question archive Spent steam is exhausted at a rate of s m? = 2,350 kg/hr from an industrial process at Ts,in = 110°C and Ps = 1 atm is currently condensed and cooled to Ts,out = 40°C at constant pressure by heat transfer to cooling water in a heat exchanger
Spent steam is exhausted at a rate of s m? = 2,350 kg/hr from an industrial process at Ts,in = 110°C and Ps = 1 atm is currently condensed and cooled to Ts,out = 40°C at constant pressure by heat transfer to cooling water in a heat exchanger
Subject:Mechanical EngineeringPrice: Bought3
Spent steam is exhausted at a rate of s m? = 2,350 kg/hr from an industrial process at Ts,in = 110°C and Ps = 1 atm is currently condensed and cooled to Ts,out = 40°C at constant pressure by heat transfer to cooling water in a heat exchanger. The cooling water enters the heat exchanger at Tcw,in = 12°C and Pcw = 1 atm and exits at Tcw,out = 18°C and the same pressure. An engineer in the plant has recognized that this heat exchange process is wasteful and he has proposed an alternative process in which power is generated. He claims that in this alternative process, the temperature and pressures of both streams remain exactly the same as they were in the original process.
Show all work with units in each step not just in answer.
a. What is the rate at which exergy is destroyed in the existing process?
b. Do you believe that this alternative process is possible? If so, determine the maximum
possible rate that power could be produced.
