A review on solar water heating systems has been presented by vinubhai et al 2014.
Passive solar water heating system pdf.
The essential difference is that passive systems need no auxiliary power to operate while active systems are dependent on externally driven fans or pumps.
There are two basic types of passive systems.
With nearly 1 3 of the average electric bill devoted to heating water a solar hot water system is the best choice and smart investment you can make for your house and for the environment.
Passive solar water heating systems are typically less expensive than active systems but they re usually not as efficient.
Passive solar systems typically are very simple.
Passive solar hot water systems supply an average 80 90 of a household annual water heating needs.
The integral passive solar water heater.
Integral collector storage passive systems.
Passive solar technologies use sunlight without active mechanical systems as contrasted to active solar such technologies convert sunlight into usable heat in water air and thermal mass cause air movement for ventilating or future use with little use of other energy sources a common example is a solarium on the equator side of a building.
Passive solar water heating systems.
Passive systems may be less efficient at any given moment but they are much more dependable and cost less per unit of heat captured.
However passive systems can be more reliable and may last longer.