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If different pressure drops are needed, the cooling capacity shall be corrected with the following formula:
Where:
Pf: cooling capacity
P : cooling capacity shown into table 1
Le : equivalent length of table 1
Leff : actual equivalent length
ΔT : required pressure drop
ΔTtab: pressure drop shown into table 1
The equivalent length can be calculated as follows: A fictitious length for each curve or branch or concentrated drop
shall be added to the real lengths, corresponding to the linear tube length that would give the same pressure drop
caused by the curve or by the branch.
Those fictitious lengths are shown in table 2 and shall be considered effective for fully open valves.
Table 2: Equivalent lengths (in meters) for concentrated drops.
Table 1 is referred to a condensation temperature of 40°C. In case of different condensation temperatures the following
correcting values shall be applied to the cooling capacity.
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