In-Rack CW

SERVER RACK COOLING

In-Rack CW

Rack-mounted chilled water cooling doors to target data center hotspots

30 – 40 kW

Applications: Data center • Server rooms • Telecom • Government • Entertainment

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SOLUTION FOR LOCALIZED COOLING AND HOTSPOT ELIMINATION

The conventional approach to data center cooling using room-based cooling has practical limitations in high-density data centers. One solution is rack-level cooling: rack-based cooling strategy makes it possible to address high operating densities while maintaining redundancy characteristics.

For users with high-density server technologies, we offer In-Rack – a compact and lightweight chilled water cooling unit intended for attaching to the rear of rack cabinets. Since In-Rack handles the heat load as close to the source as possible, it consumes only a little amount of energy. Equipped with a set of redundancy options like hot-swappable fans, dual power supply, and uninterruptible power source, the In-Rack cooling door ensures the highest possible availability for mission-critical IT equipment.

MICROCHANNEL EVAPORATOR

The microchannel evaporator used in the In-Rack design allows achieving many advantages, including low airside pressure drops, higher cooling capacity, and noticeably less weight. Low weight removes limitations of the previous generations of rack-mounted cooling doors and enables the use of In-Rack cooling solution for both greenfield and retrofit applications.

The use of the microchannel evaporator coil reduces the overall unit depth without having to cut back on the unit’s cooling capacity. Besides, low airflow resistance of the coil results in little fan power consumption, improving In-Rack’s energy efficiency.

FEATURES

Hot-Swappable Fans
The In-Rack features hot-swap technology that allows fan replacement on running units minimizing the downtime. When the fan goes offline, the remaining fans will compensate by increasing rotation speed. 350mm axial fans mounted in bellmouth housings and equipped with EC motors allow In-Rack to efficiently operate at partial loads and optimize the overall energy efficiency.
Rack Compatibility
The In-Rack cooling door can be easily attached to any standard server rack (42U to 48U) and does not impact on the access to IT equipment installed in the cooled rack. With low weight only by 1/3 compared to competitors, the In-Rack unit does not create any significant load on the floor and rack, thus giving the customers flexibility in installation.
Installation and Startup
The unit terminal with a large touchscreen display provides advanced control and detailed run statistics and analysis for the operator. Android-based software allows configuring multiple In-Rack simultaneously by replicating the configuration and parameters onto a group of networked units, thus reducing commissioning time.
Dewpoint Control
The control hub of the In-Rack cooling unit constantly monitors the air temperature and humidity to avoid/minimize condensate build-up by regulating water flow through the evaporator coil. The system eliminates the possibility of water entry into the rack by means of dewpoint control and automatic condensate discharge system equipped with the drain pan, water sensor, and pump.
Cooling Circuit
In-Rack units are suitable for use in both constant and variable flow chilled water systems. The customer may select appropriate regulating valves for the systems pumped at the constant flow rate, typically a three-way control valve, or configure In-Rack unit for variable flow rate with a two-way control valve and low-flow valve on the bypass to maintain minimum flow on chiller at low loads. In-Rack connected to the chilled water pipework via flexible, stainless steel braided hoses supplied with the unit. Solenoid-controlled isolation valves are available as an option.
Redundancy
The key challenge of the rack-level cooling systems is the lack of redundancy. In-Rack eliminates this drawback with redundant configuration which includes a dual power supply with an automatic transfer switch for instant switching to an alternative power source in the event of failure, how-swappable fans, controller power backup, and 2-pass heat exchanger which remains operational even in case of water leakage. In-Rack unit designed for continuous 24/7 operation and allowed easy access to the hardware installed inside the rack without disconnecting any services and disrupting cooling. Equipped with redundancy options, In-Rack unit ensures the highest possible availability for mission-critical IT equipment.

ADVANTAGES

HIGH COOLING DENSITY

In-Rack

Competitors

LOW WEIGHT

In-Rack

Competitors

SMALL UNIT DEPTH

In-Rack

Competitors

PRODUCT SPECIFICATIONS

Capacity [kW]	30 … 40
Cooling source	CHILLED WATER
Energy efficiency (EER)	395
Fan motors	EC
Heat exchangers	MCHE
Cooling circuits	SINGLE
Dew point control	AVAILABLE
BMS connectivity	AVAILABLE
Warranty	3 YEARS

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LATEST NEWS

Kaltra expands microchannel water coil nomenclature with new high-corrosion-resistance tube technologyMay 15, 2026 - 12:00 am
Kaltra introduces new downward-spraying distribution technology to boost microchannel evaporator performanceMarch 3, 2026 - 12:00 am
Extensive testing confirms highly improved frosting performance of reversible microchannel coilsJanuary 19, 2026 - 12:00 am

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In-Rack CW

SOLUTION FOR LOCALIZED COOLING AND HOTSPOT ELIMINATION

MICROCHANNEL EVAPORATOR

FEATURES

Hot-Swappable Fans

Rack Compatibility

Installation and Startup

Dewpoint Control

Cooling Circuit

Redundancy

ADVANTAGES

PRODUCT SPECIFICATIONS

RELATED PRODUCTS

Lambda In-Row CW II

Lambda In-Row CW

Lambda CW/CWU

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