We joined a local swim club and have been going a lot and there’s something there that I’ve been wondering about.

They have a large main pool that ranges in depth from 2 ft, 8 in to 12 feet and a smaller kiddie pool that is 1 foot deep.

The main pool water is pretty warm right now, the weather here in PA has been pretty typically hot with it being around 89-90 today with heat index of 97-100. I figured the main pool water is warm because of the warm weather.

The kiddie pool on the other hand is always friggen FRIGID. It does have a pretty strong fountain in the middle that shoots the water up 12-15 feet into the air then it falls back into the 1 foot deep pool. Is it cold feeling due to evaporative cooling? It’s pretty surprising to me that the water in such a shallow pool can be so consistently cold feeling.

They might be draining it and refilling it often because of an excessive amount of urine in the pool.

What you’ve described might lower the water temp a few degrees, but not make the water frigid. My guess is that if the air temp is higher than the water temp, then only the air can get cooler as the heat from the air is used to turn the liquid water to water vapor.

I would assume the big pool has a filtration, sanitation, and heat system. Kiddie pools often do not have all that

I'll assume this is a indoor pool? If so,
• ASHRAE recommends 50% - 60%RH
• ASHRAE recommendation: “In order to minimize
evaporation the Air Temp should be maintained
2° to 4°F greater than water temp up to a
maximum Air Temp of 86°F.”

ASHRAE 2019 Handbook: HVAC Applications
Table 2 Typical Natatorium Design Conditions
Type of Pool Air Water Relative
Temperature, °F Temperature, °F Humidity, %
Recreational 75 to 85 75 to 85 50 to 60
Therapeutic 80 to 85 85 to 95 50 to 60
Competition 78 to 85 76 to 82 50 to 60
Diving 80 to 85 80 to 90 50 to 60
Elderly swimmers 84 to 90 85 to 90 50 to 60
Hotel 82 to 85 82 to 86 50 to 60
Whirlpool/spa 80 to 85 97 to 104 50 to 60

Outdoor pool obviously different scenario.

I vote for the idea that it is being drained and refilled constantly because of the kiddies peeing in it.

quote:

We joined a local swim club

This is a good question for their maintenance folks.

Particularly if the kiddies are complaining about it. Might it be set low on purpose?

The fountain does what it does, maybe a few degrees would be my guess. If the kiddie pool has a functioning heater and a thermostat all that would mean is slightly cooler water going into the heater and taken into account by the system.

quote:

Originally posted by hvactech:

I'll assume this is a indoor pool?

No, outdoor pool

As for the kiddie pool pool, I'm thinking as others have suggested that with all the pee, they frequently refill it. The temp when we get the water out of the production well was usually 58F.

I use a fountain in my swimming pool. It screws in to one of my jets and sprays over the pool. It reduces my water temp by 8-10 degrees. I'm in Texas and my pool gets full sun during the hottest part of the day. A friend of mine tried it first and told me how well it worked. I was surprised how much of a difference it makes. Previously during these 100 degree days my pool would feel like a warm bathtub. Now it's slightly cool.

While delivering and installing appliances in Maricopa County, AZ,

I delivered five or six refrigerators to people who used them for either misting the patio or pool deck or cooling their pool.

They would coil 200ft. or 300 ft.feet of garden hose inside and the cold water coming through their misting system was heaven.
One
That I saw put two holes on the door,
I coming and out going.

A football coach with a winter home ordered
One fridge for the mister ,one frige for the pool and one more for beer

This message has been edited. Last edited by: bendable,

quote:

Originally posted by trapper189:
What you’ve described might lower the water temp a few degrees, but not make the water frigid. My guess is that if the air temp is higher than the water temp, then only the air can get cooler as the heat from the air is used to turn the liquid water to water vapor.

Don't forget you have the sun's radiant heat on those pools too, which is a huge factor. This normally causes shallow pools to be pretty darn hot in the summer, compared to a deep pool at the deep end. The water which is many feet deep doesn't get all of the sun's heat and therefore deep water stays cooler.

A fountain will cool it a bit, but can only do so much compared to all that heat from the sun.

If y’all take away my excuse that the water was /really/ cold, I’ll be full of impotent rage like King Lear.

quote:

Originally posted by Ox190:
I use a fountain in my swimming pool. It screws in to one of my jets and sprays over the pool. It reduces my water temp by 8-10 degrees. I'm in Texas and my pool gets full sun during the hottest part of the day. A friend of mine tried it first and told me how well it worked. I was surprised how much of a difference it makes. Previously during these 100 degree days my pool would feel like a warm bathtub. Now it's slightly cool.

Could you provide me with a name and/or model number? My sister just had an inground pool installed at her house in Georgetown and was commenting on how warm the water is.
Thanks.

quote:

Originally posted by smlsig:

quote:

Originally posted by Ox190:
I use a fountain in my swimming pool. It screws in to one of my jets and sprays over the pool. It reduces my water temp by 8-10 degrees. I'm in Texas and my pool gets full sun during the hottest part of the day. A friend of mine tried it first and told me how well it worked. I was surprised how much of a difference it makes. Previously during these 100 degree days my pool would feel like a warm bathtub. Now it's slightly cool.

Could you provide me with a name and/or model number? My sister just had an inground pool installed at her house in Georgetown and was commenting on how warm the water is.
Thanks.

Daughter has this one off BezosWorld, there are several models. They just replace the cap on one of the built in jets.

Link

quote:

Originally posted by HRK:

quote:

Originally posted by smlsig:

quote:

Originally posted by Ox190:
I use a fountain in my swimming pool. It screws in to one of my jets and sprays over the pool. It reduces my water temp by 8-10 degrees. I'm in Texas and my pool gets full sun during the hottest part of the day. A friend of mine tried it first and told me how well it worked. I was surprised how much of a difference it makes. Previously during these 100 degree days my pool would feel like a warm bathtub. Now it's slightly cool.

Could you provide me with a name and/or model number? My sister just had an inground pool installed at her house in Georgetown and was commenting on how warm the water is.
Thanks.

Daughter has this one off BezosWorld, there are several models. They just replace the cap on one of the built in jets.

Link

This is the exact one I have. Considering making one myself that doesn't have a swivel fitting.