With the advantage of high apparent specific heat capacity, high energy storage density, and better comprehensive heat transfer performance, the microencapsulated phase change material suspension (MPCMS) has wide application prospect in the field of energy storage and transport. In this paper, the discrete phase model (DPM) was employed to simulate the pressure drop and heat transfer characteristics of microencapsulated phase change material suspension flow in heat exchanger consisting of a series of parallel minichannel. The piecewise function that representation microencapsulated phase change material particle specific heat capacity varies with temperature was used to describe the phase change process. The inlet and outlet pressure drop and temperature difference of heat exchanger under different flow rates were discussed and compared with pure water. Meanwhile, the temperature distribution of microencapsulated phase change material suspension and heat surface were also concerned. The modified local Nusselt number in three representative channel of heat exchanger were calculated simultaneously. The results showed that the pressure drop of microencapsulated phase change material suspension in heat exchanger was consistent with that of pure water, but the value was bigger than pure water. With introducing the microencapsulated phase change material particle, the temperature increasing rate of outlet and heat surface was reduced slightly. Therefore, the outlet and heat surface of heat exchanger present low temperature compared to pure water. Because of the influence of inlet/outlet location, the temperature in heat exchanger present the distribution law as middle channel low and two sides channel high. So, there was a difference of the local Nusselt number along the flow direction in different channels. The phase change materials were melted in two sides channels of heat exchanger. However, in middle channel of heat exchanger, the phase change material was melting partly. Therefore, the location of inlet/outlet should be changed or interior structure of heat exchanger should be optimized so that to receive better flow distribution and heat transfer performance.
Jinli LU Yongjun Lü Yafang HAN Fuping QIAN
. Simulation on convective heat transfer of MPCMS in minichannel heat exchanger based on DPM model[J]. The Chinese Journal of Process Engineering, 2018
, 18(5)
: 951
-956
.
DOI: 10.12034/j.issn.1009-606X.217395
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