Optimum Specifications and Operating Conditions of Ceiling Radiation Cooling and Heating Systems in Cold Regions

Part 1-Comparison of Indoor Thermal Environments for Various Air-Conditioning Systems Based on CFD Analysis

Abstract

In recent years, ceiling radiation air-conditioning systems are being increasingly used in office buildings in southern Japan to achieve energy conservation and comfort. Now, introduction of these systems are being introduced in cold regions. We conducted case studies on air-conditioning systems and window specifications for office buildings in cold regions during winter through CFD analysis, and compared the indoor thermal environments. The results, confirmed that a comfortable indoor thermal environment was formed by introducing the ceiling radiant heating and cooling system (water conveyance), and calm air flow was confirmed. Furthermore, with proper the heating in perimeter zone, air conditioning was unnecessary in interior zone, and this may lead to further energy savings.