Analysis of energy efficiency standards of central air conditioning systems
Keywords:
Energy efficiency, Cooling load, Magnetic bearing centralized air conditioning systemAbstract
This study investigated the cooling capacity (kW/TR) to find the optimum performance value by surveying the operation of chilled water for air conditioning in buildings in Thailand. This study was a case study of a hotel in Phuket Province that uses a centralized air conditioning system with a capacity of 700 refrigeration tons, cooled by water, operating 24 hours a day. The data collection took 7 days, recording values every 30 minutes. The results were used to analyze the efficiency of the chilled water system to find the optimum cooling load. This centralized chiller uses magnetic field bearing technology in the compressor. The measurements were performed by analyzing the chilled water system by measuring the flow rate, the temperature of the inlet and outlet chilled water, and the electrical power of the chilled water system. The results showed that the cooling load of this hotel building varied, with a maximum load of 81.14%, a minimum of 27.39%, and an average of 57.93%. The cooling load rate is the evaluation of the efficiency of the chiller under different load conditions. The average NPLV is optimal at 100% cooling load, but the actual utilization is only 1.2% per year, while at 75% cooling load, the maximum utilization is 70.2% per year. And the central air conditioner using magnetic bearing technology has a variable cooling load, with a cooling load of 191.8 refrigeration tons; the efficiency value is 0.456 kW/TR. In conclusion, this study indicates that the cooling load of most buildings is variable. Therefore, choosing the appropriate technology, such as a magnetic bearing central air conditioner, can help increase energy efficiency and air conditioning system management effectively.
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