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High efficiency CO2 transcritical systems for all formats in warm climates

Diego MalimpensaApril 19th 2016

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One last barrier is limiting the full deployment of CO2 transcritical systems

Efficiency and sustainability in warm climates

Up to now several solutions has been already adoptedEvaporative cooling

Mechanical subcooling systemsParallel compression

All of these are efficient, well known and easly adoptable solution

But not able to break down definetevely yet the concept of CO2 equator

CO2 transcritical application in commercial refrigeration

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CO2 transcritical application in commercial refrigeration

What are the fundamental needs for a solution to definitevely break down the CO2equator concept

• Efficiency in warm climates

• Sustainability

• Ease of use

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Electronic Modulating Ejectors (EmJ)

Carrier CO2 refrigeration expertize met Carel controls expertize to jointlydeliver a full RANGE of MODULATING EJECTORS

• Continuos stepper modulation• Easy adaptation to all working condition and part load• Replacement of existing high pressure valve (HPV)• Different sizes to match different compressor rack capacities• Vapour ejectors design for full mass flow

• Full advanced control system (rack, cabinets, monitoring)

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Full system control

Complete management of CO2 transcritical ejector system

MT compsgas cooler

heat reclaim

flash gas valveejector

LT comps

P comps

• Direct management from main rack controller• MT and Parallel compressors switch• Real time communication with evaporators

controllers

• Built in features and safeties• Ultracap technology for safe closing in case of

power failure• Scalable controllers platform

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Transcritical CO2 system with Modulating Ejector3 working modes:

Winter : standard CO2 transcritical system, ejector asreplacement of transcritical valve, flash gas valve

Full system control

This document and all its contents are for CAREL internal use only and strictly CONFIDENTIALAll unauthorized use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL employees is severely forbidden

Transcritical CO2 system with Modulating Ejector3 working modes:

Winter : standard CO2 transcritical system, ejector asreplacement of transcritical valve, flash gas valve

Mid: standard CO2 transcritical system, ejector as replacementof transcritical valve, flash gas valve and parallel compressorssynchronization

Full system control

This document and all its contents are for CAREL internal use only and strictly CONFIDENTIALAll unauthorized use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL employees is severely forbidden

Transcritical CO2 system with Modulating Ejector3 working modes:

Winter : standard CO2 transcritical system, ejector asreplacement of transcritical valve, flash gas valve

Mid: standard CO2 transcritical system, ejector as replacementof transcritical valve, flash gas valve and parallel compressorssynchronization

Summer: Ejector mode, medium temp and parallelcompressors ALL WORKING AS PARALLELCOMPRESSORS, gas ejectors maintaning ΔP for floodedevaporators

Full system control

This document and all its contents are for CAREL internal use only and strictly CONFIDENTIALAll unauthorized use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL employees is severely forbidden

Ejector field trials (from Carrier)• Spain, France, Netherlands, Switzerland• Daily energy consumption during summer

operation @28°C outside temp• -25% MT compressor rack• -13% total refrigeration system

Real store installationFull system installation: Switzerland• 3x MT compressor• 3x LT compressor• 1x Parallel comp• 35kW ejector• HR

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Performance analysis

Efficiency in warm climate

NormalizedEnergyConsumption(AdvancedR404A)

Abs %TraditionalR404A 108 8%AdvancedR404A 100CascadeR134a/CO2 102 2%Booster 95 -5%Booster+PC 91 -9%Booster+PC+EJ 86 -14%TraditionalR404A 109 9%AdvancedR404A 100CascadeR134a/CO2 102 2%Booster 105 5%Booster+PC 97 -3%Booster+PC+EJ 87 -13%TraditionalR404A 112 12%AdvancedR404A 100CascadeR134a/CO2 103 3%Booster 109 9%Booster+PC 100 0%Booster+PC+EJ 90 -10%

Berlin

Rome

Athe

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Conceal complexity behind

Ease of management• Full optimized control SW (functions/safeties)• Scalable and customizable user interfaces• Evaporators real time synchronization (multi-master

networking TCP/IP)

Ease of use

Ease of installation and maintenance• Compact design and overall dimensions• Dismountable stator and motive noozle• Internal cleanable strainer

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• From concept to real solutions• Design validation in several countries to industrialized solutions• Scalable components according to the cooling capacity required (wide range available)• Scalable control system according the format needs

Sustainable deployment in all formats

Sustainability

From small supermarkets To big hypermarkets

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• All new technologies has to pass from ideas through concept, design, prototypes, test and industrialization phases

• Large scale availability, sustainability and ease of use are essential factors to determine a success in the market, only energy efficiency is not enough

• Innovative components can not be applied without advanced control systems that are ableto maximize efficiency and usability

• Modulating ejectors and control system, together with mechanical subcooling, parallelcompression and evaporative cooling decretate the definitive break down of the CO2equator

Conclusions

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Come to see the real demo case

This document and all its contents are for CAREL internal use only and strictly CONFIDENTIALAll unauthorized use, reproduction or distribution of this document or the information contained in it, by anyone other than CAREL employees is severely forbidden