日光温室北墙与环境间换热特点及边界条件

对墙体内侧为相变材料的日光温室3层异质结构北墙建立传热模型，采用隐式有限差分方法，建立了相变北墙节点温度离散方程。以墙体内外表面温度为边界条件，通过Matlab编程计算墙体内温度分布，对温室北墙内外表面温度节点进行热平衡分析，计算北墙内外表面与外界环境间换热量，从而分析了日光温室北墙蓄放热特性及墙体与外界换热的特点。通过Matlab拟合工具，建立了晴好天气条件下日光温室北墙体表面与环境间换热量和墙体表面温度、室外空气温度、太阳辐射强度之间的函数关系。研究结果可为日光温室北墙优化设计与评价提供计算参考。

Heat Transfer Characteristics and Boundary Conditions between North Wall of Chinese Solar Greenhouse and Environment

A one-dimensional unsteady-state heat transfer model for a three-layer north wall with a phase-change material used for thermal storage in a Chinese solar greenhouse was established． Implicit finite difference method was used to establish node temperature dispersion equation． Temperature distribution in the wall was calculated using Matlab programming． By analyzing thermal balance of the nodes on internal and external surfaces of north wall, rate of heat transfer between surfaces of north wall and environment was calculated and analyzed． Using Matlab fitting tool, functional relationship between heat transfer rate and wall surface temperature, outdoor air temperature, and solar radiation intensity was analyzed under various weather conditions． The results could provide reference material for optimizing and evaluating design of north wall of a solar greenhouse．