Abstract
Considerating that the energy resources can be found in limited quantities and are not renewable, the most efficient and technically sustainable for heating the soil in early spring or late autumn in a greenhouse for vegetables is to use the solar energy. A heated greenhouse for vegetables is useful because the vegetation process can start more early or can continue later for can obtain several crops throughout the year. The paper presents theoretical researches accomplished for development an system of ecological heating in a greenhouse covered with a tough polyethylene wrap with triple layer. The heating system contains solar panels with heat-pipe vacuum tubes and an installation for heating the interior of the solarium using hot water hot air heaters, which adds more heat.
Highlights
In Romania, studies have been carried out to increase the energy independence of greenhouses with small dimensions, for example, the use of a TLUD gasification system, which uses the energy potential of agricultural residues [1]
Due to the fact that the use of systems for the production of hot water is made with high costs, the most often used heating system is the one that uses flat solar collectors because it is simple and economical [3]
The researchers have emphasized the use of solar energy in the technical applications for heating greenhouses and solariums, due to the high storage performance and the efficiency of its conversion [4]
Summary
In Romania, studies have been carried out to increase the energy independence of greenhouses with small dimensions, for example, the use of a TLUD gasification system, which uses the energy potential of agricultural residues [1]. Researching to account the requirements of efficient use of solar collectors that have a high percentage of solar radiation which reaches on that surface and transforms into thermal energy, INMA Bucharest has designed an experimental model of system of ecological heating needed of an agricultural farm that uses energy solar for the contribution of heat for the purpose of heating a vegetable solarium in order to grow crops during the cold time of the year (October-December and February-April). The installation for producing heat supply uses two solar panels with 30 vacuum heatpipe from copper of 24 mm Sontec SPA 30 58/1800, which are the most efficient in terms of capturing solar energy because the borosilicate glass layer and the vacuum inside has the role of giving a 96% efficiency (solar energy falling on the panel, compared to the energy captured by the panel). These panels can provide 70-80% of the heat input in the cold season [10]
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