가스엔진 VRF(Variable Refrigerant Flow) 히트펌프 시스템의 운전특성 및 이코노마이저 제어를 통한 에너지 절감 평가

Abstract

Purpose: Building energy saving has been becoming important recently, and it could be achieved by improving HVAC system efficiency and operating HVAC system properly. The purpose of this study is to analyze gas engine VRF(Variable Refrigerant Flow) heat pump performance and to investigate energy effective economizer control in Korean climate. Method: In EnergyPlus, temperature-dependent cooling and heating performance of gas engine VRF heat pump was modeled and simulation results were compared to the actual gas consumption of the research facility. The energy saving potentials of differential dry bulb control and differential enthalpy control were also simulated and investigated. Result: The efficiency of gas engine VRF heat pump increases with decreasing outdoor air dry bulb temperature in summer and increasing outdoor air wet bulb temperature in winter. Differential dry bulb control saves 8% ventilation system sensible cooling energy, but use more 4% and 1% latent cooling energy in July and August when compared to the actual building outdoor air intake schedule. In Contrast, Differential enthalpy control saves 7% sensible and 11% latent cooling energy because Korea summer climate is hot and humid. As a result, differential enthalpy control is a suitable economizer control method for Korea considering climate characteristics.