Getting Started
Welcome
Rhvac Online Navigation
Manual J Do's and Don'ts
Overview
Frequently Asked Questions
Technical Support
Training Services
Video Demos
Pages
Project Pages
Load Calculation
General Project Data
Importing Another User's Project
Outdoor Design Conditions
System Data (Load Calc)
Infiltration
Ventilation Rate
Construction Tightness Descriptions
Hot Water Piping Load
Percent Sensible Capacity
Duct Load Factors
Duct Surface Area Calculator
Equipment Data
Hot Water Piping Load
Find HVAC Equipment
Default Room Data
Room Data
Selecting Materials
Radiant Floor Properties
Equipment Cooling Loads
Select Manual J Equipment Load Items
System Concept Warnings
Load Preview
Edit Favorites, Recent, Custom Materials
Upload Favorites, Recent, Custom Materials
Global Material Change
Global Dimension Change
Rotate or Mirror Rooms
Duct Design
Duct Data
Duct Data Example
Select Room Duct Feeds
Select Rooms for Return Duct
Duct Material
Select Fitting Group
Select Fitting
Edit Fitting
Duct Defaults
Set Multiple Duct Properties
System Data (Duct Design)
Global and Project Duct Schedules
Duct Tree Options
Duct Results
Manual S
Manual S Performance Data
Expanded Ratings Data
Manual S Overview
Manual S Performance Data Example 1
Manual S Performance Data Example 2
Manual S Performance Data Example 3
Manual S Performance Data Example 4
Manual S Performance Data Example 5
Manual S Report Section
Calculate Entering Coil Condition
Other Project Pages
Select Reports
Copy Project
New Project
Upload Rhvac Project
Download Rhvac Project
Other Pages
My Main Page
My Account Settings
Page Setup
About Rhvac Online
Options
Announcements
Read Me
Calculations
Calculation Methodology
Equations
Equations (List)
General
Adequate Exposure Diversity
Net Area of Roof
Net Area of Walls
Converting Air Changes per Hour to CFM (Ventilation)
Converting Air Changes per Hour to CFM (Infiltration)
Hot and Chilled Water Flow Rate
Infiltration Adjustment
Heat Loss Equations
Heat Loss Due to Walls - Doors - Glass - Roofs - and Floors
Heat Gain and Loss For Partition Walls
Total Heat Loss Due to the Structural Components of a Room
Heat Loss Due to Ductwork
Heat Loss due to Infiltration and/or Ventilation for the Entire Building
Heat Loss Through A Slab
Heat Loss For Below Grade Walls
Total Heat Loss Per Room
Heat Loss Due To Hot Water Piping
Heat Loss for Entire Building
Heat Gain Equations
Heat Gain for Walls - Doors - Roofs - and Floors
Heat Gain and Loss For Partition Walls
Heat Gain for Glass Not Shaded by an Overhang (Including Glass Doors and Skylights)
Height of Unshaded Portion of Glass
Heat Gain for Glass Shaded by an Overhang
Total Sensible Heat Gain due to Structural Components of a Room
Sensible Heat Gain due to People
Latent Heat Gain due to People
Sensible Heat Gain Due to Lights
Sensible Heat Gain Due to Equipment or Appliances
Latent Heat Gain Due to Equipment or Appliances
Heat Gain Due To Blower Motor
Sensible Heat Gain due to Ductwork
Total Building Sensible Heat Gain Due to Infiltration or Ventilation
Total Building Latent Heat Gain Due to Infiltration or Ventilation
Sensible Heat Gain of a Room
Total Sensible Heat Gain of a Building
Total Latent Heat Gain of a Building
Total Tonnage Required
Grains Difference
CFM Equations
Total Supply CFM Requirement for Heating
Total CFM Requirement for Cooling
Heating Supply CFM Requirement Per Room
Cooling Supply CFM Requirement Per Room
Duct Size Equations
Equivalent Length of Fitting
Barometric Pressure
Air Density
Velocity
Velocity Pressure
Equivalent Circular Diameter (Rectangular)
Reynolds Number
Friction Factor
Colebrook Equation
Duct Surface Area Equations