置换通风与辐射冷顶板复合空调系统的室内热环境研究

Indoor thermal environment in rooms with combined air conditioning system of displacement ventilation and chilled ceiling panel

以办公室为研究对象,采用数值仿真的方法,研究了置换通风、顶板辐射供冷及其复合系统在不同负荷条件下的室内热环境,给出了不同负荷条件下,室内的垂直温度及流场分布.结果表明,复合系统的舒适性最好,而且其冷板表面结露的危险也比顶板辐射供冷单独运行时小,可适用的冷负荷范围广.负荷较小时,复合系统的通风效率与置换通风单独运行时相当.随着室内冷负荷的增加,其通风效率有降低的趋势.

An office with combined air conditioning system of displacement ventilation and chilled ceiling panel was studied under three operational modes by using numerical simulation. Indoor thermal environments were obtained and indoor vertical temperature distributions were given under different loads. Results show that the thermal comfort of combined system is the best, and the risk of condensation is lower than that when chilled ceiling panel operates individually. This can be used in buildings with wide range of cooling load. The ventilation efficiency of combined system is about equivalent to that of displacement ventilation system individually under lower load, but it tends to drop as the building cooling load increases.