8 4 spider system 8 5 radial system.
Hvac duct design example.
The purpose of residential ductwork design is to properly distribute the airflow produced by your heating cooling system to your house.
Let s say we have a section of ductwork that needs to move 400 cfm.
Today i ll start with what you do in the hvac design process before you get to the duct design phase manual d as well as the physics of air flow when it s constrained by ducts.
Understanding basic residential ductwork design please note.
As an equation this is written.
7 1 fan selection example.
Duct sizing for the two examples would certainly be very different.
Here s an example with the new ashrae duct size calculator.
How to design a duct system.
Our friction rate is 0 073 iwc 100.
Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100.
Scroll to the bottom to watch the free youtube video tutorial.
On the friction loss air quantity part of the dial we line up 0 073 with 400 cfm as seen below.
8 7 rules of duct design acca manual d residential duct systems 9 0.
In this video we ll be learning how to size and design a ductwork for efficiency.
Duct system design page 1 5 energy is due to elevation above a reference datum and is often negligible in hvac duct design systems.
We ll include a full worked example as well as using cfd simulations to optimise the performance and efficiency using simscale.
The supply duct system.
8 2 reducing plenum system.
Ductwork design considerations 33 11 1 duct frictional resistance 33 11 2 duct equivalent length 35 11 3 ductwork system effect 35 11 4 installation issues 37 11 5 ductwork insulation 38 11 6 ductwork air leakage 39 11 7 testing methods and equipment 40 11 8 ductwork sealing 41.
8 6 perimeter loop system.
All information provided in this document is to be used as a guideline only.
7 3 fan system effect.
In this article we ll be learning how to size and design a ductwork system for efficiency.
I ll follow that up with articles on the process we use in designing duct systems including available static pressure equivalent length and choosing fittings.
Includes a full worked example as well as usin.
8 1 extended plenum systems.
How to design a duct system.
8 3 reducing trunk system.
Consequently the total pressure or total energy of air flowing in a duct system is generally equal to the sum of the static pressure and the velocity pressure.
