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2020 Vol.14, Issue 1 Preview Page

Research Article

Improvement Methods of Individual Boiler Heat Source considering Reduced Heating Load of Low-Energy Apartment Buildings

저에너지 공동주택의 감소된 난방부하를 고려한 개별 보일러 열원의 개선 방안

Kyu-Nam Rhee1
,
Gun-Joo Jung2*
이 규남1
,
정 근주2*
1Assistant professor, Department of Architectural Engineering, Pukyong National University
2Professor, Department of Architectural Engineering, Pukyong National University
1부경대학교 건축공학과 조교수
2부경대학교 건축공학과 교수
* Corresponding Author
28 February 2020. pp. 124-135
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Abstract

In this study, the improvement methods of conventional heat sources were suggested and evaluated in order to reduce the heating energy of low-energy apartment buildings. To do this, the part load ratio (PLR) was analyzed for the apartment building that was designed in accordance with the energy saving design standard in Korea. The analysis results showed that the PLR of low-energy apartment buildings was very low, which may result in the reduced part-load efficiency of conventional gas boiler and the deteriorated energy-saving performance. To overcome this problem, it was suggested that the part load efficiency under low-PLR conditions should be enhanced by applying modulation boiler or boiler with high turn-down ratio. The improved part load efficiency allowed more energy saving up to 9.6%. It was also proposed that the low-energy apartment buildings should be equipped with condensing boilers, which have relatively high part load efficiency under low-PLR conditions. It was found that the condensing boiler can reduce the heating energy consumption by 27.0%. As for the operation strategy, it was suggested to decrease supply water temperature in order to increase the boiler efficiency while preventing discomfort due to overheating in the highly-insulated apartment buildings. It was found that water temperature of 40℃ can reduce the heating energy consumption by 13.1%.

Keywords
Apartment building
Heating load
Nominal capacity
Part load
Part load ratio
Boiler efficiency
Heating energy

키워드
공동주택
난방부하
정격 용량
부분부하
부분부하율
보일러 효율
난방에너지
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Information
  • Publisher :Korean Institute of Architectural Sustainable Environment and Building Systems
  • Publisher(Ko) :한국건축친환경설비학회
  • Journal Title :Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
  • Journal Title(Ko) :한국건축친환경설비학회논문집
  • Volume : 14
  • No :1
  • Pages :124-135
  • Received Date : 2020-01-28
  • Revised Date : 2020-02-03
  • Accepted Date : 2020-02-04
  • DOI :https://doi.org/10.22696/jkiaebs.20200012
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