A stream of ethylene glycol vapor at its normal boiling point and 1 atm flowing at a rate of 175 kg/mm is to be condensed at constant pressure. The product stream from the condenser is liquid glycol at the condensation temperature.

(a) Using data in Table B.1, calculate the rate (kW) at which heat must be transferred from the condenser.

(b) If heat were transferred at a lower rate than that calculated in part (a), what would the state of the product stream be? (Deduce as much as you can about the phase and the temperature of the stream.)

(c) If heat were transferred at a higher rate than that calculated in part (a), what could you deduce about the state of the product stream? Sketch a phase diagram (see Figure 6.1-1 on p. 241) and use it to explain your answer.