Abstract
This paper presents experimental results on the study of the effects of ejector adiabatic absorber on heat and mass transfer of binary nanofluid with heat transfer additives (2-ethyl-1-hexanol and gum Arabic). In this case, H2O/lithium bromide-alumina nanofluid was suggested due to a growing interest in absorption heat transfer working fluid for solar energy application. An experimental setup — ejector test rig — was designed to study the absorption, heat, and mass transfer rate as a result of refrigerant vapour mass flow entrained by the ejector adiabatic absorber. The study was carried out at different solution mass flowrate (0.051 to 0.17 kg/s) with three prepared sample solutions, which include pure LiBr solution, LiBr-Alumina nanofluid without heat transfer additives, and LiBr-Alumina nanofluid with heat transfer additives. The absorption rate, mass transfer coefficient, heat transfer rate, and heat transfer coefficient for the three samples were reported. On the other hand, the percentage enhancements for all the parameters — at a suitable flow rate of 0.085 kg/s — due to the addition of alumina without and with heat transfer additives were recorded. The absorption rate enhancements were 25% and 96%, the enhancement rates of mass transfer coefficient recorded were 20% and 82%, the heat transfer rate enhancements were 85% and 183%, and the heat transfer coefficient enhancements obtained were 72% and 156% with addition of alumina nanoparticles only and alumina nanoparticles with heat transfer additives respectively. Material mass balance analysis suggests that mass inflow in the ejector equals to the mass outflow from the ejector, indicating a complete absorption of the entrained refrigerant vapour beyond which falling film absorption can occur due to concentration. This article also presents experimental evidence of the capability of ejector as strong adiabatic absorber, heat, and mass transfer component, which were earlier reported using numerical models.
Highlights
Ecological devices, which control temperature, are essential and important for the environment and our own society [1,2,3,4,5,6]
The frequent use of such particular fluids with absorption cycles are the solutions of LiBr and NH3. H2O/LiBr pair is used in air conditioning of room or space cooling
The findings had revealed a remarkable improvement of 30–85% enhancement of the coefficient of performance (COP) at evaporator temperature between 273 and 283 K, and 8–60% between 298 and 318 K temperatures of the condenser for same operating conditions obtained by a basic cycle
Summary
Ecological devices, which control temperature, are essential and important for the environment and our own society [1,2,3,4,5,6]. The findings had revealed a remarkable improvement of 30–85% enhancement of the coefficient of performance (COP) at evaporator temperature between 273 and 283 K, and 8–60% between 298 and 318 K temperatures of the condenser for same operating conditions obtained by a basic cycle This is yet another rumination of the capabilities of the component working with H2O/LiBr. Several experimental investigations have been carried out recently on thermal performance of heat transfer system using nanofluid as the working fluid. Incorporating the working fluid pair with heat transfer additives such as 2-ethyl-1-hexanol (2E1H) and gum Arabic (GA) could improve its absorption, heat, and mass transfer rates according to Lee et al [22] This is the first experimental study of a custom-made ejector adiabatic absorber with similar working fluid. This integrated setup of H2O/LiBr-Alumina nanofluid with ejector adiabatic absorber is intended for possible application in solar energy system with the scope of further reduction in maintenance cost, complexity of solar trigeneration system, and system efficiency improvement
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