HVAC Hacks - Module 3 Heating & Cooling Load Calculations - Essential Tips & Rules of Thumb
- By Usman Naseer
- 0
Course Description
This opening lesson explains the course objectives, expected outcomes, and the role of accurate load calculations in HVAC design.
What you'll learn in this course?
By the end of this course, learners will be able to:
Explain the fundamental principles of heating and cooling load calculations using industry-recognized methods.
Apply practical rules of thumb for quick load estimation during preliminary design stages.
Identify key factors influencing building thermal loads, including envelope, occupancy, lighting, and equipment.
Perform basic manual load calculations using simplified CLTD/CLF methods.
Avoid common mistakes in load calculations that lead to oversized or undersized HVAC equipment.
Interpret load calculation reports from software such as Manual J, HAP, or Trace 700.
Integrate load calculation results with equipment selection and duct sizing.
Apply energy code requirements (ASHRAE 90.1, IECC) to load calculation inputs.
Use spreadsheet-based tools for sensitivity analysis of design variables.
Prerequisites
Basic HVAC knowledge, heat-transfer fundamentals, psychrometric terminology, and engineering units
Familiarity with building envelopes and equipment sizing is helpful
Course Curriculum
- Course Overview & Learning Objectives
- Why Accurate Load Calculations Matter
- Real-World Consequences of Incorrect Loads
- Key Industry Standards & Methods
- The Difference Between Heating and Cooling Loads
- Why Intermediate Level? What You Should Already Know
- How This Module Fits Into the HVAC Hacks Series
- Course Materials & How to Take Notes
- Key Terminology - Heat Gain vs. Heat Loss
- Sensible vs. Latent Load - Critical Distinction
- Design Conditions - Indoor & Outdoor
- Psychrometric Chart Basics for Load Calculation
- Enthalpy - The Hidden Factor in Cooling Loads
- Infiltration vs. Ventilation - Don’t Confuse Them
- Thermal Mass & Its Effect on Peak Loads
- Heat Transfer Mechanisms - Conduction
- Heat Transfer Mechanisms - Convection
- Heat Transfer Mechanisms - Radiation
- U-Values and R-Values in Practice
- Windows - The Weakest Link Thermally
- Example: Conduction Through a Wall
- Cooling Load Factors - The Big Picture
- Solar Load Through Windows - Step by Step
- Internal Loads - People
- Internal Loads - Lighting
- Internal Loads - Equipment
- Infiltration Load Calculation (Cooling)
- Ventilation Load Calculation (Cooling)
- Zone vs. Block Load - Why Room-by-Room Matters
- Cooling Load Calculation Methods Compared
- Heating Load Fundamentals - What’s Different
- Heating Load - Conduction Formula
- Infiltration for Heating - The Cold Draft Problem
- Ventilation for Heating - No Latent Credit
- Example: Small Office Heating Load
- Degree Days - A Useful Planning Tool
- Rules of Thumb - When and How to Use Them Safely
- Residential Cooling Rule of Thumb (USA)
- Residential Heating Rule of Thumb
- Commercial Cooling Rule of Thumb (Sq. Ft. Per Ton)
- Rule of Thumb for Ventilation Load
- When Rules of Thumb Fail - Real Examples
- Step-by-Step Manual Calculation - Building Description
- Step 1: Envelope Conduction Cooling (CLTD Method)
- Step 2: Solar Load Through Windows
- Step 3: Internal Loads (Cooling)
- Step 4: Infiltration & Ventilation (Cooling)
- Step 5: Total Cooling Load & Equipment Sizing
- Common Mistake #1: Ignoring Solar Orientation
- Common Mistake #2: Double-Counting or Missing Infiltration
- Common Mistake #3: Wrong Design Conditions
- Common Mistake #4: Adding Unnecessary Safety Factors
- Common Mistake #5: Using Block Load for Room-by-Room Design
- Quality Checklist Before Finalizing Loads
- Common Mistake #1: Ignoring Solar Orientation
- Common Mistake #2: Double-Counting or Missing Infiltration
- Common Mistake #3: Wrong Design Conditions
- Common Mistake #4: Adding Unnecessary Safety Factors
- Common Mistake #5: Using Block Load for Room-by-Room Design
- Quality Checklist Before Finalizing Loads
- Summary - Part 1 of 2
- Summary - Part 2 of 2
- HVAC Hacks - Module 3: Heating & Cooling Load Calculations - Essential Tips & Rules of Thumb
Usman Naseer
4 
Course includes:
Levelintermediate
Duration240 minutes
Lessons63
Quizzes0
CertificationsYes
Enrolled0