International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
CFD Analysis of VARS Component (Evaporator) on ANSYS Fluent Ajay Pawar , Ajay Ekka , Anmol Pagaria Arjun Parmar , Bhupesh Chouhan AJAY PAWAR MECHANICAL ENGINEER MITM,INDORE ANMOL PAGARIA MECHANICAL ENGINEER MITM,INDORE GUIDED BY :- Mr. RAVI VERMA PROFESSOR , MITM , INDORE ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This work presents design and analysis of an
ammonia water absorption refrigeration system using exhaust of an internal combustion engine as energy source. It belongs to vapor absorption refrigeration system capacity 1 tonne which will replace the conventional car's AC system. The design is based on basic concepts of thermodynamic principles. In design of evaporator of system is calculated on the basis of enthalpy parameters at different points in the system. The data is analyzed using the first and second laws of thermodynamic. After designing of the system modeling is done by using cad software solid edge and analysis is done by using ansys fluent. The system is working between the condenser pressure of 10.7 bar and evaporator pressure of 4.7 bar. Ammonia is used as the refrigerant in the system and water as absorbent in the physic-chemical process. Key Words: Evaporator, solid edge, fea , cfd analysis, ansys fluent.
1.INTRODUCTION Energy efficiency has been a major topic f discussion on natural resource preservation and costs reduction. Based on estimates of energy resources at medium and long terms it is vital to develop more efficient processes from energy and exergy standpoints. Environment preservation must also be considered through energy optimization studies. An important point to mention chlornized fluorocarbons (CFC’s) by alternative refrigerants, according to the Montreal protocol, signed in 1987 by 46 countries and revised in 1990 to protect the ozone layer. Other motivating factors are the continues optimization of the performance of internal combustion engine and increasing utilization of air conditioning in vehicles, as it reaches the status of essential need for modern life. Internal combustion engines are potential energy sources for absorption refrigerant systems, are potential energy sources for absorption refrigeration systems, as about one third of Š 2017, IRJET
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the energy availability in the combustion process is wasted through the exhoust gas. Thus use of exhaust gas in an absorption refrigeration system can increas the overall system efficiency. The technology of absorption refrigeration has been used for cooling purposes for over a hundred years now. Even after the advent of various compact refrigerators they still continue to attract scientists and engineering enthusiasts as they provide means of regenerating the waste heat from plants, automobile, etc. into useful work. Ammonia vapour is vigorously absorbed into water. So when low pressure ammonia vapour from the evaporator comes in the contact in the absorber with the weak solution coming from generator; it is readily absorbed, releasing the latent heat of of condensation. The water has tye property to absorb very large quantities of ammonia vapour and the solution thus formed, is known as aqua-ammonia. The main difference between an compression and a absorption cycle is that the former needs mechanical energy as a driving source for the compressor and the latter needs thermal energy for the desorber and only a small amount (2% of the driving energy) of electricity for the liquid pump. In some cases it is useful to build Absorption Refrigeration Plants (ARP) with several stages, foe instance when the temperature of driving energy is not high enough. The absorption of ammonia in water lowers the pressure in the absorber which in turn draws more ammonia vapour from the evaporator and thus raises the temperature of solution. The absorber is cooled by the circulating water thus absorbing the heat of solution (Qa) and maintaining a constant temperature. The strong solution ( rich in ammonia) thus formed in the absorber is pumped to the generator by the liquid pump. The pump increases the pressure of strong solution. ISO 9001:2008 Certified Journal
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