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Abstract. The paper considers the technique of hybrid concentrator solar plants developing with a new design that increases the optical concentration ratio and utilizes additionally diffuse solar radiation. The circulation of heat carrier passes in divided PV modules and thermal collectors circuits on a common carrier platform with the implementation of resetting heat in a counter flow mode in the linear heat exchangers. Described data experiments and calculations of specific performance of electric and thermal energy for different concentration ratio and at different installation latitudes as well as the cost of energy production calculations.

This chapter is focused on solar cogeneration systems. These systems are silicon unijunctioned photocells with an optimal combination of the value of solar radiation concentration ratio and solar cell cooling intensity within the laminar flow of the coolant. This is based on the balance of the power which is released by the photocells, into the electrical and thermal network and dispersed into the environment. There is an engineering method for calculating the annual productivity of linear photovoltaic panels presented. The principles of designing solar radiation concentrators and photovoltaic panels is also considered. A fundamental new technique for testing linear photovoltaic panels with a sun concentration is proposed. This is when the absolute temperature of the radiating surface is logically introduced and a difficultly determined parameter is excluded, taking into account the temperature distribution along the surface of the absorber, from the location of the coolant.

Transportation of highly viscous and high-curing oils through main pipelines requires significant energy costs. Thus, the task of choosing the cheapest pumping modes is very relevant. The article describes and proposes a solution to the oil flow problem in a pipeline using two methods: with preheating and using a Laval nozzle at the inlet of the pipeline. Mathematical models of the flow of highviscosity oil in the main oil pipeline for the two named pumping methods have been compiled. An algorithm has been developed for calculating temperature, viscosity and pressure along the length of the Uzen-Atyrau pipeline at various oil flow rates. The results of temperature and pressure distribution are analyzed and compared at different oil flow rates along the length of the pipeline for two pumping methods. It is shown that the use of cavitation improves the rheological properties of oil and can significantly reduce the cost of pumping. The research results can be used to predict the operation of main oil pipelines pumping oil both in a heated state and in isothermal mode with a Laval nozzle.