23 ISSN 2348-7852 (Print) | ISSN 2348-7860 (Online) ijre.org IJRE | Vol. 03 No. 08 | August 2016 Design of ROVAC Air-Conditioning System for a Car Author(s): Dr G. Naga Malleswara Rao 1 ,Mr K Kiran Kumar Rao 2 , Dr SM Jameel Basha 3 , Dr S Sudhakar Babu 4 1 Professor of Mech Engg., 2 Associate Professor, Gates Institute of Technology, Gooty, AP., India 3 Professor, Sri Ramanujan Institute of Technology, Anantapuramu, India 4 Professor, Geethanjali Institute of Technolgy, Kurnool, India Abstract — This study investigates the air compression air conditioning system which utilizes a rotary vane compressor that replaces the conventional mechanical compressor in automotives. The awareness for pollution, transportation contributing the major part has lead to measures taken by the Nation, demanding reduction of global warming refrigerants used in mobile air conditioning systems. Much of effort was to refurbish the system to safe operating condition and to evaluate its performance. The result of this study provides the basis for design of improved refrigeration systems for automotives and space conditioning applications. The queer system which is based on the works of Dr. Thomas C. Edwards, has been developed in which an oval shaped housing acts as a compressor and natural substance like air as refrigerant which offers a number of environmental and practical advantages. Key words: Air Conditioning, Automobile, Brayton reversed cycle, Ram Compression, Rotary Vane Compressor INTRODUCTION Comfort cooling of automobile with refrigeration equipment is one of the most popular accessory features. The industry has passed through several basic stages of development and has investigated many more that were found to be impractical from the stand of bad applications, poor performance or high cost. Like most air conditioning systems, the auto air conditioner must provide adequate comfort cooling to the passengers in the conditioned space under a wide variety of ambient conditions. The cooling level is affected by many factors as: 1. Outdoor temperature and humidity 2. Air leakage into the conditioned space 3. The number of occupants 4. Quantity of fresh air taken in 5. Sun load WORKING OF AN AUTOMOTIVE AIR CONDITIONERS Figure.1 represents an installation of mobile air conditioner. The compressor is driven with the help of a belt from the crankshaft pulley. Further, there is a magnetic clutch, which disconnects the compressor, when there is sufficient cooling inside the passenger compartment. When control settings call for cooling, the magnetic clutch gets engaged and the compressor is driven. The refrigerant starts circulating through the system. The hot vaporized refrigerant from the compressor enters the condenser where it is cooled by a fast moving air stream and then changes into liquid. Now the liquid refrigerant enters the receiver drier and then into the evaporator through an expansion valve. Thus the low-pressure liquid refrigerant extracts heat at the evaporator and becomes vapour. The vapour refrigerant passes to the compressor, the cycle gets repeated. [1] Fig 1: Working of mobile air-conditioner Types of Automotive Air Conditioners: 1. Receiver drier (Filter drier) expansion valve system. 2. Accumulator orifice tube system 3. Suction throttling valve system The system utilizes mechanical compressor and CFC refrigerants which consume engine power and are harmful to the environment respectively. NEED OF AN ADVANCED AIR CONDITIONING SYSTEM In recent history, effects of global warming and ozone depletion from mobile air conditioning systems have been brought to the main stream news. As a result governments around the world have united to create policies, such as the Montreal protocol (1987) and its amendments, which have forced refrigeration industries to replace harmful ozone depleting CFC‟s with newly developed refrigerants. An automobile without air conditioning system gives more mileage than the vehicle with air conditioning system, because the mechanical compressor consumes more power developed by the engine itself. This drawback also knocks the door steps of Researchers to minimize the fuel consumption and simultaneously to protect the Planet from harmful emissions. [2] PROPOSED SYSTEM – ROVAC AIR CONDITIONING SYSTEM (ROVAC – Rotary Vane Air Compression Air Conditioning) This system of air conditioning the car uses nothing but air as the refrigeration and is yet to be commercially developed in automobiles. The system has been designed by Dr.Thomas C. Edwards.[3] The figure.2 shows a schematic layout of ROVAC system. It alternately compresses and expands the air. ROVAC uses no phase change like the conventional sealed units, except for the incidental moisture normally present in air. Edwards called this a reversed Brayton cycle. [4] brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by International Journal of Research and Engineering