Simulation of the heat storage and release performance of a phase-change solar greenhouse in a severely cold area

doi:10.19799/j.cnki.2095-4239.2024.1167

Abstract

Abstract:

In this study, we explore the factors that influence and the inherent laws that govern the heat storage and release performance of phase-change solar greenhouses in cold regions. First, a full-scale model of a phase-change solar greenhouse was constructed using TRNSYS software, and its reliability and accuracy were verified through experiments. Subsequently, this model was used to investigate the effects of the structural parameters of the enclosure—such as the span of the greenhouse, the north-wall height, and the heat-transfer coefficient—as well as the parameters of the phase-change material—such as the phase-change temperature, latent heat, and phase-change material dosage—on the average air temperature and the effective accumulated temperature of the phase-change greenhouse. Finally, a nonlinear regression equation was established between the effective accumulated temperature and the aforementioned parameters using multiple regression methods within the SPSS software. The following conclusions were obtained by analyzing the data from these experiments: The effective accumulated temperature and the average air temperature both decrease as the span of the greenhouse and the north-wall heat-transfer coefficient increase, a negative correlation, and they both increase as the north-wall height, latent heat of the phase change, and phase-change material usage increase, a positive correlation. The effective accumulated temperature and the average air temperature reach their maximum values—16.63 ℃ and 36.29 ℃·d, respectively—at a phase transition temperature of 23 ℃. A nonlinear regression equation was constructed for the effective accumulated temperature in terms of the heat-transfer coefficient of the north wall, the span of the solar greenhouse, the north-wall height, material usage, latent heat of the phase change, and phase-change temperature. This study thus provides a convenient means for the design and optimization of phase-change solar greenhouses in severely cold areas.

Key words: solar greenhouse, phase change materials, heat storage and release performance, effective accumulated temperature, regression equations

CLC Number:

TK 519

Fankang MENG, Dongkun PENG, Peng CAI. Simulation of the heat storage and release performance of a phase-change solar greenhouse in a severely cold area[J]. Energy Storage Science and Technology, 2025, 14(6): 2532-2539.

Figures/Tables 12

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材料	热导率/[W/(m·K)]	比热容/[kJ/(kg·K)]	密度/(kg/m³)
水泥	0.93	840	1800
砖头	0.43	750	1668
苯板	0.042	1380	30
木板	0.058	1890	150
土壤	0.93	1010	1800

参数	值
固体比热容/[J/(kg·K)]	1.46
固体密度/(kg/m³)	1800
液体比热容/[J/(kg·K)]	2.13
液体密度/(kg/m³)	1560
相变潜热/(J/g)	130
相变温度/℃	21

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