Thermolec Application &Technical Notes Manuale Utente Scaricare il pdf (Pagina 13)

THREE EASY STEPS

STEP 2 - (continued)

Using the Air flow requirement curve above, find 21.66 on the vertical scale.

Read the minimum velocity required on the horizontal axis, which is approx. 1150 FPM.

If it is a 2 stage heater then KW per square foot per stage =

65 KW

= 10.83

3 sq.ft. x 2 stages

In this case 750 FPM are required.

If it is an SCR Controlled heater then 300 FPM are required.

Example:

Find the minimum air flow requirement for a 65 KW 1 stage heater in a 24” wide by 18” high duct.

Calculate duct area in square feet.

Calculate KW

per square foot per stage

Duct Area =

24” x 18”

= 3 square feet

144

KW per square f

oot

65 KW

= 21.66

per stage 3 sq.ft. x 1 stage

Please refer to the table on page 16 for tubular elements.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 72 73

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Thermolec Application &Technical Notes Manuale Utente Pagina 13