Scientists in Saudi Arabia have simulated a solar energy-driven single-effect absorption system that uses water-lithium bromide as a work fluid, under the environmental conditions of Riyadh. Exergy and exergy speeds are calculated for each level of the system, where optimum generator performance is found to peak at 80 C.
A researcher of Saudi Arabia’s University of Ha’il has performed an exergy and energy analysis of a PV-driven single-effect Absorptic System (SEAC) that uses water-lithium bromide (Hepero-Libr) as the working liquid pair.
The working liquid couple is a central part of a SAC, with heat instead of electricity to create cooling. “Lay pressure cooling vapor is released from the evaporator and is then absorbed by the liquid strong solution of the absorber,” explained researcher Naif Khalaf Alshammari. “The pump then collects the liquid weak solution of the absorber, increases its pressure and transports it to the generator. Cooling vapor escapes from the weak solution in the generator due to the heat of a high temperature source.
The system was analyzed under the environmental conditions of Riyad, the capital of Saudi Arabia. The absorption system was divided into 18 levels, calculated with exergy and exergies for each condition with the help of empirical comparisons and input parameters. The parts of the system are an absorber, an evaporator, a generator, a condenser, a heat exchanger, a pump and two expansion valves.
An engineering comparison solver (EES) software was used to perform the simulation, responsible for the thermo-physical characteristics of the liquids used in the procedure. “The first and second laws of thermodynamics, together with the preservation of the mass principle, are applied to every system component in the thermodynamic examination of the absorption system,” the researchers said. “With regard to heat breakdown mission, inlet and output flows and work interaction, each element functions as a control volume.”
Image: University of Ha’il, Journal of Engineering Research, CC by 4.0
Results of the simulation revealed that reducing the absorber temperatures improves the performance coefficient (COP) and exergy efficiency. More specific peaks optimum generator performance at 80 ° C, because they balance the COP and the Exergie Efficiency, with levels ranging from 0.52-0.78 and 0.11-0.68 respectively.
“Exergy destruction is dominated by the generator (52% of the total losses), followed by the absorber and condenser, underlines the need for targeted optimization of components,” the results showed. “In addition, rising ambient temperatures (25-50 C) slightly reduce the COP but improve the exergy efficiency, which emphasizes the considerations between the performance of the first and second law.”
If the newspaper concludes the article ashammari said that “by bridging the gap between theoretical analysis and practical application, this study contributes to the development of efficient, scalable and environmentally friendly cooling systems that offer a path to reduce dependence on conventional vapor compressions and promote the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the accptation of the ACPPETTERATION OF Energieiette Technologies.” ””
The results were presented in “An examination of the exergy and energy of a solar energy-driven absorption system in the Riyadh climatePublished in the Journal of Engineering Research.
This content is protected by copyright and may not be reused. If you want to work with us and reuse part of our content, please contact: editors@pv-magazine.com.
Popular content
