HW04_solns[1]

HW04_solns[1] - pressure processes. 2, 3: San Francisco...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
San Francisco State University ENGR 303: Engineering Thermodynamics School of Engineering Prof. Ed Cheng, Spring 2011 Homework 4 solutions NOTE : Solutions for HW problems that are based upon textbook problems reflect numerical values from the text. Numerical values may differ for these problems when they appear on iLearn. In such cases, the solution presented below provides the appropriate solution method . 1. The correct answer is (a). 2. The correct answer is (c). Comments about 1-2: Despite their confusing names, the specific heat at constant volume c v is always used to evaluate internal energy changes; the specific heat at constant pressure c p is always used to evaluate enthalpy changes. Neither one is limited to application in only constant-volume or constant-
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: pressure processes. 2, 3: San Francisco State University ENGR 303: Engineering Thermodynamics School of Engineering Prof. Ed Cheng, Spring 2011 HW 4 solutions 2 Dividing through by the mass m gives: out b in pw out w w q , , Where in pw w , is given as 50 kJ/kg and 1 2 , ln v v RT Pdv w out b (boundary work per unit mass for an isothermal process ideal gas; = 94.6 kJ/kg Therefore, q out = 44.6 kJ/kg 6. The correct answer is (b). 7. The correct answer is (d). The massflow rate must be equal at the inlet and outlet (for a single-stream device); however, the volume flow rate may differ if the density of the fluid differs. 4: v 2 / v 1 = V 2 / V 1 = 3 is given)...
View Full Document

Page1 / 2

HW04_solns[1] - pressure processes. 2, 3: San Francisco...

This preview shows document pages 1 - 2. Sign up to view the full document.

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