Solar pool heaters are the only and least expensive solar water-heating systems to put in and use in a home. the sole elements required are star collectors and a few further valves and piping. solar heating systems build use of the pump and filter already required for pool operations. star collectors, usually mounted on the home’s roof, absorb heat from the sun. The pool pump pulls water from the pool and forces it through the pool filters, a pressure-relief valve, a check valve, a bypass valve so through the solar collectors for heating. Once heated, the water flows through piping to the chlorinator (if used) and into the pool. The solar collectors raise the temperature of the pool water 5°F to 10°F between the water and therefore the outlet of the collector. The collector transfers most of the alternative energy that strikes it to the water, usually operational at 80% potency or higher. The series of valves additional for a star pool-heating system is vital, too. The check valve prevents backflowing of water from reentering the filter, and therefore the bypass valve controls water flow to the star collectors as needed once the pool reaches the suitable temperature and once it desires servicing.
Various varieties of star collectors are on the market for pool-heating systems. Site-specific factors, like climate and therefore the quantity of area available for the collectors also because the homeowner’s preference, typically drive the selection of solar collector.
If a pool has to be heated year-round and is found in a very cold climate, the collectors have to be compelled to be glazed—encased in a glass-covered insulated box—to stop freezing. Glazed collector systems usually use associate liquid resolution and a device to transfer heat to the pool water instead of heating the pool water directly. This setup is analogous thereto used for a solar domestic hot-water system, within which the water temperature has to be raised a major quantity.
Most solar pool-heating systems use unglazed collectors, however, as a result of the water temperature doesn’t have to be compelled to be raised a major quantity. the foremost standard unglazed collectors embody rigid polypropylene panels, EPDM (ethylene propylene diene monomer) rubber mats, ABS (acrylonitrile butadiene styrene) pipes, and metal tube-on-sheet panels consisting of copper tubes on a copper or aluminum sheet.
Metal tube-on-sheet collectors conduct additional heat per area unit of collector space than plastic or rubber collectors, however they’re costlier. once victimisation copper collectors, monitor the ph level of the pool water fastidiously. If the water becomes too acidic (lower than 7.2 pH), the chlorine within the pool water can react with the copper pipe, inflicting the water to go away a dark film on the pool walls. Metal is additional vulnerable to temperature reduction than plastic or rubber, though if properly maintained, metal collectors can last for thirty years or more.
Plastic and rubber solar collectors are additional popular than metal collectors as a result of they’re more cost-effective per square foot. additional are required, however, as a result of the thermal conduction of plastic is below that of metal. not like metal collectors, plastic and rubber collectors don’t seem to be vulnerable to corrosion from ph variations within the pool water. The lifespan of plastic and rubber collectors is 10 to 15 years as long as ultraviolet inhibitors have been additional to the materials to forestall injury from the sun.