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Étude de pompes à chaleur à absorption multi-fonctions pour les sous-stations de réseaux de chaleur

Abstract : This work studies the opportunity to integrate absorption heat pumps (AHP) in substations of district heating networks (DHN). The challenge is to improve the energy efficiency of DHN and to allow better integration of renewable energies. Three AHP operating modes are possible to satisfy the needs of buildings throughout the year by using DHN heat, by : (i) locally increasing the available temperature of the DHN to satisfy the high-temperature heating needs of buildings, for example from a lowtemperature DHN; (ii) air conditioning of the buildings from the heat of the DHN, for example in summer; (iii) improving the heat transfer between the DHN and the building. To compare the performances reached with several absorbent-refrigerant pairs, a steady-state model was developed. The model simulates the AHP under typical operating conditions of DHN substations for the three considered operating modes. According to the model, the NH3-LiNO3 pair was identified as the most relevant one. Then, a dynamic model was developed to simulate the system under varying operating conditions. An experimental prototype with 3 kW cooling capacity was dimensioned, built and tested with the NH3-LiNO3 couple, to validate the feasibility of the concept, quantify its performance and validate the numerical model. Following this validation, the model was used to study the relevance of the use of AHP in DHN substations to satisfy the heating and cooling needs, improve the DHN performances and promote integration of new low temperature renewable energy sources.
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Submitted on : Monday, June 28, 2021 - 4:50:38 PM
Last modification on : Tuesday, June 29, 2021 - 3:07:10 AM
Long-term archiving on: : Wednesday, September 29, 2021 - 7:58:29 PM


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  • HAL Id : tel-03272907, version 1



Gaétan Chardon. Étude de pompes à chaleur à absorption multi-fonctions pour les sous-stations de réseaux de chaleur. Thermique [physics.class-ph]. Université Savoie Mont blanc, 2021. Français. ⟨NNT : ⟩. ⟨tel-03272907⟩



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