Increasing the efficiency of solar greenhouses with heat accumulator

The questions of effective conjugation of indices of enclosure coefficients and thermal accumulation of a solar greenhouse as a function of geometrical parameters and solar radiation input are considered. Greenhouses are the most energy-consuming structures, with theincrease in energy prices, the urgency of improving their thermal performance increases. The efficiency of a solar greenhouse is determined by its ability to accumulate the heat of solar radiation energy. The main geometric and energy characteristics of solar greenhouses are the enclosure and heat storage coefficients. The solar radiation gain depends almost little on the angle of incidence of rays on transparent surfaces, it depends mainly on the surface area of the transparent enclosure. For the conditions of Kashkadarya province the most optimal is 60o. The angle of inclination of the upper southern slope is accepted within 25o...50o. The heat transfer coefficient through the enclosures, indoor and outdoor air temperatures do not depend on the slope angle. The analysis of the obtained results showed that allows: as an optimal variant of the geometry of helioteplitsa can be recommended parameters - span width 6 m; -length of the greenhouse 25 m; -height of supporting structures 2.2 m; -angle of inclination of the lower southern slope 60o; -angle of inclination of the upper southern slope 30o. The amount of heat stored in a thermal accumulator is determined by its heat storage efficiency: material, ability to absorb solar radiation, volume, location. With sufficient mass values of the thermal storage elements, all or almost all of the solar energy captured by the thermal storage elements is utilized, overheating in the greenhouse is eliminated, and daily air temperature fluctuations in the greenhouse are smoothed out.