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Heating energy performance and part load ratio characteristics of boiler staging in an office building |
Da Young LEE1, Byeong Mo SEO2, Yeo Beom YOON2, Sung Hyup HONG1, Jong Min CHOI3, Kwang Ho LEE4() |
1. Graduate School, Hanbat National University, Daejeon 305-719, South Korea 2. College of Design, North Carolina State University, Raleigh, NC 27695-7701, USA 3. Department of Mechanical Engineering, Hanbat National University, Daejeon 305-719, South Korea 4. Department of Architectural Engineering, Hanbat National University, Daejeon 305-719, South Korea |
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Abstract 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.
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Keywords
EnergyPlus
boiler
part load ratio
gas consumption
office building
boiler staging
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Corresponding Author(s):
Kwang Ho LEE
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Online First Date: 06 December 2018
Issue Date: 04 July 2019
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