Air Duct Heater Calculation

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.

Air duct heater calculation.

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. L air flow rate m 3 s q heat loss covered by the air heating system kw c p specific heat air 1 005 kj kg o c ρ density of air 1 2 kg m 3 t h heating air temperature o c t r room temperature o c as a rule of thumb the air heating supply temperature should be in the range 40 50 o c. 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. Air ducts friction loss diagram a major loss diagram for air ducts imperial units ranging 10 100 000 cfm.

Duct sizing duct calculation duct design energy efficient ductwork design. In this video we ll be learning how to size and design a ductwork for efficiency. How to design a duct system. Ducts that are too large will decrease the air flow velocity thereby allowing air to cool or warm before it reaches the registers.

Calculations for heating air in a duct. Guide for how to design a ductwork system. Kw scfm x δt 3193. Includes a full worked example as well as usin.

Air ducts sizing air flow and required duct area. 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. 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. This is an estimate only and will vary with the.

Some houses have ducts that are too large or too small. To maintain a house s energy efficiency the correct heating duct sizes are crucial. The air flow should be in the. Air ducts velocity diagram air flow volume duct size.

Filters and air heater or cooler will be located. 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. Full worked example included with cfd simulations to optimise your design to ensure the highest energy efficiency.