Comment Retroussez une couverture solaire
By tacoma5050
Solar blankets / covers: blue vs. aluminized silver back vs. black vs. clear
For years I have used a semi clear blue solar blanket on my 16×32 in-ground pool.
I usually take the cover off in the morning and put it back on when the sun goes down. My theory is that this allows the pool liner/etc to absorb sun rays during the day and retain radiant heat during the night. On cloudy days I leave the blanket on all day.
My current blue 12 ml blanket needs to be replaced and there are more options now than when I bought my last on 7 years ago. I plan on using my new blanket in the same way. Although I occasionally leave the blanket on all day if I don’t have time in the morning to remove it.
This website http://www.poolsupplies.com/covers/solar-covers.asp has five kinds available. I wrote my ideas after each one:
– Standard Blue Covers: would not let in much sun light during the day if left on, but maybe more than a sliver backed liner below.
– Blue/Silver(aluminized back) Covers: I think these may retain heat better at night, but if you happen to leave it on the pool on a sunny day will as much sun get into to pool and heat it?
– Transparent Black Covers; transparent black seems like conflicting terms, but will much sun get into the pool during the day? Will the fact that its black make the blanket itself absorb more sun heat and thus heat the top inch or so of water?
– Clear Covers: seems like this would allow more sun light to enter pool and heat liner in its left on during the day. I think clear would retain radiant heat just as well as a blue cove during the night, right?
– Diamond Covers: seems like bubbles being closer together would provide more insulation power.
On a sunny day which would heat a pool more of these 6 options:
1. Leaving the blanket off
2. Standard Blue Covers
3. Blue / Silver (aluminized) Covers
4. Transparent Black Covers
5. Clear Covers
6. Clear Diamond Covers
And out the above options which would retain heat better at night if any.
Can anyone share their thoughts, experiences and which type work best for you? Some people left bad review at InTheSwin for the silver backed blankets, but I am not sure if this might have been their first solar blanket and their expectations were too high, as other said they liked the silver backed blankets.
I just talked with a person at LeisureLiving. They said if I get 8 or more hours of direct sun on my pool per day that they would recommend the CLEAR cover as it would heat the pool the most if left on during the day. I asked about the DIAMOND CLEAR cover and he steered me away from that, he said when rolling up the cover the water cannot run off as well since the bubbles are closer together and thus the cover is heaver/harder to roll up. Still researching…..
By chem geek
I’d agree with them that with significant sunlight on the pool, a clear cover is theoretically better. Even white plaster pools absorb sunlight since it is water that absorbs around 60% of the energy from sunlight as described here. You should ask them if the clear solar covers absorb vs. pass-through UV light. If they don’t, then your chlorine usgae/consumption during the day will be higher due to greater breakdown of chlorine from the UV in sunlight.
By Vetpabst
I used blue covers and was very satisfide with them. Each lasted about 5 seasons. This year I was talked into getting a clesr cover. It did not seem to heat the pool up as well and I had algae growing for the first time. I think I will go back to the blue cover.
By Pool User
I bought the clear, with a silver back on our pool last year available at Specialy Pool Products. Beat out everythiing we ever used. Leave it off on super hot humid days, but other than that, on all the time. Just a small 15′ intex frame pool – but in PA we need all the heat we can get! Did not like the blue with silver back at all, and plain blue was only so-so. Never used black.
By Joseph2010
I see Folks are confused as to How to get the most from their Solar cover.
Know that having your cover sit in the Sun AND that chlorine will break down your cover. Don’t over chlorinate and either cover it or get it out of the Sun. Yes – it would be a pain to move it all the time BUT you have to decide IF you want to have it LAST longer. Fortunately the end of MY pool, where the reel resides, is shaded by trees .
Here is what I have found to work well to heat the water best. Know that heat rises. We have all detected the first few inches of water under the cover is hot. Whilst the Solar pool is on the water, select to have your filter on ‘full bottom drain’ – the bottom of the pool is where the water is the coldest. The filter will draw the cold water nearest the bottom through the bottom drain sending it back into the pool. As the inlet is closer to the surface of the pool the cold water will then MOVE the hot water – mixing it with the cold water. This then places cooler water just under your cover for solar cover heating. This also helps protect your solar cover from getting too hot. A cover getting too hot will split the layers.
Additionally be mindful to the fact your inlet assembly can be ‘adjusted’ to direct the water directionally as well as up and/or down. I have my inlet adjusted to direct the water just below the cover but not too close to the surface so that the cover will not ‘travel’ from the force of the water but yet enough to move that layer of hot water around. This will always supply cool water from the bottom of the pool under your cover.
Of course the bottom drain will help ‘pull’ the water down also.
P.S. – some of you may ‘think’ that full skim will draw the hot water through the pool best BUT – because of the location of the inlet being (high on the sidewall of the pool) you will have , by doing this, allowed that cold water to remain at the bottom of the pool. I have tried both ways by the way – my suggestion DOES work BEST!!!
Ummm – there will NOT be a charge for this guidance – a round of applause will do.
By chem geek
That’s good advice. Unfortunately, many above-ground pools do not have floor drains. In this case, pointing the return(s) down and to the side (i.e. diagonally downward) for a circular rolling motion of the water can help to circulate it.
By Renron
ChemGeek is correct.
Some of us with IG pools have infloor cleaning systems which distribute the water to the bottom of the pool, in which case the wall strainer is the best return location from which to pull.
By Merlin
You are right, I have used the blue blankets for years and now that I want to replace there are so many choices now. Blue or clear, backed with silver, and one company backs with gold and says will do the most heating. A couple also offer holes in the blanket for drainage. Evidently the clear blankets are much thicker and I read somewhere the solar blanket roller will not hold all the new weight. Then one guy told me the solar rings are better, so I am utterly confused about which one to buy. I did think the comment about using the bottom drain when the blanket is on was a good one, you get my applause. Sounds like a logical thing to do. Does anyone have a definitive answer about the best approach for blankets, clear, blue, lined, solar rings, silver back, gold back, holes in the blankets……………..
By chem geek
The gold is just marketing B.S. A pure black solar cover will absorb the most heat, but the black should be backing touching the water with clear bubbles on top. If the bubbles themselves are black on their surface, then that surface will heat up but not get transferred much to the water. If you use a black cover, then be sure to have the water circulation move near the surface, so returns would need to be pointed slightly upward in this case. The advantage of an opaque cover is that it will stop chlorine loss from the UV in sunlight.
A clear cover will allow for sunlight to enter the pool where it will heat the water more evenly at further depth (though more of the heating is near the surface). The downside is that the UV in sunlight will break down chlorine so your chlorine usage will be higher with such a cover.
By jlfitzpatrick
[quote=”Joseph2010″]I
I don’t use my 16 x 43 foot inground pool as much as I would if the solar cover could be easily retracted by one person. I hear nothing good about the “hand wind” devices. I LOVE my blue solar cover and need it in CT. Anybody have an electrically or mechanically retractable cover that works – or know of such? Thanks in advance.
By chem geek
I have an electric mostly opaque safety cover from Pool Covers, Inc. as shown closed and open. We now have a dark blue one instead of the tan one shown in the photos. The cover seems to need to get replaced every 3-4 years while some of the hardware gets replaced after 7 or so years. So it’s not cheap and one should figure that on average in the San Francisco Bay Area it’s around $350 per year (in peaks of $700-$1200) so more expensive than replacing a bubble-type cover every couple of years. That’s the price for convenience.
My chlorine usage is a lot lower even though the pool is used everyday (in the summer) with < 1 ppm FC per day chlorine demand. Most residential pools without a cover exposed to sunlight have 2-3 ppm FC per day chlorine usage.
Unfortunately, I don’t know who does electric solar cover installations in CT.
By getting back to the question
Getting back to the original question. I’m trying to figure out a consensus. Looks like clear covers win.
By BillD
I have only used the clear blue ones, and they work best when on the pool. You really need to look at how they work. The air in the bubble gets heated and water flowing across the cover absorbs the heat. If the heat isn’t absorbed the bubbles get so hot they burst. so, it is important to draw heat across the blanket to get maximum heat transfer and extend the life of the blanket. As well, when on the roller, the blanket needs to be covered to protect it from the sun. If you want a dramatic comparison of the difference between a clear/blue cover and a black opaque one, put both on some grass and see what happens. The other thing the covers do is prevent/reduce evaporation,and evaporation cools the water.
By jstars
I have used clear solar covers up until this year. They heated up the pool really well, but did cause algae to form (but that could have also been because it did such a good job warming the water!).
I started using a Blue-Silvered cover this year and after more than a month of constant covered use (with pump running during the sunniest 6 hours of the day the pool has only gone from 68->78 degrees so far, hitting 80 only once. I like to keep it into the 80s (and in NewEngland you have to Bank as much heat as possible to stretch the short pool season up here).
The idea about pulling more cold water thru the bottom drain and sending it to the top to mix with the warm sounds pretty good. I think my pump system is doing maybe 2/3rds bottom and 1/3 top now anyways. But I might even put a cleaner hose permanently into the skimmer and let it dangle down into the pool bottom so it no longer ‘skims’ (and maybe does some cleaning down there too).
Thanks for the good ideas on this.
By Dmanf
Did an experiment:
I used two identical cold tubs of water and covered on with a translucent blue cover, and I added a black layer to the other. There initial water temperature was 55. By the end of the day, they were 82 degrees. (8x18x4 inches water). POINT: The black plastic over the bubble cover did not affect any change whatsoever. The black may absorb more sunshine, but the opacity prevents solar penetration. All these covers with different color bubbles are marketing, marketing, marketing. I went with blue at half the price (and admittedly half the warranty. The warranty is essentially worthless anyway).
By chem geek
If you were to have compared with a white opaque cover, then there would have been far less rise in water temperature. Basically, the translucent one lets light through that heats the water while the dark opaque cover absorbs the light so gets hot and can heat the water that way though depends on where the black is — if at the top above the bubbles then heat won’t get transmitted very much (and instead it heats the air more than the water) but if on the underside touching the water, then heat should pass to the water.
We have used a light tan opaque electric safety cover on our pool in the past and then switched to a darker blue opaque cover and noticed an increase in water temperature with the latter of a few degrees (but we mostly heat using solar so the temperature difference would be greater if we didn’t have any other heating). These are not bubble-type covers so are just comparing the difference in color. The covers are only about half as insulating as a good bubble-type cover which is why the darker one was able to pass heat through to the water.
By Chris in upstateNY
One of the original questions asked related to heat retention. All the replies seem to only discuss heating capability and impact on chlorine levels.
I have an 18×32 IG in a yard flanked by tall trees on the south and west. Definitely not 8 ours of direct sunlight even at the height of summer. I live on a hill in upstate NY. Gets very hot in the summer, but can get cool at night. I have always found that for me, the cover is more blanket, and less solar heater, in that the key is having it on at night to prevent heat loss. A secondary benefit is having it on during the day on sunny days when the pool is not being used. But for me, that heating function, though important, has been secondary to the blanket function.
My cover just went to the dump. Light blue, round bubbles – no idea what mil. It tore and was taking on water, and became too difficult to take on an off, especially for my wife, thus limiting use.
SO. – I need a new cover and found myself as confused as the original poster. The cover needs to:
1. Retain heat at night (I really don’t care why I.e. whether due to evaporation prevention or whatever).
2. Provide solar heating during the day on hotter sunnier days. Note that per Joseph’s comment, I do have a floor drain and do not have a dedicated vacuum line).
3. This is a biggie: Be Manageable to take on and off – not too heavy, not difficult to crank on the roller, not too heavy for the roller.
4. Last for at least two seasons for every $100 of cost.
Recommendations as to color, thickness, manufacturer, and design would be appreciated, addressing w
Each of the four criteria. Thanks in advance for any responses.
By JPME
I owned an above the ground pool for probably a little over 16 yrs. In that time I’ve had every type of solar cover. My honest opinion is that black heats best. If you look at solar cell, solar heaters, solar anything they’re always black; to absorb heat. And like someone said in a previous post, just make sure your water circulates from top to bottom.
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