Thermodynamic Analysis of an Absorption/Compression Refrigeration System Using Geothermal Energy

E Nehdi,L Kairouani

doi:10.3844/ajassp.2005.914.919

Abstract

This article presents the potential use and exploration of geothermal energy for cooling applications using a combined absorption/compression system. The considered system uses R134a for the compression part and the cool water-ammonia for the absorption part of the installation. The geothermal temperature source is in the range 343-349K, the condensation temperature is 308 K, and in order to produce ice, the R134a evaporation temperature is 263 K. The COP is about 5.4. Therefore, based on the typical geothermal energy sources in Tunisia which present a refrigeration potential power of 9.1 MW, the quantity of ice that could be produced is about 82 tons per hour. The greenhouse gas emissions should thus be reduced by about 5884 tons of CO2 per year, which represents (59%).

Highlights

Geothermal wells which show the most favorable thermodynamic characteristics, such as the highestGeothermal energy accounts for 2% of the world temperatures and flows, are localized in the area of power consumption[1].It is used in multiple Chotts: Kebili, Tozeur and El Hamma
The thermodynamic characteristics and physicochemical analysis of the water are indicated in Considering the importance of this renewable Table 1 and 2
We find the heat pumps with absorption[4,5,6,7,8,9,10], air-conditioning with absorption[11, 12] and other passive applications

Summary

INTRODUCTION

Geothermal wells which show the most favorable thermodynamic characteristics, such as the highest. Geothermal energy accounts for 2% of the world temperatures and flows, are localized in the area of power consumption[1]. It is used in multiple Chotts: Kebili, Tozeur and El Hamma In order to produce cold at negative temperatures, the studied cycle is formed by the association of ammonia-water absorption loop, supplied with geothermal water, and of vapor compression loop, using R134a like refrigerant (Fig. 1). The coefficient of performance of the vapor compression loop is noted, COPR134a:

Limaguess NCI8 Kebili

Findings

CONCLUSION