This paper presents an exergetic analysis of the operating conditions of a shallow horizontal ground source heat pump. The analysis is conducted through theoretical evaluation of the exergy potential and the evaluation of the main sources of unavoidable irreversibilities. This approach can be used to select the optimal installation depth. A simple model is used for second law analysis. The model only considers a two dimensional domain of a single pipe, instead of the full ground heat exchanger. The analysis of a real installation in then considered. This is a horizontal ground heat exchanger, constituted of a network of pipes installed 1 m below the surface, covering an area of about 210 m2. A comparison of the current installation with a deeper installation, 2 m below the surface, shows that the exergy output can be increased of more than 60%. This improvement can be easily compared with the increase of installation costs in order to evaluate the optimal depth.

Second law analysis of horizontal geothermal heat pump systems / Verda, Vittorio; Cosentino, Sara; LO RUSSO, Stefano; Sciacovelli, Adriano. - ELETTRONICO. - 1:(2014), pp. 299-306. (Intervento presentato al convegno 27th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems tenutosi a Turku, Finland nel 15-19 giugno 2014).

### Second law analysis of horizontal geothermal heat pump systems

#### Abstract

This paper presents an exergetic analysis of the operating conditions of a shallow horizontal ground source heat pump. The analysis is conducted through theoretical evaluation of the exergy potential and the evaluation of the main sources of unavoidable irreversibilities. This approach can be used to select the optimal installation depth. A simple model is used for second law analysis. The model only considers a two dimensional domain of a single pipe, instead of the full ground heat exchanger. The analysis of a real installation in then considered. This is a horizontal ground heat exchanger, constituted of a network of pipes installed 1 m below the surface, covering an area of about 210 m2. A comparison of the current installation with a deeper installation, 2 m below the surface, shows that the exergy output can be increased of more than 60%. This improvement can be easily compared with the increase of installation costs in order to evaluate the optimal depth.
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2014
978-1-63439-134-4
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/11583/2655226`
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