Sources of Heat
Let us continue with various sources of heat inside the room:
2) Heat produced by the human beings: The body of the human beings is like an engine. While the engine consumes fuel and runs the vehicle, the human body consumes food and performs work. Due to burning of the fuel, lots of heat is generated inside the engine, which is released by exhaust. Inside the human body also the calories inside the food are burnt. Part of these calories are used to perform work while the remaining of calories generate heat inside the body, which has to be thrown to the atmosphere. Thus the human beings generate lots of heat inside the room and which leads to increase in temperature inside the room and creation of uncomfortable conditions. As the number of human beings inside the room increase, the total heat generated by the human beings also increases.
3) Electrical and electronic appliances: In all the rooms there are some or the other electrical and electronic appliances. There can be tube lights, coffee maker, glass water heater etc. These also play an important role in generation of heat inside the room, increase of the temperature and creation of uncomfortable conditions. The coffee make and glass water heater can also increase humidity inside the room.
Due to above various sources of heat the temperature inside the room becomes very high and the relative humidity can also be high. Further, there can also be less flow of air inside the room. All these factors lead to creation of highly uncomfortable conditions inside the room.
As per the research carried out by various HVAC engineers, it is found that the human body feels comfortable at 25 degree Celsius of temperature, 50% relative humidity and with sufficient flow of clean air.
The AC removes all the heat that is generated inside the room and maintains the temperature of 20 degree Celsius. It also removes the excess amount of moisture from the air and maintains relative humidity of 50%. The air conditioner has fan that produces necessary flow of air and the filter removes all the dust and dirt particles from the air.
In short the AC produces comfort conditions in which the human beings tend to feel highly comfortable. In these conditions the working efficiency of the human beings becomes maximum; hence they are able to work with greater vigor.