ECO Compact Evaporators
Unit Evaporator Selection
The capacities of the unit cooler were tested in compliance to EN 328 standard with R22 according to SC2 testing
conditions (Tab 1).
To select the product in conditions of practical use with R404A, it is necessary to multiply the nominal capacity value by the
correction factor stated in Tab 2.
With R134a and R22 refrigerants multiply the nominal capacity by the respective factor (Tab 3).
Selection examples
A) for a CTE model based on required heat load
- Heat load = 2kw
- Room temperature = -25ºC
- TD = 7K
- Refrigerant = R134a
- Selected model = CTE 41 M6
CT 2
= Capacity = = 2,37kW = CTE 41 M6
F1x F2 0,936 x 0,91
B) for a CTE model based on different conditions
- Room temperature = -25ºC
- TD = 7K
- Refrigerant = R22
- Selected model = CTE 125 L8ED
Nominal capacity x F1 x F2 = 7,08 x 0,769 x 0,95 = 5,17kW
in which:
CT = Heat load
F1 = Correction factor of nominal capacity (Tab 2)
F2 = Correction factor for refrigerants (Tab 3)
Tab 1 - STD conditions in compliance to EN 328 standard
Standard capacity Inlet air Evaporation RH% Wet conditions
conditions temperature ºC temperature ºC factor
SC1 10 0 85 1,35
SC2 0 -8 85 1,15
SC3 -18 -25 95 1,05
SC4 -25 -31 95 1,01
Tab 2 - F1 correction factor of nominal capacity kW(R404A) for different room temperatures and TD
³ T [K] 1
10 1.087 1.087 1.099 1.129 1.159 1.190 1.220 1.250 1.293 1.337 1.380 1.424 1.467 1.467 1.467 1.467 1.467
9 0.978 0.978 0.989 1.016 1.043 1.071 1.098 1.125 1.164 1.203 1.242 1.282 1.321 1.321 1.321 1.321 1.321
8 0.870 0.870 0.879 0.903 0.928 0.952 0.976 1.000 1.035 1.070 1.104 1.139 1.174 1.174 1.174 1.174 1.174
7 0.761 0.761 0.769 0.790 0.812 0.833 0.854 0.875 0.905 0.936 0.966 0.997 1.027 1.027 1.027 1.027 1.027
6 0.652 0.652 0.659 0.678 0.696 0.714 0.732 0.750 0.776 0.802 0.828 0.854 0.880 0.880 0.880 0.880 0.880
5 0.543 0.543 0.550 0.565 0.580 0.595 0.610 0.625 0.647 0.668 0.690 0.712 0.734 0.734 0.734 0.734 0.734
4 0.435 0.435 0.440 0.452 0.464 0.476 0.488 0.500 0.517 0.535 0.552 0.570 0.587 0.587 0.587 0.587 0.587
ºC2 -35 -30 -25 -20 -15 -10 -5 0 1 2 3 4 5 6 8 10 12
Tab 3 - F2 correction factor for refrigerants
T. room (ºC)
-35 -30 -25 -20 -15 -10 -5 0 1 2 3 4 5 6 8 10 12
R22 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95
R134a - - - - 0.86 0.88 0.89 0.91 0.91 0.91 0.92 0.92 0.92 0.92 0.93 0.93 0.93
R507 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1
Temperature difference between evaporator air entering temp. and the refrigerant evaporating temp.
3
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