Duct Layout Hvac Duct Design Example

Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals.

Duct layout hvac duct design example.

System is designed to move 3 ton of a c or 1200 cfm. 10 psig 14 7 psi 24 7 psia. 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. Ensure proper ductwork sealing.

The horizontal lines are for volume flow rate. For example if the gauge reads 10 psig then using the above equation the absolute pressure would be 24. One on a concrete. Ordinary heating ventilating and air conditioning duct systems read air pressures at 0 4 psi or less often much less.

Drafting features include single line and double line 2d ductwork with automatic fittings and 3d ductwork. Duct sizing for the two examples would certainly be very different. 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. Sketch a rough design using a central supply duct from the unit to the opposite end of the house with branches forking to each outlet.

Flexible duct work must be stretched tightly for maximum air flow. The most common design trunk line layout is provided in the. How to design a duct system. To account for all the necessary factors many professionals use a tool called acca manual d.

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. Includes a full worked example as well as usin. 1 psi equals 27 7 inches of water gauge. Designing a duct system is important but there are a few critical steps that come first.

Duct sizing calculations include constant pressure drop constant velocity and static regain. The downward diagonal lines are for velocity the upward diagonal lines are for duct diameter. Above and below are examples of simple hvac duct systems. Adapt the design to the type of unit.

Getting a complete manual d hvac design done on your property plans is the best way to ensure that your heating and cooling system will deliver maximum comfort at high efficiency a proper hvac duct sizing will guarantee that your. Microsoft word understanding basic residential ductwork design doc. In this video we ll be learning how to size and design a ductwork for efficiency. Design master hvac is an integrated hvac building design and drafting program that runs on top of autocad.