Preliminary assessment of parabolic solar trough-driven ammonia-water absorption cooling system for Beirut

Comprising an eco-friendly blueprint, absorption refrigeration systems have attracted a lot of interest as they can use biomass, solar and geothermal energy sources which can mitigate climate change. The current study presents a methodology based on energy and analysis for solar-driven single-effect absorption refrigeration systems which offer a 50 kW cooling capacity. This study proposes a new mixture ratio of LiBr+LiCl (mass ratio 2:1)/H2O solution and compared it to LiBr/H2O thermodynamically. Based on the climate data of Kocaeli province in Turkey, an evacuated tube collector is employed to benefit from solar energy to meet the generator heat load of the system. Although at an evaporator temperature of 5°C, enhanced thermodynamic performance is evident with the use of the LiBr+LiCl/H2O system, and a diminished solar collector area is required compared to the system utilising LiBr/H2O, there is a level of attrition relating to the impact of the former with a single degree rise in evaporator temperature. However, this remained at a greater value than for the latter system. The final results pointed out that LiBr+LiCl/H2O has 48.93% lower circulation ratio, 8.81% higher COP of chiller, 8.88% higher solar COP, 8.96% higher exergy efficiency of chiller, 8.90% higher exergy efficiency of solar-driven system, 8.92% lower solar collector area, 8.91% lower storage tank volume than LiBr/H2O system in the investigated operating temperature ranges. The final results of the present study can be safely tested in the experimental design of single-effect absorption chillers.

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Thermodynamic Optimization of Utilization of LiBr + LiCl/H2O Solution Mixture on a Single-Effect Absorption Chiller Driven by Solar Energy

Aktemur¹,

Öztürk

2023

Journal of Solar Energy Engineering

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The interest in absorption chillers for air conditioning applications has increased recently due to the negligible electricity requirement. Especially in Turkey, where the potential of renewable energy sources such as solar energy is high, it is possible to achieve significant energy savings by utilizing absorption chillers. This study presents comprehensive energy and exergy analyses of a solar-driven single-effect absorption chiller with LiBr+LiCl/H2O (mass ratio 2:1) solution mixture. Thermodynamic optimization is carried out for the first time in this study to determine the optimum generator temperature using different absorber and condenser temperatures to maximize exergy efficiency of the absorption chiller. Also, generator temperature ranges for each absorber and condenser level are determined in this study so that the chiller using solution mixture can operate without crystallization. Coefficient of Performance, total exergy destruction rate and exergy efficiency of solar-driven absorption chiller for solar collector area of 194 m2 under a certain optimized operating condition are 0.402, 113.63 kW and 1.255%, respectively. Thanks to an alternative solution mixture compared to LiBr/H2O, the effective thermodynamic parameters can be improved and become more advantageous. The comparison results demonstrated that the thermodynamic performance of the system not only increased but also the thermal capacities and collector area decreased.

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Preliminary assessment of parabolic solar trough-driven ammonia-water absorption cooling system for Beirut

Cited by 3 publications

References 23 publications

Review on operation control of cold thermal energy storage in cooling systems

Review on operation control of cold thermal energy storage in cooling systems

Energetic and Exergetic Analysis of a Solar-Driven Single-Effect Absorption Refrigeration System Using LiBr + LiCl/H2O Solution Mixture

Thermodynamic Optimization of Utilization of LiBr + LiCl/H2O Solution Mixture on a Single-Effect Absorption Chiller Driven by Solar Energy

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