Experimental Study on Heat Transfer Characteristics of New Jacketed Cold Storage Condenser

In response to the actual demands of the energy storage type organic Rankine power generation cycle, this study proposes a new type of jacketed shell and tube heat exchanger with integrated cold storage and heat exchange. N-tedecane is selected as the phase change material for cold storage, low-temperature water as the cold source, and R134a as the heat source. The phase change material for cold storage is filled inside the jacket tube of the heat exchanger. Cold fluid is introduced into the inner tube to cause the phase change material to condense and store cold. After the cold storage is completed, R134a flows in from the shell side and condenses through heat exchange with the solidified phase change material for energy storage. This study discusses the influence laws of different cold water mass flow rates and temperatures on the cold storage performance of this heat exchanger, and analyzes the condensation effect of R134a. The results show that when the mass flow rate is 0.5 kg/s and the cold water temperature is between 3 and 4°C, the average power of the energy storage heat exchanger in the condensation experiment is 80 W, and the average convective heat transfer coefficient is 110.73 W/(m²·K). This research provides an experimental basis for the development of energy storage organic Rankine power generation cycles.