Solar Hot Water Systems
Solar hot water systems use the sun’s energy to produce hot water. At Solar One we install and supply solar thermal systems to produce hot water for a wide range of domestic and commercial uses.
How does it work?
A solar thermal system needs to capture, retain, transfer, and store the sun’s energy as efficiently as possible. To do this, a solar thermal system consists of a pump station with a solar controller, a solar storage tank as well as one or more solar collectors.
The solar controller compares the temperature of the collector water in the panel to the temperature in the solar storage tank. If the temperature of the water in the collector is more than 15 degrees f higher than the water in the solar storage tank, the solar controller turns on a circulating pump to transfer the heated water or solar glycol from the collector to the solar hot water storage tank. In the evenings as the sun starts to set, the controller again compares the two temperatures and will turn off the circulation pump when the stored water is within 12 degrees f of the collector.
Are There Different Types Of Solar Thermal Collectors?
There are two main types of collectors:
Flat Plate Collectors – flat plate collectors are designed for heating anywhere from 25 to 125 degrees Fahrenheit above ambient air temperature depending on where you are located and season. These types of collectors are the most efficient at heating water up to 140 degrees f. Flat plate collectors use an absorber plate usually covered with a low-iron tempered glass with a selective coating and insulated behind to prevent heat losses. Heat is transferred to the water via pipes lying along the absorber plate within the collector. They tend to be simpler and slightly less expensive compared to an evacuated tube collector.
Evacuated Tube Collectors - evacuated tube collectors are primarily used when there is a requirement for the water to be heated between 160 to 210 degrees Fahrenheit. These types of collectors use an evacuated glass tube to enclose a slender absorber plate. Heat loss is almost eliminated by the vacuum in the tubes, making this collector more efficient at higher temperatures than the flat plate. In some cases the smaller size of evacuated tube collectors make them a better choice on roofs where space is limited, for example for roofs with dormers or sky lights.
Solar collectors are typically but not always roof-mounted, facing south, capturing the heat produced from the sun.
Solar domestic hot water systems, are an environmentally friendly and inexpensive way to heat the water used by you and your family year round.