Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)
- Volume 12 Issue 5
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- Pages.446-475
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- 2000
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- 1229-6422(pISSN)
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- 2465-7611(eISSN)
Capacity Modulation of a Multi-Type Heat Pump System Using PID Control
PID 제어를 이용한 멀티형 열펌프의 용량조절
Abstract
Performance of a water-to-water multi-type heat pump system using R22 has been experimentally investigated. Total refrigerant flow rate was adjusted with a variable speed compressor and the refrigerant flow rate for two indoor units were controlled by electronic expansion valves. Evaporator outlet pressure of refrigerant and indoor unit outlet temperatures of secondary fluid were selected as controlled variables. Experiments were carried out for both cooling and heating modes using PID control method. Results show that the multi-type heat pump system can be adequately controlled by keeping control gains at certain levels for various operating conditions.
Keywords