Refrigeration: operator 5th
class Study Guide.
mass formula - Answer Mass = Volume x 1000 x Density ( specific gravity)
Sensible Heat - Answer heat that causes a change in temperature
The heat absorbed or transmitted by a substance during a change of temperature which is not
accompanied by a change of state.
Latent Heat - Answer heat absorbed or radiated during a change of phase at a constant
temperature and pressure
The heat given off or absorbed when a material melts or freezes, or boils or condenses. For
example, when ice is heated, once the temperature reaches +32 F (0 C), it's temperature won't
increase until all the ice is melted. The ice has to absorb heat in order to melt. But even though
it's absorbing heat, it's temperature stays the same until all the ice has melted. The heat
required to melt the ice is called the latent heat. The water will give off the same amount of
latent heat when you freeze it.
Refrigeration - Answer The function of a refrigeration system is to remove heat from a place
where it is not wanted (conditioned space) and reject it into another place where the heat is
unobjectionable (outside the conditioned space). Refrigeration systems are closed systems; that
is, they are sealed from the atmosphere
5 Main Components of Refrigeration system - Answer Compressor Condenser Receiver
Expansion Valve Evaporator
Compressor - Answer Pump of a refrigeration system which draws a low pressure on the
cooling side of a refrigerant cycle and squeezes or compresses the gas into the high pressure or
condensing side of the cycle.
Primary purpose of compressor - Answer Create a 2 pressure system High pressure and low
pressure
secondary purpose of a compressor - Answer to transport the liquid or gas refrigerant
Condenser - Answer The part of the refrigeration system which receives hot,
high pressure refrigerant gas from the compressor and cools it until it returns to a liquid state
class Study Guide.
mass formula - Answer Mass = Volume x 1000 x Density ( specific gravity)
Sensible Heat - Answer heat that causes a change in temperature
The heat absorbed or transmitted by a substance during a change of temperature which is not
accompanied by a change of state.
Latent Heat - Answer heat absorbed or radiated during a change of phase at a constant
temperature and pressure
The heat given off or absorbed when a material melts or freezes, or boils or condenses. For
example, when ice is heated, once the temperature reaches +32 F (0 C), it's temperature won't
increase until all the ice is melted. The ice has to absorb heat in order to melt. But even though
it's absorbing heat, it's temperature stays the same until all the ice has melted. The heat
required to melt the ice is called the latent heat. The water will give off the same amount of
latent heat when you freeze it.
Refrigeration - Answer The function of a refrigeration system is to remove heat from a place
where it is not wanted (conditioned space) and reject it into another place where the heat is
unobjectionable (outside the conditioned space). Refrigeration systems are closed systems; that
is, they are sealed from the atmosphere
5 Main Components of Refrigeration system - Answer Compressor Condenser Receiver
Expansion Valve Evaporator
Compressor - Answer Pump of a refrigeration system which draws a low pressure on the
cooling side of a refrigerant cycle and squeezes or compresses the gas into the high pressure or
condensing side of the cycle.
Primary purpose of compressor - Answer Create a 2 pressure system High pressure and low
pressure
secondary purpose of a compressor - Answer to transport the liquid or gas refrigerant
Condenser - Answer The part of the refrigeration system which receives hot,
high pressure refrigerant gas from the compressor and cools it until it returns to a liquid state
