Abstract
The present work is to analyze a two-stage cycle based on the ammonia-water absorption system, with intermediate compression. The two generators of the system are heated by geothermal energy at low temperature. The study shows that this system makes it possible at lower generator temperature, under the limits permitted by the systems suggested up to now. For Tg = 335 K, Tc = Ta = 308 K and Te = 263 K, based on the electric consumption, the system efficiency is 8.2. The comparative study of the hybrid system and vapor compression systems shows the superiority of the proposed system. Supplied by the geothermal sources of the Tunisian south, the system makes it possible to obtain for a pilot geothermal station, a production of 75 tons of ice per day. The greenhouse gas emissions should thus be reduced by about 2.38 tons of CO2 per day. Therefore, based on the typical geothermal energy sources in Tunisia which present a global refrigeration potential of 4.4 MW, the daily quantity of ice that could be produced is about 865 tons. The greenhouse gas emissions should thus be reduced by about 10,000 tons of CO2 per year.
Highlights
To ensure the operation of a single stage ammonia-Several research tasks were carried out, for a suitable exploitation of geothermal energy
This exploitation is carried out by means of systems, either by absorption, or absorption/compression[1,2,3,4,5,6,7,8,9]. Among hybrid these applications one quotes the heat pumps with absorption and air-conditioning with absorption. To develop these energies at low temperature, this study proposes the use of a hybrid system with absorption/compression using couple ammoniawater, for the production of ice, with relatively low temperatures in the generator of approximately 335 water absorption system, in the conditions (Ta = Tc = 308 K, Te=263 K and ∆x=0.1), the generator temperature must exceed 378 K, Fig. 1
In this study we propose the integration of a compressor insert between two-stage of absorption, which function at the same pair of temperature (Tg, Ta)
Summary
Several research tasks were carried out, for a suitable exploitation of geothermal energy. Among hybrid these applications one quotes the heat pumps with absorption and air-conditioning with absorption To develop these energies at low temperature, this study proposes the use of a hybrid system with absorption/compression using couple ammoniawater, for the production of ice, with relatively low temperatures in the generator of approximately 335 water absorption system, in the conditions (Ta = Tc = 308 K, Te=263 K and ∆x=0.1), the generator temperature must exceed 378 K (higher than the actual geothermal temperature source), Fig. 1. Unité de Recherche Energétique et Environnement, Ecole Nationale d’Ingénieurs de Tunis, B.P 37 Le Belvédère 1002, Tunis, Tunisia
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