A solar water heater's efficiency is evaluated in various ways, making it essential to understand the different methods before investing in or purchasing one. The primary goal of a solar water heater is to transform sunlight into heat energy, which is then used to warm water for industrial purposes.
The most widely used method of rating solar water heaters is based on their thermal efficiency, which typically ranges between 50 to 90 percent. Heat efficiency refers to the system's ability to transform the sun's energy into usable heating. This percentage is usually denoted as a 'collector efficiency' since it assesses how efficiently the solar collector is able to capture and transfer heat from the sun to water. Some manufacturers provide higher efficiency performances by emphasizing on better heat transfer, effective insulation, and smaller heat loss during transfer and circulation methods.
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