Cooling Performance Comparison of Radiant Floor System and All-air System with Solar Radiation☆

Abstract In large space buildings such as airports, convention centers and entrance halls, the e velope is dominated by glass facades and skylights, and the indoor thermal enviro ment is characterized by high-intensity solar radiation. The heat transf r process of radiant floor and air system are compared in this paper. During the cool ng process, radiant floor removes indoor heat not only by convection but also by radiation, while air system handles all the heat by circulating ai. It means that radiant floor can absorb the solar radiation directly. A case study comparing radiant floor and air system is analyzed, and the results show that with transient high-density solar radiation, radiant cooling system can enlarge the terminal cooling apacity more remarkably than air system. The adaptivity of radiant cooling system can help avoiding temperature fluctuations and prevent unnecessary indoor adjustment requirements.