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 Article


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.


EnergyPlus boiler part load ratio gas consumption office building boiler staging 


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This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20163030111350), and the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry & Energy (No. 20184030201900).


  1. 1.
    Kim T H, Jung Y S, Jung H G. A trend analysis of greenhouses gas reduction technique development for building sector in Korea. In: Proceedings of the fall conference of the Architectural Institute of Korea, Busan, Republic of Korea, 2016, 716–717Google Scholar
  2. 2.
    Pak J H. World energy market insight weekly. Korea Energy Economics Institute. 2016–5–16, Scholar
  3. 3.
    Lee S J. Post 2020 types of greenhouse gas reduction contribution. Korea Energy Economics Institute, 2016Google Scholar
  4. 4.
    Seo J H. Energy saving in boiler. Journal of Korean Association of Air Conditioning Refrigerating and Sanitary Engineers, 2009, 26: 51–59Google Scholar
  5. 5.
    Murray S N, Walsh B P, Kelliher D, O’Sullivan D T J. Multivariable optimization of thermal energy efficiency retrofitting of buildings using static modelling and genetic algorithms — a case study. Building and Environment, 2014, 75: 98–107CrossRefGoogle Scholar
  6. 6.
    Weissmann C, Hong T, Graubner C A. Analysis of heating load diversity in German residential districts and implications for the application in district heating systems. Energy and Building, 2017, 139: 302–313CrossRefGoogle Scholar
  7. 7.
    Giurca I, Badea G, Aşchilean I, Naghiu G S, Megyesi E. Selecting the number and size of boilers used within the heating units of the residential complexes. Energy Procedia, 2017, 112: 134–141CrossRefGoogle Scholar
  8. 8.
    Wu S, Li J. Intelligent and optimal control of energy saving of gas boiler group. In: 2nd International Conference on Computer Engineering and Technology, Chengdu, China, 2010, 50–54CrossRefGoogle Scholar
  9. 9.
    Wei D, Chen A, Sun B, Zhang C. Multi-objective optimal operation and energy coupling analysis of combined cooling and heating system. Energy, 2016, 98: 296–307CrossRefGoogle Scholar
  10. 10.
    Lazzarin R M. The importance of the modulation ratio in the boilers installed in refurbished buildings. Energy and Building, 2014, 75: 43–50CrossRefGoogle Scholar
  11. 11.
    Yu B H, Seo B M, Moon J E, et al. Analysis of part load ratio characteristics and gas energy consumption of a hot water boiler in a residential building under Korean climatic conditions. Journal of The Society of Air-conditioning and Refrigerating Engineers of Korea, 2015, 27: 455–462CrossRefGoogle Scholar
  12. 12.
    Seo B M, Lee K H. Detailed analysis on part load ratio characteristics and cooling energy saving of chiller staging in an office building. Energy and Building, 2016, 119: 309–322CrossRefGoogle Scholar
  13. 13.
    Son J E, Lee K H. Cooling energy performance analysis depending on the economizer cycle control methods in an office building. Energy and Buildings, 2016, 120: 45–57CrossRefGoogle Scholar
  14. 14.
    Yoon Y B, Kim D S, Lee K H. Detailed heat balance analysis of the thermal load variations depending on the blind location and glazing type. Energy and Buildings, 75: 84–95Google Scholar
  15. 15.
    The US Department of Energy. EnergyPlus Engineering Reference. The Reference to EnergyPlus Calculations. 2014, http://www. energyplus.govGoogle Scholar
  16. 16.
    Lee D Y, Seo B M, Kwon H J, et al. Heating performance and partial load ratio characteristics of boiler staging in office building. In: Proceedings of the Summer Conference of The Society of Airconditioning and Refrigerating Engineers of Korea, Pyungchang, Republic of Korea, 2017, 321–324Google Scholar
  17. 17.
    American Society of Heating. Refrigerating and Air-conditioning Engineers. ASHRAE Standard 90.1. Energy Standard for Buildings Except Low-Rise Residential Buildings, 2004Google Scholar
  18. 18.
    Sohn J Y, Kim S H, Ahn B W, et al. Multiple units control of boiler and refrigerator HVAC system. Journal of the Society of Airconditioning and Refrigerating Engineers of Korea. 1992, = RDOC&PrimaryKey = 57473&DBNM = RDCR#.WbenzuQUmUkGoogle Scholar

Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Da Young Lee
    • 1
  • Byeong Mo Seo
    • 2
  • Yeo Beom Yoon
    • 2
  • Sung Hyup Hong
    • 1
  • Jong Min Choi
    • 3
  • Kwang Ho Lee
    • 3
  1. 1.Graduate SchoolHanbat National UniversityDaejeonSouth Korea
  2. 2.College of DesignNorth Carolina State UniversityRaleighUSA
  3. 3.Department of Mechanical EngineeringHanbat National UniversityDaejeonSouth Korea

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