Residential Hvac Duct Design Example

Designing a duct system is important but there are a few critical steps that come first.

Residential hvac duct design example.

10 psig 14 7 psi 24 7 psia. They don t do it and don t care. How to design a duct system. In this video we ll be learning how to size and design a ductwork for efficiency.

Ductwork is simply an air delivery system. Hvac for beginners the residential forced air duct system. A unfortunately majority of residential hvac contractors have no idea of the heat gain loss calculations and duct design. But what i experienced as a new residential hvac service technician.

Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. That is really shocking. For example if the gauge reads 10 psig then using the above equation the absolute pressure would be 24.

Larger volumes or higher static pressures should be dealt with on an individual job basis. You ve got to know how much heating and cooling you need for each room in btu hr. 1 psi equals 27 7 inches of water gauge. Includes a full worked example as well as usin.

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