TERMINOLOGY USED IN HVAC PART-3

Some common difinition used in hvac industry-

FLASH GAS- Instantenious evaporation of some liquid refrigerant ar the metering divice temperature difference, the area exposed and the type of material.

HEAT OF COMPRESSION- The heat added to a vapour by the work done during the compression.

FREEZING POINT- The tempereture at which the removal of any heat will beging a change of state from a liquid to a solid.

GAUGE PRESSURE- Pressure measured with atmospheric pressure as a base.

HEAT- A form of energy causing the agitation of molicule within a substance.

HEAT EXCHANGER- A device for the transfer of heat energy from the source to the conveying medium.

HEAT FLOW- Heat flow from a warmer to a cooler substance. The rate depemds upon the refrigerant, Its expressed in BTU's.

HEAT TRANSFER- There are three method of heat transfer are conduction, convection , radiation.

LATENT HEAT- Heat that produces a change of state without a changing a temperature; i.e., ice to water at 32° F or water to steam at 212° F. 

LATENT HEAT OF CONDENSATION- The amount of heat energy in BTU's that must be remove to change the state of one pound of vapou  to one pound of a liquid at the same temperature.

LATENT HEAT OF FUSSION- The amount of heat energy, in BTU's required to change the state of one pound of a liquid to one pound of solid at the same temperature.

LATENT HEAT OF MELTING- The amount of heat energy, in BTU's that must be remove to change to change the state of one pound of solid to one pound of vapour at the same temperature.

LATENT HEAT OF VAPOURIZATION- The amount of heat energy, in BTU's required to change the state of one pound of a liquid to one pound of vapour at the same temperature.

LIQUID LINE- A tube used to convey the the liquid refrigerant from the condensor outlet to the refrigerant control device of the evaporator.

MANOMETER- A tube filled with a liquid used to measure pressures.

MBH- One MBH is eqivalent to 1000 BTU's per hour.

MELTING POINT- The temperature at which the addition of any heat will being a change of state from a solid to liquid.

MUFFLER- Device installed in hot gas line to silence discharge surges.

OIL SEPARATOR- A device for separating out oil entrained in the discharge gas from the compressor and returning it to the crankcase.