Energy and Exergy Assessment of a Solar Driven Single Effect H 2 O-LiBr Absorption Chiller Under Moderate and Hot Climatic Conditions

Mamadou Sow and Lavinia Grosu ()
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Mamadou Sow: Laboratory of Energetics Mechanics and Electromagnetism, University of Paris Nanterre, 50 rue de Sèvres, 92410 Ville d’Avray, France
Lavinia Grosu: Laboratory of Energetics Mechanics and Electromagnetism, University of Paris Nanterre, 50 rue de Sèvres, 92410 Ville d’Avray, France

Energies, 2025, vol. 18, issue 17, 1-21

Abstract: This work mainly focuses on the energy and exergy analysis of a single-effect absorption cooling system operating with the couple H 2 O-LiBr, under different climatic conditions in Senegal and France. A simulation model was developed, using the Engineering Equation Solver V10 (EES) software. Results indicate that the system can achieve a maximum COP of 0.76 and an exergy efficiency of 56%, which decreases as the generator temperature increases. Increasing the generator temperature from 87 to 95 °C significantly improves COP, but gains become marginal beyond 100 °C. The highest exergy destruction occurs in the generator, followed by the absorber, condenser, and evaporator. A temperature difference above 44 °C between the generator and the absorber is required to maintain H 2 O-LiBr solution stability. Optimal temperatures for hot climates like Senegal are 90 °C (generator), 42 °C (absorber/condenser), and 7 °C (evaporator), while maximum exergy efficiency (56%) is reached at 81 °C, typical of moderate climates (France). Evaporator exergy efficiency increases from 16 to 52% with rising ambient temperature, while absorber and condenser efficiencies drop. Increasing the cooling water flow rate from 0.2 to 1.4 kg/s reduces exergy losses in the absorber and the condenser by up to 36%. The solution heat exchanger (SHE) optimal effectiveness of 0.75 reduces exergy consumption in the absorber and the generator.

Keywords: absorption chiller; energy; exergy; solar cooling; H 2 O-LiBr; single effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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