The paper presents the results of research work on the effective use of solar collectors which was realized in the solar energy testing polygon at the Institute of Physical Energetics. A certain proportion of the energy generated by solar thermal system is spent as the heat losses in pipelines between the solar energy absorbing device and the heat-accumulation tank. Insulation of solar thermal system's pipelines is necessary for both outdoor and indoor pipes. Outdoor heat pipes insulation reduces systems heat losses outside, while, indoor heat pipe insulation reduces value of unnecessary energy distribution inside in the summer period. The dependence of pipelines heat losses from the pipelines insulation type has been determined with the PolySun simulation program. The most popular heat pipes insulation materials in Baltic region were examined and compared. The results of comparison were summarized in graphic form taking in account the thermal conductivity coefficient and the prices. The amount of absorbing energy values and heat losses have been calculated and presented in the graphical form. As a result the method for determination of the most effective insulation types for solar thermal system's pipelines has been developed.
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