Energy and exergy analysis of a pilot plant for the combined production of cooling and electricity from a low temperature heat source through an absorption process - Archive ouverte HAL
Communication Dans Un Congrès Année : 2022

Energy and exergy analysis of a pilot plant for the combined production of cooling and electricity from a low temperature heat source through an absorption process

Résumé

Research and development efforts are made worldwide in finding new, more efficient energy conversion technologies using renewable or recovery sources. In this context, absorption processes are well suited for the use of energy at low temperatures (80°C – 200°C) for the production of cooling and mechanical work. The present work focuses on an innovative cold and electricity combined production system based on an ammonia-water absorption chiller coupled to an axial turbine. The study is based on an experimental pilot plant of 10 kW thermal power input at the ammonia vapour desorber, to which the integration of a partial admission turbo-expander for the production of mechanical work is under investigation. A 1D model of the turbine validated on CFD simulations is integrated in a validated model of the absorption machine and used to conduct an analysis of the interactions between the turbine and the cycle that contains it. The constraints imposed by the expander (vapour quality, relationship between flowrate and pressure) are highlighted and the use of a throttling process is evaluated as a way to add flexibility. A parametric analysis is performed changing the operating conditions to investigate the energy performance of the cycle. Subsequently, an exergy analysis is undertaken, for both the simple absorption and combined cycle configuration, to identify the components where most of the exergy destruction takes place and to find the hot source temperature maximizing exergy efficiency for fixed operating conditions. The results obtained provide reliable insights on the integration of this type of expander in an absorption cycle.
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Dates et versions

hal-04620413 , version 1 (21-06-2024)

Identifiants

  • HAL Id : hal-04620413 , version 1

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Simone Braccio, Alessia Arteconi, Hai Trieu Phan, Nicolas Tauveron, Nolwenn Le Pierrès. Energy and exergy analysis of a pilot plant for the combined production of cooling and electricity from a low temperature heat source through an absorption process. ECOS 2022, Jul 2022, Copenhague, Denmark. ⟨hal-04620413⟩
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