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The equation "energy in = energy out" is a simple way of stating the principle of the( )
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As to Freon refrigeration system, when the heat load begins to increase, the needle valve of an expansion valve will( )
If there is no change of temperature but a change of state ( solid to liquid, liquid to gas, or viceversa) it is called( ) heat.
The basic( )cycle makes use of the boiling and condensing of a working fluid at differenttemperatures and, therefore, at different pressures.
A liquid boils and condenses-the change between the liquid and gaseous states -- at a temperature which depends on its( ), within the limits of its freezing point and critical temperature.
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