Question 1

It is more expensive to drill deeper boreholes.

Accepted Answer

If you drill fewer deep boreholes instead of many shallow ones, you can save a lot of money on casing, trench digging, manifold chambers, set-up time, etc. These costs usually exceed the increased drilling cost by a good margin. MuoviTech has collectors adapted to deeper boreholes. Contact us for help choosing the best collector for your project.

Question 2

It does not matter which collector you use.

Accepted Answer

To have an efficient geoenergy system, you need as efficient heat transfer between the ground and the brine as possible. The collector acts as a heat exchanger in the ground and has a great impact on how well the system works. TurboCollector creates a turbulent flow in the brine, which leads to a better heat transfer. Contact us if you are unsure which collector is right for your project.

Question 3

The valves must be fully open for the heat balance.

Accepted Answer

The adjustment valves should be adjusted during commissioning of the system and after a period of operation. If all valves are left fully open, some boreholes will have too low flow and some too high. This causes the geoenergy system to become skewed and less efficient. MuoviTech has a wide range of balance valves.

Question 4

You do not need to make pressure drop calculations.

Accepted Answer

Knowing the pressure drop you get in a geoenergy system is crucial to getting an efficient system. If the pressure drop is higher than the pumps can handle, it will cause the heat pump to have a lower flow than what it is designed for. This leads to higher delta T, colder brine and worsened COP.

Question 5

All brine fluids are flammable.

Accepted Answer

Usually, ethanol is used as a brine in most geoenergy plants. It is flammable, environmentally harmful when released, has a low density and becomes turbulent only at high flow. There are alternatives to ethanol. MuoviTech sells Kilfrost GEO — a brine that is non-flammable, non-toxic, has a high density and quickly becomes turbulent.

Question 6

It is expensive to use pre-insulated PE pipes.

Accepted Answer

If you follow the instructions for placing collectors in geoenergy systems, you can save both time and money by using pre-insulated PE pipes. Less excavation with insulated pipes is necessary, which saves costs immediately.

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