이산화탄소 열펌프의 동특성에 관한 연구

In the air-conditioning and refrigeration industry, the efforts to protect the environment have been made. One of them is to use carbon dioxide as an alternative refrigerant, however, several researches have shown that the transcritical heat pump system using CO₂ has relatively lower efficiency resulting in a degraded steady-state system performance. In this study, the dynamic characteristics of the CO₂ heat pump system were analysed. The improved transient behavior were achieved by applying the MIMO (multi-input multi-output) controller to the CO₂ heat pump system. MIMO controller was designed and developed using the LQG (Linear-Quadratic-Gaussian) optimal control theory which minimizes the cost function.