Open AccessDESIGN, CFD ANALYSIS AND PERFORMANCE EVALUATION OF COMBINED STEAM EJECTOR SINGLE EFFECT LIBR/H2O ABSORPTION REFRIGERATION SYSTEM
Author(s) -
Munawar Nawab Karimi,
Nawab Karimi Alabd Mohamed
Publication year - 2020
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2020.v05i08.032
Subject(s) - injector , computational fluid dynamics , nozzle , refrigeration , refrigerant , nuclear engineering , condenser (optics) , working fluid , mechanical engineering , materials science , evaporator , mechanics , environmental science , engineering , heat exchanger , physics , light source , optics
The objective of this work is to develop theefficiency of vapour absorption system by addition thesteam ejector cycle. Computational fluid dynamics (CFD)is a numerical implement that is greatly accurate tosimulate a high number of applications and developments.The CFD analysis has appeared as a viable skill to providedynamic and efficient design solutions. In this work a CFDanalysis concentrate on the mathematical simulation of theoperating of a steam ejector to develop the Efficiency ofvapour absorption cycle using LiBr/H2O as a workingrefrigerant for this system and operating under steadystate conditions. The overall design steam ejectortechnique that follows ASHRAE and ESDU recommendedare considered in this study, throat nozzle diameter of 4.13mm, and suction maxing chamber diameter of 10 mm. Theeffect of different operational settings on the performanceof the steam ejector operating in combination with a singleeffect absorption system was measured. The geometricalmodel and meshing is done with solid works and ANSYSFLUENT solver is used for the analysis. In this researchstudy, development to the system is achieved by utilizingthe potential kinetic energy of the ejector to enhancerefrigeration efficiency. The effects of the entrainmentratio of the ejector, primary and secondary operatingtemperature, on the condition condenser pressure andtemperature and system performance have been studied.The results showed that the entrainment ratio is found toincrease with the decrease of secondary pressure(evaporator pressure) and consequently, the entrainmentratio is also found to increase with increase of generatortemperature keeping the evaporator temperature andcondenser pressure constant. The entrainment ratio doesnot vary much with the condenser pressure until thecritical condenser pressure. The COP of the establishedsystem is developed by up to 45% compared with thatBasic system at the given condition.