumulative cooling capacity and half-cycle Figure of Merit are precisely determined during the charging cycle. Moreover, the parameters growth is also capable to be evaluated precisely in the charging step. The research results proved the ability of SDR formulation for determining the performance parameter in stratified thermal energy storage tank. It his highlighted that the SDR formulation offers advantage of determination performance parameter accurately.