Investigating the effect of using nanofluids on the performance of a double-effect absorption refrigeration cycle combined with a solar collector

Abstract

In this article, the performance of a double-effect LiBr-H2O absorption refrigeration cycle is studied and is improved by applying solar energy and utilizing nanofluids. A trough collector is used to preheat the working fluid before entering the generator of the cycle. In addition, four different nanofluids are considered as the heat transfer fluid of the collector: Al2O3, Ag, Cu, and CuO. The effects of using nanofluids on the outlet temperature of the heat transfer fluid, the temperature of the working fluid entering the generator, the heat produced by the generator, and COP of the cycle are studied. Different concentrations of the nanoparticles from 0 to 2.5% are considered for the nanofluids. The results indicate that in all the concentrations, Ag nanoparticles will have a better performance comparing to the other types. Furthermore, it was concluded that the higher concentrations of the nanoparticles and along with it the higher inlet temperature of the generator will decrease the generator heat production rate up to 4%. Moreover, considering the constant cooling capacity of the cycle, usage of the Ag nanoparticles in the concentration of 2.5% increases the value of COP up to 3.9%, with respect to the pure water.

Techno‐economic assessment of novel and conventional working fluid mixtures for two‐stage double‐ and triple‐effect absorption refrigeration systems

“…The (d/f ) 1 and N stage l lε{1, 2} design space has been chosen so that the supplied heat input energy Q GEN, 1 may produce an adequate amount of refrigerant purity at the generator outlet, satisfying simultaneously constraints (15) and (16). With respect to the mass flow rates _ m ref ,l and _ m abs,l lε 1, 2 f g ð Þ, the range of the considered values has been determined based on the requirement for a large-scale refrigeration system with a cooling load that may range between 1700 and 2300 RT.…”

“…13 They are also of interest in large scale applications including refineries and textile industries, 14 as well as industrial and governmental building complexes, 14,15 to name but a few. In recent years, double-effect ABR cycles are being considered in systems that use nanoparticles to enhance heat transfer within H 2 O/LiBr mixtures, 16 considering different flowsheet layouts (eg, parallel or series arrangements) with H 2 O/LiBr 17 or H 2 O/LiBr-based fluids. 18 Similarly, triple-effect ABR cycles are being evaluated in terms of exergetic and energetic performance using H 2 O/LiBr, 19 as part of solar-based infrastructures that also combine organic Rankine and Kalina cycles using NH 3 /H 2 O, 20 and as part of compression-absorption configurations that also employ ionic liquids and fuel cells.…”

Techno-Economic Analysis and New Design of a Photovoltaic Power Plant by a Direct Radiation Amplification System

“…Many analyses have been performed in the field of thermal optimization of energy production systems with photovoltaic panels. These analyses include energy exergy analysis of heat collectors and photovoltaic panels, which increase the production capacity as well as the exergy efficiency [21][22][23][24].…”

Nanofluid flow and shear layers between two parallel plates: a simulation approach

“…Using nanoparticles in fluid flows for enhancement of heat transfer has been proposed by many researchers in recent years. Due to higher thermal conductivity (Abadi et al, 2020;Ahmadi et al, 2020;Alotaibi et al, 2020;Aramesh et al, 2020;Loni et al, 2018;Maddah et al, 2018;Sadeghzadeh et al, 2020), nanoparticles are able to manipulate the thermo-physical properties of the base fluid and eventually present a new fluid called nanofluid with the capability of higher rate of heat transfer (Aghayari et al, 2020;Aybar et al, 2015;Ghalandari et al, 2019;Ghodsinezhad et al, 2016;Sharma et al, 2020;Tayebi et al, 2019;Tshimanga et al, 2016;Williams et al, 2008).…”