Energy
Conservation (cont.)
We will now
also account for energy tranfer via Heat Transfer
The general
most general form of conservation of energy for a system can be written as:
dE = dQ-dW where (Ch. 3, YAC)
dE º
Change in Total Energy, E
and E =
U(internal energy)+Em(mechanical
energy) (Ch. 1 YAC)
̃E =
U + KE (kinetic energy) + PE(potential energy)
dW º Work done by the system where
W = Wext(external work) + Wflow(flow work)
dQ = Heat transfer into
the system (via conduction,
convection & radiation)
Convention: dQ > 0 net heat transfer into the system
dW > 0, positive work done by the
system
