This paper presents the results of an experimental study of the hydrodynamic process of a solar collector water-heated floor system. The water-heated floor system is designed to heat living rooms. Based on the analysis of the structures of the hot water floor, methods of their installation and the methodology of hydrodynamic calculation of the hot floor, experimental studies were conducted on the total pressure loss in the pipes of the hot water floor and the pump power used to transfer hot water from the pipes. Experimental studies were carried out in laminar and turbulent flow regimes at different diameters and different positioning steps of the water-heated floor pipe. The results of the hydrodynamic process study showed that the pressure drop and pump power were the highest at the pipe diameter and pipe pitch of 12 mm and 100 mm, i.e. 8 kPa and 18.5 W in the laminar mode and 14 kPa and 210 W in the turbulent mode. . Results obtained as the pressure loss and the power consumption of the pump decrease with increasing pipe diameter and positioning pitch ΔP = f(Re) and N = f(Re) presented in the form of a dependency graph.
Today, increasing energy efficiency in residential heating systems, saving fuel and energy resources, and improving the efficiency of using devices based on renewable energy sources is an urgent issue. The purpose of the article is to develop a mathematical model of the heat balance and conduct a theoretical study of one-story rural houses based on the use of solar energy in a non-stationary mode. To achieve this goal, an experimental one-story solar house with autonomous heat supply was built. The heat supply of the experimental solar house mainly uses solar energy, and when the heat supply load exceeds this load, the traditional boiler device is used. The power supply of the experimental solar house is provided by a solar panel (photovoltaic converter). A heat balance scheme for a solar house with autonomous heat supply and an electrothermal scheme of a physical model are proposed. Based on the proposed schemes, a mathematical model of heat balance and a calculation algorithm based on the heat balance equation of the dynamic state of the heat supply system of a one-story experimental solar house in a non-stationary mode have been developed. On the basis of mathematical modeling, the influence of the heat capacity of the wall structure on the temperature regime of the building was studied. On the basis of the MATLAB-Simulink program, the main temperature characteristics were built, on which the change in the temperature of the internal air of the building was analyzed depending on the ambient temperature. On the basis of the program, a modular scheme of the dynamic model was built. Based on the modular scheme, the results of the experiment on changing the air inside the solar house and the outdoor temperature are presented in the form of a graph. The mathematical model of the thermal balance of the building in dynamic mode and the obtained calculation results are recommended for use in the development of energy-efficient solar houses.
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