Return Air Duct Design
Not providing enough returns is a common ductwork design flaw that leads to comfort complaints.
Return air duct design. The sensible heat ratio is useful in finding g, the moisture content of air, at different conditions using a psychrometric chart. The furnace or air handler (ahu in the drawing below) pulls air through the return ducts, conditions that air, and then sends it through the supply ducts back into the house. Figure below shows a central heating furnace connected to supply and return air ductwork.
Ducting the return air may be the right choice. To size the branch ducts, select the duct size at the intersecting lines of the friction rate and the room cfm. Trunk and branch duct systems hvac for beginners:
On the system depicted in figure 3 , there was no chance for return air to make it back to the equipment. Square ells, return or supply, are a bad idea. But this is seldom or never true when the ceiling is not divided by full height walls.
The return air ducts in an hvac system are especially liable to get taken for granted, even though their part in heating and cooling your home is just as essential as supply ducts. The problem with bedrooms occurs in houses where the hvac design did not include return vents in each bedroom. Hvac ductwork replacement cost ultimate guide 2020.
An hvac return air duct should be in every room except a bathroom and kitchen. The best solution was to make a custom return duct / boot/ filter holder. A person can be forgiven for not knowing much about their home’s air duct system.
Psychrometric chart a psychrometric chart is a graphical representation of the properties of moist air and is a useful tool in air conditioning calculations. Distribution system comes from the velocity of air in the ducts, supply, or return and the air handling equipment itself. The furnace or air handler is probably on the other side of the wall.
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