日光温室主动蓄放热系统热过程模拟与参数优化研究

doi:10.3969/j.issn.1004-1524.20230436

浙江农业学报 ›› 2024, Vol. 36 ›› Issue (3): 671-680.DOI: 10.3969/j.issn.1004-1524.20230436

日光温室主动蓄放热系统热过程模拟与参数优化研究

毛尔晔(), 张潇丹(), 颉建明, 马宁, 常有麟, 胡世莲

甘肃农业大学园艺学院,甘肃兰州 730070

收稿日期:2023-04-03 出版日期:2024-03-25 发布日期:2024-04-09
作者简介:毛尔晔(1998—),男,甘肃金昌人,硕士研究生,主要从事设施环境调控研究。E-mail:1757756805@qq.com
通讯作者: *张潇丹,E-mail: zhangxiaod@gsau.edu.cn
基金资助:
国家自然科学基金面上项目(32072657)

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

摘要/Abstract

摘要：

为进一步提高日光温室太阳能利用效率,降低加温成本,在当前日光温室主动式水循环蓄放热系统的基础上,构建了系统运行数学模型,利用该模型对系统参数(循环水流量与蓄热水箱体积)进行优化设计。研究结果表明:在兰州地区冬季日光温室生产条件下,当系统循环水流量为0.23 m³·h^-1,蓄热水箱体积为0.13 m³时,系统性能最优,集、放热效率达到70.62%与98.38%,集/放热单元夜间平均热流密度达到237.84 W·m^-2。利用优化后参数,为兰州地区EPS装配式日光温室设计了一套太阳能主动蓄放热加温方案:集放/热单元(高2.05 m,宽1.105 m,厚3 cm)为50个,循环水泵流量为11.5 m³·h^-1,蓄热水箱体积为6.5 m³。该方案可满足日光温室越冬生产,较优化前节约2个集/放热单元,8.5 m³蓄水池体积,降低了加温成本。

关键词: 主动蓄放热, 数学模型, 参数优化, 热流密度, 热负荷

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

中图分类号:

S625.4

毛尔晔, 张潇丹, 颉建明, 马宁, 常有麟, 胡世莲. 日光温室主动蓄放热系统热过程模拟与参数优化研究[J]. 浙江农业学报, 2024, 36(3): 671-680.

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.

图/表 8

图1 主动式水循环蓄放热系统结构图 1,集/放热装置;2,蓄热装置;3,供水管路;4,回水管路;5,支管;6,水阀;7,水泵;8,出水孔;9,水流;10,挡板。

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.

图2 主动蓄放热系统单元实物图

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

图3 蓄热水箱水温实测值和预测值随时间变化曲线

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

图4 EPS日光温室室外气温和太阳辐射强度随时间变化曲线

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

图5 蓄热水箱体积(A)和系统循环水流量(B)对集/放热器放热阶段热流密度的影响

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

表1 优化前后集放热系统蓄放热性能对比

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

表2 温室围护结构的热工性能参数

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)

图6 温室夜间逐时热负荷变化图

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

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日光温室主动蓄放热系统热过程模拟与参数优化研究

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

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