SELECTION EXAMPLE
A cooler is required to chill water from 13°C to 7°C, with a cooling capacity of 5 kW.
There are also other design conditions:
• Inlet ambient air in the condenser 35 °C
• Fouling factor: 0,044 m
2
°C/kW
• Altitude: Sea level
From a quick glance at the table
Cooling capacities YLCA 5 ÷ 27
, see on page 28 it can be seen that
a YLCA 5 gives approximately the required capacity of 5,38 kW.
As the factors appearing in tables
Fouling factors
, see on page 9 and
Altitude factors
, see on page
12 are not applicable, the conditions will be as follows:
• Cooling capacity: 5,38 kW
• Power consumed: 1,87 kW
• Water temperature: 13°C to 7°C (Temp. difference of 6)
Water flow rate =
5,38 x 860
= 771 l/h
6
Available pressure in the unit's hydraulic circuit:
• From Table
Pressure available for the hydraulic circuit and pressure drop in the hydraulic circuit (with‐
out filter mounted)
, see on page 13 we infer that the YLCA 5 MC, with a flow rate of 771 l/h, has an
available pressure of 56 kPa.
Pressure drop in filter:
• From Table
Pressure drop in filters
, see on page 14 we infer that with a flow rate of 771 l/h, there is
a pressure drop of 1,3 kPa.
YLHA PLUS selection method
1 Establish the correct size of YLHA PLUS by selecting the model from the tables
Heating capacities
YLHA 5 ÷ 27
, see on page 27 and
Cooling capacities YLCA 5 ÷ 27
, see on page 28 that is closest
to the cooling and heating capacities required in design conditions of the water outlet temperature
and air inlet temperature.
2 Apply fouling correction factors (table
Fouling factors
, see on page 9) and height correction factors
(table
Altitude factors
, see on page 12) to the capacity and power values shown in the corresponding
tables of capacity for the cool and heat modes. 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 rate.
4 Check to make sure that these selections are within the YLCA/YLHA PLUS operating limits.
Installation manual
1
Selection guide (YLCA/YLHA)
1.4
5
Summary of Contents for Ylha plus 12
Page 4: ...1 Installation manual...
Page 40: ...2 Electric circuit diagrams...
