Calculation of the heat engineering characteristics of a combined system of a vegetable storage facility and solar greenhouse

Mathematical modeling of greenhouse-livestock complex heated by solar and bioenergy sources

“…In the development of the mathematical model, we construct a block diagram (figure 2) in the MATLAB/Simulink program, expressing all the magnitudes of the equation in table 1, without taking into account the change in air density and specific heat capacity over temperature [14]. As can be seen from the graphs of figure 3, even though the outside air temperature is 6 0 C, when the total solar radiation is 500 W/m 2 , the indoor air temperature rises to 22 0 C, the water tank battery temperature to 13 0 C, and the underground heat accumulator temperature to 17 0 C can be seen.…”

Improving the energy efficiency of a solar air heater with a heat exchanger – accumulator

“…One of the most important issues is research aimed at increasing efficiency and developing new modern structures, as well as improving their heat calculation methods. At the same time, it is important for the heat supply system to accelerate the heat exchange processes by turbulizing the airflow and increasing the efficiency of solar air collectors based on an improved absorber design [2][3][4][5][6].…”

“…The Strategy of Actions for the Further Development of the Republic of Uzbekistan, in particular, sets the tasks of "Reducing the energy and resource capacity of the economy, the widespread introduction of energy-saving technologies in production, the widespread use of renewable energy sources." Based on these priorities, one of the most important tasks of solar energy is to increase the efficiency of solar air collectors in air heating systems, to optimize their basic parameters, to study the processes of conversion of solar energy into thermal energy [4][5][6][7]. An analysis of world scientific achievements in the field of increasing the efficiency of solar air heaters showed that to increase the productivity of heaters, designs are proposed: using different geometry of the surface of the absorber plate to increase the heat transfer rate; development of a solar air heater with and without materials for heat storage (for example, with a phase change); hybrid photovoltaic and solar collectors that produce both thermal energy and electricity at the same time.…”

Removal of hydrodynamic lesions of a heated floor with a solar collector

“…Based on the above, one of the current challenges is to meet the demand for heating of rural houses without significantly increasing the demand for thermal energy in winter. Currently, the main tools to solve this problem are the use of renewable energy sources [5][6][7][8][9][10][11][12][13], efficient heat storage [14][15], the use of water-heated floor systems [16][17] and so on.…”