建筑外表面换热系数取值方法对建筑负荷预测的影响  

Influence of selection methods of external surface heat transfer coefficient on building load forecasting

作　　者：杨柳[1] 张辰 刘衍[1] 刘江[1] 侯立强[1] 刘加平[1] Yong Liu;Zhong Chen;Liu Yon;Liu Jiang;Hou Liqiong;Liu Jiaoping(State Key Laboratory of Green Building in Western China,Xi＇an,China)

机构地区：[1]省部共建西部绿色建筑国家重点实验室西安建筑科技大学

出　　处：《暖通空调》2018年第9期11-18,共8页Heating Ventilating & Air Conditioning

基　　金：陕西省重点研发计划重点项目(编号:2017ZDXM-SF-076);陕西省教育厅重点项目重点实验室类项目(编号:17JS068);陕西省博士后科研项目

摘　　要：建筑外表面换热系数(α_e)受表面风速、粗糙度等因素的影响。以西安市某办公建筑为例,针对α_e取定值及采用随风速和粗糙度变化的SimpleCombined算法计算2种情况,应用EnergyPlus建筑能耗模拟软件对建筑负荷进行了数值模拟和对比分析。结果表明:采用SimpleCombined算法时的供暖期建筑累计热负荷比α_e取定值时小13.20%,空调期建筑累计冷负荷则大3.04%。为使建筑负荷预测结果更符合实际情况,结合现行工程计算特点,在运用建筑能耗模拟软件预测建筑负荷时,建议采用SimpleCombined算法计算α_e。The external surface heat transfer coefficient （αe） is affected by surface wind speed, roughness and other factors. Taking an office building in Xi＇an as an example, adopting different selection methods （αe） is set as a constant value or calculated based on the SimpleCombined algorithm）, simulates and compares the building load using the EnergyPlus software. The results show that, when adopting the SimpleCombined algorithm, the building cumulative heating load during heating period is 13.20% lower than that of setting αe as a constant value, however, the building cumulative cooling load during cooling period is 3.04% higher. Considering the current engineering calculation characteristics and achieving more real load prediction results, suggests adopting the SimpleCombined algorithm to calculate αe when predicting building loads using building energy consumption simulation software.

关 键 词：外表面换热系数 表面风速 粗糙度 办公建筑 建筑负荷 数值模拟 

分 类 号：TU831.2[建筑科学—供热、供燃气、通风及空调工程] TU111.195