TERMINOLOGY USED IN HVAC PART-5

Some common difinition used in hvac industry-

SPECIFIC HEAT- The amount of heat necessary to change the temperature of a one pound of a substance 10F.

SPECIFIC VOLUME- The volume of a substance per unit of mass; i,e standard air 13.33 cubic feet per pound. The reciprocal of density.

STATE CONDITION- Substance can exist in three states; solid, liquid, and vapour.

STATIC PRESURE- The normal force per unit area at a small hole in the wall of a duct.

SUB COOLING- Cooling of a liquid, at a constant pressure, below the point at which it was condensed.

SUBLIMATION- A condition where a substance changes from a solid to gas without becoming a liquid.

SUCTION LINE- A tube used to convey the refrigerant vapour from the evaporator outlet to suction inlet of compressor.

ACCUMULATOR- A device located in the suction line that intercepts quantity of a liquid refrigerant and thereby prevent damage to the compressor.

SUPERHEAT- Heat added to a vapour after all liquid has been vaporized.

TEMPERATURE- A measurement of heat intensity.

THERMOSTAT- A bimetal actuated switch to closed and open a circuit to indicate or terminate operation of a heating or air conditioning system.