A salt gradient pond
has 3 wonderful layers of brine (a aggregate of salt and water) of various concentrations.
Because the density of the brine will increase with salt concentration, the maximum focused
layer bureaucracy at the lowest. The least focused layer is on the surface. The salts
generally used are sodium chloride and magnesium chloride. A dark-coloured material
commonly butyl rubber strains the pond. As daylight enters the pond, the water and the lining
take in the sun radiation. As a result, the water close to the lowest of the pond will become
heat as much as 93.3 °C. Even whilst it will become heat, the lowest layer stays denser than
the top layers, consequently inhibiting convection. Pumping the brine via an outside warmth
exchanger or an evaporator gets rid of the warmth from this backside layer. Another technique of
warmth elimination is to extract warmth with a warmth switch fluid as it's far pumped via a warmth
exchanger positioned on the lowest of the pond.
Advantages
 Environment pleasant power – no pollution
 Renewable power supply
 It may be used for lots motive which includes era of electricity, heating of fluids
 No want of a separate collector for this thermal garage system
 Low renovation costs.
3.6 Thermal Energy Storage System with PCM
Thermal power garage captures warmth from a warm fluid, and shops the power for later
use. Energy garage can commonly be determined in renewable power structures because of renewable
power reassets being diffuse and intermittent.
The number one additives in a thermal power garage includes the following :
Storage medium, warmth switch fluid, and the insulation.
 The warmth switch fluid captures warmth from sun irradiation, and transfers element of
the warmth to the garage medium.
 When the warmth switch fluid is going bloodless after sunset, the garage medium replaces the
solar as a warmth supply and heats the fluid.
Thermal Energy Storage or TES is described as a era that permits switch and
garage of warmth power or power from ice or water or bloodless air. This technique is constructed into
new technology that supplement power answers like sun and hydro.

A well-researched instance of a convecting pond is the shallow sun pond. This pond
includes natural water enclosed in a big bag that permits convection however hinders
evaporation. The bag has a blackened backside, has foam insulation below, and types
of glazing (sheets of plastic or glass) on top. The solar heats the water withinside the bag in the course of the
day. At night time the recent water is pumped right into a big warmth garage tank to limit warmth
loss. Excessive warmth loss whilst pumping the recent water to the garage tank has restrained the
improvement of shallow sun ponds.