![]() A well dimensioned solar system can provide enough energy to cover the period between May and September up to 100% of the needs for domestic hot water and from 50% till 70% annually. If there is not requirement for hot water to the facility, the solar reservoir is able to keep it warm for several days. The solar reservoir, connected to the water network has two heat exchangers, one fed from the heating medium coming from the collector and the second is connected to the heating boiler. When the hot water in the buffer is below the setpoint temperature, an auxiliary power source is getting into operation, usually the one from the conventional central heating. If there is no sun and there is need for heating, the supply is from an inactive container, called buffer tank. For example, a solar system with under floor heating, located in Crete, can cover 100% of needs for heating, discarding the oil use, while the same solar system located in North Greece, where solar radiation is reduced, the contribution rate will be significantly lower, but still, it certainly is very important in terms of reducing the fuel consumption and cost savings. The fraction of contribution and hence the reduction of fuel consumption depends on the size of the installation concerned, its site topography and other factors. The basic principle of a solar thermal system is that it is installed and operates for contributing to heating with simultaneous use of other fuels (of the existing facilities). These installations are already highly developed even in countries of northern Europe, where solar radiation is significantly lower than in Greece with a great success. In Greece, where there is strong sunlight even during the winter months, the application of solar thermal systems is very efficient. In a large percentage and depending on the facility, the water can be heated by solar energy system resulting in the reduction of the fuel consumption. In domestic applications heating the heat transfer medium is water, which is heated by burning oil or gas and circulates to radiators or floor heating. This energy is used to meet our needs in space heating and domestic hot water (DHW). on center).Solar thermal belongs to active solar systems and is the technology that utilizes solar energy to produce heat. ![]() Thicker slabs will use large spacings (12 in. on center) in thinner slabs to maintain uniform floor temperature. The tubing will usually be installed on tighter spacing (8 in. to inhibit cracking, but can be thicker due to the needs of the flooring system. ![]() With labor costs being some of the highest expense, an easy to install floor can be a cost savings. ![]() Installers staple the tubing to insulation over the existing slab or subfloor and then masons pour the slab over top of the tubing. They also allow for rapid changes in floor temperature due to their lower heat mass such that the occupants can lower the room temperatures when the room is not in use and recover quickly when occupied. The thin concrete slabs with allow for maximum heat transfer at minimum water temperatures which increased thermal efficiency and comfort. One of the most popular methods of installing hydronic floor heating in homes today is to pour a thin concrete slab over an existing subfloor and put radiant floor tubing in the thin slab. If you have an existing slab without tubing, you can pour a new thin slab with tubing over the existing slab. One of the most popular ways of getting radiant floor heating into a home.
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