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7/30/2019 Zon Ne Boilers

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A solar water heater, how does

that work?


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Let us take the example that everyone knows,

a hose full of water for a while in the

sun. Gradually heats the water in the hose

on. We now put a glass tube around, it can

even boiling hot water. Well, the same

principle is used in a solar water heater.


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Generally you a collector of 1m , which to thesouth is directed and an inclination of 45 , about50 liters of water heating. Calculation of the totalcollector area that you need will depend on the

insolation level (climate, orientation) and thenumber of users. This calculation is part ofthe MiNi Power for study. generally assumed thatthe average person between 40 and 60 liters of

hot water per day consumed. An average familyof 4 will be a storage need of approximately 200liters and a collector ar


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In Belgium the sun at an average annual capacityof approximately 1,000 kWh per m, whichcorresponds to the energy value of about 100liters of fuel oil or 100 cubic meters of natural

gas.In a correctly sized system, we can cover up to60% of the annual energy for domestic hotwater.

Even with diffuse sunlight may be a high energyplace in the vacuum tubes. In the spring or falland even in winter there are days enough to takeadvantage of water warmed by the sun.


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Schema


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Collectors

The solar collector captures the sunlight and converts it intoheat. The collector transfers the heat to a glycol by liquid, this liquidcirculates in insulated piping between the collector and the storagetank. The liquid is contained in the collector the heat to the water inthe storage tank. The cooled liquid is then pumped back to the

collector to re-heat. We can distinguish two types of collectors:

Flat-plate collectors: the absorber consists of a black metal plateon which copper tubes are mounted. These tubes are parallel orhelically mounted. Vacuum tube collectors , the absorber consists

of vacuum tubes in glass with a black metal tube inside which aheat transfer fluid passes through.


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MiNi Power insert collectors which make use of the"heat-pipe" technique. The cream of the crop in thevacuum tube collectors.

A heat pipe is a transport mechanism that large

amounts of heat can move.In a heat pipe, there is a transport medium, which is onthe hot side evaporates, whereby the energy absorber,and act as gas moves to the cold side.Here it will condense and are heat certificates to the

condenser.This is the top of the solar collector, and then againafter cooling back to the warm side.


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Storage vessel

The storage ensures that the heat is kept until the time thathot water is needed.The hot water that you get out of this storage, isimmediately replaced by the same quantity of cold waterfrom the pipe, which in turn is heated by the heat transferfluid from the primary circuit.With sufficient sunlight in the summer, the solar collectorsto the water in the storage easily warm to above 80 C. Toburn the warm water to prevent the sanitary hot wateroutput a mixer installed. The storage tank is highly

insulated metal tank, MiNi Power uses only stainless steelvats with high density polyurethane insulation 45mm. Thisstainless steel storage tank is the reserve of hot water.


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The collector circuit

Heat transport is the responsibility of the primarycircuit. This circuit is hermetically sealed and heatinsulating and includes the heat transfer fluid. This fluidheats up while passing through the tubes of the collector isrunning, and is then diverted to a storage vessel.

again, the heat release is performed by a heat exchanger(coil pipe) in the storage tank. Here the liquid its solar alterthe sanitary water (secondary circuit). The cooled primarywater goes back to the collector where it is heated again aslong as the sun shines.

To freeze the solar fluid to prevent a non-toxic mixture ofwater and glycol. This fluid provides freeze protection to -25 C and can withstand high temperatures. This allows thesystem even in winter correctly.


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The control and pump unit

The primary fluid may circulate in different ways;

naturally (without a pump), the heat transfer fluid circulates, thanks to thedensity difference with the water in the storage vessel.As soon as thisliquid is warmer, and thus a lower density than the water in the vessel, itwill start to rise in a natural way by thermo-circulation. The vessel must beplaced higher than the collectors.

That is the principle on which the thermosyphon solar water heatersbased, which is usually found in southern Europe.

in forced manner (under pressure): a small electric pump, circulationpump, transfers the heat transfer fluid in motion when 8 C warmer thanthe hot water in the storage tank. The pump is controlled by a controlsystem that operates on

the basis of temperature differences: when the sensor of the container iswarmer than that of the collector, the system will stop the circulationpump. In the other case, the circulation pump again put in motion and theprimary fluid heats the domestic water from the barrel again.


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How the lack of sunlight catch?

In summer the solar vouch for the entire hot water production, but in thewinter or during long periods of bad weather sufficient solar energy is notonly for the production of all hot water. Therefore, most storage vesselsequipped with an auxiliary system that takes up the torch and stillguarantees the supply of hot water. This is usually done by:

a resistor (electrical assistance), which often is located at half the height ofthe storage vessel.

a heat exchanger (hydraulic support) that is connected to an auxiliarysource of heat. In most cases, is that the boiler of the central heatingsystem.

In a dual-boiler is the heat exchanger for reheating at the top of the

container. In this way, the reheating is not the whole reservoir to heat. Astorage tank with a heat exchanger is placed on the existing boiler whichthen allows for reheating.


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Specialized in the installation of solar panels,

solar water heaters with the highest efficiency

of solar energy. Price Solar. Cost solar panels

info? Installer of solar panels and solar waterheaters.

http://www.mini-energietechniek.be
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