Figure 6-12.Condensation of moisture on a glass of cold
Figure 6-10.Normal surface evaporation.
Figure 6-11.Evaporation by pressure reduction.
Q3. What is the difference between "sensible heat"
and "latent heat"?
Figure 6-13.Pressure causes a vapor to condense.
What is the atmospheric pressure at 4,686 feet?
Mechanical refrigeration systems are an
arrangement of components in a system that puts the
theory of gases into practice to provide artificial
cooling. To do this, you must provide the following:
(1) a metered supply of relatively cool liquid under
pressure; (2) a device in the space to be cooled that
operates at reduced pressure so that when the cool,
pressurized liquid enters, it will expand, evaporate,
and take heat from the space to be cooled; (3) a means
of repressurizing (compressing) the vapor; and (4) a
means of condensing it back into a liquid, removing its
Q5. Exertion of pressure on a substance with a
constant pressure does what to the substance?
Q4. Removal of heat from a vapor causes what
change to occur?
Learning Objective: Identify and understand different
types of refrigeration system components and their