DIANREZHANELECTRIC HEATINGKnowledge
INDUSTRIAL HEATING KNOWLEDGE
Straight answers,before you buy.
No brochure language here — just the questions that decide real projects: why thermal oil cokes, how to size duct heaters, how Ex classes actually match, where installations go wrong. Read one, then check your own project against it.
K1Why thermal oil heaters coke up — and how to prevent itCoking is not an oil problem. It is what happens when surface heat flux, flow velocity and film temperature get out of balance — here is how to keep them in line.Thermal OilK2Duct heater power calculation — formula and worked examplesThe standard heat duty formula, airflow unit conversions, how much margin to add — then two real projects calculated end to end.Duct HeatingK3Hazardous-area electric heaters: Group IIB/IIC and temperature class explainedHigher Ex rating is not automatically safer — it is about matching. Zone, gas group and temperature class, one layer at a time.Ex-ProofK4Five installation mistakes that ruin pipeline heatersThe heater was fine; the installation set the trap. Reverse flow, misplaced sensors, no minimum-flow interlock, pipe stress on flanges, missing vents — check your site against this list.Pipeline HeatingK5Why tubular heater elements fail early: sheath material and watt densityTwo 220V 3kW elements — one lasts three years, one lasts three months. The difference is sheath alloy, watt density, medium match and termination quality.Tubular ElementsK6Electric heating duty calculation: from specific heat to a real specificationOne formula covers every medium. Here are the constants you need, the loads people forget, and the parameter list that gets you an accurate quotation.Sizing Basics