24
NRL 028-075 60Hz
EN
The heating capacity that can be obtained from the
desuperheater is found by multiplying the nominal value
(Pd), by a relative co-efficient (Cd).
The following diagrams allow to obtain corrective
co-efficients to use for chillers in their various versions;
external air temperature, to which reference is made, is
shown in correspondence to each curve.
In heat pump models the desuperheater must be shut-
off in heat pump mode, or the warranty will be come
void..
PRESSURE DROPS
The NRL models with desuperheater have 2 desuperhe-
aters for all sizes (positioned in parallel).
NOTE
Desuperheater features and pressure drop curves are
shown below.
For temperature values of produced water, different
from 50°C - 122°F, multiply the result by the corrective
factor.
Nominal value referring to:
Air temperature
35°C / 95°F
Water at the desuperheater
45/50°C / 104/122°F
∆t
5°C / 41°F
Units with Desuperheater (D) do not envision the
following versions:
YD
XD (only for temperature under 4°C / 39,2°F)
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 68°F
95
100
105
110
115
120
125
130
135
140
145
149
113°F
104°F
95°F
86°F
77°F
Temperature of water produced at the desuperheater ∆t 5°C - 41°F
Corr
ectiv
e c
o-e
fficien
ts Cd
DESUPERHEATER CORRECTIVE COEFFICIENTS
Average water temperature °C/°F 30/86 40/104 50/122 60/144 70/158
Multiplicative co-efficients
1,04
1,02
1
0,98
0,96
11. DESUPERHEATER
1
0280-0300-0330
2
0350-0500-0550-0600
3
0650-0700-0750
DESUPERHEATER PRESSURE DROP
0
0
20
40
60
80
100
120
140
160
0
5
23
20
15
10
kPa
psi
5000
10000
15000
20000
l/h
88
0
20
30
10
40
50
60
70
80
gpm
1
2
3
Pressure drop corrections on variation of the average water temperature.