The Difference Between CRAC & CRAH Units And Their Uses

Keeping data centres cool was simple in the early days of their development. Nowadays, with sizable data centres and higher server density, it is insufficient to cool computer rooms with typical air conditioners. Therefore, maintaining a stable temperature in data centres with precision cooling is even more crucial. Nowadays, facilities require more durable equipment to optimise air circulation for better data centre cooling, and CRAC and CRAH cooling units are two of the best options.

The following are the differences between CRAC and CRAH units.

Computer Room Air Conditioning (CRAC)

A Computer Room Air Conditioning or CRAC unit is comparable to a standard air conditioner. It intends to keep the computer rooms of a data centre at a consistent temperature, air quality, and humidity.

The primary components of most CRACs are:

· Mechanics

Depending on the sort of unit you choose, this component is different. The CRAC unit may occasionally come with a tension-adjusting belt. Mechanical systems can function better and survive longer if they are maintained.

· Refrigerant

It is a chemical substance frequently found in most air conditioners and cooling systems. Air filters collect particles that may raise the temperature inside. Ensure that your CRAC filters are clean since dirt accumulation could overwork your motors and reduce their cooling capacity.

· Compressors

When properly greased, CRAC compressors perform at their optimum. Using the wrong amount of oil can decrease its lifespan.

· Evaporator coils

Keeping the coils clean will ensure the CRAC unit operates properly.

Pressurise the spaces beneath the floors using CRAC cooling equipment by venting cool air through perforated tiles. Modern CRAC units include multistage compressors that help them change the airflow. The ideal applications for this cooling technique are in tiny, low-density data centres.

Computer Room Air Handler (CRAH)

CRAH cooling units perform the same task as chilled water air handling units in buildings. These systems employ fans to pump air across cooling coils to remove extra heat, similar to CRAC systems. Instead of refrigerant, these cooling coils contain chilled water.

The device draws warm air from the computer room and passes over the cold water coils. The water absorbs heat from the air before returning to the chiller. Fan speed can be controlled by CRAH devices, guaranteeing consistency while allowing for humidity and temperature level variations.

The primary distinction between CRAC and CRAH cooling units is the employment of compressors and refrigerants in CRAC units vs chilled water and control valves in CRAH units. For data centres with reduced availability needs and electrical loads under 200 kW, CRAC cooling units are the best option. The cooling cycle used by CRAH cooling units is more effective and better at removing heat. When installed in centres with less than 100 kW of electrical IT loads, these systems can be expensive but are frequently more cost-effective over the long term.

Canatec has more than 14 years of experience designing, installing and maintaining various data centre equipment. Their skilled team of engineers and technical support specialists is well-versed in the demanding requirements of such situations. Additionally, the company is the sole distributor of Canatal technology. Visit Canatec’s website to learn more about the firm, its products and its services, like precision cooling.