Energetic and Exergetic Analysis of Low and Medium Temperature District Heating Network Integration

Hongwei Li; Svend Svendsen

Abstract

In this paper, energetic and exergetic approaches were applied to an exemplary low temperature district heating (LTDH) network with supply/return water temperature at 55oC/25 oC. The small LTDH network is annexed to a large medium temperature district heating (MTDH) network. The LTDH network can be supplied through upgrading the return water from the MTDH network with a small centralized heat pump. Alternatively, the supply and return water from the MTDH network can be mixed with a shunt at the junction point to supply the LTDH network. Comparing with the second approach, the heat pump system will reduce the amount of water supply from the MTDH network and improve the system energy conversion efficiency. Through the simulation, the system energetic and exergetic efficiencies based on the two network integration approaches were calculated and evaluated.

Original language	English
Publication date	2011
Publication status	Published - 2011
Event	2nd International Exergy, Life Cycle Assessment, and Sustainability Workshop and Symposium - Nisyros, Greece Duration: 19 Jun 2011 → 21 Jun 2011 Conference number: 2 http://www.elcasnet.com/

Workshop

Workshop	2nd International Exergy, Life Cycle Assessment, and Sustainability Workshop and Symposium
Number	2
Country/Territory	Greece
City	Nisyros
Period	19/06/2011 → 21/06/2011
Internet address	http://www.elcasnet.com/

Keywords

District Heating Heat Pump Exergy

UN SDGs

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

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Cite this

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AB - In this paper, energetic and exergetic approaches were applied to an exemplary low temperature district heating (LTDH) network with supply/return water temperature at 55oC/25 oC. The small LTDH network is annexed to a large medium temperature district heating (MTDH) network. The LTDH network can be supplied through upgrading the return water from the MTDH network with a small centralized heat pump. Alternatively, the supply and return water from the MTDH network can be mixed with a shunt at the junction point to supply the LTDH network. Comparing with the second approach, the heat pump system will reduce the amount of water supply from the MTDH network and improve the system energy conversion efficiency. Through the simulation, the system energetic and exergetic efficiencies based on the two network integration approaches were calculated and evaluated.

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