Energy generation and ideas for planned small motion pool

Another one of my "crazy" ideas ...

Due to my damn illness, I am supposed to regularly do exercises in warm water (preferably 28-30°!).

Since this is almost impossible in our village in the countryside, not only during Corona times, I am planning to build a small movement pool myself. My new tiny little plot would probably just barely allow it.

About 2.5 x 3m with a depth of about 160cm would probably be ideal so that two people can do exercises there (I am also thinking of other affected people who might then be allowed to use it).

Planning: Have the concrete worker make the appropriate hole directly, put perimeter insulation underneath and have a base slab poured. Then buy an "inexpensive" prefabricated pool made of plastic / GRP etc., and insulate generously all around and underneath again, then put a small strip of WPC or similar around the edge.

I will build the pool cover (hood) myself from aluminum profiles with 16mm twin-wall sheets so that I don't lose all the energy. I plan to generate this with a photovoltaic island system + heat pump and/or an absorber pool heater. Does anyone have a rough idea how much energy I need to generate to bring the pool with an estimated 12,000 liters to just under 30° (year-round!)

Unfortunately, only about 8KWp can fit on the main house, which should of course primarily supply the house heat pump and the new BEV.

Hot water from the house into the pool? Probably too much energy loss due to longer pipes?

Then a small sand filter system etc. - finished. Is the idea basically feasible?

push ... Too exotic this idea?

Pools are quite rare here as far as I know. Ask directly He has a pool

because I am supposed to move for health reasons as well, we bought a swim spa.

this

stands on a concrete slab. 6000 liters, 4400 x 2250 x 1300. We heat with solar and heat pump. 30 degrees is not warm enough for a spa. I don’t know the costs now, maybe €50/month but higher temp? In operation all year round.

Running costs are higher than for a pool because of the chemicals.

The problem is the cover (4-piece), it is not very light.

We have decided that others in the household can enjoy the jets, because for us a "just pool" is out of the question, because it’s too "boring." You can swim in it or lie on something to enjoy the sun. The latter I can also do with a sunbed in the garden.

Even with a pool, you need chemicals. The ongoing costs are only higher (with the same amount of water) if it is heated more strongly. Whether swim spa, whirlpool, or pool is a personal decision. Water attractions can also be installed in pools. With 4400cm length minus the seating area, I would remove the word "swim." It’s more like a larger whirlpool.

Having it "built in" right away is a great option. Please plan empty conduits for water, wastewater, electricity, control lines... Your pool would have a water volume of just under 10m3. That’s not excessively much and therefore easier to heat. I’m not familiar with "motion pools," but 1.60m seems too deep to me. Definitely plan a counter-current system if you want to swim sometimes. If possible, I would build bigger. The price difference is minimal. Insulation under the pool and on the walls is good, but the most important thing is the cover on the pool. At night, you can quickly lose 2-3°C. To heat one cubic meter of water by one degree Celsius, you need 1.16kW. Now you can calculate for yourself how many kW you need... With an 8kWp photovoltaic system, you will not be able to keep the pool at 28°-30° year-round.

If the house is close and you have a good heating system with enough reserve, you could heat the pool with it. Alternatively, heat pump or absorber. For the latter, however, you need space.

For filtration, it’s best to use a sand filter system and not cartridge filters. Don’t be fooled. The specifications from cheap manufacturers are not accurate (up to 20m3, etc.). Additionally, higher water temperatures require more attention to water care (filter times, etc.). To have as little effort as possible, I would automate the monitoring of water values and dosing. That means monitoring pH, redox, chlorine. Controlling the values via pH and chlorine. Backwashing the filter can also be done manually. Automating that is not necessarily necessary.

I know that you need chemicals in a pool, my neighbors (almost everyone here has a pool) need significantly less chemicals because it is not heated and the 20kg of salt or whatever it is costs a fraction of what you pay just for a spa.

I also think 1.6m is a lot.