Gains énergétiques globaux par installation de pompes à chaleur dans un procédé agro-alimentaire

Rabih Murr 1
1 CEP/Paris
CEP - Centre Énergétique et Procédés
Abstract : The improvement of energy efficiency in the industry is essential in achieving the objective of mitigation of greenhouse gases. In the agro food process industry, lukewarm effluents are rejected to drain. Recovering heat from these effluents by using preheating exchangers and heat pumps (HP) allows providing heat at higher temperature levels (like cleaning solutions and hot sanitary water) and replacing boilers. These needs may concern batch and semi-batch processes. Storage tanks are therefore used together with heat pumps. The optimization of heat pumps and storage tanks sizes is a multi-objective method. This method is based on a thermodynamic criterion (calculating the exergy destruction in the system) and an economic criterion (calculating the payback period, the cost of investment and the operating cost, and integrating the environmental impact). The dynamic exergy analysis shows that using two separated storage tanks (variable volume and uniform temperature tanks) is better than one tank (constant volume stratified storage tank). On the other hand, a multi-criteria method is used to design heat pumps in order to maximize its performances. It allows designing optimal mixtures of refrigerants. These choices are validated experimentally with a heat pump prototype. Finally, the economic and environmental gains obtained with the heat pump compared to a fuel boiler are quantified for all heat demands.
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Rabih Murr. Gains énergétiques globaux par installation de pompes à chaleur dans un procédé agro-alimentaire. Sciences de l'ingénieur [physics]. Ecole Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0031⟩. ⟨tel-01145456⟩

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