User Manual

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Siemens Schweiz AG
Industry Sector – Building Technologies Division
Gubelstraße 22, CH-6300 Zug, Switzerland
Press Relations: Petra Krokowski
Phone: [phone]
E-mail: [e-mail]
Siemens AG
Industry Sector – Building Technologies Division
Friesstraße 20, 60388 Frankfurt
The most important tool to maintain efficient and economical building operations is the
interdisciplinary Desigo building automation system, planned and deployed by system house IPM –
Innovatives Projekt Management für Gebäudeleittechnik GmbH, located in Feucht near
Nuremberg. IPM is a solution partner of Building Technologies (BT), a division of Siemens.
System house for building management technology brought on board at an early stage
Nuremberg-based Haustechnik Planungs GmbH was responsible for the planning of the extensive
electrical, cooling, heating, ventilation and air-conditioning systems for PUMAVision Headquarters.
Experience has shown that the overall energy efficiency of a building largely depends on the size of
the heating/cooling generators, the hydraulic components, the subdivision of the control loops and
interdisciplinary interfaces, for instance to lighting and sun protection. For this reason, system
house IPM was brought on board at an early stage of the project. IPM control experts made
valuable contributions to the design of the hydraulic system since the concrete core temperature
control deployed in the Office building poses challenges as far as hydraulic and control technology
is concerned.
At the core of heat generation are four plate heat exchangers with an equal-percentage
characteristic as part of a district heating transfer station with a total of approximately 2,000 kW;
they have been sized in such a way that in the summer a heat exchanger reduced to a heating
capacity of 200 kW is sufficient for heating. This allowed the control performance to be increased
significantly. All recirculating pumps (heating and cooling) are demand-based; they are controlled
by sensors which detect the weakest spot in the system in terms of energy flow. Heating and
cooling for the concrete core temperature control system is handled by two heat pumps, each with
a heating capacity of 145 kW and a cooling capacity of 225 kW.
Siemens-developed and lab-tested control modules based on the Desigo PX automation station
are used to control the thermoactive building system in the Office building. Initial operational
experience has shown that the concrete core temperature control heating system is turned off
when the outside temperature reaches 12°C; the Office building then heats itself. To allow
additional heating and cooling via individual room control, the concrete core temperature control
system is switched from summer to winter operations on demand by sensing the room loads.
Additional heating or cooling is achieved by means of radiators and fan coils respectively.