Well, that might be thermal mass inside a dwelling, or water, as in hot water, heated by the sun.
H. P. Garg has written: 'Solar Thermal Energy' 'Solar thermal energy storage' -- subject(s): Heat storage, Solar thermal energy
It is called Solar thermal. Solar power can refer to the other type of solar energy which produces electricity. A solar thermal system is uses the suns heat to heat water in a storage vessel. Normally solar thermal is used to heat domestic hot water, but if a larger system is fitted it can contribute a small amount to other heating requirements such as underfloor heating. Also solar thermal is very good for heating swimming pools.
A solar thermal energy system typically consists of a fluid system to transfer heat from a solar collector to a reservoir or thermal storage unit for storing heat for later use. This system allows for the utilization of solar energy as a renewable and efficient source of heat.
Solar energy can be stored effectively without using batteries by using methods such as solar thermal storage, pumped hydro storage, or molten salt storage. These methods store excess solar energy for later use when the sun is not shining.
Sunlight is thermal energy. Passive solar system, passive solar design, passive solar window....you get the idea :-)
What is more effiecient? a solar thermal system or a solar photovolaic system?
this question needs to be stated more precisely. The solar fraction is a measurement of usage of the solar thermal energy by the solar thermal system installed.
Solar energy can be stored without batteries by using methods such as solar thermal energy storage, pumped hydro storage, or molten salt storage. These techniques store excess solar energy in different forms, such as heat or potential energy, for later use when the sun is not shining.
Useful thermal energy can be stored in various ways, such as in water reservoirs for hydropower, in underground caverns for compressed air energy storage, in phase change materials for thermal energy storage, or in hot water tanks for solar thermal systems. The stored thermal energy can be later converted into electricity or used for heating purposes.
Thermal collectors can capture solar energy as heat, which can be used for heating water or air. Photovoltaic collectors can capture solar energy as light, which can be converted into electricity using photovoltaic cells.
Direct solar thermal systems use sunlight to directly heat a fluid or material, such as water or air, for applications like heating homes or generating electricity. Indirect solar thermal systems use sunlight to generate heat that is then transferred to a separate fluid or material for storage or distribution, providing more flexibility in usage.
A solar heating system can provide heat on a cloudy day if it is equipped with a giant thermal bottle. The heated water or oil in the thermal bottle can be used to provide heat long after the sun is gone.