送风速度对夏热冬冷地区办公室供暖效果的影响

Influence of Supply Air Velocity on Office Room Heating in Hot-Summer and Cold-Winter Climatic Zones

夏热冬冷地区在空调系统设计中一般以夏季工况为主,故可能造成冬季供暖能耗浪费且室内温度无法满足人体热舒适要求.针对上海一实际办公室在不同送风速度下对冬季室内热环境进行了实测.实测结果表明:夏热冬冷地区建筑窗墙面积比过大和送风参数的不当设置,使送风热量难以到达人员所在空间,导致室内上部与下部空间温差过大和加热过程中存在能源浪费.尽管提高送风速度不能彻底解决人体头-足温差过大的问题,但可以减小因温度分布不均匀造成的热负荷增加量,改善人体热舒适和实现节能效应.

The set values of the supply air parameters in design of an air-conditioning system mainly meet the requirement of summer indoor thermal environment in hot-summer and cold-winter climatic zones,it may result in the waste of energy for heating while the situation that the indoor temperature can not match the requirements of human thermal comfort in winter.The indoor thermal environment of an office room with different air supply velocity in Shanghai is measured in winter.The results show that it is difficult for the warm air to reach the occupied space due to large window-to-wall ratio and improper ventilation parameters.Therefore,the temperature difference between the upper space and lower space is too large,and an additional energy waste exists during the heating process.Although increasing supply air velocity cannot eliminate the large temperature difference between head and feet,the increased heat load caused by non-uniformly indoor temperature distribution will be decreased.Besides,the requirements of human thermal comfort and energy-saving can also be achieved by increasing supply air velocity.