Ground collector, do you have to change the liquid/hoses?

Hello everyone,

we are currently planning the construction of our house as well. A developer recommended a heating system with ground collectors to us, since we have a large plot of land (around 1000m²).

Now my questions about this:

Do you have to change the fluid regularly here as well, like with collectors on the roof?

Do the "hoses" here also have to be replaced after about 20 years like the roof collectors, or do you lay them once and then have peace forever?

I would appreciate answers
Regards, Andre

Hello,

....we are currently planning the construction of our house as well. A developer recommended a heating system with ground collectors to us because we have a large plot of land (around 1000m²).

Basically not wrong. For ground heat collectors, apparently surface collectors here, the annually required extraction capacity and energy, soil type must be known. Only based on these can sources be sufficiently dimensioned. Undersized => poor annual performance factor. Oversized => money wasted uselessly. One must not forget that overbuilding is excluded, possibly restrictions in the use of the area.

...Do you have to regularly change the fluid here as well, like with collectors on the roof?

No.

...or do you install them once and then have peace forever?

Yes! Best regards

Hello €uro,

first of all, thank you for the quick reply.

We do not know the annually required heating capacity and energy as well as the soil type, the consultant only calculated that we need 6480 watts and have to lay 243m² area with pipes, could that be correct?

Regards Andre

Hello,

...The annually required heating capacity and energy as well as the soil type are unknown to us, ...

Then it is not possible to sensibly dimension a brine source.

...the consultant only calculated that we need 6480 watts and must lay out 243 m² of area with pipes for this, ...

What performance should the 6.48 kW be? Is DIN EN 12831 stated on this calculation? Is there a controlled residential ventilation, and is there an agreement on the desired room temperatures?

Best regards.

Hello,

so there is no DIN on it, it’s just a scrap paper but as far as I understood he calculated:

WF 160m² would be JHK of 285€ and that corresponds probably to 4480W
4 pers. would be JWWK of 200€ which would then be 2000W
total 485€ per year and 6480W per year
with 6480W he then calculated 243m² but don’t ask me how.

By now we don’t even know what the best heating system is. Yesterday we were at another builder and he immediately talked us out of geothermal energy with collectors. He said the effort to lay the pipes is not proportional to the benefit. He recommended gas or an air-water heat pump. Now we probably have to decide on a variant ourselves without knowing if it is the best or not.

Regards Andre

Hello,

....so there is no DIN standard on it, it’s just a scratch paper ...

Amazing how many unexperienced people are impressed by such scratch paper acrobatics and even sign a contract worth tens of thousands of euros on such a basis :confused:

....By now we don’t even know what the best heating system is.

There isn’t one, but usually only a particularly sensible solution. To find this, a basic assessment must first be carried out. However, this is considerably more complex than filling out any scratch paper. ;)

....Yesterday we visited another developer and he immediately talked us out of geothermal energy with collectors. He said the effort of laying the pipes is not in relation to the benefit.

The more developers you visit, the higher the number of possible variants. Of course each one generally sells their concept as the all-encompassing best. ;)

....He recommended gas or an air-to-water heat pump to us.

Such recommendations without reliable basis are usually taken out of thin air and primarily correspond to the seller’s obligations.

.... Now we probably have to decide on a variant ourselves without knowing whether it’s the best or not.

This can be easily remedied. For this, a defined building structure (components) is first required. There are plenty of ideas, suggestions, and offers for this. Based on this "framework" together with the climate location (data) of the building, the orientation on the building site, user behavior (room temperatures, hot water demand, etc.), the actual demand (capacity, energy) for heating, hot water, and if applicable ventilation is determined. This should be done by an external technical building services (TGA) planner and energy consultant independent from sales. Once the figures are known, the economically optimal solution can be found relatively quickly. Usually a comparison of variants is advisable. Often afterwards, minor corrections to the building structure are also useful.

Best regards,

NB: Saving energy costs often begins with the choice of the building site!