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NKV 250-4

NKV 250-4

Duct water heater.

  • USWK series

    USWK series


ParameterValueUnit
Weight
10.8
kg
Number of water coil rows
4
Round duct size
250
mm
NKV 250-4
Sizes∅DBHH3LL1L2L3K
mm2484703502703502865270G 1''

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How to use water heater diagrams:

Air Speed. Starting from 1000 m3/h on the air flow scale draw a vertical line 1 till the air speed axis which makes about  3.4 m/s.

  • Supply air temperature. Prolong the line 1 up to the point where it crosses the outside air temperature (blue curve), e.g. -20°C; then draw a horizontal line 2 from this point to the left till  crossing  water in/out temperature curve (70/50 °C). From this point draw a vertical line 3 to the supply air temperature axis on top of the graphic (+28 °C).
  • Heating coil capacity. Prolong the line 1 up to the point where it crosses the outside air temperature indicated as red curve (e.g., -20°С) and draw a horizontal line 4 from this point to the right to the intersection of water in/out temperature curve (e.g., 70/50 °С). From this point draw a vertical line 5 up to the scale of heating coil capacity (19.0 kW).
  • Water discharge. Prolong the line 5 down to water discharge axis at the bottom of the graphic 6 (0.23 l/s).
  • Water pressure drop. Draw the line 7 from the point where line 6 crosses the black curve to the pressure drop axis (17.0 kPa).