Plumbing, Airflow HVAC Calcs 8.4

This application serves as a practical utility primarily intended for plumbers and HVAC professionals seeking to perform airflow and basic HVAC calculations. It functions effectively as a reference, educational tool, and for managing small-scale projects.

The app offers a suite of calculators including:

• Virtual Airflow (US Units)
• Virtual Airflow (Metric Units)
• Reynolds Number (Metric)
• Reynolds Number (US/Imperial)
• Weight conversions (Ounces, Grams, Pounds, Tons US, Kilograms, Tons UK, Tonnes)

The Virtual Airflow and Reynolds Number calculators aim to provide relevant data concerning the volume of air within a specified space, as well as the appropriate size of air handling equipment necessary to achieve desired airflow rates. These calculations consider air movement introduced by heaters, air conditioners, chillers, refrigeration units, or fans—including evaporative or swamp coolers—as well as exhaust systems.

For distance-based calculations, users should input area dimensions in feet or meters; precision to the inch or centimeter is not required. Input the desired air change rate per hour and the airflow capacity of the chosen fan in cubic feet per minute (CFM) or cubic meters per minute. Upon calculation, the app displays the area volume, time per air change cycle, total volume of air requiring movement in an hour, recommended fan airflow rate, and the number of fans or air handlers needed based on the specified target size.

A general guideline suggests maintaining 4 to 8 complete air exchanges per hour for spaces with filtered or clean air.

The app also includes conversion tools such as:

• Area Converters: Square Inches to Square Feet/Yards/Meters
• Distance Converters: Inches/Centimeters/Millimeters, Feet/Yards/Meters, Miles/Kilometers
• Volume Converters: US/Imperial to Metric and vice versa; Inches/Centimeters; Feet/Yards/Meters

Results can be conveniently emailed via the iOS email application using an automatically generated template.

Features of this application include:

• Email sharing of calculations and conversions
• Universal compatibility with iPhone, iPod Touch, and iPad
• Retina Display graphics for enhanced clarity
• Quick app switching for efficiency
• Automatic saving of user inputs for convenience
• No internet connection required

All information provided is for informational purposes only and should be used accordingly. Caution is advised when applying these calculations to open fan blades installed in ceilings higher than 12 feet or with fans rated based on room square footage rather than cubic footage.