Journal of the Architectural Institute of Korea Planning & Design (대한건축학회논문집:계획계)

Architectural Institute of Korea (대한건축학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of Energy Savings Applying Energy Efficient Control of Variable Speed Pump in HVAC Hydronic Systems

변속 펌프의 에너지 효율 제어를 통한 HVAC 수배관 시스템의 에너지 절감

  • 김서훈 (한남대 건축공학과 대학원) ;
  • 곽노열 (한남대학교 건축학부)
  • Received : 2011.08.03
  • Published : 2012.02.25
⟨ Previous Next ⟩

Abstract

This paper presents the optimal control strategies for variable speed control systems in office building HVAC hydronic systems to improve their energy efficiencies. It is necessary to prepare a method for reducing energy through efficient energy management on such equipments. In case of regular building, a problem of wasting energy is caused as there is no control on disutility due to degradation of chiller's performance by applying a constant water volume control system of a constant speed pump to HVAC hydronic system, pump power is wasted under part load operating condition, and there is no change of flow according to load variation. This study applied two strategies for controling energy efficiency through optimal control and operation of pumps of flow according to load variation by applying variable speed control to circulating pumps of the HVAC hydronic system. The first strategy for energy efficiency control is to reduce energy used in circulation part of the HVAC hydronic system through pump sequence control and operating number control by applying wire-to-water efficiency control of pumps. And the second one is an energy efficiency control strategy which controls speed of pumps which circulates and provide flow responding to the load through pressure different setpoint optimal control by using open signals of flow control valves with factors for operating optimal control of HVAC circulation pump system. The results showed that about 6.7-11.9% of heat source energy and 24.4-44.2% of pump energy could be saved by using these optimal control strategies.

Keywords

Acknowledgement

Supported by : 한남대학교

References

  1. 국토해양부,친환경 건축물 인증/개정안, 국토해양부고시 제2010-301호, 2010
  2. Zhenjun Ma, Shengwei Wang, Energy efficient control of variable speed pumps in complex building central air-conditioning systems Energy and Buildings 41, p.p. 197-205, 2009 https://doi.org/10.1016/j.enbuild.2008.09.002
  3. J.B. Rishel, Wire-to-water efficiency of pumping systems, ASHRAE Journal 43,p.p. 40-46, 2001
  4. L. Lu, W.J, HVAC system optimization-in building section, Energy and Buildings 37, p.p. 11-22, 2005 https://doi.org/10.1016/j.enbuild.2003.12.007
  5. X.Q. Jin, Z.M. Du, X.K. Xiao, Energy evaluation of optimal control strategies for central VWV chiller systems, Applied Thermal Engineering 27, p.p. 934-941, 2007 https://doi.org/10.1016/j.applthermaleng.2006.08.015
  6. U.S. Department of Energy, Measurement and Verification for Federal Energy Projects Version 1.0, Energy Efficiency and Renewable Energy, p.p. 49-55, 2008
  7. ASHRAE Handbook-HVAC Applications, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, 41, p.p. 37-40, 2007