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2021 Vol.15, Issue 6 Preview Page

Research Article

The Analysis of Energy Saving for Domestic Hot Water Using Drain Water Heat Recovery System

열회수 배수장치의 급탕에너지 절감효과 분석

Seok-Ho Hwang1*
황 석호1*
1Associate Professor, School of Architecture, Kyungnam University, Changwon, Korea
1경남대학교 건축학부 건축공학전공 부교수
*Corresponding Author
30 December 2021. pp. 747-756
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Abstract

Drain Water Heat Recovery (DWHR) or Waste Water Heat Recovery (WWHR) system is a heat recovery from waste drain water flow and preheat the incoming cold water. This system has been shown to be a viable method of improving the building energy efficiency. This paper investigates the energy saving potential for shower water heat recovery system in residential building. Horizontal system of DWHR was considered because it can be installed under a shower booth and easy access to drain and cold water. The heat energy exchange rate is evaluated using the effectiveness-NTU method. Heat transfer effectiveness was calculated by U-value and area of heat exchanger and drain water flow rate. When a flow rate is 7.5 l/min using heat exchanger has 450 W/m2K U-value and 7 m length, it was possible to save about 20% water heating energy.

Keywords
Drain water heat recovery
effectiveness-NTU
Heat exchanger
Domestic hot water heating energy
키워드
열회수 배수장치
유용도-전달단위수
열교환기
급탕에너지
References
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2
Kim, J.S. (1998). New Technology : Drain water heat recovery in a residential building. Journal of the KSME, 38(4), 21.
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Moon, S.B., Hyun, M.T., Heo, J.H., Lee, D.W., Lee, Y.G. (2019). An Evaluation of Heating Performance of the Heat Pump System Using Wasted Heat from Thermal Effluent for Greenhouse Facilities in Jeju. Journal of Energy Engineering, 28(1), 22-29.
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Wong, L., Mui, K., Guan, Y. (2010). Shower water heat recovery in high-rise residential buildings of Hong Kong. Appl. Energy, 87, 703-709. 10.1016/j.apenergy.2009.08.008
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Cordella, M., Garbarino, E., Calero, M., Mathieux, F., Wolf, O. (2014). MEErP Preparatory Study on Taps and Showers. European Commission Joint Research Centre Report.
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Kimmels, A. (2011). Shower Heat Recovery - Overview of Commercially Available DWHR Systems. Meander Heat Recovery (http://www.meanderhr.com/).
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Jeong, S.W. (2006). Study on the Characteristics of Hot Water Supply Consumption in Apartment Housing with District Heating System : In the Case Study of Goyang City Only. M.S. Thesis, Seoul National University of Technology, Graduate School of Housing.
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 : 15
  • No :6
  • Pages :747-756
  • Received Date : 2021-11-22
  • Revised Date : 2021-12-09
  • Accepted Date : 2021-12-09
  • DOI :https://doi.org/10.22696/jkiaebs.20210063
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