유기 랭킨 사이클 기반 제습 증발냉각 공조시스템의 1차 에너지 절감효과

Abstract

This research evaluates the impact of an organic Rankine cycle (ORC) powered by various heat sources on enhancing the primary energy saving potential of a liquid desiccant and indirect and direct evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS). The liquid desiccant used for dehumidification of the process air needs regeneration that in turn requires a low-grade heat, preferably waste heat from a combined heat and power (CHP) system, to maximize the energy benefits in this thermally driven air condition system. Considering that ORC is a promising CHP system, we applied a solar thermal system and a district heat source, respectively, to a 2-kW ORC integrated with an LD-IDECOAS to build two system cases for a comparative study. The primary energy consumption of each system case was estimated and compared using detailed energy simulation. The results of the analyses show that the ORC-integrated LD-IDECOAS powered by the district heat source exhibits the best primary energy saving potential (i.e., 35%).