Regarding the surface temperature of the heating element in electric heaters

Shared a post: How to estimate the surface temperature of an electric heating element? Sometimes, I encounter customers who are not very familiar with electric heating elements; they often ask what temperature a certain electric heating element can reach At this point, we usually ask what the power of the heating element is What medium is being heated? Some customers will get impatient and say not to ask them anything else; just tell them to heat it to what temperature. Hearing such a response leaves us feeling helpless, because the surface temperature of an electric heating element is determined by the surface load on it, and the surface load in turn is determined by the surface area of the element and its power. If you don’t tell me anything, I’m sorry, but I have no way of knowing to what temperature a particular electric heating element can heat up. Of course, we can only think this to ourselves in our minds – the customer is king, after all; we definitely can’t offend them. Usually at this point, we patiently explain to the customer how we estimate the surface temperature of the electric heating element. I. Determining the surface load of the electric heating element 1. Definition of surface load: The surface load refers to the power per unit area on the surface of the electric heating element, expressed in W/cm2. 2. Formula for calculating the surface load: Power W / [Diameter of tube (cm) * 3.14 * L (cm)], where L refers to the total length of the heating area of the electric heating element. II. Determining the operating environment for the electric heating element 1. Heating of liquids: Since the electric heating element heats the liquid, as in the case of flange-type electric heating elements used in water tanks, its surface temperature is quickly absorbed by the liquid; therefore, it is not possible to accurately estimate the surface temperature of such heating elements. 2. Air heating (1) Still air: When heating in still air, it is simple to estimate the surface temperature of the electric heating element, just like in the case of single-element electric heating elements used in molds. When the surface load reaches 1 W/cm2, the surface temperature of the heating tube can reach 300 degrees ； When the surface load reaches 2 W/cm2, the surface temperature of the heating tube can reach 420 degrees ； When the surface load reaches 3 W/cm2, the surface temperature of the heating tube can reach 500 degrees ； When the surface load reaches 4 W/cm2, the surface temperature of the heating tube can reach 580 degrees ； When the surface load reaches 5 W/cm2, the surface temperature of the heating tube can reach 630 degrees ； When the surface load reaches 6 W/cm2, the surface temperature of the heating tube can reach 680 degrees ； (2) Moving air: When heating in moving air, similar to a duct-type heater, the relationship between the surface load on the electric heating element and its surface temperature varies depending on the wind speed. Therefore, estimating the surface temperature of the electric heating element is somewhat more complex in moving air compared to still air. a. When the wind speed is 3 m/s, with surface loads on the electric heating element of 1 W/cm2, 2 W/cm2, 3 W/cm2, and 4 W/cm2 respectively, the surface temperature of the heating element can reach approximately 140 degrees, 270 degrees, 360 degrees, and 440 degrees respectively. b. When the wind speed is 6 m/s, the surface temperature of the electric heating tube can reach approximately 110 degrees, 200 degrees, 280 degrees, 330 degrees, 395 degrees, and 440 degrees respectively when the surface load on the tube is 1.2 W/cm2, 2 W/cm2, 3 W/cm2, 4 W/cm2, 5 W/cm2, and 5.7 W/cm2. c. When the wind speed is 9 m/s, the surface temperature of the electric heating element can reach approximately 100 degrees, 150 degrees, 210 degrees, 280 degrees, 320 degrees/360 degrees respectively, when the surface load on the element is 1.4 W/cm2, 2 W/cm2, 3 W/cm2, 4 W/cm2, 5 W/cm2, and 5.7 W/cm2. d. When the wind speed is 12 m/s, the surface temperature of the electric heating tube can reach approximately 110 degrees, 120 degrees, 180 degrees, 230 degrees, 280 degrees, and 320 degrees respectively, when the surface load on the tube is 1.8 W/cm2, 2 W/cm2, 3 W/cm2, 4 W/cm2, 5 W/cm2, and 5.6 W/cm2. From the above description, I believe everyone should now know how to estimate the surface temperature of an electric heating element Therefore, if you, as a customer, want to know the surface temperature of the heating element, you need to provide us with some parameters; only in this way can we give you an accurate estimate of the surface temperature of the electric heating element as soon as possible.