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Tank-systems-emptying

Tank emptying facilities

The collection tank Drain Box allows to realize emptying systems innovative avoiding overheating and air inclusions in solar thermal systems that can cause malfunctions.

Drain Box allows you to empty up to 50 m² of collectors into a central collecting tank. It is easy to install by mounting it directly under the collector field. It can be combined with common type recirculation pumps. 

Il tank emptying facilities reduces maintenance costs and ensures a safe and stable operation of the solar system.

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Drain-box

No malfunctions caused by air

The degradation processes in the closed circuit of the plant form gas. These gases can cause malfunctions that can only be solved by resorting to specialized personnel and therefore extra costs and time. Air can also be created in Drain Back systems, but this does not create problems since drainage systems can work in the presence of air.

Longer glycol and plant

High temperatures in the system cause aging of glycol and lower the yield of the system. The pH of the fluid is altered becoming more corrosive to the plant. With Drain Back system, you do not have stagnation glycol, as the system is stopped collectors are empty. In this way it ensures a longer life of the plant and its components. 

Energy saving night

The system Drain Back allows also a considerable saving on electricity: during the night, in fact, it is not necessary to dispose of the excess energy, therefore, is not used electrical energy normally necessary for night cooling. 

 

How does the Drain back system function?

solar system at rest


Solar system at rest

When it is cloudy, or the plant is not in operation, 
all the fluid remains inside the tank and SolBox in the collectors are empty.

Solar system in operation

 

Solar system in operation

In the presence of solar radiation, 
the system starts automatically and the fluid is pushed into the manifolds.

Tank completely hot
 

Tank completely hot

Upon reaching the desired temperature in the accumulation or no solar energy, 
fluid flows from the collectors to the tank without SolBox evaporate.

  

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The innovative patented Drain Back protection system for solar systems prevents the system from overheating which can cause malfunctions and require the intervention of specialized personnel with a consequent waste of time and money. When the solar system reaches maximum temperature, the heat transfer fluid present inside the collectors flows into the Drain Box tank.

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The emptying also takes place in the case of the system off or at rest. In this way there is no danger that the glycol water mixture inside the collectors will deteriorate due to high temperatures. When the temperatures return to normal, the circulation pump starts pushing the heat transfer fluid back into the solar system. 

 

large plant system emptying

Drain Box with solar panels plans

A solar drainage system requires solar collectors suitable for this type of application. THE flat solar collectors FKA can be perfectly combined with a facility to drain Drain Back.

drain box Features
Surface area (m2)  0÷ 50
Capacity  40 liters
Attacks 2x1
Insulation (mm) 100
Max pressure (bar)
Dimensions H950 x ø550
Weight Kg 23

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Rossato Group Srl
Via del Murillo, km 3.500, 04013 Sermoneta LT - Italy
Share capital € 200.000,00 fully paid up - no. REA LT-107494
VAT-CF IT01745300598

Working Time
From Monday to Friday
Morning 8: 30 - 12: 30
Afternoon 13: 30 - 17: 30