A heat exchanger is being investigated as a waste heat recovery device. A heat exchanger is common device for using a hot fluid to heat a cold fluid without the fluids mixing.  The following information is known.  The cold fluid stream of liquid A enters at 294.2 K and leaves the device at a temperature of 320.91 K.  Liquid A flows at a rate of 0.006 Kg/s and has a specific heat of 4180 J/(Kg K).  Liquid B enters the device at a temperature of 350.2 K.  Liquid B flows at a rate of 0.005 Kg/s and has a specific heat of 3900 J/(Kg K  The dead state is at 293.2 K and 1 bar.  The device is adiabatic and the pressure losses are neglected in this problem.  Both liquids are incompressible materials. Tout=316.154K Answer the following:  If the exiting liquid B is not used for any useful purpose, calculate the exergy destroyed associated with it.

Question

A heat exchanger is being investigated as a waste heat recovery device. A heat exchanger is common device for using a hot fluid to heat a cold fluid without the fluids mixing.  The following information is known.  The cold fluid stream of liquid A enters at 294.2 K and leaves the device at a temperature of 320.91 K.  Liquid A flows at a rate of 0.006 Kg/s and has a specific heat of 4180 J/(Kg K).  Liquid B enters the device at a temperature of 350.2 K.  Liquid B flows at a rate of 0.005 Kg/s and has a specific heat of 3900 J/(Kg K  The dead state is at 293.2 K and 1 bar.  The device is adiabatic and the pressure losses are neglected in this problem.  Both liquids are incompressible materials. Tout=316.154K

Answer the following: 

If the exiting liquid B is not used for any useful purpose, calculate the exergy destroyed associated with it.

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