Jensen, J. Kjær

Markussen, W. Brix

Pedersen, R. Cilius

Wolf, C. Mikael

In Denmark, the goal is to have a carbon neutral energy sector by 2050, which means that the fossil based district heat production of today should be replaced by renewable energy sources. A potential way to do this is to utilise geothermal energy which is a promising reliable renewable energy source. In the present work, an absorption heat transformer utilising geothermal energy for district heat production was therefore investigated. An advanced exergy analysis was performed, which is a design tool, that can give knowledge on the irreversibilities and improvement potential of the system, otherwise not possible using conventional exergy analyses. The advanced exergy analysis concluded that the absorber and generator are responsible for most of the exergy destruction in the system and most of it is unavoidable endogenous exergy destruction. The analysis revealed that the evaporator and condenser had the highest potential for optimisation. It was seen that the absorber and generator benefit from other components operating at lower efficiency, including the evaporator and condenser. Therefore, optimisation of the system would lead to trade-offs between the performance of individual components. It was however possible to reduce the overall exergy destruction with up to 9% by improvement of components to their maximum technical performanc

Advanced Exergy Analysis of an Absorption Heat Transformer Using Geothermal Heat for District Heat Production: A Case Study

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