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SYSTEMS
| Vrp | pressure reducer valve, set at 3 bars | Vg | floating valve |
| Bs | solar panels battery | Sr | atmospheric pressure tank |
| Vt | thermostatic valve | Ep | pump |
| St | thermostatic valve bulb and capillary | Pe | pressure switch |
| Df | thermostatic valve bulb and capillary |
This is the simplest and most economic hook-up, suitable for plants up to 20-30 m²; it utilises an atmospheric
pressure tank and can feed the showers by gravity; in such a case neither the pump, neither an electric connection are necessary.
It is of the type «all or nothing», that means that or it delivers hot water at the set temperature
or it does not deliver at all.
For this reason this hook-up is useful only when the hot water is demanded in connection with good weather, such as in the sea resorts.
The plant does not require auxiliary heating systems since it is utilised just in the sunny days.
The solar panels are fed directly from the mains through a Vrp pressure reducer valve, set at 3 bars.
By means of the St sensor, the Vt thermostatic valve regulates the flow and the outlet temperature from the panels; if the temperature start to rise, the valve opens to increase the flow, thus reducing the outlet temperature; on the contrary, the flow is decreased if the temperature star to decrease.
It is better that the water flow trough the panels in series, by means of the Df pierced diaphragms inserted in the panels headers; in such a way, notwithstanding the very low flows, there are not air stagnation or preferred running paths.
The water is stored in an Sr atmospheric pressure tank; a Vg floating valve blocks the delivery as the tank is full.
An Ep pump, driven by a Pe pressure switch, delivers the water to the showers; of course, if the tank can be installed higher than the showers the pump and the pressure switch are not necessary. At the end of the operative season, a protection against the frost must be provided. If the panels have been installed with a sufficient slope (almost 20°), it is possible to drain them; at the scope, the Df diaphragms are pierced with small holes to allow a complete drainage.
If, on the contrary the slope is not enough, the panels must be dismounted, as normally happens in sea resorts, or also filled with a brine of water and sodium chloride that prevent the freezing down to -20°C.
It is of the type «all or nothing», that means that or it delivers hot water at the set temperature
or it does not deliver at all.
For this reason this hook-up is useful only when the hot water is demanded in connection with good weather, such as in the sea resorts.
The plant does not require auxiliary heating systems since it is utilised just in the sunny days.
The solar panels are fed directly from the mains through a Vrp pressure reducer valve, set at 3 bars.
By means of the St sensor, the Vt thermostatic valve regulates the flow and the outlet temperature from the panels; if the temperature start to rise, the valve opens to increase the flow, thus reducing the outlet temperature; on the contrary, the flow is decreased if the temperature star to decrease.
It is better that the water flow trough the panels in series, by means of the Df pierced diaphragms inserted in the panels headers; in such a way, notwithstanding the very low flows, there are not air stagnation or preferred running paths.
The water is stored in an Sr atmospheric pressure tank; a Vg floating valve blocks the delivery as the tank is full.
An Ep pump, driven by a Pe pressure switch, delivers the water to the showers; of course, if the tank can be installed higher than the showers the pump and the pressure switch are not necessary. At the end of the operative season, a protection against the frost must be provided. If the panels have been installed with a sufficient slope (almost 20°), it is possible to drain them; at the scope, the Df diaphragms are pierced with small holes to allow a complete drainage.
If, on the contrary the slope is not enough, the panels must be dismounted, as normally happens in sea resorts, or also filled with a brine of water and sodium chloride that prevent the freezing down to -20°C.
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Janus Energy srl Via S. Filippo, 2 - 60044 Fabriano (AN), Italy Tel +39.0732.625722 - Fax +39.0732.628680 Email janus.energy@sunnyday.it |
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