You don’t have to be an air-conditioning expert to use Bilkar Coolers, but understanding the basics of air conditioning will help you understand how Bilkar Coolers work.
This section highlights some of the basic principles of air conditioning for those who would benefit from additional knowledge in this area.
PRINCIPLES OF COOLING
Heat Transfer
Heat is a form of energy. Every object on earth has some heat energy. The less heat an object has, the colder we say it is. Cooling is the process of transferring heat from one object to another. When an air-conditioning system cools, it is actually removing heat and transferring it somewhere else. This can be demonstrated by turning on a Spot Cooler and placing one hand in front of the cold air nozzle and the other over the warm air exhaust. You will feel the action of the transfer of heat.
SENSIBLE AND LATENT HEAT
There are two forms of heat energy: sensible heat and latent heat.
Sensible heat is the form of heat energy which is most commonly understood because it is sensed by touch or measured directly with a thermometer. When weather reporters say it will be 90 degrees, they are referring to sensible heat.
Latent heat cannot be sensed by touch or measured with a thermometer. Latent heat causes an object to change its properties. For example, when enough latent heat is removed from water vapor (steam or humidity), it condenses into water (liquid).
If enough latent heat is removed from water (liquid), it will eventually freeze. This process is reversed when latent heat is added.
CHANGE OF STATE
An object that changes from a solid to a liquid or liquid to vapor is referred to as a change of state. When an object changes state, it transfers heat rapidly.
HUMIDITY
Moisture in the air is called humidity. The ability of air to hold moisture directly relates to its temperature.
The warmer air is, the more moisture it is capable of holding. Relative humidity is the percentage of moisture in the air compared to the amount of moisture it can hold. A moisture content of 70°F air with 50% relative humidity is lower than 80°F air with 50% relative humidity.
When the humidity is low, sweat evaporates from your body more quickly. This allows you to cool off faster. High humidity conditions do not allow sweat to evaporate as well because the air is at its maximum capacity.
Humidity is also a form of latent heat. When air contains more humidity, it has more latent heat.
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