Cooling And Heating Coils Pressure Drop - Carrier 42BJ ULTRA Selection Manual

11.3 - Cooling and heating coils pressure drop

11.3.1 - Water pressure drop, 5-rows coil
Sizes 1.6 & 2.6
Size 2.6
Size 1.6
Sizes 4.7
Size 4.7
NOTES:
The curves are plotted for water temperature:
• Heating: 50°C
• Cooling: 6°C
To convert l/h to l/s please divide by 3600
Recomended coil water quality
Art installation handover, and then periodically every year, it
is advised to analyse the water for bacteria (detection of ferro-
bacterias, H2S producing and sulphate reducing bacteria) and
chemicals (in order to avoid problems due to corrosion and
scaling).
The water circuit must include alle the necessary elements for
the treatment of the water: filters, additives, intermediate
exchangers, purges, drains, isolating valves, tec., according to
the analysis result.
32
The result must be in accordance with the values shown below:
• Total hardness in French degrees: 10 < TH < 15
• Chloride [CL-]
• Sulphate [SO 2-
4
• Nitrate [NO -
3
• Dissolved iron
• Dissolved oxygen
• Carbon dioxide [CO
2]
• Resistivity
• pH
Pressure drop (kPa)
Pressure drop (kPa)
10 mg/l
30 mg/l
= 0 mg/l
< 0.5 mg/l
4 < [O ] < 9 mg/l
2
< 30 mg/l
2000 < Resistivity < 5000 Ωcm
6.9 < pH < 8