The heat required to change the state of a substance without changing its temperature is called its latent heat, or hidden heat. Theoretically, any substance…
Author: admin
Every substance theoretically contains an amount of heat equal to the heat energy required to raise its temperature from absolute zero to its temperature at…
Every substance has a characteristic called specific heat. This is the measure of the temperature change in a substance when a given amount of heat…
The production of excess heat in a system will cause problems. Normally, matter expands when heated. This is the principle of thermal expansion. The linear…
The layer of air that surrounds the earth is several miles deep. The weight of the air above exerts pressure in all directions. This pressure…
Pressure-indicating devices are most important in the refrigeration field. It is necessary to know the pressures in certain parts of a system to locate trouble…
The routine of operation to secure the best and most efficient results with an attic fan is important. Atypical operating routine might require that, in…
Because of the low static pressures involved (usually less than 1/8 in. of water), disk or propeller fans are generally used instead of the blower…
Fans may be centrally located in an attic or other suitable space (such as a hallway), and arranged to move air proportionately from several rooms.…
The numerous applications of fans in the field of air-conditioning and ventilation are well known, particularly to engineers and air-conditioning repair and maintenance personnel. The…