GESON / AIR-COOLED SCREW CHILLERS
OUTDOOR DRY-BULB · AIRFLOW CLEARANCE · LARGE LOAD PROFILE
Air-cooled screw chillers read the outdoor envelope.
An air-cooled screw chiller rejects heat directly to outdoor air. Selection starts with the chilled-fluid duty and continues through maximum ambient, altitude, coil environment, airflow clearance, sound requirements and the operating profile.
AIR SIDE / CORE PRINCIPLE
Reject the load
at the outdoor coil.
The evaporator transfers heat from the chilled fluid into refrigerant. A screw compressor raises refrigerant pressure and temperature, then condenser coils and fans reject the absorbed heat plus compressor input to outdoor air.
No condenser-water loop is required, but the air side is not a generic condition. Ambient dry-bulb, altitude, airflow, recirculation, coil exposure and fan control materially change the selected performance and site layout.
SITE ENVELOPE / OUTDOOR REVIEW
Make the outdoor conditions part of the equipment schedule.
The source page identifies air-cooled screw systems as a route without cooling-tower infrastructure. This review captures the site requirements that take the place of a condenser-water loop.
Design ambient
State maximum and minimum outdoor dry-bulb temperature, altitude, solar exposure and the design point used for the selection.
Airflow clearance
Confirm intake and discharge clearances, walls, screens, adjacent units, prevailing wind and any hot-air recirculation risk.
Coil environment
Dust, fibers, salt, industrial contaminants and cleaning access affect coil materials, protective options and maintenance planning.
Sound + service
Define the measurement location, site noise limit, lifting access, coil-cleaning access and required fan or acoustic options.
LOAD RESPONSE / SCREW CONTROL
Separate peak capacity from the operating profile.
Capacity-control behavior depends on the selected compressor, refrigeration circuit, control method, fluid conditions and ambient. Rather than copying a generic percentage table, compare the offered package at the project’s representative operating points.
Confirm net capacity, power and fan duty at the specified fluid and outdoor conditions.
Review performance with the actual load and climate distribution where available.
Confirm circuit count, selected control range, stable operating limits and staging sequence.
Define lead/lag, standby, BMS points and the shared hydraulic control strategy.
APPLICATION FIT / AIR-COOLED ROUTE
Use duty context to select the outdoor package.
Industrial process duty and larger chilled-water systems can use air-cooled screw configurations where cooling-tower infrastructure is undesirable. Final suitability follows the actual conditions and selected model.
Continuous process cooling
Review mould, barrel or process temperature, fluid quality, duty pattern, ambient exposure and water-side distribution.
Production line heat removal
Review hygiene requirements, process temperature, fluid separation, operating schedule, washdown exposure and service continuity.
Variable industrial load
Review equipment heat release, coolant compatibility, temperature tolerance, load steps, pump strategy and site environment.
Outdoor chilled-water plant
Review building load profile, air-handling or fan-coil temperatures, electrical service, sound criteria and the outdoor installation plan.
AIR VS WATER / PROJECT DECISION
Compare the complete plant, not a single nominal COP.
Air-cooled systems avoid condenser-water pumps, treatment and tower scope. Water-cooled systems add those systems and are evaluated around their condenser-water and heat-rejection design.
FACTORAIR-COOLED SCREWWATER-COOLED SCREW
Heat rejection
Outdoor coils and fans
Condenser-water loop and heat sink
Weather basis
Outdoor dry-bulb, altitude and airflow
Condenser-water conditions, wet-bulb and tower approach
Maintenance focus
Coils, fans, clearance and exposure
Tubes, water quality, pumps and tower
PROJECT BRIEF / AIR-SCREW QUOTATION
Send the load and the outdoor envelope together.
GESON can review the operating point and define the proposed equipment scope when fluid duty, ambient conditions, site layout and power data are provided together.
Share Project Conditions- 01
THERMAL DUTY
Application, cooling load, entering/leaving fluid temperatures, design flow, fluid or glycol concentration and temperature-control tolerance.
- 02
OUTDOOR CONDITIONS
Maximum/minimum ambient, altitude, exposure, clearance drawing, coil environment and required sound limit.
- 03
OPERATING PROFILE
Peak, typical and minimum load; hours; load changes; redundancy; expected simultaneous equipment load and future expansion.
- 04
ELECTRICAL + SCOPE
Voltage, frequency, phase, starting method, BMS points, site location, destination requirements and factory/site supply boundary.
AIR-COOLED SCREW FAQ
Questions before the outdoor system is selected.
01Does an air-cooled screw chiller need a cooling tower?+
No. Condenser fans reject heat directly to outdoor air, so a cooling tower and condenser-water loop are not required. The chilled-fluid side still needs correctly sized pumps, piping, flow protection, insulation and any required buffer volume.
02How should I select a large air-cooled screw chiller?+
State the required net capacity together with entering/leaving fluid temperatures, design flow, glycol concentration where applicable, maximum ambient, altitude, power supply and installation layout. Nominal tonnage alone is not a complete selection basis.
03Can an air-cooled screw chiller operate at high ambient?+
It can be selected only within the offered model’s operating envelope. Provide the maximum design dry-bulb, altitude and installation layout so the proposal can confirm capacity and input power at that condition.
04What maintenance does the air side require?+
Planned work normally includes condenser-coil inspection and cleaning, fan and electrical checks, airflow clearance verification, leak checks by qualified technicians and control/alarm review. The site environment and model documentation define the final intervals.
05What should I send for a quotation?+
Send the application, design load, fluid temperatures and flow, fluid or glycol data, maximum/minimum ambient, altitude, operating profile, electrical supply, sound criteria, site constraints and destination country.
MODEL-SPECIFIC PROPOSAL / GESON ENGINEERING
Start with fluid duty, ambient design and a workable outdoor layout.
Send the load, entering/leaving fluid temperatures, flow, glycol information, maximum ambient, altitude, operating profile, power supply and site constraints for an air-cooled screw selection.