제습증발냉각 전외기 공조시스템의 다양한 기후 조건에 대한 적용성 및 에너지 성능 분석

Abstract

The main purpose of this study is to evaluate the applicability of a liquid desiccant and an evaporative cooling assisted, 100% outdoor air system (LD-IDECOAS) in six typical cities in China. The six cities are located in different climatic zones in China and are selected because they are comparable owing to the outdoor air conditions. Many studies have shown that the annual operating energy consumption of LD-IDECOAS is nearly half compared with the conventional variable air volume (VAV) system. Because the climate characteristics of the six selected cities were different, the appropriate mode of operation of the LD-IDECAOS was applied to each studied city, and energy simulations were performed. Indoor design conditions were set to “design code” for office building JG67–2006, as recommended by Chinese standards. Based on the design conditions of each region, the required cooling and heating loads were calculated for office buildings using transient system simulations (TRNSYS) 17, and the performance of the LD-IDECOAS and its energy consumption were simulated with a commercial engineering equation solver (EES) program. Depending on the climate characteristics of each city, adequate modifications were evaluated with simulations in terms of energy consumption. The proposed system was compared with the VAV system and the evaporative cooling assisted 100% outdoor air-conditioning system (IDECOAS) for detailed simulation results in the effort to evaluate the energy-saving potential. Finally, the results show that the proposed system saves considerable energy over conventional VAV systems, and in summer applications it saves even more energy than IDECOAS. However, there is a slight difference between different geographical regions in terms of the annual operating energy consumption. In summary, the proposed system can yield significant energy-saving benefits in hot and humid regions, whereas in the dry regions the proposed system is more applicable in the summer. Consequently, LD-IDECOAS can be adopted for different climatic zones as a HVAC system by introducing 100% outdoor air.