Air Duct Heater Calculation

Air duct heaters df di series duct heater caloritech air duct heaters are designed for use in comfort heating applications such as makeup air heating air preheating air handling equipment fan coils terminal reheating multizone reheating heat pump auxiliary systems and return air heating.

Air duct heater calculation.

To maintain a house s energy efficiency the correct heating duct sizes are crucial. The three types of air duct heaters are stab in no ducting supplied flanged or circular heater. Air duct heater air heating units we design and supply bespoke air duct heaters for the heating and ventilation industry manufacturers of air handling units and process ovens. Air ducts friction loss diagram a major loss diagram for air ducts imperial units ranging 10 100 000 cfm.

The air flow should be in the. Air ducts sizing air flow and required duct area. Once the volume of air in standard cubic feet per minute scfm and the required temperature rise in f δt are known the required kilowatt rating kw of the heater can be determined from the following formula. How to design a duct system.

Filters and air heater or cooler will be located. Duct sizing duct calculation duct design energy efficient ductwork design. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. These take into account not only the output of the unit and the length of duct work but the type of duct material the loss of air flow due to friction and.

This is a calculation of the current flow in each of the three lines regardless of whether the elements are connected in a wye or a delta. This is an estimate only and will vary with the. Calculations for heating air in a duct. Minimum air velocity required for the duct heater is determined from the charts below.

Ducts that are too large will decrease the air flow velocity thereby allowing air to cool or warm before it reaches the registers. Guide for how to design a ductwork system. Air ducts velocity diagram air flow volume duct size. Kw scfm x δt 3193.

There are mathematical formulas for calculating the air flow to and from a heating unit but the air conditioning contractors association simplifies the process in a series of manuals. Some houses have ducts that are too large or too small. Includes a full worked example as well as usin.