A work done on the steady flow system is 30 kJ/kgm. Calculate the heat in HP if the mass flow rate of fluid is 10 kg per minute given that the internal energy is decreased by 10 kJ/kgm and the fluid flow is increased by 20 kJ/kgm. Also, identify if the heat is added to the system or rejected by the system.

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Hamza Conrad · Accepted Answer

Given:  W  =  30   KJ/Kg    m  =  10   Kg/min        u    1    =  10   KJ/Kg        u    2    =  20   KJ/KgBy First law of thermodynamics:  ∂  Q  =  d  u  +  ∂  W    d  U  =  m  ⋅  (      u    2    −      u    1    )  =      10    60    ⋅  (  20  −  10  )    d  U  =  1.67   KW    ∂  W  =  m  ⋅  W  ⋅      10    60    ⋅  −  30    ∂  W  =  −  5   KW    ∂  Q  =  1.67  −  5    ∂  Q  =  −  3.33   kW

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