![]() ![]() This is called reflected light, and it enhances your exposure to the sun. According to Cancer Research UK, about 10 percent of UV rays are reflected off of the water. A low sun angle has a more difficult time warming water because a great percentage of the solar radiation is reflected away. When you're near or in a body of water, the sun is shining down on you from above, but it's also shining off the surface of the water and reflecting back at you. When the sun is low on the horizon (low sun angle) more radiation will be reflected off water. A rippled but locally smooth surface will. This meteorologist seems to confirm that a low sun will reflect heat: The Sun reflects off seas and oceans because the water acts as a smooth surface on a macroscopic scale. I understand that the surface of the water is not a perfect mirror and that only a proportion of the light/heat would be reflected. Whilst the reflectance pool would undoubtedly contribute to daylighting and would help in the winter months to reduce use of artificial lighting, it is suggested that the water may absorb most of the incoming shortwave energy and release longwave radiation (heat) back to the sky.Ī StackExchange on whether reflection preserve wavelength suggests that a perfect mirror will preserve wavelength. I had planned to use a reflecting pool of water to increase the passive solar gain in the house in winter:Īnd reflect it away in the summer (note the structure on the left side of the house is a lean to greenhouse which is why the light is shown as traveling through it): ![]()
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