Air Cooled Screw Chiller AirBoost 316-1449 kW Variable Speed Screw Triple Free Cooling R134a GWP 1430 R513A GWP 631 T3

If your organization has committed to net-zero targets or is facing tightening energy regulations, the AirBoost air-cooled screw chiller with triple free cooling represents the single largest annual carbon reduction available from a single equipment decision. By combining air-side free cooling, water-side free cooling, and desuperheater heat recovery, the AirBoost eliminates 30-50% of annual cooling energy consumption compared to a conventional air-cooled chiller while simultaneously eliminating boiler fuel requirements for domestic hot water.

The carbon impact is substantial and measurable. For a 1,000 kW cooling load in a temperate climate, the triple free cooling effect reduces annual electricity consumption from approximately 1,200,000 kWh to 600,000-840,000 kWh—a reduction of 360,000-600,000 kWh per year. At the global average grid emission factor of 0.4 kg CO₂/kWh, this equals 144-240 tonnes of CO₂ avoided annually per chiller, equivalent to planting 6,000-10,000 trees.

When ambient temperature drops below the chilled water setpoint, the AirBoost uses outdoor air directly through a dedicated coil. The compressor stops entirely. In temperate and continental climates (average annual temperature 10-18°C), this mode provides 100% of cooling needs for 3-5 months per year at near-zero energy cost.

• 3-5 months of zero-compressor cooling – Verifiable near-zero energy periods
• No electricity consumed – Direct Scope 2 emission reduction
• Certifiable under ISO 50001 – Documented energy reduction from free cooling
• Seasonal efficiency peaks – Dramatic quarterly energy reduction visible in utility data
• Carbon offset equivalent – Each unit avoids 144-240 tonnes CO₂ annually
• Energy cost elimination – Zero cooling energy cost during free cooling months

During transition seasons when outdoor temperature is above the chilled water setpoint but below full-load design conditions, the water-side free cooling mode provides elevated-temperature cooling at only 20-30% of full-load power consumption.

• 20-30% power consumption – Shoulder season at a fraction of full-load energy
• Extends low-energy season – Additional 2-3 months of reduced consumption
• Combined with air-side – 5-8 months of significantly reduced energy per year
• Graduated efficiency – System adapts to conditions, not all-or-nothing
• Measurable quarterly improvement – Energy reductions visible in utility bills
• Reduced peak demand – Lower demand charges during transition periods

The desuperheater captures waste heat from hot compressor discharge gas before it enters the condenser, transferring it to a domestic hot water circuit at 45-55°C. Whenever the chiller operates, free hot water is produced simultaneously.

• Free hot water whenever cooling runs – Simultaneous heating and cooling
• Eliminates boiler fuel – Direct Scope 1 emission reduction
• 12-month benefit – Heat recovery operates year-round
• Hotel/hospital impact – Domestic hot water is typically 20-30% of total energy
• Dual Scope reduction – Scope 2 (electricity) AND Scope 1 (gas) simultaneously
• Measurable ROI – Gas bill reduction often justifies the system in 2-3 years

The variable-frequency drive on the twin screw compressors provides continuous, stepless capacity modulation, adjusting motor speed to match actual demand.

• 25-35% part-load savings – vs. fixed-speed screw compressors
• Continuous modulation – No inefficient step-loading or cycling
• Soft starting – Reduced demand charges from lower peak electrical draw
• Power factor > 0.95 – Minimal reactive power, no utility penalty
• Combined annual savings of 30-50% – VSD + free cooling + heat recovery
• Predictable energy data – Consistent efficiency for accurate carbon modeling

The AirBoost offers R134a and low-GWP R513A refrigerant options, providing a clear migration path as regulations tighten.

• R513A (GWP 631) – 56% lower GWP than R134a
• Non-flammable – No special safety infrastructure needed
• Drop-in compatible – No system redesign for migration
• F-Gas compliant – Meets EU regulations through 2030+
• Quantifiable GWP data – Direct input to lifecycle carbon models
• Migration path clear – Future regulatory compliance assured

The AirBoost's BMS integration provides the granular energy data needed for carbon reporting, eliminating manual data collection and reducing reporting errors.

• Automated energy data collection – No manual meter reading
• Verified Scope 2 data – Electricity consumption for carbon calculations
• Verified Scope 1 offset – Gas savings from heat recovery documented
• CDP/GRI/TCFD audit trail – Data directly feeds into disclosure frameworks
• Error reduction – Automated data eliminates transcription errors
• Real-time carbon visibility – See carbon impact as it happens