西安建筑科技大学学报(自然科学版)

建筑节能与可再生能源利用是实现碳达峰碳中和的重要技术手段.太阳能集热器-内嵌管式相变顶板系统是一种将相变板内衬于屋顶内侧,可用于房间的隔热保温,并通过相变材料存储太阳能实现全天室内空气供暖的拥有高效节能潜力的系统.为了研究该系统的传热、节能特性,根据该内嵌管式相变顶板的结构形式建立了一种二阶可变热容热阻简化传热模型并提出一种简便的参数配置方式,进一步建立了该结构的数值模型,利用模拟结果验证该简化模型的准确性.结果表明:简化模型的建模方法是可行的,该二阶可变热容热阻简化模型可以预测该内嵌管式相变顶板的传热特性,相比于数值模型,简化模型全天热流误差小于5%; 简化模型的计算效率高于数值模型,其计算时间仅为数值模型的1%.

Building energy conservation and utilization of renewable energy are important technology means for achieving carbon emission peak and carbon neutrality. The system integrating solar collector with pipe-embedded phase change material(PCM)slab roof is a system with high efficiency and energy-saving potential, in which the PCM slab is lined on the internal side of the roof for heat insulation and solar energy can be stored through phase change materials for all-day indoor air heating. In this paper, a simplified heat transfer model of second-order variable thermal capacity and thermal resistance is established based on the structure of the pipe-embedded phase change material slab, and a simple parameter configuration method is proposed. And then, the numerical model of the structure is further established, and the accuracy of the simplified model is verified by the simulation results. The result shows that the modeling method of this simplified model is feasible and this simplified model of second-order variable thermal capacity and thermal resistance can predict the heat transfer characteristics of this slab. Compared with the numerical model, the all-day heat flow error of the simplified model is less than 5%. The computational efficiency of the simplified model is higher than that of the numerical model, and the computational time is only 1% of the numerical model.

引言
1 系统及屋面描述
2 内嵌管式相变顶板简化模型
3 简化模型与数值模型
4 边界条件
5 结果分析对比
6 总结

图1 太阳能集热器-内嵌管式相变顶板系统示意图<br/>Fig.1 The schematic diagram of the system integrating solar collector with pipe-embedded phase change material(PCM)slab roof

图1 太阳能集热器-内嵌管式相变顶板系统示意图
Fig.1 The schematic diagram of the system integrating solar collector with pipe-embedded phase change material(PCM)slab roof

表1 屋顶各层材料及相变材料物性参数<br/>Tab.1 Physical parameters of roof materials and phase change materials

表1 屋顶各层材料及相变材料物性参数
Tab.1 Physical parameters of roof materials and phase change materials

图2 内嵌管式相变顶板屋面示意图及相变板简化模型<br/>Fig.2 Schematic diagram of the pipe-embedded PCM roof and the simplified model of PCM slab

图2 内嵌管式相变顶板屋面示意图及相变板简化模型
Fig.2 Schematic diagram of the pipe-embedded PCM roof and the simplified model of PCM slab

图3 内嵌管式相变顶板屋面简化模型<br/>Fig.3 The simplified model of pipe-embedded PCM slab roof

图3 内嵌管式相变顶板屋面简化模型
Fig.3 The simplified model of pipe-embedded PCM slab roof

图4 内嵌管式相变顶板屋面模拟平台<br/>Fig.4 The simulation platform of pipe-embedded PCM slab roof

图4 内嵌管式相变顶板屋面模拟平台
Fig.4 The simulation platform of pipe-embedded PCM slab roof

图5 室外空气综合温度<br/>Fig.5 Comprehensive outdoor air temperature

图5 室外空气综合温度
Fig.5 Comprehensive outdoor air temperature

图6 屋面上表面温度与热流曲线<br/>Fig.6 Temperature and heat flow on the upper surface of the roof

图6 屋面上表面温度与热流曲线
Fig.6 Temperature and heat flow on the upper surface of the roof

图7 内嵌管壁温度与热流曲线<br/>Fig.7 Temperature and heat flow of the inner surface of the embedded pipe

图7 内嵌管壁温度与热流曲线
Fig.7 Temperature and heat flow of the inner surface of the embedded pipe

图8 相变顶板下表面温度与热流曲线<br/>Fig.8 Temperature and heat flow of the lower surface of the PCM slab

图8 相变顶板下表面温度与热流曲线
Fig.8 Temperature and heat flow of the lower surface of the PCM slab

图9 相变材料液相率<br/>Fig.9 Liquid phase rate of the PCM

图9 相变材料液相率
Fig.9 Liquid phase rate of the PCM

表2 各表面全天换热量统计<br/>Tab.2 All-day heat exchange on each surface

表2 各表面全天换热量统计
Tab.2 All-day heat exchange on each surface

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备注

引言

1 系统及屋面描述

2 内嵌管式相变顶板简化模型

3 简化模型与数值模型

4 边界条件

5 结果分析对比

6 总结

期刊信息