Hotel Maximilian's (formerly Drei Mohren Hotel) in the middle of Augsburg's city center is a traditional 5-star superior hotel with a history of over 300 years, which is characterized by comfortable and luxurious furnishings.

Even before the energy-saving contracting with ENGIE, the hotel had modern building technology: a well water system including a heat pump was used for heating and cooling, and modern ventilation systems with zone control ensured a pleasant indoor climate. However, the project with ENGIE confirmed that the installed plant technology was not running optimally in operation. Rather, the records of the well water use showed that the temperatures of the groundwater were continuously moving upwards over the years, which meant that there was a need for action with regard to the well permit.

Optimization potential was quickly identified by ENGIE's energy experts and implemented on a turnkey basis as part of an energy-saving contracting program. A large number of measures help to meet the official requirements on the one hand and to increase the energy efficiency of the building and the user comfort on the other hand.

Our services

Building automation

• The core element of all measures was the adaptation of the building automation to the best possible system operating point

Heating/cooling

• Hydraulic and control optimization in the distribution network led to improved use of the heat pump for heating and cooling purposes
• Better utilization of the existing waste heat potential minimizes the need for district heating
• Use of the well as a seasonal energy store: In summer, the cool groundwater helps to air-condition the premises, while the stored thermal energy can be used again as an energy source in winter

Ventilation

• Optimization of demand-based control of individual ventilation systems via volume flow controllers and air quality sensors
• Improvement of the operation of the ventilation systems through adjustment and fine tuning
• Adaptation of the system operation to the actual use of the supplied areas

Lighting

• Refurbishment of around 200 lights to LED technology

Monitoring

• Use of an energy monitoring system for continuous consumption and efficiency recording
• Determination of key energy figures and preparation of automated energy reports
• Connection of electricity, water and heat meters to the energy monitoring system for success control and continuous readjustment

Contract period

• 5 years