DIANREZHANELECTRIC HEATINGKnowledge中文
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.
K38Electric Circulation Heater Pressure Drop: Checks Before Changing the PumpSeparate heater pressure drop from system resistance. Check pressure taps, flow, cold-start viscosity, strainers and baffles before reviewing the pump duty point.Fluid heatingK39Expansion Tanks in Thermal Fluid Systems: Role, Flow Path and Sizing BasisUnderstand the role of an elevated thermal-fluid expansion tank, its connection to the main loop, preliminary expansion calculations and layout limitations.Thermal fluid systemsK40SCR vs. Contactor Control for Electric Heaters: How to ChooseCompare SCR and contactor heater control by modulation, temperature response, maintenance and panel design, including independent overtemperature shutdown.Heater controlsK1Why 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 specificationThis guide covers the heat-duty formula, common property values, additional loads and the process data needed for a preliminary quotation.Sizing BasicsK7What watt density should an electric heater tube use?How to calculate watt density, the working ranges for water, oil, still air and forced air, and the four mistakes that burn tubes: total power only, heated length, scaling and supply voltage.Immersion heaterK8How to support a pipeline heater and allow for expansion?Bracket layout for pipeline heaters, expansion growth by material, why both-ends-fixed joints leak, and the cold-plus-hot commissioning checks.Pipeline heaterK9What protection settings does an electric thermal oil heater need?The four guards on electric thermal oil heaters — outlet high limit, low level, loss of circulation and sheath over-temperature — their action order, why film temperature governs, and typical missettings.Thermal oil heater