Heaters made of steel pipes, part 1

Steel tube heaters

Tubular heaters are made of horizontal or vertical, smooth or finned tubes, through which the heating medium flows.

The figure shows the values of heat transfer coefficients for selected horizontal pipe diameters (forming such heaters) depending on the temperature of the heating medium. They were identified, assuming that the entire surfaces of the conduits can freely exchange heat with air. The average values of these coefficients vary between 10 a 15 W/m²K. When several pipes are placed in a group, the Ug coefficient should be taken as for a single conduit with a diameter equal to the sum of their diameters.. For vertical pipes, the heat transfer coefficient is the same as for a single horizontal pipe with a diameter of approx 200 Mm. In order to obtain the thermal characteristics of smooth pipes, it is possible to use the relationship determining the change of the heat transfer coefficient as a function of changes in temperature differences.

An example of a steam heater made of steel pipes. Marks: 1 – steam supply line with valve, 2 – vertical pipes (collectors), 3 – horizontal pipes, 4 – dummy plug, 5 – return line (condensate runoff) with dehydrator

These heaters can be made in the form of registers, heating risers (rarely used today), ladder heaters or heating coils, mounted on the partitions with the use of special holders and brackets. The main advantages of the heaters in question are the ease of keeping the heating surfaces clean, good conditions for heat transfer, as well as high pressure resistance (10-12 barium).

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