Rafael Navarro Torua, Casa Ley & Ignacio Chaparro, Kysor Warren

2. Mexico's First CO2 Transcritical
Supermarket System
Casa Ley
Rafael Navarro – Casa Ley
Ignacio Chaparro – Kysor Warren

3. • Casa Ley Sendero Culiacan
• Location
– Culiacán, Sinaloa MX
• Store Size
– 75,400 sq. ft.
• Cooling load
– 77,000 Btu/h LT @ -20F
– 444,000 Btu/h MT @ +20F
3
Store

4. • CO2 Transcritical Booster System
– Gas cooler – Adiabatic, Guntner
• Compressor Rack – Kysor Warren
– Compressors 2 x 3 – Bitzer
– Controller – Danfoss
• Display Cases – Kysor Warren
System Configuration

5. • High Pressure Components (120 Bar)
– High pressure cooper
– Stainless Steel as alternative
• Refrigerant
– CO2 Availability and cost
• Technicians for CO2 systems
– Training: System Design, Safety, Installation, Maintenance and
Equipment Operation.
5
Implementation Challenges

6. Concept CO2 HFC Difference
Estimated energy
consumption [kW/año]
510,969 545,648 6.8%
Refrigerant Charge [lb] 925 1760 47.4%
6
Energy consumption estimation and refrigerant charge

7. Concept CO2 HFC Difference
Direct Emissions
[CO2 metric tons]
1.0 7,798 99.98 %
Indirect Emissions
[CO2 metric tons]
2,660 2,874 7.4%
Total Emissions
[CO2 metric tons]
2,661 10,672 75%
7
TEWI Analysis
INDIRECT EMISSIONSTEWI DIRECT EMISSIONS

8. 8
0.00
10,000.00
20,000.00
30,000.00
40,000.00
50,000.00
60,000.00
70,000.00
EnergyConsumption[kWh]
CO2 TCB vs HFC
Sendero Culiacan [kWh] HFC [kWh]
• 6.8 % Energy savings
projected per year of
operation

9. 9
Installation and Maintenance
• 10% increase installation cost
Maintenance:
• Similar cost to HFC systems
• Cleaning Gas cooler pads – additional
0%
20%
40%
60%
80%
100%
120%
CO2 HFC