4. Integration
Complete control of the entire unit on one
single device
• Lower installation costs/ space
• Increased usability (one point of access)
• Faster commissioning
• Improved efficiency
5. How to divide total energy consumption between REF – AC – HR?
Compressor power consumption [kW]
• PMT : Medium temperature compressors
• PLT : Low temperature compressors
• PPC : Parallel compressors
• PGC : Gas cooler
Integration
Heat transfer
• QAC : Air conditioning heat
• QHR : Heat recovery heat
One unit providing REF+AC+HR
6. PHR
PAC
PREF
PGCPPCPLTPMT
QAC
Rack Controller
QHR
How to divide total energy consumption between REF – AC – HR?
Site status reading: main variables, energy consumption, heat transfer
Real time COP calculation, division of power consumption
Integration
8. PARALLEL COMPRESSOR
Receiver pressure control
Activated with sufficient flash gas
Flash gas valve synchronisation
Higher efficiency
• High gas cooler pressure
• AC load
• Heat recovery
Higher efficiency at higher outside temperature
RPRV
HPV
Warm Climates
9. 00
10
20
30
40
50
60
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
PowerConsumption[kW]
Outside temperature [°C]
Power consumption vs Temperature
Booster with Flash Valve Booster with Parallel compressor
Parallel compressor
enabled to run only when
outside temperature higher
than 15°C
Warm Climates
-15%