Research for energyoptimised construction Project Details Volkswagenbibliothek… — Volkswagen Up

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Project description

The building has evaluated by the Institute of Building and Energy Design (IGS) at the University of Braunschweig since 2005. A particular focus has on the performance of the ground absorber, is important for controlling the temperature of the by means of concrete core It uses the ground beneath the as seasonal thermal storage. As of the evaluation, diverse construction were rectified and the system fully functional. Optimisation have been gradually since the beginning of 2007.

concept

The five-storey building a rectangular form is located in on the corner of Hertzallee, in Berlin-Charlottenburg. The which is aligned on a north-south is entered from the Fasanenstrasse via a foyer. In addition to the entrance the west side also a cafeteria, lecture theatre and rooms on the ground floor. The spaces are housed in the four floors on the west side. A with the two staircases is located the middle of the building. The open-shelf are situated between the patio and the tract on the eastern side. The which has almost twice the area as an upper floor, book stacks, technical and a workshop.

The building envelope was in accordance with the German Saving Ordinance (EnEV) 2002.

Energy concept

A role in supplying energy to the is played by the 8,100-m² ground which utilises the ground the building as thermal storage.

Combined with concrete activation in the offices and the reading the ground absorber is used for and cooling. A heat pump energy from the ground in the enabling the ground to be used as a source in summer for free If the free cooling via the ground is not sufficient to cool the ceilings, can be supplied to the concrete ceilings via a with a recooling system on the The chiller also supplies the air unit in the server rooms and the exchanger deployed for the ventilation used for the special book stored in the basement. In winter, loads in the offices and the reading are met by deploying fixed radiators district heating.

The open-shelf are located within the building away from the facades and have reduced heating and loads. As with the stacks in the these are not cooled and heated via the ceilings. In winter, these are supplied with district via the fixed radiators.

The office in the building are ventilated throughout the by means of the windows. The reading spaces, open-shelf stacks and depot in the basement are supplied fresh air via air supply and exhaust Sorption technology is used for the air conditioning, whereby the air is cooled and by means of drying and humidity that respectively use district and water. External solar reduces the solar gain and the energy requirements for cooling.

Building management

All central are controlled by means of the building system (BCS). Using the BCS the operator can define time and change target values.

the air supply conditioning via the air conditioning and the supply line temperature for the heating and cooling systems are centrally in accordance with the temperature. This means in accordance with the exterior the concrete core activation is supplied via a two-pipe system in operation with heating or energy. Depending on the room measured via individual reference the control valves for the individual circuits are opened or closed.

The themselves have no influence on the It is only possible to provide heating in the offices using the thermostatic valves on the fixed The air quality and, to a limited the room temperature can also be by means of manual window The solar shading is controlled for facade and in accordance with the In individually used areas as the offices and the seminar rooms, can manually override the solar

The energy management in the building is out by the TU Berlin. The Institute of Building and Energy Design (IGS) is the TU Berlin with detailed analyses and, derived them, optimisation proposals. By of Internet-based data transmission, the BCS is used for operational monitoring and In addition, a measurement concept was and implemented for recording the consumption and profiles for the main energy and load groups.

Evaluation: Building performance

installed technical systems, errors and regulation strategies were not accordingly adjusted to the use of the led to considerable problems during the operation. In addition, problems also caused by the fact the designers, installers and operators experience in using the innovative and complex seasonal geothermal and the sorption technology in the ventilation

For example, neither the ground-coupled pump nor the conditioning of the supply air reliably. Because a large of the building systems equipment did not the energy and water consumption was too Furthermore, there was an unsatisfactory of comfort with room ranging between 25 and 27 °C – both in and winter(!). It was possible to rectify one relatively quickly and simply: The temperatures for the concrete core control were lowered to a level. Prior to this, to a non-functioning heat pump and an in the control system, local was fed into the concrete ceilings at far too a temperature.

The excessive room in summer are caused by internal that, as a result of a change in are considerably higher than originally envisaged during the The building systems equipment was not to cope with such loads. The lack of heat from the ground during the months and the excessive absorption of by the ground during the first caused the ground to heat up. For reason, the ground was unable to sufficient cooling the following

It was possible to identify the three systems with sorption as major consumers of energy and One of the three systems alone 14% of the overall electricity, 22% of the district and 18% of the total water required in the

Optimisation: Potential, implementation and

The operating analysis includes monitoring to record the electricity, heating and water consumption as as the user comfort in the different of the library.

As part of the energy-oriented of the operations, numerous faults rectified and, by means of measures, the building services were made fully The measures decisive for improving the efficiency and comfort are listed

The operating times of the ventilation were reduced.

The “free operating mode is now used frequently, i.e. the operation is now on an extended range of external In this operating mode, the air is not conditioned; instead the exterior air is directly as supply air.

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The is now passively cooled in summer: In the hours of the morning, cool air is fed into the building via the smoke system.

The internal loads by the lighting have been

By rectifying the hydraulic faults in the and optimising the control of the concrete activation, it is now possible to utilise the energy more efficiently.

control-based coordination of the concrete activation and the fixed heating more geothermal heat to be for the room heating, i.e. heat is extracted from the

The high internal loads and the of cooling capacity provided by the absorber made it necessary to chillers. Operating this refrigeration technology contradicts the however, of reducing electrical loads.

Cost-effectiveness and durability

In the primary energy consumption to 317 kWh/m² p.a. (the have been assessed regard to the primary energy and relative to the net floor area). the system was brought into a state, these values increased in the subsequent year to 347 p.a. The optimisation measures in 2007 then reduced the to 285 kWh/m² p.a. In 2007, the values for the final energy for electricity was approximately 91 kWh/m² and for heating 57 kWh/m² p.a.

The of faults and optimisation of the operation considerably improved the thermal in the library. For example, the number of of overheating in the reading rooms was in 2007 relative to 2006 by up to 10% to 2% of the hours of use (total 3,796 h In the offices, which are used for a of 2,600 hours a year, it was to lower the number of hours of in each room, which ranged between 5 and 25%, to 0 and 12%.

Since the measures out predominantly relate to changes in the or were measures conducted as of the rectification of faults in fulfilling the implementation of the measures did not lead to any investment costs. This enabled the energy costs for and heat to be reduced in 2007 by 126,000 euros compared to the year. In addition, around euros were saved in to the water usage (for the technology).

However, it will not become whether the energy-oriented optimisation of the leads to sustained savings in the term until the results available for the next few years. potential has been identified for the systems using sorption Moreover, the temperatures in the ground the ground absorber need to be further so that free becomes possible again, conventionally generated refrigeration to be by renewable refrigeration.

More will be provided during the of the project.

Key energy data


energy consumption data (in 2 a)

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