AUTOMOTIVE AIR-CONDITIONING AND CLIMATE CONTROL SYSTEMS This page intentionally left blank Automotive Air-condition. Conditioning And Climate Control Systems [PDF] [EPUB] Victor Campos. Control Systems - Thu, 11 Apr GMT Automobile air conditioning - . Automotive Air Conditioning And Climate Control Systems Steven Daly.
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Automotive Air-conditioning and Climate Control Systems is a complete text and reference on the theoretical, practical and legislative aspects. Course Toyota Air Conditioning and Climate Control. Introduction .. Pressurized gases are present in vehicle air-conditioning systems, recovery/ recycling. 1 Air-conditioning fundamentals. 1. History of automotive air-conditioning Systems. 1. Introduction to heating and Ventilation. 6. The basic theory of .
Therefore, alternative refrigerants are needed as a replacement for Ra. In this paper, the performance of an automotive air conditioning system using Ra and one using Ra are compared experimentally at the bench level.
The experimental apparatus simulated a real automotive air conditioning system consisting of a cabin and engine room structure.
The cooling capacity, condensing capacity, coefficient of performance COP and power consumption characteristics of the automotive air conditioning system are evaluated by changing the air velocity entering the condenser and the compressor rotation speed with the optimized refrigerant charge amount. Also, the performance of the Ra system was investigated by changing the thermostatic expansion valve which is set of values.
The results of this study show that the Ra system is slightly better than the Ra system, not only under driving conditions but also under idling condition.
Ra refrigerant thus shows promise as an alternative refrigerant to replace the current standard, Ra, in automotive air conditioning systems. Preview Unable to display preview. Download preview PDF. The refrigerant absorbs far more heat raise its temperature.
Similarly, when a gas than it would if it remained a liquid. In the condenser, the reverse takes place. Here, hot refrigerant gas gives off large amounts of heat to the atmosphere as it condenses back to liquid.
The refrigerant gives up far more heat than it would if it Latent Heat energy causes only remained a gas. To explain why this is so, we the change of state from solid to need to look at two kinds of heat energy: liquid or liquid to gas.
Adding heat energy to raise the temperature of a material increases Sensible Large amounts of heat energy are Heat.
For example, if we heat a pot of water absorbed or released when a on a stove, the temperature of the water will material changes state. However, there is another kind of heat energy.
At sea level pressure, water boils at F. In order to raise the temperature of one pound Evaporator of water at F by one degree to F, only one BTU heat energy is needed. But to change that same one pound of water at F to one pound of steam gas at F requires BTUs, a much greater quantity of heat. When the water condenses back to a liquid, it gives off the same BTUs of heat. As the refrigerant changes from liquid to gas and back again it absorbs and releases large amounts of latent heat energy with each change.
Heating and Air Conditioning Basics 3. The temperature of the refrigerant varies with pressure.
It was operated by a single switch on the dashboard marked with low, medium, and high positions. As the highest capacity unit available at that time, the system was capable of quickly cooling the passenger compartment and also reducing humidity, dust, pollen, and tobacco smoke.
The system drew in more outside air than contemporary systems; thus, reducing the staleness associated with automotive air conditioning at the time. Instead of plastic tubes mounted on the rear window package shelf as on GM cars, small ducts directed cool air toward the ceiling of the car where it filtered down around the passengers instead of blowing directly on them, a feature that modern cars have lost.
General Motors made a front-mounted air conditioning system optional in on Pontiacs with a straight-eight engine that added separate controls and air distribution. The alternative layout pioneered by Nash "became established practice and continues to form the basis of the modern and more sophisticated automatic climate control systems.
Although air conditioners use significant power, the drag of a car with closed windows is less than if the windows are open to cool the occupants.