Residential Hvac Duct Design Example

How to design a duct system.

Residential hvac duct design example. That is really shocking. And i ve seen a lot of times how hvac contractors changed duct designs made by engineers. But what i experienced as a new residential hvac service technician. 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. For example if the gauge reads 10 psig then using the above equation the absolute pressure would be 24. Designing a duct system is important but there are a few critical steps that come first. 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. Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals. 1 psi equals 27 7 inches of water gauge. Larger volumes or higher static pressures should be dealt with on an individual job basis.

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

Ductwork is simply an air delivery system. In this video we ll be learning how to size and design a ductwork for efficiency.