10-20-10_notes

# 10-20-10_notes - Energy Balances Open Systems at SS mass...

This preview shows pages 1–8. Sign up to view the full content.

1/27/11 Energy Balances: Open Systems at SS _____________ - mass crossing system boundaries Work must be done to push mass in Work done on surroundings by mass that emerges ____________________________________

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1/27/11 Flow work and Shaft work _______________ – rate of work done by the process fluid on a moving part within the system (eg. a pump rotor) ______________ – rate of work done by the fluid at the system outlet minus the rate of work done on the fluid at the system inlet
1/27/11 Flow Work _______________________________ ________________________________

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1/27/11 Specific Properties and Enthalpy Specific property- intensive quantity obtained by dividing an extensive property by the total amount of the process material Example: if there are 200 cm3 of a fluid (extensive) and 200 g is its mass (extensive) the specific volume is 1 cm3/g (intensive)
1/27/11 Specific Enthalpy Easily calculated using specific internal energy, total pressure, and specific volume Often energy balances on closed systems reduce to Q=deltaH(when there is expansion or contraction against constant pressure).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1/27/11 Steady State Open-System Energy Balance 1st law of thermo for a open system at SS: input=output(no accumulation, gen. or cons.) Input: total rate of transport of KE, PE, IE and heat Output: total rate of energy transport out and work
1/27/11 SS Open-System Energy Balance By considering all terms (potential,

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 25

10-20-10_notes - Energy Balances Open Systems at SS mass...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online