Air Duct Insulation Thickness Calculation

The sharp turns cause a large amount of recirculation regions within the ducts preventing the air from moving smoothly.

Air duct insulation thickness 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. Duct wrap insulation reduces heat loss or gain through duct walls conserving energy. This chart can be. A diffusion tight application is a must minimum insulation thickness 7 6 mm tube diameter 25 4 mm.

Enter the r value of the selected duct insulation. Air handling ductwork cross section design. Local resistance pressure loss general calculation. Air state calculation during heating and heater output.

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. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Ductwork support ductwork support and recommended. Enter the ambient temperature the average temperature of the air surrounding the duct line 3.

Enter the flow rate of the air carried by the duct in cubic feet per minute. There is a high amount of backflow here which again increases the static pressure and reduces the amount of air delivery. Ductwork specific pressure loss calculation. Enter the length of the duct run in feet.

Ductwork seal classes ductwork prone to air leakages. Mass air flow rate unit converter. Air and is a useful tool in air conditioning calculations. Thermal insulation and ductwork heat loss calculation.

The tee section at the far end of the main duct causes the air to suddenly divide and change direction. Hvac calculations and duct sizing gary d. The duct insulation r values i mentioned above are what s on the product label. Enter the perimeter of the duct in inches.

Heat conduction and thermal resistance. Note that the r in equation 2 is the factor often found on blanket insulation. 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. Some other factors to consider.