AK-LM 350
RS8GX102 © Danfoss 10-2013
53
COP calculation
The function calculates the COP based on the read-
ings received, and it compares the data with the
theoretically ideal situation.
• COP Plant type
You can choose between the following 5 types
of systems:
- 744 booster
- 744 booster with heat recovery
- 744 booster with heat recovery and brine
- Cascade plant
- Single plant
• Calculation method
- Power calculation (requires signal from
energy meters)
- Circulation (swept volume)
• Start calculation
• Sensors
There must be a signal from the sensors listed.
• Pressure transmitters
There must be a signal from the sensors listed.
• Act. cutin compressor capacity
A voltage signal must be received from the com-
pressor control. The signal indicates the percent-
age of connected compressor capacity.
• Swept volume
Record the total volume flow of the current com-
pressor group in m3/second.
• Power meter
Define the connection point if the calculation is
to be made via power measurement.
• Refrigerant
Set the refrigerant to CO2 for the three types of
systems. Set the current refrigerant for the two
other systems.
The following refrigerants are possible:
R134a
R170
R290
R404A
R407C
R410A
R507
R600a
R717
R744
R1270
• Heat recovery and 3-ways valves
Define both sensors if there is heat recovery for
both utility water and room heating. If only one
of the two heat recovery units is used, leave out
the sensor setting for the second.
The controller must know if the valve is sending
gas through the heat exchanger, or if the gas is
bypassing it. This should be done with an on/off
signal.
COP calculation
Configuration - continued
In our example we select the settings
shown.
The example constitutes a booster system
with heat recovery. It requires signals from
all of the sensors displayed.
The sensor name in the blue fields comes
from the “I/O configuration”. The data in pa-
rentheses is only for orientation and can be
dispensed with.
S1 to S8 are temperature sensors; P1 to P5
are pressure transmitters; DI1 to DI2 are on/
off signals; and the compressor capacity
consists of voltage signals V1 and V2.
In chapter 6, there are drawing examples of
the required COP signals for the various types
of systems.