ControlVolume - ME 201 Thermodynamics First Law for Control...

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1 ME 201 Thermodynamics First Law for Control Volume Systems Guide Recall that for a control volume system there is no accumulation or depletion of mass so that the mass inflow must equal the mass outflow or m = m outflows out inflows in Also in a control volume system there is no boundary work. We can re-write our 1st law equation as W - Q = ) e m ( - ) e m ( sh inflows in in outflows out out where Q now represents the net heat transfer rate into the control volume system (so it is positive for energy added by heat transfer and negative for energy removed by heat transfer) and W sh represents the net shaft power out of the control volume system (so it is positive for energy removed by shaft work and negative for energy added by shaft work). Some guidelines for solving control volume system energy problems are: No Boundary Work Use enthalpy, h, NOT internal energy, u Either Q =0 or W sh = 0 Results will either be shaft power/heat transfer rate or specific work/specific heat transfer
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ControlVolume - ME 201 Thermodynamics First Law for Control...

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