Duct Layout Hvac Duct Design Example

Microsoft word understanding basic residential ductwork design doc.

Duct layout hvac duct design example.

Adapt the design to the type of unit. System is designed to move 3 ton of a c or 1200 cfm. Ensure proper ductwork sealing. Designing a duct system is important but there are a few critical steps that come first.

The most common design trunk line layout is provided in the. Choose the right duct size and layout. The horizontal lines are for volume flow rate. 1 psi equals 27 7 inches of water gauge.

The manual d is a complete schematic drawing of the duct system including locations and sizes of trunk lines branch ducts outlet registers an inlet grilles. How to design a duct system. One on a concrete. Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less.

Duct sizing for the two examples would certainly be very different. The downward diagonal lines are for velocity the upward diagonal lines are for duct diameter. Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals. Includes a full worked example as well as usin.

You ve got to know how much heating and cooling you need for each room in btu hr. For example if the gauge reads 10 psig then using the above equation the absolute pressure would be 24. Design master hvac is an integrated hvac building design and drafting program that runs on top of autocad. Once all the system variables have been decided your hvac design professional can determine the most efficient ductwork design layout and calculate the correct duct size.

The diagram above illustrates the fact that the air handler may be centrally located preferred or located elsewhere dependent upon the configuration of your home. Above and below are examples of simple hvac duct systems. Drafting features include single line and double line 2d ductwork with automatic fittings and 3d ductwork. To account for all the necessary factors many professionals use a tool called acca manual d.

Flexible duct work must be stretched tightly for maximum air flow. In this video we ll be learning how to size and design a ductwork for efficiency. 10 psig 14 7 psi 24 7 psia. The layout of the chart does vary a little depending on the manufacturer but in this example the vertical lines are for pressure drop per meter of duct.