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Understanding and modeling of mass and heat transfer mechanisms in absorption cycles

Technological challenge: Energy efficiency for smart buildings, electrical mobility and industrial processes (learn more)

Department: Département Thermique Conversion et Hydrogène (LITEN)

Laboratory: Laboratoire des technologie thermodynamqiues et solaires

Start Date: 01-10-2022

Location: Grenoble

CEA Code: SL-DRT-22-0596

Contact: haitrieu.phan@cea.fr

Nowadays, the needs for air conditioning are on the rise: 10% of electricity worldwide would be used for air conditioning and this consumption is likely to triple by 2050. The absorption chiller is an effective solution to reduce electricity consumption by valorizing renewable or waste heat sources. L2TS laboratory is developing the technology of NH3/ H2O, which has the advantage of great flexibility thanks to the possibilities of producing cold down to -30 °C or heat up to 70 °C. In collaboration with LOCIE laboratory, an innovative numerical tool has been developed to simulate absorption and desorption processes, with the flows either in configuration of co-current or counter-current in heat exchangers. The objective of this thesis is to go further in the understanding with a more detailed modeling of heat and mass transfers in different components of an absorption cycle. This tool will be then used to design heat exchangers with high accuracy, in particular during the development of the new absorption machine for co-production of cold and heat.

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