Giovanni Bonesso, Sales & Marketing Humidification Product Specialist and Federico Ferrari, Sales & Marketing Refrigeration Application Specialist at ATMO Virtual Trade Show 2021. Increasingly high summer temperature peaks impact condenser and gas cooler performance. Evaporative cooling is an effective solution to give new life to installed coils, increasing their efficiency and reliability, or reducing coil size for new installations. This webinar presents chillBoster, with the focus on the benefits it brings to food retail refrigeration systems. Know more: natref.carel.com

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chillBooster
Increasing CO2 gas cooler
efficiency and safety
Giovanni Bonesso
Federico Ferrari
30/03/2021

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Natural refrigerants in
commercial refrigeration
Racks Cabinets Semi plug-in
Food Service
IoT service Natural refrigerants

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Summary
• HVAC/R applications
• Ambient temperature influence on gas cooler
• Solution overview
chillBooster system
Water quality
Installation examples
• Experimental data

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Gas cooler
Heat rejection:
naturally related to
ambient temperature
Keeps the
temperature
setpoint
Chiller
HVAC for industrial and
commercial applications

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Evaporators
Compressor
rack
Gas cooler
Heat rejection: naturally related to
ambient temperature
Refrigeration: stable setpoint,
medium or low temperature
Keeps the pressure suction
setpoint, makes the refrigerant flow
Refrigeration for food retail

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Struggles in
delivering cold
during summer
hot peaks
Lower
efficiency for
transcritical CO2
compared to
subcritical
Exchanger
oversize for only
few hot hours
during the year
Decreased
capacity in heat
exchanger
CO2 critical temperature 31 °C/88 °F
With outdoor air ≥ 31 °C no CO2 condensation 🡪 gas
cooling:
• The cycle becomes trans-critical (TC) = above the critical
temperature
• CO2 remains a gas after the condenser: an additional valve and
additional energy are required to turn it into liquid form and to
run the cycle
With outdoor air temperature ≤ 25 °C/77 °F it is possible to
keep sub-critical conditions
• Less energy is required to run the refrigeration cycle
Ambient temperature influence

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The solution:

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The pumping station
Motor
Pump
UV Lamp
(Optional)
Fill Valve
Drain Valve
Water inlet
Water outlet

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The distribution system
Manifolds
Nozzles and caps
Drain valves

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Water quality
Tap water Demineralized water

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Water quality: our proposal

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Installation examples
On field Carel proposal

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Installation examples
On field
Carel proposal

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Installation examples - W shaped
On field
Carel proposal

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Complete CO2 management
Optimal gas cooler pressure, FGV management, heat recovery
Easy to use
with a user friendly display and wizard procedure
Dedicated integration with chillBooster
gas cooler functions to maximize the benefits of evaporative cooling:
high pressure prevent, longer subcritical status
pRack: full rack control for CO2

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Working logic
Reduce load during temperature peaks Reduce the overall working pressure
Decrease temperature during rare hot hours
🡪 avoid oversize of the heat exchanger
Lower working pressure means less work for the compressors
🡪 energy saving

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Study: field data
*Source:
Impact of a Warming Climate
on UK Food Retail Refrigeration
Systems: Recommendations for
Industry, Imperial College
and Sainsbury’s
chillBooster has been teste in our labs with a gas cooler
combined with a CO2 rack
🡪 Effective increase in efficiency
🡪 The energy saving increase with the increase of ambient
temperature
+8/12%*
System
efficiency

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Visit
Natref.carel.com