How Swimming Pool Solar Heating Functions

Nowadays, many methods are used to heat up water in a swimming pool. Usually all of them require some money expenses. But have you even thought about heating your swimming pool to a comfortable level completely for free? It is quite possible with the help of the sun. Everything you will need to make is the pool solar heating equipment that is a cheaper alternative to conventional heating boilers used for this purpose. And forget about cosmic utility bills!

Before deciding to install a swimming pool solar heating system it would be a nice idea to understand how it works.

The work of this unit is tightly connected with the principle of convection. Let's stop on it. Water in contrast to steam and ice can't expand or contract with the change of its temperature. Its mass or density does change - the warmer the water the lighter it gets. Warming some water and allowing it to move upwards when it gets lighter, and allowing cold water to go down, you receive a convection system.

When the cold water is directed from the bottom of a huge water tank, and the warmed water flows into the top of that very tank, the water will just flow around the system if the user heats the rising mass of water. It's an elementary water heating system without any moving parts.

The solar water heating system is notable for the fact that it is the sun that heats water for you. Such a system includes a solar collector directly connected to the water circulation pipes of the pool. The 'cold water tank' is represented by the pool itself.

A pipe from the floor of the pool is combined with the lowest point of the collector. The second pipe from the collector's highest point goes back to the inlet close to the surface of the pool. When the sun heats the water in the pipes of the collector, this water will move along the upper pipe into the swimming pool, and cold water located on the pool bottom will flow into the collector. In this way, the water will circulate between the swimming pool and the collector. And, as a result, the water in the pool will soon heat up.

Although this system is guaranteed to work but it needs some good tuning to work better. It would be excellent if you add a filter to the outlet pipe from the pool. Besides, a bleed valve can be fitted at the highest point of the pipe run. The matter is that any air in the pipes can considerably reduce the convection flow. It's recommended to remove air from the heating loop.

In addition, it's a wise idea to fit a non-return valve (NRV) to the solar collector at the cold water inlet. It will allow water run into the collector and not back from it. It's very important because, for example, during the night when the temperatures fall down, the solar collector water will get colder and try to run backwards into the swimming pool. The NRV can perfectly prevent this process.

As a matter of fact, some design parameters can significantly influence the efficiency of such pool solar heating systems. First of all, it is the collector's size. When the temperature of the pool water rises, some of the heat can be lost from the surface of water because of the radiation into the surrounding. The solar collector has to be big enough to not only heat the mass of water but also to overcome the heat losses due to radiation.

It's advised to select only chlorine-proof pipes to be used in the pool. The diameter of the pipe can influence the water flow. Remember to site the collector and have it properly mounted. Use a pool at night-time.


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