Page 8 - Resterm

INDUSTRIAL HEATING EQUIPMENT

INDUSTRIAL HEATING EQUIPMENT

Calculations

Capacity Calculation

• Exit temperature of electric heaters should be
designed as 50°C maximum. Pressure Drop (Pa)
• Air speed within the electric heater must be
1.5 m/sec.
P = 0,36 x Q x ΔT
P = Total Power (W) Basınç Kaybı Hesabı : Air Speed (m/s)
Q = Air Volume (m /h) P
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X = --------------
ΔT = Temperature S x 15 Pressure loss in the duct depends on design
Difference (°C) X = Heater Resistance Ordinal number speed and heating element ordinal number.
Heating element ordinal number is calculated
P = Total Power (kW) through the formula located on the next
S = Cross Section (m ) (S = A x B) side and ordinal number and pressure loss
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corresponding available air speed on the
graphic above are found.
Points To Be Taken Into

Account During Mounting

• The electrical connection box should not be
located on below level so that the condensation in
the duct does not damage the heater.
• Mounting of the equipment such as fan, bend
and damper should be within a specific distance
to provide proper air-flow on duct type heater.
This distance is twofold of diagonal length of
rectangular type heater and twofold of diameter of
the duct type heater for circular type.

Quality Control Tests

Heating elements/Duct type heaters whose
production is completed, are subject to functionality
and electrical safety tests stated below:

• High voltage test
• Leakage current test
• Hot Insulation test
• Cold Insulation test
• Operational scenario test (optional)

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