Pool Heat Exchanger Assistance...

Winter? LOL But in a more serious tone, lots of reasons, one of which could be that the heat loss from the pool is greater than the heat input into the pool. I don't have a pool, just a lake that now has 75 cm of hard, white stuff on top of 0C liquid. Bummer. Others who have pools and heat exchangers likely will have better advice.

What are your temperatures (pool side) heading in and out of the HX?

For the most part it really comes down to the basic thermal laws. Heat (thermal energy) always flows from hot to cold...IOW as long as your pool is warmer than anything in contact with it, it is always going to be losing heat to its surroundings. In order to supply enough heat to: 1) counter the heat being lost to its surroundings and 2) increase the average temperature of the pool, you'll obviously need to supply it with enough water, at sufficient temperatures, for a long enough time. Considering there's both a lot of water, but also signficant amounts of concrete/soil/other materials surrounding the pool, that could take some time.

Assuming the heat exchanger is doing what it's supposed to do, the heat loss from the pool at 26C with the outside world at 10C is 140,000 BTU/hr (to mix some units) by the empirical fact that the temperature is stagnating there. I guess you could sanity check with your gas meter and the efficiency (claimed) of your boiler to see if it's consuming 33.6 (/eff) therms per day. ie, 37 therms/day for a 90% boiler, 42 for an 80% boiler.

Odds are excellent that the pool insulation is not what you'd hope for, especially if you are trying to run it at 30 C. The only things that come to mind that would be quick and easy are top surface insulation - either the "floating ball insulation" that you can leave in place and swim through, or an insulated cover you could put in place when not swimming. Other than that, more heat exchanger (the crude engineer would drop 300-1000 feet of PEX into the pool...the fancy one would add another heat exchanger, and check the boiler size to see if you also need to add another boiler, or if the one you have could run two HX.)

What size boiler do you have connected to it? How many gallons in then pool? It takes a lot of BTU to do pool heating.

A&R is still around they made indirect tanks and HXers for some years back in the late 90's. They were more of a truck accessory stainless fabricator. Their tanks were fairly leak prone.

They probably have spec sheets somewhere to tell you what to expect at various flow rates and temperature differences.

Usually those tube HX required fairly high operating temperatures from the boiler to get even close to the rated output. I'd guess you need 12- 14 gpm at 180F supply to get much performance.

Dispo96 said:

How do I checck to see if my boiler is consuming what it's supposed to? I have two identical boilers, I could get the models for you

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The boilers are gas? clock the meter.

Dispo96 said:

It is a : Weil - McLAIN CG Series 11

Pool is roughly 18KGallons

By leak prone, do you mean that the Glycol could be leaking in to my pool? -_-;;

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I meant their indirect tanks had some leak issues.

Typically for a covered, inground pool that size you want around 300,000 BTU, if you expect any recovery. I think you have about 1/2 the capacity you need, to raise the temperature or maintain it, depending on the cover, which makes a bi difference. When it's on

Location matters also, if it gets any wind, that will strip heat quickly. Fences or hedge rows help pools in windy areas.

Plenty of online pool sizing guides. It's an expensive hobby keeping pools warm. Sort of like heating the great outdoors.

Dispo96 said:

My pool is IG/Indoor, the outside world has little effect on my pool. What's a 300,000 BTU HX go for? Would that actually heat my pool a lot quicker?

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A larger HX, capacity wise, only works if you have enough boiler output to drive it.

Remember too, with an indoor pool, you either heat the space, to lower the load on the pool heater. Or the pool itself heats the space. There is no free lunch

If it's 0 degrees outside, the walls and or windows around the pool also lose heat, either the pool makes that up, or the heat in the room. Keep the room at 80F, and the pool heater load drops.

The biggest problem, or challenge with indoor pools if handling the humidity and moisture, especially when uncovered.