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5.16. The chain of heat exchangers shown in Fig. 5-27 has the purpose of elevating
W/m and
the temperature of a fluid to 390 K, at which temperature the desired chemical
the atmo-
reaction takes place. The fluid has a specific heat of 3.2 kJ/(kg . K) both
coefficient
before and after the reaction, and its flow rate is 1.5 kg/s. The entering
temperature of the fluid to heat exchanger I is 290 K and the UA of this
heat exchanger is 2.88 kW/K. Steam is supplied to heat exchanger II at 375
K, and condensate leaves at the same temperature. The UA values of heat
exchangers II and III are 4.7 and 9.6 kW/K, respectively. What are the values
of temperatures to to t4?
Ans.: tA = 365 K.
Steam 375 K
Heat
Heat exchanger II
t2
t3
290 .K
Heat exchanger III
Heat exchanger I
Condenser 375 K
390 . K
t4
Reactor

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