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Abstract-The experimental research of intensity of a thermal stream and distribution of temperatures on ribbed pure and low-purity surface of the tubular ridge convector with spiral aluminium ribs is spent at air free convection. Researches were spent by a method of full thermal model testing at specially developed experimental stand, and ring uniform pollution ribbed tubes was created by dense winding between ribs of a linen cord or wrapping of tube by an aluminium foil.

It is revealed that at a free convection in tubes with a close arrangement of ribs of pollution of intercostal space at the basis ????????? does not lead to essential decrease in a heat rating (less than 10 %), and the decline to give heat properties of a tube occurs only at pollution of cops ribbed (on 20,5 %). The temperature on altitude of a lateral surface of a rib decreases slightly (less than 2 %), and on a rib cop in relation to the basis -for 6-9 %. Hence, at maintenance of ridge convectors of systems of heating their frequent and careful clearing of pollution is not obligatory.

Keywords: bimetallic ribbed tube, convector, pollution, heat rating at air free convection. ???????? ???????? ????? q, ??/?, ?? 1 ? ???????? ????? ?????????? ?????????? ?? ????? ? ??????? ?????????? ? ??????????, ????????????? ?? ????????? (t ? -t 0 )/q,?? 0 ?/?? h,?? W=10,3 ??;

???. 4: ??????????? ?????????????? ???????? ??????????? (t ? -t 0 ) / q ?? ?????? ????? h ??? ?????? (h ? = 0), ???????????? ??????? ?????? ? ? ??????????? ???????? ? ?????????? ????? ? ??????? ??????????? h ? ? ???????? ????????? W: