Residential Hvac Duct Design Example

This hvac for beginners section begins here with a discussion about forced air duct systems the basics the how and why of duct sizing.

Residential hvac duct design example.

Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less. Hvac for beginners the residential forced air duct system. For example if the gauge reads 10 psig then using the above equation the absolute pressure would be 24. They don t do it and don t care.

But what i experienced as a new residential hvac service technician. 1 psi equals 27 7 inches of water gauge. Includes a full worked example as well as usin. Typical trunk and branch duct systems.

In this video we ll be learning how to size and design a ductwork for efficiency. That is really shocking. Ductwork is simply an air delivery system. You ve got to know how much heating and cooling you need for each room in btu hr.

10 psig 14 7 psi 24 7 psia. A unfortunately majority of residential hvac contractors have no idea of the heat gain loss calculations and duct design. Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals. The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. How to design a duct system.