Application of phase-change energy storage technology in heat pump systems

doi:10.3969/j.issn.2097-0706.2022.04.007

Abstract

Abstract:

Phase change material（PCM） can store and release energy at a specific temperature because of its unique physical properties. It has a widespread use in energy storage. Medium and low temperature phase-change energy storage technology is mainly applied to building energy conservation. To facilitate the integrated application of phase-change energy storage technology and heat pump technology,the ways to improve the coefficient of performance（COP） of heat pumps,reduce the defrosting time of heat pumps and strength the heat / cold storage capacity of heat pumps are analyzed. The integrated application can effectively improve heat pump COP, operational stability of heat pumps and the comfort level of users. This integration is promising in the field of building energy conservation.

Key words: PCM, phase-change energy storage, heat pump, heat pump COP, new energy, carbon neutrality, heat supply of buildings

CLC Number:

TK01

WANG Changjun, YAN Jun, DONG Yong, SONG Zhanlong. Application of phase-change energy storage technology in heat pump systems[J]. Integrated Intelligent Energy, 2022, 44(4): 51-64.

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材料		相变温度/℃	比焓/ （kJ·kg^-1）	比热容/ [kJ·(kg·K)^-1]	固态密度/ （kg·L^-1）	液态密度/ （kg·L^-1）	导热系数/ [W·(m·K)^-1]
无机材料	CaCl₂·6H₂O^[6]	30.0	187.49	1.46(s)/2.13(l)	1.500	1.710	—
	41%MgCl₂·(H₂O)₆+ 59%Mg(NO₃)₂·(H₂O)₆^[7]	40.0~65.0	—	—	—	—	0.600
	Na₂SO₄·10H₂O^[8,9]	32.4	241.00	1.80(s)/3.30(l)	1.460	1.330	0.700(s)/0.540(l)
石蜡类	RT6^[10]	8.0	140.00	1.80(s)/2.40(l)	0.860	0.770	—
	RT10^[11]	9.0	134.90	2.00	0.880	0.770	0.200
	RT11HC^[12]	10.0~12.0	—	—	0.880	0.770	0.200
	A16^[13]	15.0~17.0	213.00	2.30~2.37	0.830	0.800	0.180
	RT22^[14]	19.0~23.0	200.00	2.00	0.880	0.770	0.200
	RT27^[10]	25.0	146.00	1.80(s)/2.40(l)	0.870	0.750	—
	Paraffin^[9]	35.0	160.00	2.00	0.880	0.760	0.200
	Paraffin^[15]	44.0	174.00	2.44(s)/2.53(l)	0.830	0.783	0.130
	RT44HC^[16]	43.0	255.00	—	0.860	0.760	0.200
	Paraffin^[17]	49.6~50.6	146.00	2.20(s)/3.62(l)	0.845	0.765	0.360
	Paraffin^[17]	54.9~55.8	149.10	2.37(s)/3.16(l)	0.850	0.768	0.400
	Paraffin^[18]	52.0~54.0	140.00	2.40	0.920	—	5.380
	RT58^[19]	58.0	179.00	1.80(s)/2.40(l)	0.760	0.900	—
	Paraffin^[17]	59.5~60.2	189.50	2.89(s)/4.31(l)	0.862	0.780	0.400
有机酸类	36%硬脂酸+64%棕榈酸^[7]	40.0~65.0	—	—	—	—	0.288
有机酸类	65%癸酸+35%月桂酸^[20]	18.0	140.80	—	0.900	—	0.143