多孔蓄热墙太阳能采暖系统优化设计

OPTIMAL DESIGN OF THE SOLAR HEATING SYSTEM WITH POROUS HEAT-STORAGE WALL

本文设计了一种优化的多孔蓄热墙太阳能采暖系统,提出了采暖能量利用系数和采暖温度效率两个指标来评价气流组织对太阳能利用的影响,并采用标准k-ε紊流模型、饱和多孔介质能量双方程模型和Brinkman-ForchheimerExtended Darcy模型,计算、分析和比较了通风方式对系统内的传热与流动特性的影响。结果表明,多孔蓄热墙太阳能采暖系统的通风方式,对采暖房内的温度场、流场有着很大的影响,它直接影响到系统的保温作用和多孔墙的热利用率。当系统处于上进上排的通风方式时,有利于提高多孔墙的利用率。

In this paper,an optimal solar heating system with porous heat-storage solar wall is designed.The heating energy available coefficient and the heating temperature efficiency proposed in this paper are regared as two indicators to assess the effect of air distribution on the usage of solar energy.The effect of ventilation mode on the heat transfer and flow characteristics of the heating system are calculated,analyzed and compared by using the energy two-equation model and Brinkman-Forchheimer Extended Darcy model for saturated porous medium,and the standardκ-εturbulent flow model.Results show that the ventilation mode of the solar heating system with porous heat-storage solar wall has a big influence on the temperature field,the flow field in the heating room, and it directly affects the insulation effect of the system and the heat utilization of the porous solar wall.The ventilation pattern of upper-side inlet and upper-side outlet is conducive to raising the utilization of the porous wall.