Energy storage optimization of a plate-type phase change heat exchanger

doi:10.19799/j.cnki.2095-4239.2021.0192

Abstract

Abstract:

In this paper, a prototype of a plate-type phase-change heat exchanger (PPCHE) is designed, and the influence of geometric parameters on the performance of the PPCHE is studied. Five PPCHEs models with different plate-type phase-change units (PPCUs) were constructed to control the heat exchanger volume and the PCM mass. Numerical simulation optimized the heat-transfer fluid (HTF) inlet temperature and velocity. The results showed that increasing the number of PPCUs increased the heat-transfer rate, but the pressure drop also increased. When the PPCUs numbered five in total, the heat-transfer efficiency was the best. The energy storage efficiency was proportional to the fluid velocity and inversely proportional to the pressure drop. The heat-transfer rate increased with an increasing HTF temperature; however, the increased rate decreased with an increase in HTF velocity or temperature. In this study, the best condition for the highest energy storage performance was v=0.5 m/s and N=5. In practical application, the design of the internal structure of the heat exchanger when the flow rate is low should be a primary focus.

Key words: plate phase change heat exchanger, numerical simulation, energy storage rate, pressure drop

CLC Number:

TK 02

Lihui LIU, Hang ZHANG, Zian PENG, Jie LI, Xiaoqin SUN. Energy storage optimization of a plate-type phase change heat exchanger[J]. Energy Storage Science and Technology, 2021, 10(5): 1745-1752.

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方案编号	结构参数				边界条件
方案编号	PCM数量N	PCM厚度/mm	通道厚度/mm	PCM/热流体积/m3	热流温度/℃	热流流速/(m·s^-1)
1	1	0.075	0.075	0.010125	50	1
2	3	0.025	0.025		50	1
3	5	0.015	0.015		50	1
4	7	0.0107	0.0107		50	1
5	9	0.0083	0.0083		50	1
6	5	0.015	0.015		35、40、45、50、60	1
7	5	0.015	0.015		50	0.5、1、2、3、4

属性	数值*
相变温度/℃	27
密度/(kg·m^-3)	850(s)/790(l)
导热系数/[W·(m·K)^-1]	0.36(s)/0.16(l)
比热容/[kJ·(kg·℃)^-1]	2.15(s)/2.30(l)
相变潜热/(J·kg^-1)	231.2
动力黏度/(Pa·s)	0.005
体积膨胀系数/K^-1	0.001

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