User Manual

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Siemens Schweiz AG
Infrastructure & Cities Sector - Building Technologies Division
Gubelstraße 22, CH-6300 Zug, Switzerland
Press Relations: Vera Klopprogge
Phone: [phone]
E-mail: [e-mail]
Siemens AG
Infrastructure & Cities Sector – Building Technologies
Division
Rödelheimer Landstr. 5-9, 60487 Frankfurt am Main,
Germany
Asset analysis on site
To further improve the building efficiency of Lindner Hotel AG properties, Siemens’ Building
Performance Optimization (BPO) team analyzed a total of seven Lindner hotels in 2010 and 2011.
Lindner Congress & Motorsport Hotel at the Nürburgring – the only new construction of the seven
hotels investigated – posed particular challenges to the team. Although this new building already
offered a high level of energy efficiency, the energy experts still managed to identify additional
savings potentials. They then worked with the customer on the development of an improvement
strategy that consisted of zero-investment, low-investment and investment measures. Examples:
- Up to that point, the recooling plant (air-conditioning) had been activated by the device-
internal autonomous control system, as was the control of stepped operation. Proposal:
Activate and control the recooler together with the chiller via the building automation system,
based on actual demand.
- The chiller was turned on when the exterior temperature was as low as 8°C, even if the air
conditioner did not signal a need for cooling. Proposal: First take full advantage of the
potential offered by free ventilation and only then turn on the chiller with recooler. These two
measures could be achieved simply by reprogramming the system.
- Adjust the pressure setpoint of the air distribution network by opening the air flow controllers
all the way to make the fans run at full load. The pressure measured in the duct is then
defined as the new pressure setpoint.
- Although air flow adjustments are part of the BPO program, the team did not reduce the air
flows in the present installations due to an overly lean design of the ventilation systems.
Alternatively, CO
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sensors are to be installed in the exhaust air ducts of the HVAC systems
for the restaurant and the lobby.
- Investigate the potential use of a weather forecast-based control function in the control
strategy for the heating and air-conditioning systems.
- Add a free cooling function to the existing recooler. The chiller will then switch on at an
exterior temperature of around 16°C instead of 8°C. This requires intervention into the
hydraulics (installation of an additional plate heat exchanger), making it an investment
measure to be carried out at a later point in time.
Taking into account the unique features of hotels
An important aspect of the BPO analysis was the assessment of the measures from the hotel
operator’s perspective as well as the effects they might have on comfort. Result: Many energy-
saving processes that make logical sense have to be weighted differently in the hotel sector.