CFD Simulation of Velocity and Temperature Distribution using Ceiling Fan for Summer in Office Room

摘要

Ceiling fans are often used for improving thermal environment, and they consume low amount of energy in comparison with air-conditioners. This study aims to establish a design and operation method in the office for an air-conditioning system combined with ceiling fans, which can realize comfortable air-conditioning and energy conservation all year round. This paper shows the results of SET~* obtained from CFD simulation under several positions for the indoor thermal environment controlled by the air-conditioner and the ceiling fans in summertime. From a result of CFD simulation for summer, it is confirmed that the ceiling fan is beneficial to reduce SET~*, raising indoor air velocity. The rate inside the ASHRAE Standard 55 comfort zone increased when ceiling fans were operated. The CFD results of air velocity, temperature and SET~* were compared between conditions by frequency distribution. For cooling, air velocity increases and SET~* decreases as a result of ceiling fan effect.