Kw wt x cp x δ t 3412 x h where.
Cartridge heater watt calculation.
For example a 1 2 x 12 cir heater rated 1000 watts has a watt density of 55 w in2.
A factor of 10 is adequate for small systems that are closely calculated.
20 additional wattage is more common.
How to calculate required wattage.
The size of the safety factor is dependent on the accuracy of the wattage calculation.
Calculate watt density and fit after the wattage for each heater has been established the watt density and fit must be calculated.
For calculation purposes cir stock cartridge heaters have 1 4 unheated length at each end.
Cartridge heaters electric insertion heaters immersion heaters square metric imperial cartridge heaters technology for industry toll free.
Watt density w p x d x hl.
Watt density w π x d x hl.
For calcualation purposes stock cartridge heaters have a 1 4 unheated length at each end.
Kw w x c x t w weight of material in lbs.
Then use graph g 235 to be sure that the watt density is within allowable limits.
You can use the following formula to determine your required wattage.
The first thing to know is how many pounds of air need to be heated.
Are you looking to calculate surface heater wattage.
So the formula for calculating heat loss due to radiation is.
Kw scfm x delta t 3000 x 1 2 this formula can be used for standard air.
Manual calculation of total heat requirements for insertion heaters applications.
In order to determine whether a particular heater will perform well in your application you must compare its wattage with your requirements.
Heaters should always be sized for a higher value than the calculated figure.
Follow the formula in this video given by chet omega engineer to understand exactly the type of surfac.
L radiation radiation loss w in 2 x area x emissivity x 1 hr for example assume the tin block has a radiation loss of 1 1 w in 2 and an emissivity of 0 04.
Standard air is 70 degf 14 psi scfm stands for standard cubic feet per minute and delta t exit temperature minus inlet temperature in degrees fahrenheit.
Thus for a 1 2 x 12 heater rated 1000 watts the watt density calculation would be as follows.
Heat calculations watt density for cartridge heaters other heater applications.
It is the number of watts per square inch of heated surface area.
