Simulation of solar heat pump system integration of cascade latent heat thermal energy storage based on TRNSYS

doi:10.11949/0438-1157.20241197

Abstract

Abstract:

A solar heat pump drying system of water source is designed for the region of high cold. A cascaded latent heat thermal storage (CTS) device with three stages is integrated in the system for thermal management on the energy of heat pump. The numerical model of the system is constructed by the dynamic simulation platform of TRNSYS. The thermal characteristics of the CTS device are obtained by COMSOL numerical simulation, where the thermo-physical parameters of the phase change materials (PCMs) encapsulated are derived from three stereotyped composites of PCMs based on sodium acetate trihydrate. The operational characteristics of the system are studied before or after the integration of the CTS device. The results show that after the integration with the CTS device, the average temperature in the dry area increases by 7.76℃, the average relative humidity decreases by 8.5%, and the maximum day-night temperature difference and the maximum day-night relative humidity in the room decrease by 5.35℃ and 14.67%, respectively. The average COP of the heat pump reaches 3.40, which is 8.9% larger than that of the heat pump without the integration of the CTS device. The CTS device stores and transfers the daytime solar radiation to the nighttime circulation mode, which is beneficial for the utilization of uneven solar thermal radiation. Consequently, its integration into the heat pump system has a great potential to improve the operational efficiency and stability of the heat pump.

Key words: solar energy, heat pump drying system, dynamic simulation with TRNSYS, cascade latent heat thermal energy storage

摘要：

针对高寒地区设计了一套干燥藏药的太阳能水源热泵干燥系统。该系统集成了级数为三的梯级潜热储能（CTS）装置，用于热泵能源侧的热管理。相变材料的热物性参数源于制备的3种以三水合乙酸钠为基材的定型复合相变材料，通过COMSOL数值模拟得到CTS的热响应特性，依靠TRNSYS的动态仿真平台进行系统的模拟分析。系统在集成CTS装置前后结果表明：集成CTS装置后，干燥区域内的平均温度升高7.76℃，平均相对湿度降低8.5%，室内最大昼夜温差和最大昼夜相对湿度分别减小了5.35℃和14.67%；热泵的平均COP达到3.40，较未集成CTS装置的热泵提升了8.9%。CTS装置将日间太阳辐射热量储存并转移至夜间使用的循环模式有助于提升太阳能热泵系统运行效能和稳定性。

关键词: 太阳能, 热泵干燥系统, TRNSYS动态仿真, 梯级潜热储能

CLC Number:

TK 02

Xin XIAO, Geng YANG, Yunfeng WANG. Simulation of solar heat pump system integration of cascade latent heat thermal energy storage based on TRNSYS[J]. CIESC Journal, 2025, 76(S1): 393-400.

肖鑫, 杨耿, 王云峰. 基于TRNSYS的太阳能梯级蓄热热泵系统模拟[J]. 化工学报, 2025, 76(S1): 393-400.

Figures/Tables 8

References 31

1	Yao M C, Li M, Wang Y F, et al. Analysis on characteristics and operation mode of direct solar collector coupled heat pump drying system[J]. Renewable Energy, 2023, 206: 223-238.
2	Zou L G, Liu Y, Yu M Q, et al. A review of solar assisted heat pump technology for drying applications[J]. Energy, 2023, 283: 129215.
3	IEA. Heating[EB/OL]. (2023.03.20)[2024.10.21] .
4	IEA. Heat Pumps[EB/OL]. (2023.03.20)[2024.10.21] .
5	Li J, Zhang Y, Li M, et al. Study on heating performance of solar-assisted heat pump drying system under large temperature difference[J]. Solar Energy, 2021, 229: 148-161.
6	李金. 低温工况下太阳能补能与热泵耦合干燥系统性能研究[D]. 昆明: 云南师范大学, 2022.
	Li J. Study on performance of coupling drying system of solar energy supplement and heat pump at low temperature[D]. Kunming: Yunnan Normal University, 2022.
7	Gu H, Chen Y Y, Yao X Y, et al. Review on heat pump (HP) coupled with phase change material (PCM) for thermal energy storage[J]. Chemical Engineering Journal, 2023, 455: 140701.
8	Zhao C Y, Yan J, Tian X K, et al. Progress in thermal energy storage technologies for achieving carbon neutrality[J]. Carbon Neutrality, 2023, 2(1): 1.
9	Bellos E, Tzivanidis C, Moschos K, et al. Energetic and financial evaluation of solar assisted heat pump space heating systems[J]. Energy Conversion and Management, 2016, 120: 306-319.
10	Heinz A, Gritzer F, Thür A. The effect of using a desuperheater in an air-to-water heat pump system supplying a multi-family building[J]. Journal of Building Engineering, 2022, 49: 104002.
11	章学来, 林原培, 于树轩, 等. 复合蓄热热泵热水空调技术[J]. 化工学报, 2010, 61(S2): 125-129.
	Zhang X L, Lin Y P, Yu S X, et al. Hot water air conditioning technology of compound heat storage heat pump[J]. CIESC Journal, 2010, 61(S2): 125-129.
12	Zhu C H, Li B G, Yan S B, et al. Experimental research on solar phase change heat storage evaporative heat pump system[J]. Energy Conversion and Management, 2021, 229: 113683.
13	Hirmiz R, Teamah H M, Lightstone M F, et al. Performance of heat pump integrated phase change material thermal storage for electric load shifting in building demand side management[J]. Energy and Buildings, 2019, 190: 103-118.
14	Zhang N, Yuan Y P, Cao X L, et al. Latent heat thermal energy storage systems with solid-liquid phase change materials: a review[J]. Advanced Engineering Materials, 2018, 20(6): 1700753.
15	Wu J H, Feng Y, Liu C P, et al. Heat transfer characteristics of an expanded graphite/paraffin PCM-heat exchanger used in an instantaneous heat pump water heater[J]. Applied Thermal Engineering, 2018, 142: 644-655.
16	Yang J, Qi G Q, Liu Y, et al. Hybrid graphene aerogels/phase change material composites: thermal conductivity, shape-stabilization and light-to-thermal energy storage[J]. Carbon, 2016, 100: 693-702.
17	Mohammed H I. Discharge improvement of a phase change material-air-based thermal energy storage unit for space heating applications using metal foams in the air sides[J]. Heat Transfer, 2022, 51(5): 3830-3852.
18	Soo X Y D, Tan S Y, Cheong A K H, et al. Electrospun PEO/PEG fibers as potential flexible phase change materials for thermal energy regulation[J]. Exploration, 2023, 4(1): 20230016.
19	Martin B, Dušan K, Radim R. A numerical analysis of the thermal energy storage based on porous gyroid structure filled with sodium acetate trihydrate[J]. Energies, 2022, 16(1): 309.
20	Karami R, Kamkari B. Investigation of the effect of inclination angle on the melting enhancement of phase change material in finned latent heat thermal storage units[J]. Applied Thermal Engineering,2019, 146: 45-60.
21	Cheng X W, Zhai X Q. Thermal performance analysis and optimization of a cascaded packed bed cool thermal energy storage unit using multiple phase change materials[J]. Applied Energy, 2018, 215: 566-576.
22	Elbahjaoui R, El Qarnia H. Numerical study of a shell-and-tube latent thermal energy storage unit heated by laminar pulsed fluid flow[J]. Heat Transfer Engineering, 2017, 38(17): 1466-1480.
23	朱子良, 王爽, 姜宇昂, 等. 欧拉-拉格朗日迭代固-液相变算法[J]. 化工学报, 2024, 75(8): 2763-2776.
	Zhu Z L, Wang S, Jiang Y A, et al. Solid-liquid phase change algorithm with Euler-Lagrange iteration[J]. CIESC Journal, 2024, 75(8): 2763-2776.
24	Farid M M, Kanzawa A. Thermal performance of a heat storage module using P C M ' s with different melting temperatures: mathematical modeling[J]. Journal of Solar Energy Engineering, 1989, 111(2): 152-157.
25	Xu H J, Zhao C Y. Thermal efficiency analysis of the cascaded latent heat/cold storage with multi-stage heat engine model[J]. Renewable Energy, 2016, 86: 228-237.
26	Gao L, Dong L W, Liu Z Z, et al. Thermal performance analysis and multi-objective optimization of thermal energy storage unit with cascaded packed bed in a solar heating system[J]. Applied Thermal Engineering, 2023, 219: 119416.
27	Yang G, Xiao X, Wang Y F. Preparation and thermal characterization of composite PCMs with modified melting temperature encapsulated in cascade energy storage device for solar heat pump[J]. Journal of Energy Storage, 2024, 106: 114500.
28	Thermal Energy System Specialists (TESS). TESSLibs 17-Loads and Structures Library Mathematical Reference[EB/OL]. (2020.02.20)[2024.10.21] .
29	Thermal Energy System Specialists (TESS). TESSLibs 17-HVAC Library Mathematical Reference[EB/OL]. (2020.02.20)[2024.10.21] .
30	杨耿, 肖鑫, 王云峰. 基于㶲优化的梯级潜热储能装置的模拟研究[J]. 储能科学与技术, 2023, 12(12): 3770-3779.
	Yang G, Xiao X, Wang Y F. Numerical study of a cascade latent heat energy storage system based on exergy optimization[J]. Energy Storage Science and Technology, 2023, 12(12): 3770-3779.
31	邱羽. 二次回热式空气源热泵与太阳能联合干燥系统性能研究[D]. 昆明: 云南师范大学, 2017.
	Qiu Y. Study on performance of secondary regenerative air source heat pump and solar combined drying system[D]. Kunming: Yunnan Normal University, 2017.

物性	SAT1	SAT2	SAT3
各组分质量比(SAT∶AC∶DHPD∶CMC∶EG)	100∶7∶1∶1∶7.5	100∶13∶1∶1∶7.5	100∶19∶1∶1∶7.5
比热容/(kJ/(kg·K))	1.91(固)/2.98(液)	1.95(固)/2.97(液)	1.99(固)/2.96(液)
相变潜热/(kJ/kg)	196.8	186.6	179.6
熔点/℃	51.4	43.9	38.9
相变范围/℃	5.4	9.4	11.7
理论优化相变温度/℃	51.5	43.3	36.4
热导率/(W/(m·K))	2.096(30℃)/2.310(60℃)
密度/(kg/m³)	1136.4

物性	SAT1	SAT2	SAT3
各组分质量比(SAT∶AC∶DHPD∶CMC∶EG)	100∶7∶1∶1∶7.5	100∶13∶1∶1∶7.5	100∶19∶1∶1∶7.5
比热容/(kJ/(kg·K))	1.91(固)/2.98(液)	1.95(固)/2.97(液)	1.99(固)/2.96(液)
相变潜热/(kJ/kg)	196.8	186.6	179.6
熔点/℃	51.4	43.9	38.9
相变范围/℃	5.4	9.4	11.7
理论优化相变温度/℃	51.5	43.3	36.4
热导率/(W/(m·K))	2.096(30℃)/2.310(60℃)
密度/(kg/m³)	1136.4

组件	子程序	参数及其设置条件
平板太阳能集热器	Type1b	集热面积：20.0 m²；水流率：200 kg/h；集热器安装角度：45°
缓冲水箱	Type156	罐体积：6 m³；罐高：2 m；罐内水分层节点数：5；热损失速率：3.325 kJ/(m²·K·h)
辅助加热器	Type138	热效率：0.8；设定加热温度：70℃；水流率：200 kg/( m²·h)；额定加热功率：1 kW
单级液源热泵	Type919	额定空气测流量：1080 m³/h；额定供热量：10.55 kW, 额定供热功率：3.52 kW；新风占比：33%；额定供热量比例：60%；额定供热功率比例：60%
一体式除湿器	Type688	风机额定功率：93 W；额定流率：400 kg/h
瞬态周期时间表	Type14h	10~18 h输出1，其余时间输出0
水泵	Type3b	泵1~3最大流率：400 kg/h；最大功率：16.67 W；功率系数：0.5
恒温差分控制器	Type2b	高温切断温度：100℃；上位温差：10℃；下位温差：4℃
天气文件读取器	Type15-6	地面反射率：无雪覆盖时期0.2，有雪时0.7
建筑干燥区域	Type660	总热损失系数：500 kJ/( K·h)；室内热容：27.23 kJ/K^[6]；容积：10 m³；初始温湿度：20℃，60%；渗透风量：75 kg/h；潜热负荷：2.37 kW；水生成速率：0.49 kg/h；除湿设定点：10%，供热设定温度：55℃

组件	子程序	参数及其设置条件
平板太阳能集热器	Type1b	集热面积：20.0 m²；水流率：200 kg/h；集热器安装角度：45°
缓冲水箱	Type156	罐体积：6 m³；罐高：2 m；罐内水分层节点数：5；热损失速率：3.325 kJ/(m²·K·h)
辅助加热器	Type138	热效率：0.8；设定加热温度：70℃；水流率：200 kg/( m²·h)；额定加热功率：1 kW
单级液源热泵	Type919	额定空气测流量：1080 m³/h；额定供热量：10.55 kW, 额定供热功率：3.52 kW；新风占比：33%；额定供热量比例：60%；额定供热功率比例：60%
一体式除湿器	Type688	风机额定功率：93 W；额定流率：400 kg/h
瞬态周期时间表	Type14h	10~18 h输出1，其余时间输出0
水泵	Type3b	泵1~3最大流率：400 kg/h；最大功率：16.67 W；功率系数：0.5
恒温差分控制器	Type2b	高温切断温度：100℃；上位温差：10℃；下位温差：4℃
天气文件读取器	Type15-6	地面反射率：无雪覆盖时期0.2，有雪时0.7
建筑干燥区域	Type660	总热损失系数：500 kJ/( K·h)；室内热容：27.23 kJ/K^[6]；容积：10 m³；初始温湿度：20℃，60%；渗透风量：75 kg/h；潜热负荷：2.37 kW；水生成速率：0.49 kg/h；除湿设定点：10%，供热设定温度：55℃

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