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ENERGY AND EXERGY ANALYSIS OF A DOUBLE STAGE HYBRID HEAT PUMP OPERATING WITH WATER AMMONIA

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.1140
pages 1517-1526

Nahla Bouaziz
Unite de Recherche Energetique & Environnement, Ecole Nationale d'Ingenieurs de Tunis. Universite de Tunis El Manar, BP37, le Belvedere 1002, Tunisia; Institut Preparatoire aux etudes d'ingenieurs El Manar, Campus Universitaire, 2092 Tunis El Manar, Tunis

Dorra Lounissi
Unité de Recherche Energétique & Environnement, Ecole Nationale d'Ingénieurs de Tunis. Université de Tunis El Manar, BP37, le Belvédère 1002, Tunisia

Ridha Ben Iffa
Unité de Recherche Energétique & Environnement, Ecole Nationale d'Ingénieurs de Tunis. Université de Tunis El Manar, BP37, le Belvédère 1002, Tunisia

Abstract

The objective of this work is to present an energy and exergy analysis of a novel configuration of absorption cooling system operating at low enthalpy sources. The double stage cycle developed in the present work is operating with water-ammonia. In this investigation, a modelisation and simulation of the proposed configuration is carried out. A thermodynamic model based on the mass energy and exergy balances are developed for this purpose. Numerical results obtained have been compared with those relative to the conventional machine. A great interest is given to estimate the refrigeration systems' performance, the exergy efficiency, the global exergy destruction in the system and the exergy destruction in each of the main components. The effects of generator, absorber, condenser and evaporator are examined on the performance of the system. The parameters analyzed are the COP, the irreversibility and the exergetic efficiency. The study reveals that the performances of the novel configuration are better than the two stage conventional configuration. Besides, it allows a lower operating temperature, about 60-120 °C in steed of 100-160 °C for the conventional cycle.

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