Technical information

SELECTION EXAMPLE
A chiller is required to chill water from 13°C to 7°C, with a cooling capacity of 119 kW.
There are also other design conditions:
• Ambient air entering the condensing unit 35°C
• Fouling factor: 0.044 m
2
°C/kW
• Altitude: Sea level
Taking a quick look at the table, we can see that a YLCA 120 unit gives an approximate required capacity
of 119 kW.
As the factors appearing in Tables and Altitude factors, see on page 18 are not applicable, the conditions
will be as follows:
• Cooling capacity: 119 kW
• Power consumed: 40 kW
• Water temperature: 13°C to 7°C (Temp. difference of 6)
Water flow =
119 x 860
= 17 056 l/h
6
Available pressure in hydraulic circuit of a unit with pack:
• From the table we infer that the YLCA 120 TP, with a 17 056 l/h flow, has an available pressure of
279 kPa.
Pressure drop in hydraulic circuit of a unit without pack:
• From the table we infer that the YLCA 120 T, with a 17 056 l/h flow, has an available pressure drop
of 23 kPa.
Pressure drop in filter:
• From Table Pressure drop in filters, see on page 22 , 2 ½" filter, we infer that with a 17 056 l/h flow,
said filter has a pressure drop of 2.4 kPa.
YLHA selection method
1 Determine the correct size of the YLHA unit by selecting a model from Tables 3, 4 and 5 that is closest
to the cooling and heating capacities required in the design conditions of the water outlet and air inlet
temperatures.
2 Apply fouling (Table 11) and altitude (Table 12) correcting factors to the capacity and power values
that appear in the corresponding capacity tables in cool and heat. Make sure the corrected capacity
is still sufficient for your needs.
3 Using the corrected capacities of the unit, select the design temperature differential, or the flow.
4 Check to make sure that these selections are within the YLCA/YLHA operating limits.
Technical Information
1
Selection guide (YLCA/YLHA) 1.5
11