Title: Unit 2 Outline
Course: HET 230 - Spring 2015 > Section: HET 230 - Spring 2015

Unit 2 Outline

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Unit 2 Outline

Introduction:

Last week, we discussed the basic importance of Air Movement and Ventilation, as well as, some of the common terms used throughout the industry.  To become a knowledgeable technician, one must become familiar with the proper terminology and methods used to obtain the proper measurements necessary to determine airflow and movement when sizing ductwork.

This week, you will learn the common formulas, and mathematical calculations, in determining cross sectional area of both square and round duct.  You will also learn, and reinforce, new vocabulary to help you gain a better understanding of these concepts.  In addition, you will be provided a PowerPoint a presentation, weekly study materials.  You will also participate in weekly discussions and complete all assignments and a content assessment quiz.  You will also learn how to calculate dimensions, for layout obstructions, substituting a standard to nonstandard duct sizing for the same dimensional area, and replacing square duct with round duct.  You will learn the principles of Calculating Air Quality and Velocity, forming solid foundation for the next week’s session, Pressure, Airflow and Dynamic Loss in a Duct

Objectives:

On completion of this week’s assignments, the student should be able to:

- apply the proper formula, or equation, to change square inches to square feet
- apply the proper formula, or equation, to change square feet to square inches
- apply the proper formula, or equation, to find the cross sectional area of a square or round duct
- determine the diameter of a round duct
- demonstrate how to find a duct side dimension for substituting a standard size to nonstandard size duct with the same area for layout obstructions
- determine how to calculate, replacing a square with a round duct to utilizing the same area needed
- define Air Quantity and Air Velocity in relation to duct size in both square and round duct
- apply the proper formula, or equation, to find Air Quantity
- apply the proper formula, or equation, to find Air Velocity

Review the vocabulary terms listed below and look up their definitions / descriptions before taking the Vocabulary Quiz.

Vocabulary

Air Quantity (CFM)

Air Velocity (FPM)

Area

Area of a Circle

Diameter

Duct Transition

Feet per Minute (FPM)

Foot

Inch

Square Foot (sq. ft./ft^2)

Square Inch (sq. in./in^2)

Square Root

Radius