HVAC Chiller Systems for Commercial Buildings
GESON designs and manufactures air-cooled and water-cooled HVAC chiller systems for commercial and institutional cooling projects. Each selection is based on the building cooling load, chilled-water temperatures, flow, climate, operating profile, heat-rejection method, power supply and project location.
A complete proposal states the selected model, rated cooling capacity and power at defined conditions, compressor and heat-exchanger configuration, controls, supply scope and installation requirements. Capacity, efficiency and refrigerant suitability are not quoted without the corresponding design conditions.
HVAC Chiller Selection Starts With Rated Conditions
For accurate selection, send the application, design cooling load, chilled-water supply and return temperatures, flow, outdoor design temperature, condenser-water conditions where applicable, operating hours, redundancy requirement, power supply and destination country.
Air-Cooled HVAC Chillers
Air-cooled systems reject heat directly to outdoor air and avoid a cooling tower. Outdoor design temperature, installation clearance, sound limits, coil protection and part-load operation must be reviewed.
Water-Cooled HVAC Chillers
Water-cooled systems use a condenser-water loop and cooling tower. Selection requires condenser-water entering and leaving temperatures, flow, local wet-bulb conditions and a water-treatment plan.
Plant-Level Engineering
The chiller is one part of the system. Pumps, AHUs or FCUs, piping, expansion and pressurization, controls, heat rejection and water quality all affect performance and reliability.
Confirmed GESON Supply and Service Scope
- New R454B chillers: available subject to model, rated conditions, destination regulations, safety requirements and written confirmation.
- New R513A chillers: available subject to model, rated conditions, destination regulations and written confirmation.
- Legacy GESON R22 equipment: spare-parts and refrigerant-related service support is available subject to the original model, equipment condition, local regulations, qualified technician requirements and written confirmation.
Controls, Electrical Supply and Site Conditions
Provide the required control sequence, staging logic, monitoring points, BMS communication requirements, voltage, phase, frequency, maximum ambient temperature, altitude, indoor or outdoor location, corrosion exposure, sound restrictions and available installation space. Available interfaces and protocol scope are confirmed for the selected control package.
Heat Exchangers, Water Quality and Site Scope
Heat-exchanger construction and design pressure must match the selected unit and project. Water quality, filtration, fouling allowance, freeze protection and maintenance access should be defined before ordering. The quotation identifies which pumps, tanks, cooling towers, valves, sensors, starters, controls and commissioning services are factory supplied or site supplied.
How an HVAC Chiller Plant Works
An HVAC chiller removes heat from a circulating chilled-water loop. Pumps distribute chilled water to air-handling units or fan-coil units, where it cools and dehumidifies building air. The chiller then rejects that heat through an air-cooled condenser or a condenser-water and cooling-tower loop.
Air-Cooled vs Water-Cooled HVAC Chillers
| Selection factor | Air-cooled system | Water-cooled system |
|---|---|---|
| Heat rejection | Outdoor air across condenser coils | Condenser-water loop and cooling tower |
| Key design input | Outdoor dry-bulb temperature and airflow clearance | Condenser-water temperatures, flow and outdoor wet-bulb condition |
| Site infrastructure | No cooling tower or condenser-water pump | Requires tower, pumps, piping and water treatment |
| Engineering focus | High-ambient operation, sound, coil condition and fan staging | Tower approach, water quality, fouling, pumping and plant controls |
Information Required for HVAC Chiller Selection
- Building type, location and design cooling load or load calculation
- Required chilled-water supply and return temperatures
- Design chilled-water flow and allowable pressure drop
- Outdoor design dry-bulb; wet-bulb and condenser-water conditions for water-cooled plants
- Daily and seasonal load profile, operating hours and redundancy strategy
- Water or glycol type and concentration where freeze protection is required
- Power supply, BMS points or protocol, sound limit and installation constraints
- Destination country and applicable project codes or documentation requirements
Full-Load, Part-Load and Whole-Plant Efficiency
Commercial buildings rarely operate at peak load continuously. Review both full-load performance and the expected part-load profile. For water-cooled plants, compare the combined energy of chillers, chilled-water pumps, condenser-water pumps and cooling-tower fans—not only the chiller compressor.
HVAC Chiller FAQ
What is the difference between an HVAC chiller and a process chiller?
An HVAC chiller primarily serves building comfort cooling through AHUs or FCUs. A process chiller controls equipment or product temperature. The selection conditions, temperature stability, operating schedule, fluid and redundancy requirements can therefore be different.
Can GESON supply new chillers using R454B or R513A?
Yes. New R454B and R513A chiller selections are available. The final refrigerant and configuration are confirmed by model, rated conditions, destination regulations, safety requirements and written proposal.
Can GESON support old GESON R22 chillers?
Yes. GESON can provide spare-parts and refrigerant-related service support for legacy GESON R22 equipment, subject to the original model, equipment condition, local regulations, qualified service requirements and written confirmation.
What rated conditions should appear in a chiller quotation?
The quotation should identify chilled-water entering and leaving temperatures, flow or fluid data, outdoor ambient for air-cooled units or condenser-water conditions for water-cooled units, and the resulting cooling capacity and input power.
How should a commercial building chiller be sized?
Use a project load calculation and load profile rather than floor area alone. Then check temperature, flow, climate, diversity, redundancy, future load and operating strategy with the mechanical engineer.
What should I send to request a selection?
Send the application, load, chilled-water temperatures, flow, climate, fluid or glycol concentration, power supply, operating schedule, redundancy, BMS requirements and destination country.
Engineering References