Co 2 the natural refrigerant for mt and lt in discounters supermarkets and hypermarkets
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CO 2 – the natural refrigerant for MT and LT in discounters, supermarkets and hypermarkets. October 19, 2009 Bernd Heinbokel. AGENDA. Comparison of refrigerants Overview on subcritical LT cascade systems Overview on transcritical MT systems

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Co 2 the natural refrigerant for mt and lt in discounters supermarkets and hypermarkets

CO2 – the natural refrigerant for MT and LT in discounters, supermarkets and hypermarkets

October 19, 2009Bernd Heinbokel


Agenda

AGENDA

Comparison of refrigerants

Overview on subcritical LT cascade systems

Overview on transcritical MT systems

Comparison of energy efficiency

Conclusion


Refrigerant overview

REFRIGERANT OVERVIEW

EU, Mobile air conditioning:

2011: Ban in new car types

2017: Ban in all new cars


Hfo1234yf and hfo1234ze are

HFO1234yf AND HFO1234ze ARE … ???

Flammability according EC Directives

67/548/EEC, safety data sheet:

Extremely flammable R12, F+

Use only in explosion proof systems

and areas

Expected classification according

DIN EN 378:2008 due to published data:

Low flammability, not toxic, safety class A2 Charge limitation Use in multi compressor units with direct expansion would

not be possible!


Why co 2 as refrigerant co 2 r744 is

WHY CO2 AS REFRIGERANT?CO2 (R744) is ...

A natural substance

A by-product of the air separation process A climate neutral refrigerant

No ozone depletion potential

No disposal necessary

Classified as non-toxic

As carbonic acid contained in many beverages

Cost effective and worldwide available


Why co 2 as refrigerant co 2 r744 is1

WHY CO2 AS REFRIGERANT?CO2 (R744) is ...

A good heat transfer fluid4 to 6 times higher volumetric efficiency

Designed for the futureNo taxes on GWPNo filling charge limitation

Best in class refrigerant for heat reclaim


Why co 2 as refrigerant

WHY CO2 AS REFRIGERANT?

Heat reclaim in MT-multi compressor systems

Refrigerating capacity 100kW, to=-10°C, CO2=-8°C, superheat 8K, sub cooling 5K

Desuperheating to 30°C, tap water approx. 25-50°C

CO2-subcritical: approx. 3 times higher heat reclaim capacity to heat-up tap water compared to R404A or R134a


Why natural refrigerants tewi comparison for the supermarket format

WHY NATURAL REFRIGERANTS?TEWI comparison for the supermarket format

Data according German climate conditions


Why natural refrigerants c o 2 in comparison to r404a

WHY NATURAL REFRIGERANTS?CO2 in comparison to R404A

~10% savings in energy consumption

* Car with 0,12kg CO2/km ; 15.000 km per year

Average savings in North-Europe / Leakage rates: Hyper 15%, Super 12%, Discount 8%


Timeline and outlook in the retail business

TIMELINE AND OUTLOOKin the retail business

Standardised CO2-LT-cascade

LT

Pilot phase

First market installation


Systems for lt subcritical in cascade to mt or as booster

SYSTEMS FOR LTSubcritical in cascade to MT or as Booster

CO2-LT got standard for example in:Scandinavian countries, Switzerland Several German retailer chains

5.600 kW LT-refrigerating capacity in 170 stores


Timeline and outlook in the retail business1

TIMELINE AND OUTLOOKin the retail business


Dx systems for medium temperature transcritical

DX-SYSTEMS For medium temperature, transcritical

Norway 9 stores

Sweden1 store

Denmark28 stores

UK3 stores

Germany24 stores

Netherlands1 store

Czech Republic2 stores

Hungary1 store

Luxembourg1 store

Austria1 store

Switzerland19 stores

12.000 kW refrigerating capacity in 90 stores,additional 20 stores ordered


Risks by high pressure level

RISKS BY HIGH PRESSURE LEVEL

Pressure multiplied by volume as parameter for risk by overpressure is not higher than in R4040A- or R134a-DX-systems, while having significantly lower filling charges.


Co 2 direct expansion for mt and lt refrigeration

CO2 – DIRECT EXPANSION For MT- and LT refrigeration

Booster

Cascade

Higher energy efficiency

Smaller rack footprint

Lower installation costs


Comparison of energy efficiency r404a r134a and co2 dx in mt supermarket application

COMPARISON OF ENERGY EFFICIENCY R404A, R134a and CO2-DX in MT-supermarket application

Design condition

Annual average temp.

tA Ambient temperature [°C]

Annual hours [h]

CO2 is efficient in Supermarket refrigeration at average ambient temperatures

CO2

Carrier has the right refrigerant solution for every application, but every application will not have the same refrigerant solution.”

Attractive energy savings can be obtained with average annual temperatures up to 15 °C.

For example: Stockholm 7 °C, Brussels 10 °C,Paris 12 °C, Milan 13 °C, Madrid 14 °C

R404A

R134a

R134a is efficient in air conditioning at high ambient temperatures

Good COP

Average COP

Bad COP


Rac awards 2008

RAC AWARDS 2008

An award organized by the British refrigeration and air conditioning magazine rac


Multi compressor racks coop wettingen switzerland

MULTI COMPRESSOR RACKS Coop Wettingen, Switzerland

  • MT-Rack LT-Rack MT-Rack Qo: 160 kW Qo: 50 kW Qo: 160 kW

With heat reclaim for hot water and space heating With LDS controller systemCommissioning 11/2004


Multi compressor rack lt booster

MULTI COMPRESSOR RACKLT-Booster

tegut… Lorsch (KK 03-2009)

MT Qo: 70 kW

LT Qo: 20 kW

Frequency controlled compressors

Heat reclaim for tap water

LDS controllers


Sales area mt products tegut lorsch kk 03 2009

SALES AREA MT-PRODUCTSTegut… Lorsch (KK 03-2009)


Mt rack with lt booster rack edeka center h vener wuppertal

MT-RACK WITH LT-BOOSTER RACK EDEKA Center Hövener Wuppertal

KI 07/08-2009:

Carrier Commercial Refrigeration

and Edeka Hövener

take 75 to 100 cars off the road


Sales area edeka center h vener wuppertal

SALES AREA EDEKA Center Hövener Wuppertal


Conclusion dx systems for mt lt refrigeration

CONCLUSIONDX-systems for MT-/LT-refrigeration

Indirect Emissions

Direct Emissions

TEWI

Avoidance of direct emissions by:

Use of the natural refrigerant CO2 with GWP=1

Reduction of indirect emissions by:

Energy efficiency gains of CO2

in direct expansion with

average annual temperatures up to 15 °C


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