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Exergy analysis of a water heat storage tank

Dammel, Frank and Winterling, Jella and Langeheinecke, K.-J. and Stephan, Peter (2012):
Exergy analysis of a water heat storage tank.
In: Proceedings Comsol Conference, [Conference or Workshop Item]

Abstract

A combined heat and power (CHP) plant generates both electricity and useful heat. A heat storage tank enables a decoupling of electricity and heat delivery. In this study a cylindrical hot water storage tank is considered. Charging, holding time and discharging are numerically simulated applying COMSOL Multiphysics 4.2. The performance of the heat storage is evaluated by an exergy analysis. Exergy is the work potential of a given amount of energy and thus the ``valuable fraction'' of energy. Performing simulations with three different models, the contribution of heat conduction in the tank wall and heat losses to the environment on the overall exergy loss were determined. Both effects are almost negligible during charging, but dominate during holding time.

Item Type: Conference or Workshop Item
Erschienen: 2012
Creators: Dammel, Frank and Winterling, Jella and Langeheinecke, K.-J. and Stephan, Peter
Title: Exergy analysis of a water heat storage tank
Language: English
Abstract:

A combined heat and power (CHP) plant generates both electricity and useful heat. A heat storage tank enables a decoupling of electricity and heat delivery. In this study a cylindrical hot water storage tank is considered. Charging, holding time and discharging are numerically simulated applying COMSOL Multiphysics 4.2. The performance of the heat storage is evaluated by an exergy analysis. Exergy is the work potential of a given amount of energy and thus the ``valuable fraction'' of energy. Performing simulations with three different models, the contribution of heat conduction in the tank wall and heat losses to the environment on the overall exergy loss were determined. Both effects are almost negligible during charging, but dominate during holding time.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Event Title: Proceedings Comsol Conference
Date Deposited: 17 Mar 2015 14:49
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