Cold Aisle Containment built in Nokia Krakow server room!

Huge changes in Nokia Krakow server room happened – new containment has been built it.

Huge changes in Nokia Krakow server room happened – new containment has been built it!


Krakow TC used to have server room built in an old traditional technology, where hot and cold air was mixed together decreasing cooling efficiency. Recently we increased the amount of servers, which required additional air conditioning. Firstly, our business case was to save opex costs of electricity and increase A/C system efficiency (PUE) and decrease number of incidents related to overheating – already warned about possibility of lost warranty for installed servers. Secondly, we wanted to reduce number of site visits caused by overheat alarms from servers (over 550 servers installed). Thirdly, we wanted to reduce the environmental impact by lowering energy consumption.

We saw the solution in both: rearranging the IT space (replacing some racks to making them compatible), as well as building Cold Aisle Containment. Today we can say: we did it! The project is accomplished!

The newly built containment system isolates hot aisles and cold aisles from each other and prevents hot and cold air from mixing. This system allows significant savings by limiting the electricity consumption in the air conditioners up to 30%.


The project consisted of few different steps that had to be undertaken:

- the server racks were rearranged, so we could prevent mixing of cold and hot air in the room;

- new electrical installation was implemented to energize devices in HP racks;

- new optical connections for the switches were installed;

- glass walls, doors and roof were built (around 26 server racks);

- the tiles from upper floor level were removed and replaced by lattice, so the cold air could access into the alley (see the blue arrows on the attached graphic).

Many people from Krakow TC have been involved in this unquestionable success: First of all, whole Lab team, but also Wipro (Zaheer Liakath) and HP. It is difficult to overestimate the contribution of Wojtek Rzeszutek, who coordinated this work, as well as Bogdan Madeyski, Tomasz Sztuka, and Slawomir Krzywak.