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

The importance of domestic hot water energy in residential buildings is expected to continue increasing because of the upcoming mandatory of zero-energy building. This study was conducted in mock-up laboratory to evaluate the potential of saving domestic hot water energy in individual heating boilers. The purpose of this study is to develop a hot water control method for individual heating boilers in the future based on this experimental results. The mock-up laboratory was simulated an 84 m² apartment housing unit. This study measured the hot water temperature at the end of the faucet and the shower head in bathroom and kitchen, the temperature of supply water to the boiler, the domestic hot water temperature and the flow rate provided from the boiler. In addition, the amount of LPG gas consumed by the operation of the boiler was measured. Each data was monitored at 1-second intervals. The first test was conducted for 5 days using hot water at the domestic hot water temperature setting values of 40℃. In the second test, we defined a 1-day hot water usage scenario and analyzed the savings by measuring energy consumption for domestic hot water based on LPG gas usage. The domestic hot water temperature setting values are 40℃ (case 1), 50℃ (case 2) and 60℃ (case 3). From this result, we were able to confirm the possibility of saving domestic hot water energy in individual heating boiler.