280 300 330 360
Heat capacity recovered kW 282 316 345 375
Desuperheater water flow rate l/h 48430 54340 59420 64500
Desuperheater pressure drops kPa 20.8 28.3 30.3 38.5
15. DESUPERHEATER
The heating capacity that can be
obtained from the desuperheater is
obtained by multiplying the nominal
value (Pd) shown in table
15.1.1 by a
suitable coefficient (Cd).
The diagrams will give you the correction
coefficients to be used for the chillers in
the various versions; next to each curve
you can see the outside air temperature
to which it refers.
In the heat pump versions, the
desuperheater must be intercepted
during heat pump operation: otherwise,
the guarantee will no longer be
considered valid
.
15.1. PRESSURE DROPS
The NRL models with desuperheater, from
size 2800 to 3600, have 4 desuperheaters
(placed in parallel 2 to 2).
NB:
the characteristics of the desuperheaters
and the pressure drop curves are shown
below.
For processed water temperatures
different from 50°C, the result obtained
is multiplied by the correction factor that
can be obtained from Table 15.1.2.
Processed water temperature at the desuperheater (∆t 5°C)
Cd correction coefficient
45°C
40°C
35°C
30°C
25°C
0.00
35 40 45 50 55 60 65
0.50
1.00
1.50
2.00
2.50
3.00
20°C
DESUPERHEATER CORRECTION COEFFICIENTS
0
20
40
60
80
100
120
140
160
180
200
20000 30000 40000 50000 60000 70000 80000 90000 100000 110000 120000
Portata acqua [l/h]
Perdita di carico totale [kPa]
2
800
3
000
3
30
0
36
00
DESUPERHEATER PRESSURE DROPS
NOTES:
The units with desuperheater (D)
not for versions:
− YD
− XD (only for temperatures lower than 4°C)
Average water temperature °C 30 40 50 60 70
Multiplication coefficient
1.04 1.02 1 0.98 0.96
The nominal value refers to:
− air temperature 35°C
− water at the desuperheate 45/50°C
− ∆t 5°C
15.1.1. NRL (D)
15.1.2. Correction of pressure drop when
average water temperature varies.
27
INRLPY. 02.10 4086916_01
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