How it works: Solar thermal system


A Typical Solar Installation

The diagram below shows a typical solar installation for domestic hot water with a twin coil hot water storage tank. This enables energy input from the central heating system to the top half of the tank and energy input from the solar system to the bottom half of the tank.

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Solar collector – the efficiency and quality of the collector determines the performance of the whole system.
Siurblinė vandens cirkuliacijai tarp kolektoriaus ir talpos palaikyti
Talpa su dvigubu šilumokaiciu
Katilas ar kitas šilumos šaltinis
Karšto vandens imtuvai
Valdiklis temperatūros jutiklių pagalba seka vandens kolektoriuje bei talpoje temperatūrų skirtumą bei valdo siurblius
Išsiplėtimo indas, skirtas vandens tūrio dėl temperatūrų didėjimo plėtimuisi kompensuoti bei sistemos slėgiui stabilizuoti
FACTS

Solar thermal technology transforms direct and diffuse solar radiation into useful heat using a solar collector, which should face as closely as possible to the south at an angle perpendicular to the sun.

PROCESS

All components work together to heat water from sunlight:

icon-P1 Sunlight hits the solar collector and heats thermal transfer liquid passing through it.
A pump circulates the heated thermal transfer liquid from the solar collector to the water tank coil, where its heat transfers to water within the tank.
The pump returns the cooled thermal transfer liquid to the solar collector for reheating.
When needed, a back-up heat source, such as a boiler, ondemand water heater, or electrical immersion element, boosts the tank water to the desired temperature before it is distributed to its end use.
The differential temperature controller monitors and regulates the circulation rate of the thermal transfer liquid, based on weather and hot water demand. The expansion tank regulates system pressure as the thermal transfer liquid expands and contracts.