Mechanism of air condition

understand and describe the working of domestic appliances

1. MECHANISM OF AIR CONDITION

2. HISTORY Since prehistoric times, snow and ice were used for cooling. The business of harvesting ice during winter and storing for use in summer became popular towards the late 17th century.  This practice was replaced by mechanical ice-making machines.

3. HISTORY The basic concept behind air conditioning is said to have been applied in ancient Egypt, where reeds were hung in windows and were moistened with trickling water. The evaporation of water cooled the air blowing through the window. This process also made the air more humid, which can be beneficial in a dry desert climate. Other techniques in medieval Persia involved the use of cisterns and wind towers to cool buildings during the hot season.

4. HISTORY The 2nd-century Chinese mechanical engineer and inventor Ding Huan  of the Han Dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10  ft ) in diameter and manually powered by prisoners.  In the 17th century, the Dutch inventor  Cornelis Drebbel  demonstrated "Turning Summer into Winter" as an early form of modern air conditioning.

5. WORKING OF AIR CONDITIONER

6. What is Air conditioner An air conditioner is a system or a machine that treats air in a defined, usually enclosed area via a refrigeration cycle in which warm air is removed and replaced with cooler air. In construction, a complete system of heating, ventilation, and air conditioning is referred to as HVAC.

7. How does an Air conditioner works The air conditioner in a central heating and cooling system provides cool air through ductwork inside home, by providing a process that draws out the warm air inside, removing its heat. ... From that point, the condenser or outdoor unit then turns the refrigerant vapor back into a liquid, removing any heat.

8. How does an Air conditioner works The air conditioner in a central heating and cooling system provides cool air through ductwork inside home, by providing a process that draws out the warm air inside, removing its heat. ... From that point, the condenser or outdoor unit then turns the refrigerant vapor back into a liquid, removing any heat.

9. How does an Air conditioner works An air conditioner can change the temperature, humidity or general quality of the air. More specifically, an air conditioner makes home cooler, by drawing heat energy out of the house and transferring that heat to the outdoors, then replacing the air inside the home with cooler air.

10. Thank you

11. How does an Air conditioner works An air conditioner collects hot air from a given space, processes it within itself with the help of a refrigerant and a bunch of coils and then releases cool air into the same space where the hot air had originally been collected. This is essentially how all air conditioners work.

12. Classification of Air Conditioning systems Following are the types of air conditioning system: Comfort air conditioning system. Industrial air conditioning system. Winter air conditioning system. Summer air conditioning system. Year-round air conditioning system. The unitary air conditioning system Central air conditioning system.

13. Equipment Used in an Air Conditioning System Following are the main equipment or parts used in an air conditioning system: Circulation fan:  The main function of this fan is to move air to and from the room. Air conditioning unit : It is a unit, which consists of cooling and dehumidifying processes for summer air conditioning or heating and humidification processes for winter air conditioning. Supply duct : it directs the conditioned air from the circulating fan to the space to be air-conditioned at the proper point.

14. Equipment Used in an Air Conditioning System Supply outlets : these are the grills, which distribute the conditioned air evenly in the room. Return outlets:  these are the openings in a room surface which allow the room air to enter the return duct. Filters:  The main function of the filters is to remove dust, “dirt and other harmful bacteria”s form the air.

15. AIR CONDITIONER WORKING PRINCIPLE

16. AIR CONDITIONER WORKING PRINCIPLE An air conditioner continuously draws the air from an indoor space to be cooled, cools it by the refrigeration principles and discharges back into the same indoor space that needs to be cooled. This continuous cyclic process of drawl, cooling and recalculation of the cooled air keep the indoor space cool at the required lower temperature needed for comfort cooling or industrial cooling purpose. When you switch the air conditioner on, the thermostat control sends 120V of alternating current to the compressor and the fan motor.

17. AIR CONDITIONER WORKING PRINCIPLE The compressor act as a pump compressing the refrigerant in gas form into the condenser coils. Located the back of the unit. Where the gas is condensed into a hot liquid. The condenser coils dissipate the heat as the liquid travels through them. 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. it travels to the evaporator coils located near the front of the unit.

18. AIR CONDITIONER WORKING PRINCIPLE 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.

19. AIR CONDITIONER WORKING PRINCIPLE 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 event can operate the fan motor only to draw in cool air at night.

20. Thank you paluvadi mukunda Priya 18031AA058