Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

This study conducted positive performance test and economy analysis on energy saving effect of improvement of old central heating and air conditioning system in the main building of Presbyterian University and Theological Seminary. Existing heat source system alternatively operates 22-year-old two absorption chiller-heaters and provides air conditioning and heating to main building, library, and chapel. Considering the building type, cooling and heating system, load analysis, chiller type, and operation status, the old absorption chiller-heaters have been replaced with oil-free inverter turbo chiller. Also, BEMS has been used to check the characteristics of change in energy consumption. This study conducted a comparative analysis on energy consumption before and after the improvements by collecting the data from May to October in 2018. The analysis result showed that the gas consumption for air conditioning with existing chiller-heater was 30,587 Nm³ a year. On the other hand, the turbo chiller monitored with BEMS consumed 29,370 kWh. The analysis result proved the energy saving of about 24.75 TOE (Ton of Oil Equivalent) by introducing the oil-free inverter turbo chiller for efficient operation. Such hybrid heat source system and efficient BEMS operation allow effective investment in the perspective of energy.