Protection of solar water heater during the summer months

Protection of solar water heater during the summer months

Solar water heater

Generally

What makes a high-quality solar water heater stand out is not as many wrongly think of the number or size of the collectors but the choice of the right collector type and size to achieve a balance between the collector and the boiler.

A solar water heater with a very large collector surface will work well in the winter but will cause overheating problems in the summer due to the excess energy absorbed by the collectors.

A solar collector with a high-quality collector typically has a single collector so that the solar system performs well in the winter (due to the very good insulation of the collector) without overheating the water in the summer.

Even the most balanced solar system will raise very high temperatures when there is no water consumption during the summer months when we are out for a few days from home for our summer holidays.

In those days, the solar water heater continues to collect solar energy without having a corresponding consumption, with the result that our solar water heater is growing at very high temperatures.

The high temperature which can exceed 100 ° C depending on the type and quality of the solar has a number of very negative consequences, such as:

A great increase of salt deposits inside the boiler.

The salt deposit inside the appliances with which hot water is in contact is proportional to the temperature of the water. The higher the temperature, the higher the rising rate. Therefore, when we leave the house in the summer and grow in our solar temperatures of 100 ° C, the precipitation of salts is accelerated dramatically. The large scale but in turn has the effect of reducing the efficiency of the solar water heater and reducing the useful volume of the boiler.

Release the water from the closed circuit from the safety valve of the solar water heater.

The high-temperature increase results in an increase in the pressure inside the solar boiler. When the pressure in the container exceeds the nominal pressure of the safety valve, the safety valve opens to relieve the pressure by removing water from the closed circuit. When the temperature reaches permissible levels, our solar does not work because the water in the closed circuit no longer closes “circuit” and circulates to transfer the heat from the collector to the boiler.

The inability to transfer energy from the collector has, in turn, the thermal stress of the collector and the reduction of his life.

A danger of cracking of the solar glazing.

The above-mentioned combination of high pressure and temperature, in addition to the consequences mentioned above, also stalls the enamel of the boiler to such an extent that the glazing can crack, resulting in a dramatic reduction in the lifetime of our solar heater.

Destruction of safety valves.

Continuous operation of the safety valves results in salt deposits in the valve seat, leading to premature destruction of the valves and further deterioration of our solar status.

Reduce the life of the protection anode.

Strong salting increases the consumption rate of the anode, resulting in a reduction in its life.

Increase maintenance costs.

It is obvious that all the above-mentioned consequences of overheating increase the maintenance cost of our solar heater.

Apart from the early wear of our solar water heater, the high pressure inside the boiler lures the entire water supply network of our home (piping, valves, spirals, batteries, etc.), while the high temperature endangers the same our health, since hot water can cause serious burns if our body comes in contact with water at a temperature higher than 70oC.

Protect our solar water heater

So to protect our solar water heater from the above-mentioned adverse effects, it is important to cover the solar collector when we leave our house in summer for many days.

Proper coverage is done with special reflective collector covers designed to reflect most of the solar energy safely applied to the collector without risking being swept away by possible winds and easily stored when not in use.

Conclusions
  • Even high-quality solar water heaters, it is unavoidable to increase the temperature inside the boiler when we are missing for days from home during the summer months.
  • The high temperature of our solar water heater may result in a cessation of operation, reduced performance, reduced life, and at the same time jeopardizing our health.
  • We can protect our solar water heater, our hydraulic installation, and our health by covering our solar panels in the summer months that we are missing for several days from home.

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