When the water in your pool evaporates, it carries with it the heat, consequently cooling down your pool. So, if you can prevent evaporation, then you can significantly reduce the amount of heat loss. As such, covering your pool will help to warm the water up.
When pool water evaporates, it carries with it heat and therefore cools the pool water down. So if evaporation is prevented, then there will be much least heat loss. So simply put, covering your pool you will help warm the water up.
In short, pool covers do not need to be kept on pools during the day. By covering the pool at night and uncovering it during the day, you can save time heating your pool's water. Because dry, windy weather may increase evaporation, it is recommended to remove the cover only on humid, sunny days.
If your ambient temperature is decent and there is not much wind, leaving the pool cover off will heat the water faster (and not just heat the cover and the water near it).
The fastest way to heat your pool is to use a gas pool heater and a solar cover. It's like heating up your coffee in the microwave and putting a lid on it. No matter how you plan to heat your pool, you should at least have a solar cover (or liquid solar cover) to help you retain the heat.
Directly convert solar radiation into usable heat: In an in-ground pool, a cover can increase the water temperature by 5 degrees F for each 12 hours of coverage.
Black covers are opaque, allowing no light or UV rays to pass through the cover. The opaque quality and black color do allow for very fast and easy heat absorption, heating your pool quickly. However, this comes at a cost: black solar covers are typically the first to break down from wear and tear.
Heat transfer efficiency is higher with higher flow rates. However, you have to look at total efficiency and cost. It may be worth the extra heat loss to run the pump at lower speeds.
The short answer is that, for a standard 32 m2 pool, from a cold water standing start at the beginning of the swimming season, solar heating can heat your pool to a swimmable 28ᵒ C in just a few days.
A pool that is uncovered can lose up to 5 degrees F overnight; a good cover can cut that loss by half. Used at night or whenever your pool is not in use, the pool cover can help save fuel costs by cutting heat loss regardless of the type of heating you utilize.
So while a solar cover won't actually 'turn your pool green', it will warm your water by up to 8 degrees, so if the other conditions are right, adding a solar cover can easily accelerate algae growth, very rapidly. You need to get the water balance in your pool right before putting the cover back on.
So, do solar pool covers actually work? The short answer is yes. It has been scientifically proven by at least 3 studies that solar blankets help to warm swimming pools. They also help to retain pool heat at night, help to reduce humidity and help to save on energy costs.
According to the World Health Organization, water temperatures ranging from 78 to 86 degrees Fahrenheit are generally comfortable and safe for those engaging in moderate physical activity in a pool.
You should cover your pool every night for several reasons. First off, a pool cover saves energy and conserves water by decreasing the amount of make-up water. Also, it reduces the consumption of chemicals, and finally, it saves a lot of cleaning time since it keeps the debris out of the pool.
Without a heater it very much depends on the weather. A number of hot sunny days or quite a few cool cloudy days, anything from two days to a month. It also very much depends on how much you want to get in the pool, ie are willing to try the pool at cooler temperatures.
Water temperatures are slow to heat up, and just as slow to cool down. Water is very "stubborn" to change temperature. It takes 4 times the energy to heat up water than to heat air. Water also "feels" colder because water is a more efficent medium than air to cool our body down.
It is not advisable to heat your pool at night because of the time and energy it will consume. You're advised to heat your pool during the day for more efficiency, and if you can, buy a solar blanket to retain the temperature of your pool.
It depends on a few things to determine how long it takes a heat pump to heat a pool. However, overall a heat pump generally heats a pool after 24 to 72 hours by 20-degrees Fahrenheit. For smaller pools like a spa pool, the heat pump can heat a pool between 45 and 60 minutes.
No matter what size pump you are using, running it at lower speeds saves energy – and money. For example, you could run your variable or two speed pump twice as long as you normally would on its higher speeds and still save money.
The filtrations system can operate at low water flow with typical motor speeds around 1000 RPM or less depending on the size of your pool and how long you want to run the pump. Suction cleaners typically run at around 2200-2400 RPM.
A swimming pool tarp, for example, that's black on both sides is like a giant solar panel. Because a black tarp on a swimming pool's water surface traps solar heat energy, it will eventually turn cool, refreshing pool water into a tepid, warm bath.
When the "bubble paper" pool cover absorbs the suns rays it gradually heats the water in the pool while the cool pool water keeps the solar cover cool. The pool cover will usually heat the pool water up by one degree per day.
Dark Blue solar covers do the best job at keeping the heat in a pool, and although heat absorption and convection is higher with a darker colored solar blanket, the net heat gain during the day is less than with clear blankets.
Besides offering energy savings, pool covers also do the following: Conserve water by reducing the amount of make-up water needed by 30%–50% Reduce the pool's chemical consumption by 35%–60% Reduce cleaning time by keeping dirt and other debris out of the pool.
Solar Blankets will add heat to the pool to a greater or lesser degree, depending on 1) amount of surface coverage and 2) amount of direct daily sunshine. For a pool that is completely covered by a solar blanket, and one that gets at least 6 hours of direct sunlight on the pool, a 10-15 degree F gain is not unusual.