Automotive Air Conditioning is the process of removing the heat and moisture from the interior of an occupied space to improve comfort of occupants. A condenser is a device or unit used to condense refrigerant from its gaseous to its liquid state, by cooling it. In so doing, the latent heat is given up by the substance and transferred to the surrounding environment. A Condenser can be made according to numerous designs, and come in many sizes. It is made of Aluminum Alloy Material and subjected to very high internal stresses due to refrigerant pressure, thermal / inertia and dynamic load. In order to evaluate the structural integrity of the condenser assembly under these loading conditions, operating frequency should be far away from the resonance frequency and component design should be robust to sustain external excitation load coming from the engine & road.The above design evaluation criteria is applicable for piston of ACâs reciprocating compressor. AC Compressorâs piston made up of Aluminum Alloy Material and subjected to very high coupled structural-thermal stresses. In order to evaluate the structural integrity of the piston under these loading conditions, operating frequency also need to far away from the resonance frequency and component design should be robust to sustain that much cyclic pressure load.The present paper describes two case studies for verification of numerical results with experimental results.Case Study: 1, shows the prediction of natural frequencies of the condenser assembly via numerical method and experimental method under free-free condition. The experimental method has been carried using Impact Hammer Testing. To get the numerical results close to the experimental results, parametric study has been carried out by varying the tubeâs shell thickness. After freezing the parameters, verified the same methodology on similar model condenser. The comparison study is carried out on the modal frequencies of condenser assembly through experimental and numerical methods. The comparison results exhibit a good trend and correlation, thus helping to develop a procedure to consider the tube fin thickness âfirst time rightâ at the simulation stage.Case Study: 2, investigate and analyze the stress distribution on piston under actual running condition. Pressure analysis and thermo-mechanical analysis is done. The parameter used for the analysis is operating gas pressure, temperature and material properties of piston. The analysis predicts the natural frequencies, von-Mises stresses and resultant displacement via numerical method. Then validates the same with Universal Testing Machine. The comparison study is then carried out with factor of safety on the model through experimental and numerical methods. The comparison results exhibit a good trend and correlation. Thereafter, established the proficiency to mitigates the development cycle time, proto making & proto testing costs on similar models.
Modeling and Simulation of Automotive AC Components (Condenser & Piston) with Experimental Validation
2019
Aufsatz (Konferenz)
Englisch
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