Title: Unit 13 Outline
Course: HET 191 HVACR Heat Load > Section: HET 191 HVACR Heat Load

Unit 13 Outline

Unit 13 Outline
Unit 13 Outline

Sizing Ducts Systems

Objectives

After studying this week’s assignment, the HVAC learner should be able to:

- Develop an appreciation and the importance of the Manual D
- Understand the different types of issues that can effect air flow
- Design a Duct System
- Recognize the different types of duct systems
- Understand the benefits using a blueprint to lay out a duct system
- Understand where to locate the registers and return grilles

Introduction

During the process of determining the heat capacity and amount of air requirement of a residential home, the HVAC designer will use this information to size the ducts for the home. Based on the heat and air flow requirement, the ducts can be sized to help deliver the proper comfort level for the residents in the structure by considering the noise level, CFM, and velocity of air flowing through the duct system. Therefore, the technician and designer will look at these variables to keep from have service issues or customer complaints from a poor design system.

Accuracy

Equal Friction Method Lay Out

Locating the register and grilles

Making a drawing of the lay out

- Showing Details
  - CFM
  - Velocity
  - Static Pressure
  - Size of Ducts
  - Type of Ducts

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

Vocabulary

Terms

- Branch Line
- Supply Truck
- Return Truck
- Register Boot
- Wall Stack
- Plenum
- Return Drop/Plenum
- Equivalent Length