No abstract

The impact of climate change on operation of the largest Russian hydropower cascade was addressed. A coupled climate-hydropower simulation was fulfilled assuming a model of the cascade taking into account the real dynamics of the hydro-engineering system. An ensemble approach was applied to CMIP5 climate simulation data using the models' discrimination based on a validation procedure. It has been found that the projected climate change will make a noticeable impact both on the annual power generation amount and the guaranteed power generation capacity. The found evidence should be taken into account when developing new rules of water resources use for the hydropower plants reservoirs.

Detailed data on incoming solar radiation are needed in the design of solar energy systems of any scale: from large PV plants to small off-grid systems. However, in most cases, obtaining data on measurements of solar radiation is connected with difficulties due to financial or technical restrictions. Often, ground-based measurements of solar radiation are either not carried out at all or only the value of the global horizontal intensity of solar radiation is measured. The aim of the present study is to review and to verify some existing empirical models of the global solar radiation and its components for the climatic conditions of Kyrgyzstan as well as to estimate the applicability of Meteonorm database model for the available solar radiation in the territory of Kyrgyzstan. The necessity to select the most suitable models of the solar radiation is called by the lack of similar studies on this direction for the conditions of the country.

In the Republic of Venezuela, the government adopted a development program of power supply of the population on the basis of solar energy use. Therefore an urgent task is to determine the structure and parameters of scheme of power supply, and also to evaluate the efficiency of use of different types of solar modules for the conditions of the country. The purpose of this paper is to analyze the efficiency of silicon solar modules and solar modules with a holographic concentrator, each with and without water cooling systems, in the operational conditions of the area Alta Guajira in the Bolivarian Republic of Venezuela. The paper presents the study results of the effect of the cooling system on the characteristics of the holographic and conventional solar module.