CUSTOMER: 

Elektrociepłowania EDF, Kraków

ADSRESS:

ul. Ciepłownicza 1, Kraków

TIME SPAN:

December 2010 – commencement of works

May 2011 – completion of works

CHALLANGE:
The server room for the F1 department in the BUS social insurance building was air-conditioned by two precision air conditioning units with a cooling efficiency of 32.4 kW each. With the investor assumptions enlarging the room, the existing air conditioning system would be insufficient to provide the desired room temperature. The biggest challenge was to organise the work so as to ensure continuous uninterrupted operation of the existing server room.

SOLUTION:
As such, an additional air conditioning system consisting of two identical units with a capacity of 100% of the demand, was designed. In the first stage of the work, a part of the newly-designed system was installed along with a raised floor and the existing systems disassembled and relocated. The second stage of the work consisted in rebuilding the existing server room and incorporating it into the newly-designed system.

SYSTEM DESCRIPTION:
At the investor’s request, devices for two air conditioning systems covering 100% of the cooling capacity were designed. The newly-designed precision air conditioning system works in cascade, alternating with the existing air conditioning units of the server room, and the two systems back each other up. One of the newly designed units works in parallel (cross operation) with the existing unit, while the other new system works in cascade as a backup in the case of a failure of one of them. The new layout of the air conditioning cabinets was based on chilled water aggregates located on the rooftop. They are connected via a cooling system with air conditioning cabinets in a room adjacent to the server room. Cooled air is supplied through vents in the lower part of the wall under the raised floor on which the server racks are placed. Cooled air is supplied through floor grills directly onto the servers, while hot air is collected by channels located directly above the server racks and transported in a close circuit back to the air conditioning cabinets, where it is cooled again. Heat from the air is absorbed by water and transported to the rooftop cooling aggregates. For UPS rooms, direct evaporation air conditioning units are also designed, also in redundant systems. The precision air conditioning cabinets are equipped with an in-built controller and a time card, which enables full control of the device parameters and alternate programming.

GENERAL DESIGNER:

Agencja Projektowa Tekton

SUPERVISION:

Jerzy Górecki

GENERAL CONTRACTOR:

Janex Sp. z o .o.

WORKS MANAGER:

Jarosław Hrehorowicz, CentroClima

INVESTOR:

“Elektrociepłownia Kraków” S.A. Wydział FI , ul. Ciepłownicza 1, Kraków