Abstract
A thermodynamic analysis of a half-effect absorption cooling system powered by a low-enthalpy geothermal source was carried out. This paper presents modeling of the half-effect absorption cooling system operating with an ammonia/lithium nitrate mixture and based on the first and second laws of thermodynamics, using as energy inputs real data from two geothermal wells located at Las Tres Vírgenes volcanic complex, Baja California Sur, México. Plots of coefficients of performance and exergy efficiency against condenser, evaporator, and generator temperatures are presented for the half-effect cooling system. The results showed that the system was able to operate at generation temperatures between 56 and 70 °C, which were supplied by the geothermal wells in order to produce cooling at temperatures as low as −16 °C, achieving coefficients of performance between 0.10 and 0.36, while the exergy efficiency varied from 0.15 to 0.40 depending on the system operating temperatures.
Highlights
Conventional vapor-compression cooling systems require large amounts of electrical energy to operate: This promotes energy consumption based on fossil fuels [1]
coefficient of performance (COP) values half-effect were from values for half-effect cooling systems were from 0.408 to 0.435; and the maximum exergy efficiency was from 14.7% to 22.6%
This paper proposes a half-effect absorption system powered by a geothermal resource for
Summary
Conventional vapor-compression cooling systems require large amounts of electrical energy to operate: This promotes energy consumption based on fossil fuels [1]. Despite the vast of low-to-medium electricity generation low-temperature heat), low energy conversion and high temperature geothermal(by resources, they are not being used because there are efficiency, technical limitations investment production [5,6]. Air of conditioning absorption systems operate systems are some the most interesting devices, since they withlow-to-medium environmentally clean working fluids[8].and require lowerabsorption electricitysystems consumption than use temperature heat sources. Absorption systems can be used forsystems, large-scale applications, negligible of respect electrical energy, and they have few mechanical parts [10]: This is an their cost is amount lower with to other thermally driven systems, they consume a negligible amount environmentally friendly method order to produce air [10]: conditioning.
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