Abstract
In recent years, due to increasing global environmental consideration, the demand for further energy saving and promotion of the ZEB transition in newly constructed and existing office buildings is increasing. In this sense, the radiation air-conditioning system has received considerable attention because of it can realize a high level of comfort with a small amount of heat loads. However, there are only a few cases in which the radiant air conditioning system has been used for ZEB modification, and an improvement effect has been shown. Therefore, this study aimed to show the effectiveness of introducing a radiant air-conditioning system, which is an energy saving technology for ZEB conversion, to existing middle and small type office buildings (T building). In this paper, first, the prediction accuracy of CFD analysis was verified by comparison with actual measurement results. Then, we conducted a detailed evaluation of the thermal environment in the current work space and conducted a case study on the assumption that the heat insulation of the skin and the introduction of the radiation air-conditioning system were implemented. Compared with the conventional air-conditioning system, the temperature distribution on the horizontal and vertical surfaces was made uniform, and the temperature difference between the top and bottom was eliminated; thus the effectiveness of the radiation air-conditioning system by renovation was confirmed.
