How to use water cooling coils diagrams:
Air Speed. Starting from 900 m3/h on the air flow scale draw a vertical line 1 till the air speed axis. It makes 3.2 m/s.
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Supply air temperature. Prolong the line 1 up to the point where it crosses the outside air temperature (e.g. +32°C); then draw a horizontal line 2 from this point to the left till crossing the outside air humidity (e.g. 50%). From this point draw a vertical line 3 to the supply air temperature at cooler outlet axis on top of the graphic (+20.1°C).
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Cooling capacity. Prolong the line 1 up to the point where it crosses the outside air temperature (e.g. +32°C) and draw a horizontal line 4 from this point to the right until it crosses the outside air humidity curve (e.g., 50%), from here draw a vertical line 5 up to the scale representing the cooler capacity (6.5 kW).
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Water flow. Prolong the line 5 down to water flow axis at the bottom of the graphic 6 (0.26 l/s).
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Water pressure drop. Draw the line 7 from the point where the line 6 crosses the black curve to the pressure drop axis (15.0 kPa).