The application fields of the solar thermal are versatile. The sun is omnipresent, at least during the day, and is available to everyone free of charge. The total amount of energy reaching the
earth's surface is more than ten thousand times higher than the energy needs of humanity. The potential of the solar thermal is greater than all the other renewable energy resources combined. A
solar plant with high-efficient vacuum isolation can help to harness this energy. You can cover your warm water needs as well as support your heating system with our solar plants. Even a whole
village can be supplied with a solar thermal local heating network. The solar system is used here as a small self-sufficient heating plant.
Due to the many installation options, our systems can be mounted on almost every building and even on the ground. You are interested in one of our solar plants but don’t know, if your home has
the needed requirements? If so, please contact us via the imbedded contact forms or just call us. We are happy to help you!
This is how a solar plant works
Solar plants collect the energy of the sun and transform it into thermal energy. The most important components of the system are the collectors, because they collect the energy through the blue
absorber plates inside every single tube. The absorber is in a complete vacuum, therefore no heat can get lost. The collectors are flown through with a heat transfer fluid (or water), which
transports the heat to the storage tank or “pool”. A solar plant can be a cost reducing addition to a conventional heating system, because most solar systems can be installed to a existing
heating very easily. Due to an installed solar plant, you can safe up to 30 – 50% of the energy costs and additionally help the environment.
advantages of a solar plant
use of renewable energies
solar plants can be used for warm water and solar heating as well
reducing of heating costs (about 50%)
climate protection due to reducing of the carbon dioxide
long life span (about 25 years)
collectors can be used as blinds
The application fields of a solar plant are various. The most known is the creation of warm water in a working household. But they can also be used for
commercial customers and those, who work in an industrial field, e.g. the solar thermal local heating supply for small villages or communities. They can be used for solar process heating in the
industrial sector. When it comes to our private customers, the pool heating is a possibility as well or the support of the normal heating system. Get to know more about the possibilities and
application fields of our solar plants by AKOTEC.
domestic water heating
Solar plants can support hot water preparation in every household. Different from the heating, the need for warm water is very constant over the year. The principal of getting warm water
from the sun is easy: The sun’s energy is collected with
a simple method: The full vacuum tube collectors. The collectors can catch the sunlight even during the winter.
What has to be kept in mind during the planning?
When planning a system for domestic water heating, the hot water demand must be estimated. If there is no ability in the household to read the hot water demand from a measuring
instrument, it can be assumed a demand of 30 l – 50 l per person and day. The demand of washing machines and dish washers should also be taken into account, because they can be
operated with hot water from the solar system to reduce the electricity consumption as well. When employing the 100° C tube, 30 tubes can always be assumed. Thus the solar coverage is
higher and there is no risk of overheating.
Alongside the hot water demand, it is furthermore essential to consider the storage type and size, because it plays an important role for the efficiency of the system. The average
size of solar hot water storage tanks amounts 300 l – 600 l. Most suitable is a buffer storage with fresh water station. Hygienic storage tanks are also reasonable, because they heat
the water in the hygienic continuous flow mode. Drinking water tanks are not to recommend to prevent the growth of legionella. Buffer storages are the cleanest and most effective
solution for a combination of domestic water heating and heating support.
What will be saved at the end?
With a high-efficient full vacuum tube collector system, it is possible to prepare hot water in the transitional period as well as in winter. So a major part of the heating costs for
the hot water preparation can be saved.
solar thermal local heating supply
Local heating networks offer opportunities of transporting decentralised energy to the consumer in residential areas, communities or bioenergy villages. They have a high efficiency with a
high level of regional value-added.
Heating systems are operating with biomass frequently, which means staff has to work at any time. And now there is the completely supply of bioenergy villages with solar thermal heat
while the majority of local heating systems were operating with biogas and biomass thermal power stations. The size of the seasonal heat storage systems plays an essential role. The
size of heat storage systems used for local heating concepts varies from 1.000 m³ – 12.000 m³.
What are the advantages?
supply of housing areas and large heat consumers
up to 100 % solar heat supply
large storages with low heat loss
realization of a non-achieved profitability up to now
energy self-sufficiency, security of supply and renewability
climate friendly, ecological technology
combination with biomass heating systems possible
energy costs approx. 80,- €
solar process heat
The use of solar energy in private houses has almost become a standard. Solar process heat is essentially needed in many industrial sectors. Despite especially large energy consumers like
agriculture and industry, that could make contribution to the energy transition restrain themselves.
Finally, the industry is responsible for approx. 70 % of the total energy consumption. The industrial sector is an attractive application area due to the proceeded low and medium
temperature processes (smaller 190 ° C). A large part of the final energy for processes can be replaced by using solar thermal systems. Process heat is applicated in sectors with high
heat requirement, e.g. breweries, industrial-scale-laundries, paint shops and agriculture. It is required for various production processes: drying, hardening, washing, rinsing,
process heat sterilizing. Process heat can also be used for sea water desalination and for cooling together with a refrigeration machine.
What has to be kept in mind during the planning?
Depending on the chosen application, there are different temperatures needed and different system dimensioning assumed. Due to that, systems for solar process heat are much larger
than heating supporting systems, there is much more space needed. Processes in low and medium temperature segment are advantageous, because the efficiency factor decreases at
increasing temperatures. Large-scale storage systems are used to avoid faults while production processes through daily or seasonal fluctuations. Obviously a conventional heating
system should be maintained to have further reserve capacity besides the storage tank. Syncing heat requirement and solar supply are optimum conditions. This is often applicable to
solar cooling or air conditioning as well as applications with daily operation.
The heating support is one of the most popular application areas of the solarthermics in private households as well as in the industry. Heating support is frequently applicated in
combination with domestic water heating. Pure heating support is an expectional case.
What has to be kept in mind during the planning?
If you want to invest in a solar thermal system you should know the exact heat demand. This may be done through the average annual demand of fuels like oil, wood and pellets or can be
calculated through the final billing of the energy supplier. Compared to solar systems for domestic water heating, heating supporting systems need larger installation areas. Pure
heating support requires on average approx. 4 m² installed collector area (20-30 tubes), depending on the above-mentioned factors. With such system you can achieve a solar coverage of
approx. 25 % – 30 %. These systems can be combined and completed with all other fuels. The heat source changes only when the demand is not covered by the collectors. The average
storage tank volume for a solar thermal heating system does not differ significantly to the usual storage tank volume for heating water with approx. 600 l – 800 l. Per m², a 100 l
storage tank volume is needed. But the storage tank systems differ in their concstruction, because storages for solar systems have to contain heat exchanger for the solar circuit.
Combined solar systems need combi storage tanks with two heat exchangers, one for the heating circuit and one for the domestic water.
What is going to be saved?
On average, solar thermal systems can save approx. one third of the heating demand annually. Especially in the transitional period, you can benefit from solar heating, because the
conventional heating system is not needed.
Is a 100% heating support possible?
If you want to heat without any additional fuel the solar system needs to be dimensioned much larger. Per m² living area 1m² collector area is needed. Furthermore, when dimensioning
the storage tank volume it should be minded that the heat needs to be stored over seasons. Another important fact is the insulation, which should be at least KfW 40 building standard.
Otherwise the complete heating of an old building would be impossible, because the heat loss would be too high due to the missing insulation.
Solar pool heating
The sun's rays that hit the earth can be converted into heat by a solar thermal system. This heat is mostly used for water heating or heating support. But it is also optimal for private
pools and public swimming pools.
A solar pool heating can extend the bathing season for outdoor pools. The heat demand with small pools can be covered. For a public swimming pool, which is used the entire year, the
solar energy is not enough to keep the wanted temperature. Especially during the season change and wintertime, is an additional heating source needed. Nevertheless, the heating costs
can be reduced enormously with a solar pool heating. You are interested in a solar pool heating system? You can request a free counseling with us!
Requests and space demands of pool heating:
A solar pool heating has only a few requirements. In contrary to the thermal solar plants for warm water heating and heating support, the solar pool heating system has to reach a
temperature of about 25°C. If you use the collectors only for the pool heating, besides two pumps and a heat exchanger, you need nothing more.
A pump is responsible for the water circulation from the collector to the heat exchanger and back. The other pump pumps the pool water to the heat exchanger. Since the pool serves as
a warm water storage tank, it eliminates the purchase of an extra normal storage tank.
The bigger the pool, the more collector surface you need. As a guideline for the size of the collector, it can be said that per gross m² of the pool surface 0.5 to 0.8 m² of gross
collector area are needed. The collectors can be used as a protection fence, installed on a flat roof, pitched roof or mounted on the facade.
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