In an indirect refrigeration system, how can we ascertain that the circulating chilled water won't freeze up.
a) by keeping the discharge pressure of compressor higher than its suction pressure
b) by making sure that the evaporator temperature does not sink below 0 degree C
c) by controlling the temperature of evaporator and condenser of the refrigerant system
d) by keeping the temperature of brine at 5 degree C
e) by controlling the regulating valve at the evaporator
Answer: D