Enesfer anrgy, Energy Trand General Energy Analysis
EGR 240 Chapter 2, Energy, Energy Transfer and General Energy Analysis 1
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The various forms of microscopic energies that make up sensible energy
Thermal = Sensible + Latent
internal = Sensible + latent + chemical + Nuclear
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Figure 2 -5
Mass and energy flow rates associated with the flow of steam in a pipe of inner diameter D with an average velocity of
Mass flow rate:
Energy flow rate:
Mechanical energy: The form of energy that can be converted to mechanical work completely and directly by an ideal mechanical device such as an ideal turbine
Kinetic and potential energy: The form of mechanical energy.
mechanical energy of a flowing fluid per unit mass
rate of mechanical energy of a flowing fluid
Mechanical energy change of a fluid during incompressible flow per unit mass
Rate of mechanical energy change of a fluid during incompressible flow
Mechanical energy is illustrated by an ideal hydraulic turbine coupled with an ideal generator.
In the absence of irreversible losses, the maximum produced power is proportional to (a) the change in water surface elevated from the upstream to the downstream reservoir or (b) (close-up view) the drop in water pressure from just upstream to just downstream of the turbine
(with associated energy content)
Control volume can be changed to mass flow as well as heat and work interactions
(in most fluid dynamics book volume flow rate is annotated as q or Q)
We will use q and Q for heat transfer