Set-point Tracking Algorithm of the System Air-Conditioning With Third-Party Thermostat

다국어 초록 (Multilingual Abstract)

Recently, as the demand for energy saving increases in the North American air conditioning market, the use of a high-efficiency VRF(Variable Refrigerant Flow) system is increasing and compatibility with a thermostat which was traditionally used for unitary system control in the US market is also required. Since it is difficult to achieve high efficiency from the simple interlocking between the thermostat which is a simple ON/OFF controller and the VRF system which is a continuous device, a control algorithm that minimizes energy consumption while maintaining a comfort indoor heating and cooling environment is needed. In order to solve this, this paper suggests control algorithm for achieving energy saving under this combination by tracking the thermostat set-point from first thermo-off signal and return air temperature. As a result, when the proposed algorithm was applied under the same conditions, the power consumption was saved up to 35% in cooling operation and 4% in heating operation compare to condition without the algorithm. In the case of heating, there was meaningful result that the defrost inrush time is shortened due to a decrease in temperature fluctuation and a reduction in the compressor operating frequency.

목차 (Table of Contents)

• Abstract
• 1. INTRODUCTION
• 2. SYSTEM AIR-CONDITIONING AND THERMOSTAT
• 3. SET-POINT TRACKING ALGORITHM
• 4. EXPERIMENTAL RESULTS
• 5. CONCLUSION
• REFERENCES