Two different approaches
VRF (variable refrigerant flow) systems circulate refrigerant directly to indoor units and adjust capacity zone by zone. Chiller systems produce chilled water centrally and distribute it through pipework to fan coils or air handling units.
Both are proven technologies. The right choice depends on building size, usage pattern, available plant space and how the building will be operated over its lifetime.
When VRF usually fits
VRF is often chosen for small and medium buildings, hotels with many independently controlled rooms, and refurbishments where space for plant rooms and large pipework is limited.
Heat recovery VRF can move heat between zones that need cooling and zones that need heating at the same time, which suits buildings with varied orientation and occupancy.
When a chiller usually fits
Water based systems are common in large buildings with high, concentrated loads, long pipe runs or strict limits on the amount of refrigerant inside occupied spaces.
They also integrate well with air handling units, thermal storage and central building management, and are easier to scale with additional plant.
What to define before procurement
A reliable decision starts with a load calculation, a clear description of zones and operating hours, local regulatory requirements and the maintenance model the owner intends to use.
Comparing offers on the same specification, including controls, commissioning and spare parts availability, avoids surprises during delivery and operation.