Comprehensive Fuzzy Logic Coefficient of Performance of Absorption Cooling System

2021 ◽  
pp. 116185
Author(s):  
Besim Imamović ◽  
Suad S. Halilčević ◽  
Pavlos S. Georgilakis
Keyword(s):  
Fuzzy Logic ◽  
Cooling System ◽  
Coefficient Of Performance ◽  
Absorption Cooling ◽  
Absorption Cooling System

scholarly journals Modelling and simulation of a solar absorption cooling system for India

2006 ◽  
Vol 17 (3) ◽  
pp. 65-70 ◽  
Author(s):  
V Mittal ◽  
K S Kasana ◽  
N S Thakur
Keyword(s):  
Surface Area ◽  
Cooling System ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Reference Temperature ◽  
Inlet Temperature ◽  
Solar Absorption ◽  
Absorption Cooling ◽  
Solar Absorption Cooling ◽  
Absorption Cooling System

This paper presents modelling and simulation of a solar absorption cooling system. In this paper, the modelling of a solar-powered, single stage, absorption cooling system, using a flat plate collector and water–lithium bromide solution, is done. A computer program has been developed for the absorption system to simulate various cycle configurations with the help of various weather data for the village Bahal, District Bhiwani, Haryana, India. The effects of hot water inlet temperatures on the coefficient of performance (COP) and the surface area of the absorption cooling component are studied. The hot water inlet temperature is found to affect the surface area of some of the system components. Moreover the effect of the reference temperature which is the minimum allowable hot water inlet temperature on the fraction of total load met by non-purchased energy (FNP) and coefficient of performance (COP) is studied and it is found that high reference temperature increases the system COP and decreases the surface area of system components but lower reference temperature gives better results for FNP than high reference temperatures.

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

2018 ◽  
Vol 8 (11) ◽  
pp. 2163 ◽  
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.

scholarly journals Performance of a Solar Absorption Cooling System Using Nanofluids and a Membrane-Based Microchannel Desorber

2020 ◽  
Vol 10 (8) ◽  
pp. 2761
Author(s):  
María Venegas ◽  
Néstor García-Hernando ◽  
Alejandro Zacarías ◽  
Mercedes de Vega
Keyword(s):  
Thermal Conductivity ◽  
Cooling System ◽  
Lithium Bromide ◽  
Coefficient Of Performance ◽  
Solar Thermal Energy ◽  
Solar Absorption ◽  
Absorption Cooling ◽  
Lithium Bromide Solution ◽  
Solar Absorption Cooling ◽  
Absorption Cooling System

In this work, the performance of a single effect absorption cooling system fed by solar thermal energy is evaluated. The absorption chiller includes a membrane-based microchannel desorber using three types of nanoparticles: Al2O3, CuO, or carbon nanotubes (CNT). Correlations available in the open literature to calculate the thermal conductivity of nanofluids are reviewed. Using experimental data for the water-lithium bromide solution (H2O-LiBr) with Al2O3 and CNT nanoparticles, the most appropriate correlation for thermal conductivity is selected. Nanofluid properties are evaluated using a concentration of nanoparticles of up to 5% in volume. The largest increase in the desorption rate (7.9%), with respect to using pure H2O-LiBr solution, is obtained using CNT nanoparticles and the maximum concentration of nanoparticles simulated. The performance of the chiller is evaluated and the daily solar coefficient of performance (SCOP) for the solar cooling facility is obtained. The best improvement with respect to the conventional system (without nanoparticles) represents an increase in the cooling effect of up to 6%. The maximum number of desorber modules recommended, always lower than 50, has been identified.

Daily Exergy Assessment of LiBr-Water Absorption Chiller Used for Solar Cooling

2010 ◽  
Author(s):  
Cenk Onan ◽  
Derya B. O¨zkan
Keyword(s):  
Renewable Energy ◽  
Environmental Temperature ◽  
Cooling System ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Exergy Destruction ◽  
Solar Cooling ◽  
Dead State ◽  
Absorption Cooling ◽  
Absorption Cooling System

In today’s society in which energy costs are high, the use of renewable energy sources has gained importance in cooling and heating systems. In recent years, solar cooling, which is a type of renewable energy source, is increasing rapidly in use in Europe. A solar assisted absorption cooling system was designed for acclimatizing villas in Mardin, Turkey, and the performance of the system under different temperatures was analyzed using Matlab. The cooling load of the villas was calculated assuming a cooling season of May 15 to September 15. The cooling capacity was calculated to be 106 kW. Changes in the coefficient of performance, the capacity of the hot water driven absorption cooling system and the exergy destruction values of the system according to our country’s meteorological data were calculated using Matlab. The amounts of inlet and outlet exergy were calculated separately for each component. Calculations were performed for two dead state temperatures: 25 °C and the environmental temperature, which is a more realistic approach. Therefore, the effect of varying the dead state temperature on the results was determined. It is observed that the greatest source of exergy destruction in the system was the solar collectors and the second greatest source of exergy destruction was the generator. The hourly distributions of exergy destruction values are given in a table. The effects of environmental temperature and solar insulation were stated for the optimization of energy and exergy in the combined system, which are planned to be established.

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