05.04.2016 Views

Modern Engineering Thermodynamics

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

32 CHAPTER 1: The Beginning<br />

FIGURE 1.34<br />

Problem 64.<br />

40.0 × 10 3 rpm<br />

Mass = 100. lbm<br />

27.0 inch diameter<br />

magnetic bearings (Figure 1.34). If this flywheel can be<br />

represented as a thin disk with a mass of 100. lbm,<br />

determine<br />

a. The rotational kinetic energy stored in the flywheel.<br />

b. The energy storage capacity of this flywheel in W · h/lbm.<br />

65. Determine the energy-storage capacity in W·h/lbm of the<br />

impeller in the Anatomy of an Accident case study presented in<br />

this chapter.<br />

66.* A manufacturer of a thin disk energy-storage flywheels claims to<br />

have a flywheel made of a composite material mounted on<br />

magnetic bearings. If the flywheel turns at 200. × 10 3 rpm and<br />

has an energy-storage capacity of 50.0 W·h/kg, determine the<br />

diameter of the flywheel.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!