| Title |
Capacity Modulation of a Multi-Type Heat Pump System using PID Control with Fuzzy Logic |
| Keywords |
Multi-type heat pump ; 멀티형 열펌프 ; Capacity modulation ; 용량조절 ; PID control ; PID 제어 ; Fuzzy logic ; 퍼지 로직 ; Variable speed compressor ; 가변속 압축기 ; Electronic expansion valve ; 전자팽창 밸브 |
| Abstract |
Performance of a water-to-water multi-type heat pump system using R22 which has two indoor units has been investigated experimentally. The refrigerant flow rate of each indoor unit was regulated by an electronic expansion valve and the total refrigerant flow rate of the system was controlled by a variable speed compressor. In the system, evaporator outlet pressure of refrigerant and outlet temperatures of secondary fluid from indoor units were selected as control variables. Experiments were executed for both cooling and heating modes using PID control method with fuzzy logic, and results of the test are compared with a classical PID method. In the case of PID control with fuzzy logic, the fuzzy control rules corrects PID parameters each time. Results show that PID control with fuzzy logic has the merits of quick response and reduced overshoot. |