Energy analysis of a diffusion absorption cooling system using lithium nitrate, sodium thiocyanate and water as absorbent substances and ammonia as the refrigerant

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.

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Analytical Model for the Prediction of Performance of a Solar Driven Diffusion Absorption Cooling System

International Journal of Thermodynamics ◽

10.5541/ijot.929863 ◽

2021 ◽

Vol 24 (4) ◽

pp. 42-48

Author(s):

Bella GUREVİCH ◽

Amir ZOHAR

Keyword(s):

Analytical Model ◽

Cooling System ◽

Absorption Cooling ◽

Absorption Cooling System ◽

Diffusion Absorption

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Integration of the Experimental Results of a Parabolic Trough Collector (PTC) Solar Plant to an Absorption Air-Conditioning System

Applied Sciences ◽

10.3390/app8112163 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2163 ◽

Cited By ~ 4

Author(s):

Yuridiana Galindo Luna ◽

Wilfrido Gómez Franco ◽

Ulises Dehesa Carrasco ◽

Rosenberg Romero Domínguez ◽

José Jiménez García

Keyword(s):

Cooling System ◽

Operating Conditions ◽

Experimental Results ◽

Coefficient Of Performance ◽

Lithium Nitrate ◽

Parabolic Trough ◽

Parabolic Trough Collector ◽

Absorption Cooling ◽

Parametric Analyses ◽

Absorption Cooling System

The present study reports the experimental results of a parabolic trough collector field and an absorption cooling system with a nominal capacity of 5 kW, which operates with the ammonia-lithium nitrate mixture. The parabolic trough collectors’ field consists of 15 collectors that are made of aluminum plate in the reflector surface and cooper in the absorber tube, with a total area of 38.4 m2. The absorption cooling system consists of 5 plate heat exchangers working as the main components. Parametric analyses were carried out to evaluate the performance of both systems under different operating conditions, in independent way. The results showed that the solar collectors’ field can provide up to 6.5 kW of useful heat to the absorption cooling system at temperatures up to 105 °C with thermal efficiencies up to 19.8% and exergy efficiencies up to 14.93, while the cooling system operated at generation temperatures from 85–95 °C and condensation temperatures between 20 and 28 °C, achieving external coefficients of performance up to 0.56, cooling temperatures as low as 6 °C, and exergy efficiencies up to 0.13. The highest value for the solar coefficient of performance reached 0.07.

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