Note: Problems 3 and 4 deal with the following simplified pressure heat diagram for R-134a refrigerant. The straight lin

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Note: Problems 3 and 4 deal with the following
simplified pressure heat diagram for R-134a
refrigerant.
The straight lines on the graph represent what happens to the
refrigerant during one cycle of the refrigeration cycle. At the
lower right corner, refrigerant vapor enters the compressor. The
pressure of the gas is increased, and its temperature (or total
heat) is also increased. The hot gas exits the compressor and goes
to the cooling (condenser) coils. Passing through the cooling coils
allows the gas to give up some of its heat. In doing that, the
refrigerant begins to condense. More and more of the gas condenses
until we have a pure liquid, as shown in the upper left part of the
graph. This liquid then passes through an expansion valve where the
pressure on the liquid is decreased. Some of the liquid boils and
becomes vapor. The liquid-vapor mixture moves to the evaporator
where the liquid boils, becoming all vapor. In this last step, the
heat to boil the liquid comes from the area that is to be cooled.
We now have all the vapor that enters the compressor ready to start
the process again.
How much heat does the full 8 ounces remove from the
refrigerator area as it boils back to a vapor?