Question

For a direct expansion compression refrigeration system, which of the following statements is TRUE?

A) The evaporator in this system is never in direct contact with the material or space being refrigerated.
B) For large systems calcium chloride brine is cooled by the evaporator then pumped to the area being refrigerated.
C) Water cooled by the chiller evaporation coils is used to refrigerate below 0°C.
D) The evaporator can be located in air circulating ducts communicating with the material or space being refrigerated.
E) A direct expansion system is not the same type of system as the direct refrigeration system.

Answer 1

The true statement about a direct expansion compression refrigeration system is that the evaporator can be located in the air circulating ducts for direct cooling of the space or material.

Step-by-step explanation:

The correct answer to the question about a direct expansion compression refrigeration system is: D) The evaporator can be located in air circulating ducts communicating with the material or space being refrigerated. This type of refrigeration system cools the space directly rather than using a secondary chilled medium like brine or chilled water. The direct expansion system functions by allowing the refrigerant to evaporate directly in the evaporator, which is placed in the area to be cooled. Air from the space is circulated across the evaporator coils, where the refrigerant absorbs heat and changes phase from a liquid to a gas. This process effectively removes heat from the material or space, thus refrigerating it.