THERMODYNAMICS

Reading Assignment #4: Steam Book Chapter 2

Homework Assignment #4: All data will be taken from steam tables, Answers hand written.

SHOW ALL WORK ON CALCULATIONS. Assume Patm is 15 psi.

Round Off all values to the nearest whole number UNLESS specified.

Use Table 1 or Table 2 to answer 1 – 10, 11-15 are review

#1 (2) Find the saturation pressure for 240°F.

#2 (2) Find the saturation pressure for 175°C.

#3 (2) Find the saturation pressure for 265°F.

#4 (2) Find the saturation temperature for 30 psia.

#5 (2) Find the saturation temperature for 330 psia.

#6 (2) Find the saturation temperature for 235 psig.

#7 (10) Answer given the following conditions (include units):

1 Find ʋf at 250°F

2 Find Hg at 700 psig

3 Find ʋg at 100°C

4 Find sf at 175°F

5 Find Hf at 110 psia

A constant pressure system indicates 25 psig on its pressure instrument and contains 7 pounds of water at 95°F

Calculate the following:

#8 (10) How much heat energy needs to be added to reach a final state of 80% steam (H80%).

#9 (10) Calculate the density of the steam at the final conditions.

#10 (8) A steam system operates at its most efficient when the steam contains the greatest amount of energy per pound mass (h). At what saturation conditions does 100% stmsat have the greatest energy?

#11 (5) A 12 pound bowling ball suspended in the air has 450 (you provide units) of potential energy. How high is the bowling ball?

#12 (5) This same bowling ball rolling on a flat surface contains 650 (you provide me the units) of kinetic energy. How fast is the ball rolling?

#13 (5) What type and how much energy does a 27 pound block on top of a 300 ft tower have?

#14 (5) What is the speed of a 5 pound ball traveling with 700 units of energy? What type of energy is this?

#15 (5) Determine Q if the heat transferred per unit mass of a system containing 70 lbm of water is 55 BTU/lbm.