A stream of liquid ethylene glycol is to be heated from 30° to 80°, using saturated steam at 250°. The saturated steam enters the heat exchanger counter-currently and the heat loss can be neglected. If the flow rate of the ethylene glycol is 150m, and the steam condenses and leaves the heat exchanger as liquid water at 90°.
a) Calculate the required flow rate of the entering steam in m.
b) Calculate the rate of heat transfer from the water to the ethylene glycol (kW).