TU Darmstadt / ULB / TUbiblio

Exergy analyses of heat supply systems for a building cluster with CARNOT

Falk, Paul Michael and Dammel, Frank and Stephan, Peter (2017):
Exergy analyses of heat supply systems for a building cluster with CARNOT.
In: International Journal of Thermodynamics, pp. 191-198, 20, ISSN 1301-9724,
DOI: 10.5541/eoguijt.299926,
[Online-Edition: http://dergipark.gov.tr/download/issue-file/7011],
[Article]

Abstract

In this paper, a model to simulate community heating systems is presented and energy and exergy analyses are conducted for a district heating system with three different heat generation alternatives. The alternatives are a gas boiler system, a system assisted by solar thermal collectors with a seasonal thermal energy storage and a gas boiler as backup, and a system with geothermal borehole heat exchangers combined with a heat pump. The heat supply of a building cluster of 11 buildings is dynamically modeled using the MATLAB/Simulink based toolbox CARNOT. The aim is to match the low exergy heating demand with a low exergy heat source. To cover an energy demand of 263.7 MWh/a, the geothermal system needs 174.0 MWh/a of exergy, the solar thermal system 269.2 MWh/a of exergy and the gas boiler system 324.9 MWh/a. A parameter study of the solar thermal system shows better results for lower supply temperatures and a lower heat loss coefficient k, but the results depend strongly on the chosen storage size. It was found that the use of fossil fuel could be reduced by 43.8% for the geothermal system and by 17.6 % for the solar thermal system compared to the gas boiler system.

Item Type: Article
Erschienen: 2017
Creators: Falk, Paul Michael and Dammel, Frank and Stephan, Peter
Title: Exergy analyses of heat supply systems for a building cluster with CARNOT
Language: English
Abstract:

In this paper, a model to simulate community heating systems is presented and energy and exergy analyses are conducted for a district heating system with three different heat generation alternatives. The alternatives are a gas boiler system, a system assisted by solar thermal collectors with a seasonal thermal energy storage and a gas boiler as backup, and a system with geothermal borehole heat exchangers combined with a heat pump. The heat supply of a building cluster of 11 buildings is dynamically modeled using the MATLAB/Simulink based toolbox CARNOT. The aim is to match the low exergy heating demand with a low exergy heat source. To cover an energy demand of 263.7 MWh/a, the geothermal system needs 174.0 MWh/a of exergy, the solar thermal system 269.2 MWh/a of exergy and the gas boiler system 324.9 MWh/a. A parameter study of the solar thermal system shows better results for lower supply temperatures and a lower heat loss coefficient k, but the results depend strongly on the chosen storage size. It was found that the use of fossil fuel could be reduced by 43.8% for the geothermal system and by 17.6 % for the solar thermal system compared to the gas boiler system.

Journal or Publication Title: International Journal of Thermodynamics
Volume: 20
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative
Exzellenzinitiative > Graduate Schools
Exzellenzinitiative > Graduate Schools > Graduate School of Energy Science and Engineering (ESE)
Date Deposited: 13 Feb 2018 16:32
DOI: 10.5541/eoguijt.299926
Official URL: http://dergipark.gov.tr/download/issue-file/7011
Related URLs:
Export:
Suche nach Titel in: TUfind oder in Google

Optionen (nur für Redakteure)

View Item View Item