Simulation of thermal processes and optimization of parameters for active heat storage and discharge system in solar greenhouse

doi:10.3969/j.issn.1004-1524.20230436

Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (3): 671-680.DOI: 10.3969/j.issn.1004-1524.20230436

• Biosystems Engineering • Previous Articles Next Articles

Simulation of thermal processes and optimization of parameters for active heat storage and discharge system in solar greenhouse

MAO Erye(), ZHANG Xiaodan(), XIE Jianming, MA Ning, CHANG Youlin, HU Shilian

College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China

Received:2023-04-03 Online:2024-03-25 Published:2024-04-09

Abstract

Abstract:

In order to further improve the efficiency of solar energy use in solar greenhouses and reduce the cost of heating, this study constructed a mathematical model of the system operation on the basis of the current active water circulation heat storage and release system for solar greenhouses, and used the model to optimize the design of the system parameters (the circulating water flow rate and the volume of the heat storage water tank). The results of the study showed that under the winter solar greenhouse production conditions in Lanzhou, when the system circulating water flow rate was 0.23 m³·h^-1 and the volume of the heat storage tank was 0.13 m³, the system performance was optimal, the heat collection and release efficiency reached 70.62% and 98.38%, and the average nighttime heat flux density of the heat collection/release unit reached 237.84 W·m^-2. Using the optimized parameters, the system can be optimized and the heat collection/release unit can be optimized and a set of solar active heat storage and release heating scheme was designed for the EPS assembled solar greenhouse in Lanzhou: 50 collector-explosive/heat release units (2.05 m in heigh, 1.105 m in width and 3 cm in thickness), 11.5 m³·h^-1 circulating water pump flow rate, and 6.5 m³ heat storage tank volume. This scheme can meet the overwintering production of solar greenhouse, save 2 collector/exothermic units and 8.5 m³ storage tank volume than before, and reduce the heating cost.

Key words: active heat storage and release, mathematical model, parameter optimization, density of heat flow, thermal load

CLC Number:

S625.4

MAO Erye, ZHANG Xiaodan, XIE Jianming, MA Ning, CHANG Youlin, HU Shilian. Simulation of thermal processes and optimization of parameters for active heat storage and discharge system in solar greenhouse[J]. Acta Agriculturae Zhejiangensis, 2024, 36(3): 671-680.

Figures/Tables 8

Fig.1 Structure of the active water circulation heat storage and discharge system 1, Heat collector/releaser; 2, Heat storage device; 3, Water pipes; 4, Return line; 5, Branch pipe; 6, Water valve; 7, Water pump; 8, Water outlet; 9, Water flow; 10, Baffle.

Fig.2 Physical picture of the active heat storage and discharge system unit

Fig.3 The curves of the measured and predicted water temperature of the hot water storage tank with time

Fig.4 EPS solar greenhouse outdoor air temperature and solar radiation intensity with time curve

Fig.5 Effect of hot water storage tank volume (A) and system circulating water flow rate (B) on heat flow density in the exothermic phase of the heat collector

Table 1 Comparison of heat storage and discharge performance before and after optimization of heat collection and discharge system %

处理 Treatment	集热效率 Heating collection efficiency	放热效率 Exothermic efficiency
优化前Before optimization	66.33	92.21
优化后After optimization	70.62	98.38

Table 2 Thermal performance parameters of greenhouse enclosure materials

参数 Parameters	墙体Wall		后屋面Back roof	前屋面Front roof
参数 Parameters	聚苯板 Polystyrene sheet	混凝土 Concrete	聚苯板 Polystyrene sheet	保温被+棚膜 Thermal insulation+Greenhouse film
导热系数Thermal conductivity/(W·m^-1·℃^-1)	0.04	1.63	0.04	—
传热系数	0.36	0.26	1.01
Heat transfer coefficient/(W·m^-2·℃^-1)

Fig.6 Greenhouse night-time hour-by-hour heat load variation graph

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Simulation of thermal processes and optimization of parameters for active heat storage and discharge system in solar greenhouse

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