Air Duct Heater Calculation

Air ducts friction loss diagram a major loss diagram for air ducts imperial units ranging 10 100 000 cfm.

Air duct heater calculation.

Calculations for heating air in a duct. 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. To maintain a house s energy efficiency the correct heating duct sizes are crucial. Guide for how to design a ductwork system.

Kw scfm x δt 3193. The three types of air duct heaters are stab in no ducting supplied flanged or circular heater. 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. How to design a duct system.

Full worked example included with cfd simulations to optimise your design to ensure the highest energy efficiency. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Duct sizing duct calculation duct design energy efficient ductwork design. 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.

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. Air ducts velocity diagram air flow volume duct size. Includes a full worked example as well as usin. The air flow should be in the.

Some houses have ducts that are too large or too small. 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. This is an estimate only and will vary with the.

Air ducts sizing air flow and required duct area. Minimum air velocity required for the duct heater is determined from the charts below. In this video we ll be learning how to size and design a ductwork for efficiency.