Modern Data Center solutions include IT equipment of immense electric power that releases a large amount of heat, which creates huge challenges for the cooling system. Bearing it in mind, with the help of modern design tools and high-quality and proper implementation engineering, we implement complex solutions.
Cooling systems according to the equipment density
<3 kW / rack - Traditional cooling system from the raised floor
When designing such a solution we pay special attention to the positioning of rack cabinets and cooling system units and that way we:
- ensure smooth movement of the air from the hot zone back to the cooling system unit
- prevent the so-called ‘bypass’ air flow
- prevent mixing of the hot and cold air zone
> 3kW / rack – Closure of the hot or cold aisle containment system (HACS / CACS)
which enables a higher temperature of return air into in the cooling system unit, and at the same time its higher capacity.
< 5kW/rack - In Row
It represents the best choice with cooling units arranged in series (in-row) directly by the racks. In in-row systems the raised floor and grids in the raised floor are not used, and the air circulates horizontally between the hot and cold aisles which are strictly separated.
> 15kW/rack - In Rack
When we keep ‘blade’ servers in them, we suggest ‘in-rack’ cooling systems, where the closure allows the circulation of cold air inside the unit.
Cooling System Redundancy
Since the cooling system as well as the rest of the Data Center works 24/7/365, it is necessary to ensure its security in the form of redundant (spare) units. The most common configuration is N + 1, where N stands for the satisfying cooling capacity, plus one more as a backup.
Cold Water Systems
With this cost-effective system, the cooling is accomplished by a cooling generator (chiller), and the cooling medium is mainly water / glycol mixtures 70-30. Operating temperature regime is usually 7/12 C in order to reach the biggest possible capacity of internal units, and thus we reduce the capital costs of the entire system. It is also possible to use the ‘free cooling’ option without a compressor, which reduces operating costs while in use.
Systems with a Direct Expansion
Cooling is achieved by a compressor in internal units and by external capacitors and the cooling medium is generally R410 or R407. Such systems are generally less expensive than cold water systems, but they do not have the possibility of a free-cooling option.