Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

412 Chapter 13 Energy and Power

13.21.Visit a flat panel solar collector manufacturer and

obtain data sheets including cost and efficiencies for

single-pane and double-pane collectors.

13.22.The masonry wall shown in Figure 13.27 is commonly

referred to as a “Trombe” wall in honor of Felix

Trombe who developed this concept. Investigate the

factors that must be considered when sizing (thickness)

the “trombe” wall. Write a brief report discussing your

findings.

13.23.The photovoltaic systems are designed based on “Peak

Sun Hours.” What is peak sun hour?

13.24.You may have noticed that solar collectors are slopped

at a certain angle. Investigate the tilt of solar collectors.

What is a collector tilt based on? Write a brief report

discussing your findings.

13.25.For a wind turbine, look up the definition for the fol-

lowing terms: rotor solidity, tip speed ratio, capacity

factor, and Betz limit. Write a brief report discussing

your findings.

Objective:To design a catapult system from the materi-

als listed that throws a ping-pong ball a maximum dis-

tance in a specified direction. During the launch

process, the catapult system must be handled by one

team member alone. Each team is allowed one practice

launch. Thirty minutes will be allowed for preparation.

Provided Materials:8 rubber bands; 20 inches of adhe-

sive tape; 20 inches of string; 2 Dixie cups; 2 sheets of

paper ( 8  11 each); 4 plastic drinking straws; 2

plastic spoons; 8 popsicle sticks ; 4 thumb tacks; a ping-

pong ball.

The system that throws the ping-pong ball the max-

imum distance along the specified direction wins.

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2

Impromptu Design VI

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