Heating energy performance and part load ratio characteristics of boiler staging in an office building

Da Young Lee, Byeong Mo Seo, Yeo Beom Yoon, Sung Hyup Hong, Jong Min Choi, Kwang Ho Lee

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Commercial buildings account for significant portions of the total building energy in South Korea and thus a variety of research on the boiler operation related to heating energy in office buildings has been carried out thus far. However, most of the researches have been conducted on the boiler itself, i.e., the part load ratio characteristics and the corresponding gas energy consumption patterns are not analyzed in the existing studies. In this study, the part load ratio and the operating characteristics of gas boiler have been analyzed within an office building equipped with the conventional variable air volume system. In addition, the gas consumption among different boiler staging schemes has been comparatively analyzed. As a result, significant portions of total operating hours, heating load and energy consumption has been found to be in a part load ratio range of 0 through 40% and thus energy consumption is significantly affected by boiler efficiency at low part load conditions. This suggests that boiler operation at the part load is an important factor in commercial buildings. In addition, utilizing sequential boiler staging scheme can save a gas usage of about 7%. For annual heating energy saving, applying the sequential control boiler with a 3:7 proportion staging is considered to be the optimal control algorithm for maximum efficiency of boilers.

Original languageEnglish
Pages (from-to)339-353
Number of pages15
JournalFrontiers in Energy
Issue number2
Publication statusPublished - 2019 Jun 1
Externally publishedYes


  • EnergyPlus
  • boiler
  • boiler staging
  • gas consumption
  • office building
  • part load ratio

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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