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2023 Vol.17, Issue 5 Preview Page

Research Article

An Algorithm Development of Free Cooling Operation Period Extension for Improving Cooling Performance in Water-side Economizer System

Water-side economizer 시스템의 냉방 성능 향상을 위한 Free cooling 운전 기간 확대 알고리즘 개발

Kwang-Hee Kim1
,
Yu-Jin Kim2
,
Young-Hak Song3*
김 광희1
,
김 유진2
,
송 영학3*
1Undergraduate Student, Department of Architectural Engineering, Gyeongsang National University, Jinju, Korea
2Doctor’s Course, Graduate School, Department of Architectural Engineering, Gyeongsang National University, Jinju, Korea
3Professor, Department of Architectural Engineering, ERI, Gyeongsang National University, Jinju, Korea
1경상국립대학교 건축공학과 학부생
2경상국립대학교 건축공학과 박사과정
3경상국립대학교 건축공학과 교수
*Corresponding Author
30 October 2023. pp. 296-307
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Abstract

As demand for data centers is increasing, the importance of reducing cooling energy is emphasized. In this paper, a free cooling operation period extension algorithm has been developed based on the flow rate control in the WSE (Water-side economizer) system to improve the cooling performance of data centers. In order to increase the supply and return temperature of chilled water and reduce the cooling tower approach temperature that determines the free cooling period, CRAH (Computer room air handler) airflow, chilled water flow rate, cooling tower flow control sequence was presented. As a result, the energy consumption of the chiller decreased by 28% per year, and the free cooling operation increased by 1,324 hours. Since the developed algorithm control the operating variables of loops that make up a general cooling system and heat exchange between multiple loops, it is expected to have high scalability that can be applied to buildings and cooling systems with different conditions.

Keywords
WSE system
Free cooling
Fan air flow
Chilled water flow
Condenser water flow
키워드
외기냉수냉방 시스템
프리 쿨링
팬 풍량
냉수 유량
냉각수 유량
References
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Choi, Y., Park, B. (2018). Analysis of Air Conditioning Methods for Providing Optimal Thermal Environment in Data center. Journal of KIEAES, 18(6), 97-102. 10.12813/kieae.2018.18.6.097
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Ha, J., Kim, Y., Kim, H., Song, Y. (2021). Development of Control Algorithm for cooling Tower Low-Apporach Temperature. Journal of KIAEBS, 15(5), 431-442.
3
Kim, Y., Song, Y., Kim, H. (2023). Fan Flow Control of Cooling Towerwith Water-side Economizer for Free cooling Period Expansion. Journal of KIAEBS, 17(3), 157-165.
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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 : 17
  • No :5
  • Pages :296-307
  • Received Date : 2023-09-19
  • Revised Date : 2023-10-21
  • Accepted Date : 2023-10-30
  • DOI :https://doi.org/10.22696/jkiaebs.20230025
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