Watt temperature conversion5/15/2023 ![]() ![]() Insertion Heaters for- Medical Equipment and Other Industrial Applications.Cartridge Heaters for-Hot Runner Molds, Various Types of Dies.Square and Round Cartridge Heaters for-Hot Plates and Platens, Hot Stamping.Custom Cartridge Heaters for-Packaging Machinery, Labeling and Sealing.Insertion Heaters for-Plastics Extrusion.Metric Heaters for-Plastic Molds and Injection Molding.Cartridge Heaters for-Extrusion Dies, Liquid Immersion.Small diameter/miniature pencil heaters. ![]() Standard imperial and metric round cartridge heaters.Contact National Plastic Heater Sensor and Control Inc’s Sales office.Ĭonsists of the following cartridge/insertion heater categories: Watt density values from the graph should be lowered by about 10% or more when other materials are used which have a lower thermal conductivity or lower emissivity than oxidized mild steel. The graph is based on a 1400☏ resistance wire temperature inside the cartridge heater, when the heater is installed in an oxidized mild steel block. The curves should be considered as guides and not precise limits. Using the Maximum Allowable Watt Density Graph - This graph is useful for choosing type NPH cartridge heaters. Reducing heat requirements by reducing heat losses or by allowing for longer heat up time. ![]() Using longer or larger diameter heaters.Ĥ. Using more heaters of lower watt density.Ģ. If the heater selected had a watt density higher than that allowed by the graph, consider the following changes.ġ. A substantial safety margin would exist and high reliability can be expected. Thus, the actual watt density of 53.64 W/in 2 is well below the maximum allowed. If it were used in a part with an operating temperature of 1000☏ with a fit of 0.01", the allowable watt density from the graph would be 90 W/in 2. For example a 3/4" x 10" heater rated 1200 watts has a watt density of 53.64 W/in 2. Then, use graph below to be sure that the watt density is within allowable limits. Use the Watt Density Calculator Below for Quick Automated Results:Ĭalculate Watt Density and Fit - After the wattage for each heater has been established, the watt density and fit must be calculated. Thus, for a 3/4" x 10" heater rated 1200 Watts, the Watt density calculation would be as follows: For calculation purposes, stock cartridge heaters have a 1/4" unheated length at each end. It is the number of Watts per square inch of heated surface area. The term "Watt density" refers to the heat flow rate or surface loading. ![]() Important Formula To Know: How to Determine Watt Density The sensor for the temperature control should be placed close to the working surface for accurate control. Plan for enough heaters to permit even temperatures through the part during heat-up and operation. Hours = Heat-up time in hours to reach set pointĪutomated calculator tool for calculating heating of solids, fluids or gases within a specific time:ĭetermining, Quantity, Size and Rating -Once total heat requirements are established, the quantity, size and rating of cartridge heaters can be decided. KW = W x C x ?T W = Weight of material in lbs.ģ412 x hrs C = Specific Heat of material ( platen, block etc.) Manual Calculation of total heat requirements for insertion heaters applications: Flagg, page 1-6.Heat Calculations & Watt Density for Cartridge Heaters & Other Heater Applications:
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