Designing CO2 systems for high ambient temperatures in the most energy and cost efficient way is a challenge often discussed by HVAC experts. With its chillBooster air cooling system, CAREL has created a solution that actively contributes to the cooling process and increases the booster effect. chillBooster has successfully been applied at a Carrefour store in Istanbul this year, with data being collected for a detailed analysis and future improvements of similar systems.
The energy efficiency of CO2 systems is greatly improved when the outdoor-air temperature is below 15 °C / 59 °F (approx.), which allows gas coolers to maintain the CO2 well inside the subcritical region. When the outdoor air is warmer, evaporative cooling can be used to make it colder in an efficient and environmentally friendly way.
Increased heat rejection of 40%
CAREL’s chillBooster is a water atomiser that sprays 35-µm drops of water towards the coils of a gas cooler. In general, it can be also used for dry coolers and chillers. The drops are usually sprayed against the air flow so that they partially evaporate before depositing on coils: the evaporation in the air takes place by absorbing heat from the air, reducing its temperature. Then, most of the non-evaporated water deposits and evaporates from the coils, greatly enhancing the rejection of heat from the chiller. The part of the water that does not evaporate drips by bringing away some more heat.
“The chillBooster features can increase the heat rejected by the chiller by even 40% or more,” says Michael Englebright, Global Key Accounts Manager for Retail Solutions at CAREL.
“The enhancement of the heat rejection is equivalent to operating the gas cooler with dry coils and outdoor air even 10+ °C (18+ °F) colder than the actual temperature,” he adds.
Main features of chillBooster
About CAREL
Carel has been working in the field of refrigeration, air conditioning and humidity control since 1973. Carel solutions are specifically conceived for the management of chillers, compressor packs, showcases, multiplexed cabinets, cold storage rooms, seasoning rooms, retarders, air handling units, roof-top units and air-conditioning units in general, and are utilised world-wide, both by the most well-known OEMs and by the most demanding installers in the HVAC/R market.
The company has an international reputation (over 70% of total sales are made abroad), and operates directly through 13 sales subsidiaries (France, Great Britain, Germany, Spain, Australia, Asia (HK), Brazil, China, South Korea, India, Russia, South Africa and USA), production plants in Italy, Brazil, China and the US and a commercial network in over 70 different countries around the world.
Increased heat rejection of 40%
CAREL’s chillBooster is a water atomiser that sprays 35-µm drops of water towards the coils of a gas cooler. In general, it can be also used for dry coolers and chillers. The drops are usually sprayed against the air flow so that they partially evaporate before depositing on coils: the evaporation in the air takes place by absorbing heat from the air, reducing its temperature. Then, most of the non-evaporated water deposits and evaporates from the coils, greatly enhancing the rejection of heat from the chiller. The part of the water that does not evaporate drips by bringing away some more heat.
“The chillBooster features can increase the heat rejected by the chiller by even 40% or more,” says Michael Englebright, Global Key Accounts Manager for Retail Solutions at CAREL.
“The enhancement of the heat rejection is equivalent to operating the gas cooler with dry coils and outdoor air even 10+ °C (18+ °F) colder than the actual temperature,” he adds.
Main features of chillBooster
- Adiabatic air cooling system for use on chillers and drycoolers and for most air-conditioning and refrigeration applications.
- The atomised water cools the coil by a flow of colder air and droplets of water, allowing more favourable operating conditions
- The droplets that evaporate from the surface of the fins actively contribute to the cooling process, increasing the booster effect
- This allows liquid coolers and condensers to deliver their rated capacity even during the hotter periods of the year, which often coincide with operation at maximum load
- No costly system oversizing
About CAREL
Carel has been working in the field of refrigeration, air conditioning and humidity control since 1973. Carel solutions are specifically conceived for the management of chillers, compressor packs, showcases, multiplexed cabinets, cold storage rooms, seasoning rooms, retarders, air handling units, roof-top units and air-conditioning units in general, and are utilised world-wide, both by the most well-known OEMs and by the most demanding installers in the HVAC/R market.
The company has an international reputation (over 70% of total sales are made abroad), and operates directly through 13 sales subsidiaries (France, Great Britain, Germany, Spain, Australia, Asia (HK), Brazil, China, South Korea, India, Russia, South Africa and USA), production plants in Italy, Brazil, China and the US and a commercial network in over 70 different countries around the world.
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Oct 25, 2012, 19:09
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