Chilled water temperature set-point reset based on outdoor air temperature and its cooling energy performance in an office building

Young Jun Lee; Sung Hyup Hong; Jong Man Lee; Yeo Beom Yoon; Jong Min Choi; Kwang Ho Lee

doi:10.1007/s12206-022-0241-4

Chilled water temperature set-point reset based on outdoor air temperature and its cooling energy performance in an office building

Young Jun Lee, Sung Hyup Hong, Jong Man Lee, Yeo Beom Yoon, Jong Min Choi, Kwang Ho Lee

Department of Architecture

Research output: Contribution to journal › Article › peer-review

Abstract

In this study, the cooling energy performance of two strategies for controlling ChWT (chilled water temperature) are compared: the conventional control strategy of constantly fixing ChWT and the OAT (outdoor air temperature) compensation control strategy that adjusts ChWT according to the changes in OAT. OAT compensation control strategy was modeled and realized based on Appendix G of ASHRAE Standard 90.1. It was confirmed that applying OAT compensation control strategy can significantly reduce chiller energy consumption, which accounts for the largest portion of total cooling energy consumption. It was found that the difference in total cooling energy consumption between applying the conventional control of constantly fixing ChWT to 6 °C and applying the OAT compensation control was approximately 8 % and 3 % during spring (March to May) and summer (June to August), respectively. Additionally, during the fall (September–November) period, about 7 % of total cooling energy consumption could be saved.

Original language	English
Pages (from-to)	1557-1568
Number of pages	12
Journal	Journal of Mechanical Science and Technology
Volume	36
Issue number	3
DOIs	https://doi.org/10.1007/s12206-022-0241-4
Publication status	Published - 2022 Mar

Keywords

AHU (air handling unit)
Chilled water temperature set-point
Cooling energy
Outdoor air temperature compensation control
VAV (variable air volume)

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1007/s12206-022-0241-4

Cite this

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title = "Chilled water temperature set-point reset based on outdoor air temperature and its cooling energy performance in an office building",

abstract = "In this study, the cooling energy performance of two strategies for controlling ChWT (chilled water temperature) are compared: the conventional control strategy of constantly fixing ChWT and the OAT (outdoor air temperature) compensation control strategy that adjusts ChWT according to the changes in OAT. OAT compensation control strategy was modeled and realized based on Appendix G of ASHRAE Standard 90.1. It was confirmed that applying OAT compensation control strategy can significantly reduce chiller energy consumption, which accounts for the largest portion of total cooling energy consumption. It was found that the difference in total cooling energy consumption between applying the conventional control of constantly fixing ChWT to 6 °C and applying the OAT compensation control was approximately 8 % and 3 % during spring (March to May) and summer (June to August), respectively. Additionally, during the fall (September–November) period, about 7 % of total cooling energy consumption could be saved.",

keywords = "AHU (air handling unit), Chilled water temperature set-point, Cooling energy, Outdoor air temperature compensation control, VAV (variable air volume)",

author = "Lee, {Young Jun} and Hong, {Sung Hyup} and Lee, {Jong Man} and Yoon, {Yeo Beom} and Choi, {Jong Min} and Lee, {Kwang Ho}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C2087157). This work was also supported by a Korea University Grant (No. K2014481). Publisher Copyright: {\textcopyright} 2022, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.",

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doi = "10.1007/s12206-022-0241-4",

language = "English",

volume = "36",

pages = "1557--1568",

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T1 - Chilled water temperature set-point reset based on outdoor air temperature and its cooling energy performance in an office building

AU - Lee, Young Jun

AU - Hong, Sung Hyup

AU - Lee, Jong Man

AU - Yoon, Yeo Beom

AU - Choi, Jong Min

AU - Lee, Kwang Ho

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C2087157). This work was also supported by a Korea University Grant (No. K2014481). Publisher Copyright: © 2022, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2022/3

Y1 - 2022/3

N2 - In this study, the cooling energy performance of two strategies for controlling ChWT (chilled water temperature) are compared: the conventional control strategy of constantly fixing ChWT and the OAT (outdoor air temperature) compensation control strategy that adjusts ChWT according to the changes in OAT. OAT compensation control strategy was modeled and realized based on Appendix G of ASHRAE Standard 90.1. It was confirmed that applying OAT compensation control strategy can significantly reduce chiller energy consumption, which accounts for the largest portion of total cooling energy consumption. It was found that the difference in total cooling energy consumption between applying the conventional control of constantly fixing ChWT to 6 °C and applying the OAT compensation control was approximately 8 % and 3 % during spring (March to May) and summer (June to August), respectively. Additionally, during the fall (September–November) period, about 7 % of total cooling energy consumption could be saved.

AB - In this study, the cooling energy performance of two strategies for controlling ChWT (chilled water temperature) are compared: the conventional control strategy of constantly fixing ChWT and the OAT (outdoor air temperature) compensation control strategy that adjusts ChWT according to the changes in OAT. OAT compensation control strategy was modeled and realized based on Appendix G of ASHRAE Standard 90.1. It was confirmed that applying OAT compensation control strategy can significantly reduce chiller energy consumption, which accounts for the largest portion of total cooling energy consumption. It was found that the difference in total cooling energy consumption between applying the conventional control of constantly fixing ChWT to 6 °C and applying the OAT compensation control was approximately 8 % and 3 % during spring (March to May) and summer (June to August), respectively. Additionally, during the fall (September–November) period, about 7 % of total cooling energy consumption could be saved.

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KW - Chilled water temperature set-point

KW - Cooling energy

KW - Outdoor air temperature compensation control

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Chilled water temperature set-point reset based on outdoor air temperature and its cooling energy performance in an office building

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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