Once the liquid refrigerant has passed through the condenser coils and the capillary tube where it undergoes expansion. The liquid refrigerant passes through the evaporator coils. As the refrigerant liquid enters these coils it expands into a gas which makes the coils cold.
The gas flows through the coils to a suction line, attached to the compressor converts the gas back into a liquid and the cooling cycle continues. At the same time, the fan motor rotates a blower wheel which draws in air to be cooled by the evaporator coils before recirculating it back into the room.
It also operates the condenser fan blade which blows outside air through the condenser coils to cool them. The air temperature is regulated by the thermostat control depending on the model. The control may be a thermostat switch and sensing bulb assembly or electronic control board that works with a sensor. The sensing bulb or electronic sensor is clipped to the front of the evaporator coils to monitor the temperature of the air entering the coils.
Once the room has sufficiently cooled the thermostat control shuts off the voltage to the compressor. Some models which use an event can operate the fan motor only to draw in cool air at night.
However, when the appliance is actively cooling the air the vent must be closed for the system to work properly. A slinger ring on the condenser fan blade picks up collected water at the bottom and sprays it on to the condenser coils to help the coils dissipate the heat.
To prevent the water from dripping into the room the appliance should be tilted back slightly when they installed. In these types of air conditioning system, the air is brought to the required dry bulb temperature and relative humidity for human health, comfort, and efficiency. In homes, offices, shops, restaurants, theatres, hospitals, schools etc. In these types of air conditioning system, the inside dry bulb temperature and relative humidity of the air is kept constant for working of the machine and for the manufacturing process.
Textile mills, Paper mills, Machine part manufacturing plants, Toolroom, Photographic, etc. Air conditioner working principle In winter air conditioning system , the air is burnt and heated, which is generally followed by humidification. The outside air flows through a damper and mixes with the recirculated air. The mixed air passes through a filter to remove the dirt, dust, and impurities.
The air now passes through a preheat coil to prevent the possible freezing of water and to control the evaporation of water in the humidities. After that, the air is made to pass through a reheat coil to bring the air to the designed dry bulb temperature. Now, the conditioned air is supplied to the conditioned space by a fan. From the conditioned space, a part of the air is exhausted to the atmosphere by the exhaust fans. The author sincerely hopes that this presenta- Air conditioning and refrigeration equipment tion, based on his more than 55 years of experience and systems are covered thoroughly.
Equipment in the field working for manufacturers, as a construction and selection are described. Included consulting engineer, and as an educator.
The HVAC industry. Pita was chief mechanical engineer for a large consult- Edward G. Capitol, and many other govern- lege of the City University of New York. He mental and private clients. Ratio 7. I Properties of Air Systems 7. I Abbreviations and Symbols Overall Heat Transfer Coefficient S Psychrometric Chart, u:. Units Sud- denly the air conditioning system in the gigantic building machine room, walked around, and looked at the complex installation capable of delivering Acme Towers office building stopped operating.
Immedi- 95 F. The building did not have operable windows ately the whole plant started functioning and soon that could be opened to relieve the oppressive heat.
Computers broke down, employees started to The building manager thanked Joe and asked leave, and tenants threatened lawsuits for damages. Finally one person said, ping a valve? F or prehistoric people, open fires were the pri- mary means of warming their dwellings; shade and cool water were probably their only relief from air cooling.
In Europe, Leonardo da Vinci designed a large evaporative cooler Figure 1. The development of effective heating, ventilat- heat. No significant improvements in humankind's ing, and air conditioning HVAC , however, was be- condition were made for millions of years. The fire- gun scarcely I 00 years ago. Central heating sys- places in the castles of medieval Europe were tems were developed in the nineteenth century, and hardly an improvement-they only heated the area summer air conditioning using mechanical refriger- immediately around them.
Paintings from those ation has grown into a major industry only in the times show that the kings and queens wore furs and last 60 years. Yet by , HVAC systems in the gloves indoors in winter! The ancient Romans had remarkably billion in equipment sales.
It is not surprising, hollow floors or walls. In the dry climate of the therefore, that providing a healthy, comfortable in- Middle East, people hung wet mats in front of open door environment has become a major factor in our doorways and achieved a crude form of evaporative economy.
Sketch the arrangement of the main compo- nents of an all-air air conditioning system. A study of this chapter will enable you to: 4. Sketch the arrangement of the main compo- I. List the environmental conditions that an air nents of a hydronic heating and cooling system. Describe the internal environmental condi- 2. Describe where air conditioning is used.
Let us investigate how each of these conditions is controlled: 1. Show related SlideShares at end. WordPress Shortcode. Next SlideShares.
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