Matteo Dal Corso's speech on transcritical CO2 single & multi DC racks, given during Chillventa 2018.

1. 1
Hall 9
NürnbergMesse, Arbeitstitel, Datum
Chillventa Specialist Forums 2018
Chillventa Fachforen 2018

2. Matteo Dal Corso
10/2018
Transcritical CO2 single &
multi DC racks

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Continuous modulation for CO2 systems
Latest innovation to further spread out CO2 technologies
Main targets:
 CO2 available in all formats
 Energy efficiency improvements (warm climates)
 Extremely wide modulation range with DC tech.
 Ease of use
 Total connectivity
Small-medium formats
New focus of natural efficiency deployment

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HypermarketSupermarketSmall formatsC-Store
Technologies for all formats
Market size versus Application

5. This document and all of its contents are property of CAREL. All unauthorised use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL, is severely forbidden. All data refer to year 2017
Future proof technology
Efficiency in ALL conditions
 Increased efficiency at partial load
 Wide capacity modulation
 Reduced ON/OFF cycles: the refrigeration circuit
needs time to reach the nominal efficiency
 A refrigeration application is working for the
largest part of the time at partial load
DC technology Permanent magnets variable speed
compressors driven by intelligent DC
drivers (inverters)
Advanced DC drivers modulation
 Focused on compressor protection
& control
 Optimized for a wide range of BLDC
compressors
 Designed for smart integration in
the unit
 Class B software (EN 60730-1):
embedded compressor protection
 Unit protection saving additional
components

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0,00
0,40
0,80
1,20
1,60
2,00
0% 20% 40% 60% 80% 100%
COP
Cooling Load
DC*
AC*
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
50,00 60,00 70,00 80,00 90,00 100,00 110,00
COP
HP [bar]
AC*
DC*
Lab test data
DC Vs AC Compressor comparison
*semi-hermetic reciprocating 2 pistons with AC speed drive
Cooling capacity MT (-10 °C, 50 Hz):
- 2,4 kW (100 bar)
- 3,4 kW (66 bar)
* DC Single Rotary Brush Less with DC speed drive
Cooling capacity MT (-10 °C, 60 rps):
- 2,1 kW (100 bar)
- 2,7 kW (66 bar)
 Higher efficiency in every load condition
 Wider modulation range
 Higher maximum speed (up to 100rps)
Lab test data

7. This document and all of its contents are property of CAREL. All unauthorised use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL, is severely forbidden. All data refer to year 2017
DC Transcritical Condensing Units
New frontier in efficiancy
 High efficiency DC inverter compressors for CO2
 Wide and real capacity modulation
 Self-optimization through real time communication
with refrigerated units
Total connectivity
 Total connection with Carel supervisory systems and IOT
services
 Performance monitoring and full settings management
 Periodical reports and stores benchmarking
System benefits

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Increased reliability
 Full compressor’s envelope control
 No system down-time for oil return issues
 Stable product temperature thanks to modulating
devices and floating setpoints
System benefits
DC Transcritical Condensing Units
Ease of use
 System solution in compact, fully-integrated equipment
 Intuitive programming and fast commissioning tools
 Compact dimensions and weight
MT unit
LT unit

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Multi DC Racks
Multiple parallel DC compressors
System benefits
Efficiency without compromise
 High energy efficiency with multiple DC
compressors modulation
 Extremely wide modulation range 5-100%
 Wider system modularity
Overall compactness and silence
 Unit compact design
 Low weight, easier to carry
 Low noise solution

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Perfect for retrofits and shops downtown
 Suitable for the installation inside the store
 NarRef CO2 application to retrofit outdated HFC store
 Complete solution for express stores in the city centre
Multi DC Racks
Multiple parallel DC compressors
System benefits
Ease of use and reliability
 Intuitive programming and fast commissioning tools
 Specifically designed oil equalisation and distribution features
 Enhanced safeties: full envelope control and oil return functions

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Main DC technology applications
Condensing unit Multi DC Racks

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16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
AC driven rack
DC driven rack
External
Temp. [°C]
DC vs AC
saving [%]
20 +13%
21 +14%
22 +15%
23 +13%
24 +14%
25 +15%
26 +16%
27 +15%
28 +12%
29 +12%
30 +14%
31 +10%
Energy consumption observed during 2018
External temperature from 16 to 39°C
Advansors pack real field data
Booster systems with DC compressors Vs standard AC solution
Multi DC Racks
DC Vs AC field data comparison

13. This document and all of its contents are property of CAREL. All unauthorised use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL, is severely forbidden. All data refer to year 2017
 Efficiency: continuous modulation to maximize energy efficiency in all climates and in all formats
 Performance: optimum control of modulating devices to enhance system stability and food quality
 Reliability: reduced compressors cycling and safe envelope management
 Cost effectiveness: reducing system and components complexity to decrease return of investments
 Availability for small&medium formats
Conclusions

14. This document and all of its contents are property of CAREL. All unauthorised use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL, is severely forbidden. All data refer to year 2017

15. This document and all of its contents are property of CAREL. All unauthorised use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL, is severely forbidden. All data refer to year 2017

16. 16
Hall 9
NürnbergMesse, Arbeitstitel, Datum
Chillventa Specialist Forums 2018
Chillventa Fachforen 2018