380V Single-Head Electric Heating Tube Advantages - Yangzhou Darui
Published: 2020-12-14 09:05:14
Views: 2922
Category: Electric Heating I
Product Description
380V Single-Head Electric Heating Tube Advantages - Yangzhou Darui Darui Electric recommends 1. The element is allowed to work under the following conditions: (1) The relative humidity of air is not more than 95%; (2) The working voltage is not more than 1.1 times the rated value, and the shell should be effectively grounded. 2. When the heating medium is liquid, the effective length (H1 or H2) of the element must be completely immersed in the liquid. The heating part of the element should be at a certain distance from the container wall, generally 50-60mm or more. 3. Elements for heating liquids must not be used to heat gases or solids. 4. For elements heating liquids, if scale or carbon deposits are found on the tube surface, they should be cleaned before use to avoid affecting the service life and reducing thermal efficiency. 5. When melting light metals or nitrates, alkalis, asphalt, paraffin, etc. in solid state, start with reduced voltage and only increase to rated voltage after the solid heating medium is completely melted. 6. Safety measures should be considered when heating nitrates to prevent explosion accidents. 7. The wiring part of the element should be placed outside the insulation layer and heating chamber, and avoid contact with corrosive and explosive gases. The end of the outlet must be kept dry and clean to avoid flashover or short circuit. Do not use excessive force when wiring. 8. A small amount of paste may overflow from the end of the element. This is sealing material and does not affect use. After power off, wipe the overflow clean. 9. Elements should be stored in a well-ventilated room with relative humidity not more than 85% and no corrosive gases. 10. After a period of use and then long-term non-use, if the element becomes damp,380V Single-Head Electric Heating Tubeand its cold insulation resistance is less than 1 megohm, the element can be placed in a drying oven at about 200°C for baking, or directly connected to a reduced voltage for heating to remove moisture until it returns to normal. Product Design and Selection Selection Basis: 1. Internal dimensions of the tank: length × width × height, liquid level height. 2. Process temperature, starting temperature, ending temperature. 3. Process required heating or cooling time (h). Heat exchange (heating, cooling): Q＝V×C×r×β（t2-t1)/T (kcal) V: Solution volume (liters) C: Specific heat of solution (kcal/liter×℃) r: Density (kg/liter) t1: Initial temperature of solution t2: Final temperature of solution β: Heat loss coefficient (take 1.10-1.30) Q: If positive, it is the heat required for heating Q: If negative, it is the cooling capacity required for cooling T: Heating or pre-cooling time h (hours) Electric heat equivalent (electrolytic heat): Q＝0.864×I×V (Kcal/h) I: Total current A V: Tank voltage V Determination of heat exchanger area S: S＝Q/K×ΔT×t Q: Heat exchange (kcal) K: Heat transfer coefficient kcal/m2×hr×℃ (refer to heat transfer coefficient table V) V: Solution volume (liters) ΔT: Average temperature difference t: Set heating (cooling) time (h) Selection:<
