If your questions are not answered here,

do no hesitate to write to us! 

Ground source storage

Is the ground source storage medium harmful to the environment / health?

We only use environmentally friendly and harmless frost protection concentrates based on glycols.

What size / characteristics is required for the ground source storage?

The geothermal ground source storage is designed specifically for the project; the size is calculated depending on the nature of the soil and the groundwater level (soil extraction capacity). As a rule of thumb, an average of 10-20m² per KW can be assumed. The geothermal heat exchanger can be laid on two levels below the building.

Does the geothermal ground source storage require approval?

Usually not. The ground source storage should be reported to the lower water authority with the building permit.

What pressure can the register mats underneath the building withstand?

The pipes have been tested with a pressure of 1,000 kN / m² (approx. 102 tons / m²).

What if the ground source storage lays in the groundwater?

If the ground source storage is located in the groundwater, no series of excesses can be stored. The temperatures in the brine storage tank are then not that high, but the groundwater provides free energy with very good extraction rates.

Does the subsoil have to have a certain quality for the ground source storage?

Not really, there are the filling materials recommended by us, but the building site is always determined by the structural engineer.

Can the base plate be damaged if I heat / cool the ground below?

In the temperature range where we operate the geothermal ground source storage (5 to 25 ° C), damage to the base plate is impossible.

Is the brine storage part of the building envelope?

The ground source storage under the insulated floor slab is outside the building envelope.

Can I install the register mats in the underground car park?

Yes, we have had very good experiences with installing the ground source storage in the foundation plate for the underground car park. The entire storage mass of the floor slab (concrete) can be included here.

Solar collectors

How big does the solar system have to be?

It depends on the nature of the floor, but also whether the system should cool and of course on the hot water and heating requirements.

The rule of thumb for the size of the solar system is between 1-2m² collector area per kW.

Can I use any collector (flat / tube)?

We only use flat-plate collectors for charging with ground brine, as these have ideal properties at low collector temperatures.

The collectors must be suitable for low temperatures, as energy at only 5 ° C is still drawn from the collectors.

Is the ground source storage harmful to the environment / health?

We only use environmentally friendly and harmless antifreeze concentrates based on glycols.

Can PVT collectors be integrated?

PVT (hybrid) collectors can also be used in the system. This also enables good results to be achieved in terms of loading the geothermal brine storage tank and module cooling (higher electricity yield). 

System efficiency guarantee

What does system efficiency guarantee mean?

We guarantee that the minimum temperature in the geothermal brine storage tank is maintained and that the regenerative coverage (%) according to the dynamic building simulation is achieved. We also guarantee the annual coefficient of performance of +/- 15% of the heat pump system calculated by us after the first two years of operation (building drying), and that for a period of 15 years.

What use is dynamic system simulation to us?

The dynamic simulation simulates the building's need for heat and cold over several years. All influences on consumption / user behaviour are included. The simulation enables important information to be processed in advance when designing the system, which supports efficient operation. In addition, the investor has the option of receiving an efficiency guarantee for his system and the annual performance factor (JAZ / EER) from BES.

Regulation and BMS

In which bus systems can your control be integrated?

There is a MOD-BUS interface to the on-site building management system. This means that third-party products could be integrated into our system and our control system could be connected to a higher-level BMS.

What about remote monitoring?

Our e-TALK 4.0 controller includes the option of remote monitoring via the Internet as standard. Error messages can be forwarded at any time after setup. When commissioning, there is the option of optimizing the system via the system. In recent years, the demand for remote monitoring and optimization has increased significantly.

Can system malfunctions be recognized at an early stage?

Yes, the error messages are immediately passed on to the ASP (e.g. customer service).Often the users have not even noticed that there is a fault in the system. This is possible via the remote maintenance of the e-TALK 4.0 controller. An internet connection must be available for the integration and the system must of course be set up for the user.

Roomcontrol: What are the advantages of automatic hydraulic balancing and what additional costs do I have to expect?

The necessary hydraulic balancing in buildings ensures even heat distribution in all rooms. The room control takes care of this automatically, dynamically and continuously and thus replaces the prescribed manual comparison of the circles. With its compact design, it offers the optimal solution for high energy saving potential and maximum energy efficiency. Thanks to hydraulic balancing even in partial load operation, the control loops are kept at the specified value. This makes hydraulic balancing superfluous and ensures maximum energy efficiency. The additional costs compared to a conventional individual room control with the fixed setting of the volume flows (at full load) on the distributor are very low over the years of operation. The greatest potential for savings lies in operation in the partial load range. So you shouldn't speak of additional costs, but of more efficiency / economy in connection with room control.

The BES System

Can your system also be combined with passive cooling?

Of course, there is the option of using the geothermal brine storage facility for passive cooling.

How high are the savings compared to conventional systems?

This is very different depending on the system and expansion level. Compared to conventional systems such as Additional investment costs that may result in district heating are quickly offset by the usually considerable savings in operating costs.

How big is the additional effort for cooling / temperature control of the building?

The additional effort is manageable. You need a heat pump with active cooling, the cooling lines must be insulated against diffusion, a cold buffer and room thermostats for heating and cooling.

Does the BES system also work with conventional underfloor heating?

Yes, our systems also work with conventional underfloor heating. With the same design, however, the register mats require an average of 3-4 Kelvin less heating medium temperature in order to achieve the required output per square meter. This demonstrably lowers heating costs and protects the environment.

Heating and cooling register

Why do register mats not produce such high surface temperatures?

Due to the tight, fixed pipe spacing and the small pipe cross-sections, the register mats have a much larger specific surface and higher heat flow density than conventional underfloor heating systems. Therefore, the BES systems result in ever lower heating medium temperatures (3-4K) on average and, due to the even distribution, also lower surface temperatures in the system.

What are the advantages of register mats over conventional underfloor heating?

Due to the favorable KvS values, not only 10-12m² per heating circuit, but 20-25m² can be laid with the BES system. This makes the distributor (fewer heating circuits) and the distributor box smaller, fewer actuators are required and savings are made in terms of acquisition, assembly and operation. Due to the high transmission performance, our mats are of course also very suitable for floor / wall cooling / temperature control and the flow temperatures can usually be 3-4 ° K (when heating) lower than with conventional systems - that saves a lot of energy and money!

The tension-free laying of the registers, the easy combinability with wall registers, the low surface temperatures (usually always below 28 ° C) and the resulting, healthy, comfortable climate. The register mats are the first choice for underfloor heating / cooling / temperature control.

BES BuildingEnergySolutions GmbH

Robert-Koch-Str. 50

55129 Mainz