علم سیستمهای تهویه مطبوع. تهیه کننده: محسن اشکذری. Himech.wordpress.com. What is \'Air Conditioning\'?. Air Conditioning is the simultaneous control of Temperature, Humidity, Motion & Purity of the atmosphere in confined Space. What are the Requirements of comfort Air Conditioning?
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تهیه کننده: محسن اشکذری
1. Temperature : 24 + 2 Degree Celsius DBT. 2. RH : 50 + 10% RH.
1. Dry Bulb Temperature: The temperature of air measured by ordinary thermometer is known as Dry Bulb Temperature. 2. Wet Bulb Temperature: The temperature measured by the thermometer when its bulb is covered with Wet Cloth & exposed to airflow is known as Wet Bulb When the difference between DBT and WBT is Zero, the air becomes fully saturated (100 % RH). 3. Relative Humidity : The relative humidity is defined as the ratio of actual mass of water vapor in a given volume to the mass of water vapor if the air is saturated at the same temperature. RH = Mass of the water vapor actually present in a volume of air at T degree C. Mass of the water vapor required to saturate the same volume of air at T degree C .
1. Compressor - It is heart of the air conditioning system. Its function is to suck the refrigerant vapor from the evaporator, and to raise its temperature & pressure by compression to a point such that it can be condensed with the available atmospheric air. 2.Condenser - The function of condenser is to provide a heat transfer surface through which heat passes from hot refrigerant vapor to the atmospheric air. In condenser high temperature vapor is converted in to high temperature liquid by removal of latent heat .3.Strainer - Strainer is normally fitted in between a condenser & Capillary tube to remove moisture & foreign particles from the refrigerant. The moisture & foreign particles if allowed to enter may choke the capillary tube thereby restricting the flow of refrigerant resulting in less cooling / no cooling. 4.Capillary Tube - It is a tube with a very small orifice and its function is to meter the proper amount of refrigerant to the evaporator and reduce the temperature & pressure of liquid refrigerant entering the evaporator. Hence, this low temperature liquid will vaporize in the evaporator and take out sufficient amount of heat from room air 5.Evaporator - Its operation is similar to that of condenser. Here Liquid refrigerant is converted to low temperature vapor by taking the heat from the room air. It is at the evaporator cooling is produced and room is conditioned
In what way refrigerant helps in achieving cooling in a confined space?
Does the use of R-22 affect the ozone layer?
What is EER?
Energy Efficiency Ratio =Cooling Capacity (BTU/Hr.) /Power consumption (Watts/Hr.)
. Reciprocating Compressor . Rotary Compressor. Centrifugal compressor
What types of compressor is
normally used in Window / Split Air Conditioner?.
. Reciprocating Compressor . Rotary Compressor
What is the need for having fins in condenser and evaporator?Fins are provided to increase the heat transfer area and thereby to improve the efficiency of the unit.
What is the advantage of having grooved copper tubes?
The advantage of grooved copper tubes over ordinary tubes is that it increases the resistance to the flow of refrigerant and thereby increasing the heat transfer rate.
1. It can be installed where window AC\'s cannot be installed. 2. It can be installed in places where the aesthetics is the first priority. 3. It can be installed in places where the noise level is to be minimum.
When the compressor is started it sucks the refrigerant vapor at low temperature and low pressure from the evaporator through the suction line. After compressing, it discharges the refrigerant at high temperature and high pressure in vapor state to condenser through the discharge line. Here the vapor is condensed at high pressure by lowering down the temperature of refrigerant with the help of atmospheric air, which was circulated by condenser fan. This liquid flows towards capillary tube through the liquid line & strainer. When the liquid passes through the capillary tube, its pressure and temperature are lowered and enters into the evaporator. Here this liquid refrigerant gets vaporized by absorbing the heat from the room air, which is being sucked by the blower through the evaporator coil. Hence the room air gets cooled and the same is discharged to the room. The compressor sucks the vaporized refrigerant at low temperature and low pressure. This cycle is repeated till the compressor works.