HVAC - How to Size and Design Ducts
Course Description
HVAC systems are essential for maintaining indoor environmental quality. They regulate temperature, humidity, and air cleanliness to provide a comfortable and healthy indoor environment. Ductwork plays a central role in this system by acting as the pathway through which conditioned air is distributed. Without properly designed ducts, even the most advanced HVAC unit cannot perform effectively. Poor duct design can result in uneven temperature distribution, increased energy consumption, and reduced system lifespan. Therefore, understanding duct design is not optional-it is fundamental for engineers and technicians working in HVAC systems.
What you'll learn in this course?
Understand the fundamental principles of HVAC duct design systems.
Explain the importance of proper duct sizing in HVAC efficiency and performance.
Identify different types of duct materials and their applications.
Understand airflow concepts including velocity, pressure, and friction loss.
Apply basic formulas used in duct sizing calculations.
Analyze different duct design methods such as Equal Friction and Static Regain.
Perform duct sizing using practical step-by-step approaches.
Understand layout planning for residential and commercial duct systems.
Identify common duct design errors and how to avoid them.
Evaluate system performance based on duct design parameters.
Prerequisites
Basic understanding of HVAC systems, airflow, and engineering calculations
Familiarity with building plans and mechanical services is helpful
Course Curriculum
- Introduction to HVAC Systems
- Purpose of Ductwork
- Types of Duct Systems
- Airflow Fundamentals
- Air Velocity
- Static Pressure
- Friction Loss
- Duct Materials
- Duct Shapes
- Duct Design Methods Overview
- Equal Friction Method
- Static Regain Method
- Velocity Reduction Method
- Load Calculation Basics
- Determining Airflow Requirements (CFM)
- Relationship Between CFM, Velocity, and Duct Size
- Selecting Design Velocity
- Duct Sizing Charts and Tools
- Friction Rate Calculation
- Step-by-Step Duct Sizing Procedure
- Sizing Main Ducts
- Sizing Branch Ducts
- Pressure Loss in Fittings
- Equivalent Length Method
- Balancing Airflow
- Fan Selection and Performance
- Duct Layout Planning
- Minimizing Bends and Turns
- Diffuser and Register Placement
- Return Air System Design
- Duct Insulation
- Noise Control in Duct Systems
- Energy Efficiency Considerations
- Codes and Standards
- Oversized Duct Issues
- Undersized Duct Issues
- Air Leakage Problems
- System Optimization Techniques
- Summary
- HVAC - How to Size and Design Ducts