Analysis of the non-uniform thermal environment of local floor and ceiling radiant heating: numerical simulation and thermal comfort experiment

天花板(云) 平均辐射温度 辐射采暖 热舒适性 环境科学 辐射能 工作温度 辐射冷却 热的 气象学 辐射热 材料科学 光学 地质学 地理 辐射 物理 复合材料 气候变化 海洋学
作者
Jiale Hu,Yingying Wang,Ling Su,Dengjia Wang,Yong Li,Baimu Suolang,Xianfeng Liu
出处
期刊:Building and Environment [Elsevier BV]
卷期号:262: 111810-111810
标识
DOI:10.1016/j.buildenv.2024.111810
摘要

Local radiant heating is a crucial method for avoiding inefficient heating and reducing energy consumption in buildings. To supplement existing research, which primarily focuses on local vertical-wall radiant heating, this paper investigates the non-uniform thermal environment of local floor and ceiling radiant heating rooms under various radiant positions, areas, and temperatures. The study utilizes numerical analysis by Ansys Fluent and thermal comfort experiments in Xi'an, China, which has a Dwa Köppen climate classification. When the local heating zone is located near windows and doors, the radiant film preferentially exchanges heat with them, resulting in a decrease in air temperature and mean radiant temperature. In such cases, it is recommended to increase the radiant temperature or area. With a radiant area of 5m2 and a radiant temperature of 25°C, expanding the radiant area to 15m2 increases the average air temperature in the local heating zone by 5.0°C, while raising the radiant temperature to 29°C increases it by 1.4°C. Moreover, enlarging the radiant area can effectively improve occupants' skin temperature, thermal sensation, and overall thermal comfort. When the radiant area and temperature are determined, priority should be given to local floor radiant heating over local ceiling radiant heating due to its lower air temperature, larger temperature gradients, and smaller mean radiant temperatures. This study aims to provide references for proposing refined design and regulation parameters of local floor and ceiling radiant heating systems in the future.
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