For a direct expansion 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 at temperatures below 0 degrees C.
d) The evaporator can be located in air circulating ducts communicating with the material or space being refrigerated.
e) Water cooled by the chiller evaporation coils is used to refrigerate at temperatures equal to 0 degrees C.
Answer: D