西安建筑科技大学学报(自然科学版)

双层相变通风屋面的影响因素研究

(华中科技大学环境科学与工程学院,湖北武汉 430000)

关键词：相变通风屋面; 相变材料; 夜间通风; 动态热网模型; TRNSYS模拟

Study on the influencing factors of double-layer phase change ventilation roof

LENG Kangxin, YU Jinghua, YANG Qingchen, ZHAO Jingang

(School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430000, China)

Keywords：phase change ventilation roof; phase change material; night ventilation; dynamic heating network model; TRNSYS simulation

DOI: 10.15986/j.1006-7930.2021.06.016

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参考文献

在负荷模拟软件TRNSYS中建立了带有双层相变通风屋面的建筑模型,在以武汉市为代表的夏热冬冷地区气候条件下,分别研究了相变层相变温度范围、相变层厚度和通风速度对屋面热工性能的影响,并进行优化设计.从空调累积负荷、相变材料利用率和经济性因素考虑高温相变层的最佳相变温度范围为26～28 ℃,最佳厚度为30 mm,最佳通风速度为2～3 m/s,低温相变层的最佳相变温度范围为15～17 ℃,最佳厚度为20～30 mm.经过优化设计后,双层相变通风屋面与参照屋面相比,在供冷期的累积冷负荷可降低30.18%,在供热期的累积热负荷可降低33.92%.

In the load simulation software TRNSYS, a building model with a double-layer phase-change ventilated roof was established. Under the climatic conditions of hot summer and cold winter regions represented by Wuhan, the effects of phase-change temperature range, thickness of phase-change layer and ventilation speed on the thermal performance of the roof were studied, and the optimal design was carried out. Considering the cumulative load of the air conditioner, the utilization rate of phase change materials and economic factors, the optimal phase change temperature range of the high temperature phase change layer is 26～28 ℃, the optimal thickness is 30 mm, and the optimal ventilation speed is 2～3 m/s; the optimal phase change temperature range of the low-temperature phase change layer is 15～17 ℃, and the optimal thickness is 20～30 mm. After the optimization design, the cumulative cooling load of the double-layer phase change ventilation roof can be reduced by 30.18% in the cooling period and 33.92% in the heating period compared with the reference roof.

引言
1 模型建立
2 影响因素研究
3 节能效果分析
4 结论

图1 双层相变通风屋面结构示意图<br/>Fig.1 Schematic diagram of double-layer phase change ventilation roof structure

图1 双层相变通风屋面结构示意图
Fig.1 Schematic diagram of double-layer phase change ventilation roof structure

表1 屋面各层的材料热物性参数<br/>Tab.1 Material thermal properties of each layer of the roof

表1 屋面各层的材料热物性参数
Tab.1 Material thermal properties of each layer of the roof

图2 简化动态热网模型<br/>Fig.2 Simplified dynamic heating network model

图2 简化动态热网模型
Fig.2 Simplified dynamic heating network model

表2 办公建筑围护结构的热工特性<br/>Tab.2 Thermal characteristics of office building envelope

表2 办公建筑围护结构的热工特性
Tab.2 Thermal characteristics of office building envelope

图3 武汉典型年水平面太阳辐射及室外空气干球温度<br/>Fig.3 Horizontal solar radiation and outdoor air dry bulb temperature in Wuhan in typical years

图3 武汉典型年水平面太阳辐射及室外空气干球温度
Fig.3 Horizontal solar radiation and outdoor air dry bulb temperature in Wuhan in typical years

图4 带有双层相变通风屋面建筑的TRNSYS模型<br/>Fig.4 TRNSYS model of a building with a double-layer phase-change ventilation roof

图4 带有双层相变通风屋面建筑的TRNSYS模型
Fig.4 TRNSYS model of a building with a double-layer phase-change ventilation roof

图5 高温相变层在不同相变温度范围时的液相率<br/>Fig.5 Liquid phase ratio of high temperature phase change layer in different phase change temperature range

图5 高温相变层在不同相变温度范围时的液相率
Fig.5 Liquid phase ratio of high temperature phase change layer in different phase change temperature range

图6 不同相变温度范围时空调的供冷期冷负荷<br/>Fig.6 Cooling load of air conditioner in cooling period in different phase change temperature range

图6 不同相变温度范围时空调的供冷期冷负荷
Fig.6 Cooling load of air conditioner in cooling period in different phase change temperature range

图7 高温相变层厚度不同时的液相率<br/>Fig.7 Liquid phase ratio with different thickness of high temperature phase change layer

图7 高温相变层厚度不同时的液相率
Fig.7 Liquid phase ratio with different thickness of high temperature phase change layer

图8 高温相变层厚度不同时空调的供冷期冷负荷<br/>Fig.8 Cooling load of air conditioner in cooling period with different thickness of high temperature phase change layer

图8 高温相变层厚度不同时空调的供冷期冷负荷
Fig.8 Cooling load of air conditioner in cooling period with different thickness of high temperature phase change layer

图9 通风速度不同时的液相率<br/>Fig.9 Liquid phase ratio at different ventilation speeds

图9 通风速度不同时的液相率
Fig.9 Liquid phase ratio at different ventilation speeds

图10 通风速度不同时空调的供冷期冷负荷<br/>Fig.10 Cooling load of air conditioner in cooling period at different ventilation speeds

图10 通风速度不同时空调的供冷期冷负荷
Fig.10 Cooling load of air conditioner in cooling period at different ventilation speeds

图11 低温相变层在不同相变温度范围时的液相率<br/>Fig.11 Liquid phase ratio of low temperature phase change layer in different phase change temperature range

图11 低温相变层在不同相变温度范围时的液相率
Fig.11 Liquid phase ratio of low temperature phase change layer in different phase change temperature range

图12 不同相变温度范围时空调的供热期热负荷<br/>Fig.12 Heat load of air conditioner during heating period in different phase change temperature range

图12 不同相变温度范围时空调的供热期热负荷
Fig.12 Heat load of air conditioner during heating period in different phase change temperature range

图13 低温相变层厚度不同时的液相率<br/>Fig.13 Liquid phase ratio with different thickness of low temperature phase change layer

图13 低温相变层厚度不同时的液相率
Fig.13 Liquid phase ratio with different thickness of low temperature phase change layer

图14 不同相变温度层厚度时空调的供热期热负荷<br/>Fig.14 Heat load of air conditioner during heating period in different thickness of high temperature phase change layer

图14 不同相变温度层厚度时空调的供热期热负荷
Fig.14 Heat load of air conditioner during heating period in different thickness of high temperature phase change layer

表3 双层相变通风屋面和参照屋面的空调冷负荷<br/>Tab.3 Air conditioning cooling load of double-layer phase-change ventilated roof and reference roof

表3 双层相变通风屋面和参照屋面的空调冷负荷
Tab.3 Air conditioning cooling load of double-layer phase-change ventilated roof and reference roof

表4 双层相变通风屋面和参照屋面的空调热负荷<br/>Tab.4 Air conditioning heat load of double-layer phase-change ventilated roof and reference roof

表4 双层相变通风屋面和参照屋面的空调热负荷
Tab.4 Air conditioning heat load of double-layer phase-change ventilated roof and reference roof

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）张引科张小龙

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 模型建立

2 影响因素研究

3 节能效果分析

4 结论

期刊信息