수치적 모델링을 통한 이산화탄소 급탕기의 특성 연구

Numerical modeling of CO₂ water heater was conducted prior to optimal design of medium and large sized CO₂ water heater, and the experimental test with small sized CO₂ water heater having heat capacity of 4 kW was completed to verify the present numerical model. The present model estimated the experimental data of COP(coefficient of performance), heating capacity, and the hot water outlet temperature within the range of 3% to 8% of mean deviation. As increase of EEV(electric expansion valve) opening area, decreasing of heating capacity and the hot water outlet temperature, and increasing of COP were found in both experimental and numerical investigation.