TY - JOUR
TI - Optimal phase change temperature for building cooling heating and power system with PCM-TES based on energy storage effectiveness
AU - Zhang Yin
AU - Wang Xin
AU - Zhang Yinping
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 1085
EP - 1093
PT - Article
AB - Integrating thermal energy storage (TES) equipment with building cooling  heating and power (BCHP) system can improve system thermal performance. In  this paper, a simplified model of TES-BCHP system composed of a gas turbine,  an absorption chiller and TES equipment with phase change materials (PCM) is  presented. To evaluate the energy saving effect of PCM-TES, a new index,  energy storage effectiveness, is proposed and its relationship with primary  energy consumption is established. Aimed at maximizing the energy storage  effectiveness, the optimal phase change temperature of the PCM-TES-BCHP  system is obtained. The results show that the theoretically optimal phase  change temperature is just the geometrical average value of ambient  temperature and exhaust gas temperature from gas turbine for ideal PCM-TES  equipment with infinite NTU. It also indicates that both energy storage  effectiveness and optimal phase change temperature increase with increasing  NTU. So improving the thermal performance of PCM-TES device is favourable  for increasing energy efficiency and saving primary energy consumption  accordingly. This work is of great importance in guiding the optimization  design of practical PCM-TES-BCHP systems.