Solar Water Heating
Solar water heating solutions use the power of the sun to deliver residential hot water with a minimal consumption of gas or electric energy. These systems are typically called passive solar heating systems, and they work by allowing sunlight to heat water that is contained in a series of black tubes within evacuated glass cylinders. They are similar to vacuum thermos bottles, but the water in the tubes flows from the cold water supply to a modified hot water tank within the house.
The water produced by solar thermal water heating typically reaches a sufficient temperature to be used without additional heating for at least part of the day. When additional heating is required, the heat is applied to water that already has an elevated temperature. This results in less energy use than standard hot water systems.
The tubes within the evacuated glass cylinders are black. Black materials absorb more of the sun’s energy than they reflect. The entire assembly is enclosed in an extremely well-insulated clear casing. The case is typically positioned on a roof and piped to a modified hot water tank within the house. As the sunlight passes through the glass of the casing and the evacuated sleeves surrounding the tubes, heat energy is absorbed by the tubes and heats the water they contain.
Hot water is less dense than cold water. As the water within the tubes heats, it rises. This draws cooler water up from the bottom of the tubes and sets up a natural circulation within the system. The heated water flows through the water tank and is eventually drawn back up into the tubes on the roof for additional heating.
The cooling effects of wind or rain are prevented from reaching the tubes by the evacuated sleeves and the insulated glass casing. This allows solar thermal water heating to function even in the winter months.
The proper placement of the insulated collector is critical for solar water heating. Proper installation of the tubes within the insulated collector is also critical because the tubes are delicate. Logan Home Energy Services understands these requirements and would be happy to evaluate your home for solar water heating suitability. Call today and let our experts determine if a solar hot water system is the smart choice for your home!