The duct insulation r values i mentioned above are what s on the product label.
Air duct insulation thickness calculation.
This chart can be.
Air handling ductwork cross section design.
Air state calculation during heating and heater output.
Hvac calculations and duct sizing gary d.
The tee section at the far end of the main duct causes the air to suddenly divide and change direction.
R 6 duct insulation 6 305 btu hour 0 53 ton r 4 2 duct insulation 7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.
Fibrous glass duct wrap insulation is designed for application to the exteriors of commercial and residential sheet metal heating ventilating and air conditioning ducts and plenums operating at temperatures between 40 f 4 c and 250 f 121 c.
A diffusion tight application is a must minimum insulation thickness 7 6 mm tube diameter 25 4 mm.
How often do you think you get the full labeled r value.
Some other factors to consider.
Local resistance pressure loss general calculation.
Ductwork specific pressure loss calculation.
General formula to calculate minimum insulation thickness required to prevent condensation t k r t1 t2 t3 t1 where t insulation thickness in k thermal conductivity r surface temperature resistance t1 dew point temperature.
The sharp turns cause a large amount of recirculation regions within the ducts preventing the air from moving smoothly.
There is a high amount of backflow here which again increases the static pressure and reduces the amount of air delivery.
Enter the ambient temperature the average temperature of the air surrounding the duct line 3.
Thermal insulation and ductwork heat loss calculation.
Enter the r value of the selected duct insulation.
Enter the flow rate of the air carried by the duct in cubic feet per minute.
Note that the r in equation 2 is the factor often found on blanket insulation.
Enter the length of the duct run in feet.
Ductwork support ductwork support and recommended.
Heat conduction and thermal resistance.
Duct wrap insulation reduces heat loss or gain through duct walls conserving energy.
Mass air flow rate unit converter.
Duct velocity calculate velocities in circular and rectangular ducts imperial and si units online calculator.
Ductwork seal classes ductwork prone to air leakages.
Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more.
