10 Questions
What is the significance of $Q$ in the energy balance equation for a control volume?
Rate of heat transfer between the control volume and its surroundings
When is the power term $W$ zero in the energy balance equation for a control volume?
When neither power nor work is present in the system.
How can the enthalpy change of a fluid be determined in a control volume analysis?
By reading the enthalpy values at the exit and inlet states from the tables.
In the context of energy balance, what does $ abla h$ represent?
Enthalpy change of the fluid
What does it mean when a control volume is adiabatic?
No heat transfer occurs between the control volume and its surroundings.
In a boiler, which of the following statements about work is true?
Work is usually zero in boilers due to the nature of the process.
When analyzing a boiler, why are changes in potential energy often considered negligible?
Because potential energy changes are usually small compared to enthalpy changes.
What role does a condenser play in a thermodynamic system?
It acts as a heat exchanger to condense steam into liquid water.
In a condenser, what is the primary purpose of allowing cooling water to flow inside the pipes?
To reject heat from the condenser and enable steam condensation.
When analyzing a control volume involving a pump, what assumption can be made about the inlet and exit pressures?
The inlet and exit pressures of the pump are typically equal due to constant pressure heating.
Learn about throttling valves in thermodynamics which cause pressure drop without involving work, as well as the application of the 1st law of thermodynamics in such systems.
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