Specifications
36
12.3.3 - Control configuration with the desuperheater option
This configuration allows the user to enter a setpoint that is
relative to the minimum condensing temperature (default
= 30°C) to increase the heating capacity reclaimed at the
desuperheaters, if required.
The percentage of the reclaimed heating capacity compared
with the total capacity rejected by the condenser increases
in proportion to the saturated condensing temperature.
For the control of the setpoint of the minimum saturated
condensing temperature please refet to the Pro-Dialog
control manual for the 30RB units.
Other parameters directly affecting the effective capacity
reclaimed at the desuperheater are principally:
• The unit load rates, that decide whether the unit
operates at full load (100%) or part load (depending
on the number of compressors per unit circuit).
• The water entering temperature in the desuperheater
as well as the condenser entering air temperature. See
the curve below.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
40 45 50
55
60
A
B
C
Desuperheater entering water temperature,°C
Coefficient of the reclaimed heating capacoty
A Enteringairtemperature=45°C
B Enteringairtemperature=35°C
C Enteringairtemperature=20°C
Nominal conditions corresponding to coefficient = 1
Evaporator entering/leaving temperature = 12/7°C
Desuperheater entering/leaving temperature = 50/60°C
Condenser entering air temperature = 35°C (curve B)