All Issue

2024 Vol.18, Issue 6 Preview Page

Research Article

A Study on the Quantification of Energy Saving Effects in Water-side Economizer Systems

외기냉수냉방 시스템의 에너지 절감 효과 정량화에 대한 연구

Se-Hyeon Kim1
,
Je-Hyeon Lee2
,
Dong-Gyu Kim3*
김 세현1
,
이 제헌2
,
김 동규3*
1Master’s Course, Graduate School, Department of Refrigeration and Air-conditioning Engineering, Pukyong National University, 45 Yongso-ro, Busan, Korea
2Assistant Professor, Department of Refrigeration and Air-conditioning Engineering, Pukyong National University, 45 Yongso-ro, Busan, Korea
3Professor, Major of smart mechanical and mobility, Pukyong National University, 365 Sinseon-ro, Busan, Korea
1부경대학교 에너지시스템공학부 냉동공조공학전공 석사과정
2부경대학교 에너지시스템공학부 냉동공조공학전공 조교수
3부경대학교 스마트융합공학부 스마트기계모빌리티전공 교수
*Corresponding Author
30 December 2024. pp. 538-550
PDF XML Citation
Abstract

The Water-side Economizer system (WSE) is mainly applied to buildings that generate annual cooling loads, and it is a method to save energy by producing chilled water using the low outdoor temperature in winter and mid-season and reducing the operation time of the chiller. Although many previous studies have been conducted, there are few cases on the verification and quantification of the effectiveness of the WSE system using actual operation data. Therefore, in this study, we introduced WSE system to the heat source system of a special laboratory located in Suwon that generates annual cooling loads, and the effectiveness verification by using actual operation data and quantify the effectiveness by simulation of the WSE system. To verify the energy saving effect of WSE system, the operation data before and after the use of the WSE system and the power consumption data stored in the Building Automation System (BAS) were compared, as a result of the verification, the power consumption of the target heat source system was reduced by 42% when the WSE system was operated compared to Chiller cooling system operated. And a physics-based simulation for the target heat source was developed and calibrated using actual operation data to improve accuracy. To quantify the annual energy saving effect of the WSE system, the average saving effect of WSE system operation according to outdoor conditions for the past five years was calculated using the calibrated simulation model. As a result, it was analyzed that the heat source system power consumption could be reduced by 52.8% through WSE system.

Keywords
Water-side Economizer system
Validation
Simulation
Energy saving
Quantification
키워드
외기냉수냉방 시스템
실증
시뮬레이션
에너지 절감
정량화
References
1

Cheung, H., Wang, S. (2019). Optimal design of data center cooling systems concerning multi-chiller system configuration and component selection for energy-efficient operation and maximized free-cooling. Renewable Energy, 143, 1717-1731.

10.1016/j.renene.2019.05.127
2

Cho, J., Kim, Y. (2021). Development of modular air containment system: Thermal performance optimization of row-based cooling for high-density data centers. Energy, 231, 120838.

10.1016/j.energy.2021.120838
3

Cho, J.K., Jeong, C.S., Kim, B.S. (2010). Viability of HVAC System for Energy Conservation in High Density Internal-load Dominated Buildings. Korean Journal of Air-Conditioning and Refrigeration Engineering, 22(8), 530-537.

4

Jin, Y., Bai, X., Xu, X., Mi, R., Li, Z. (2024). Climate zones for the application of water-side economizer in a data center cooling system. Applied Thermal Engineering, 250, 123450.

10.1016/j.applthermaleng.2024.123450
5

Kim, Y.J., Ha, J.W., Im, W.U., Kim, H.Y., Song, Y.H. (2022). Energy Efficiency Analysis on Free Cooling Operation Mode of the Water-Side Economizer System in Data Center. Journal of Korean Institute of Architectural Sustainable Environment and Building Systems, 16(1), 1-13.

6

Masanet, E., Shehabi, A., Lei, N., Smith, S., Koomey, J. (2020). Recalibrating global data center energy-use estimates. Science, 367(6481), 984-986.

10.1126/science.aba375832108103
7

Noh, J.H., Lee, J.H. (2024). Development of a DNN model using calibrated simulation for the optimal control of HVAC systems Energy and Buildings. 319, 114516.

10.1016/j.enbuild.2024.114516
8

Park, S.H. (2024). Statistical Analysis of Data-based Digital Competitiveness Trend of Korea, and Strategic Study to Achieve a Strong Data Power Country. The National Academy of Sciences, Republic of Korea, 63(1), 93-138.

9

Aum, T., Lee, S., Woo, J., Keum, B., Song, H., Jeong, W. (2016). A Case Study on Energy Savings of Waterside Economizers in District Cooling System, Korea. 2016 Summer Annual Conference of the Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK), 24-27.

10

Kim, B., Kim, Y., Kwon, Y., Choi, J., Song, M.K. (2010). Analysis of Field Operation and Energy Saving of Free Cooling System. 2010 Summer Annual Conference of the Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK), 1088-1093.

11

IPMVP Committee. (2012). International Performance Measurement and Verification Protocol; Concepts and Option for Determining Energy and Water Savings; Technical Report; Efficiency Valuation Organization; Washington, DC, USA, 2012; Volume 1.

12

ASHRAE Guideline 14-2014. (2014). Measurement of Energy and Demand Savings; Technical Report; American Society of Heating, Ventilating, and Air Conditioning Engineers.

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 : 18
  • No :6
  • Pages :538-550
  • Received Date : 2024-11-01
  • Revised Date : 2024-11-21
  • Accepted Date : 2024-12-05
  • DOI :https://doi.org/10.22696/jkiaebs.20240045
Journal Informaiton Journal of Korean Institute of Architectural Sustainable Environment and Building Systems Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
Manuscript Submission
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close