Vasylykha K. Improvement of the normative and technical basis of tests of solar converters

Thesis is devoted to improving the normative and technical support of testing of solar converters. The methods to improve the thermal test radiometer with electric substitution and determine the efficiency of solar collectors are proposed. To improve the performance specifications of such equipment, it is proposed to use highly sensitive semiconductor sensors. Based on experimental studies, planar transistors are chosen and sensors that can be used in temperature channels of devices for solar system studies are designed. Series connection of several transistor diodes enables an increase in sensitivity while reducing technological variations and simplifying secondary devices. The structure of a digital temperature difference meter with the studied sensors is designed. The meter calibration at any temperature in the measuring range while ensuring the temperature uniformity of both sensors is proposed. A method for adjusting a nonlinear error component in the whole measuring range is developed. It is based on determining the parameters of sensors approximating dependencies using experimental data. The logarithmic approximation temperature dependence of semiconductor sensors, whose value is equal to zero at both calibration temperature values is proposed. It is shown that this approximation dependence can be easily implemented in the modern microcontrollers base. The method of testing solar converters for determining the thermal characteristics in closed rooms with the use of solar radiation simulators and radiometers with electrical substitution is improved.