Cartridge Heater Watt Calculation

The first thing to know is how many pounds of air need to be heated.

Cartridge heater watt calculation.

For calcualation purposes stock cartridge heaters have a 1 4 unheated length at each end. Watt density w p x d x hl. A factor of 10 is adequate for small systems that are closely calculated. Heat calculations watt density for cartridge heaters other heater applications.

Kw w x c x t w weight of material in lbs. 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. The size of the safety factor is dependent on the accuracy of the wattage calculation. It is the number of watts per square inch of heated surface area.

Thus for a 1 2 x 12 heater rated 1 000 watts the watt density calculation would be as follows. Follow the formula in this video given by chet omega engineer to understand exactly the type of surfac. Kw wt x cp x δ t 3412 x h where. 20 additional wattage is more common.

You can use the following formula to determine your required wattage. Manual calculation of total heat requirements for insertion heaters applications. Kw your kilowatt requirement. So the formula for calculating heat loss due to radiation is.

Calculate watt density and fit after the wattage for each heater has been established the watt density and fit must be calculated. 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. Are you looking to calculate surface heater wattage. Then use graph g 235 to be sure that the watt density is within allowable limits.

Kw scfm x delta t 3000 x 1 2 this formula can be used for standard air. How to calculate required wattage. Suppose you wanted to calculate the radiation loss. Cartridge heaters electric insertion heaters immersion heaters square metric imperial cartridge heaters technology for industry toll free.

Thus for a 1 2 x 12 heater rated 1000 watts the watt density calculation would be as follows. For example a 1 2 x 12 cir heater rated 1000 watts has a watt density of 55 w in2. In order to determine whether a particular heater will perform well in your application you must compare its wattage with your requirements.