10-20-10_notes

10-20-10_notes - Energy Balances: Open Systems at SS _-...

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

View Full Document Right Arrow Icon
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 ____________________________________
Background image of page 1

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

View Full DocumentRight Arrow Icon
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
Background image of page 2
1/27/11 Flow Work _______________________________ ________________________________
Background image of page 3

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

View Full DocumentRight Arrow Icon
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)
Background image of page 4
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).
Background image of page 5

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

View Full DocumentRight Arrow Icon
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
Background image of page 6
1/27/11 SS Open-System Energy Balance By considering all terms (potential,
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

10-20-10_notes - Energy Balances: Open Systems at SS _-...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online