Abstract: The invention relates to a heat transfer element and an arrangement using such an element to lower the temperature of solar cells. The heat transfer element is arranged to be placed on the shadow side of and in contact with a panel of solar cells and configured for collecting heat from the solar cells, said element comprising an inlet, an outlet and a internal passage extending between said inlet and said outlet and being arranged to guide a heat transporting fluid. Also the passage is defined between two generally parallel sheets. The arrangement comprises a heat transfer element arranged to be placed on the shadow side of and in contact with the panel and a system feeding a heat transporting fluid to said inlet and receiving the heat transporting fluid from said outlet.

Abstract: The invention relates to an heat exchanger element of a plate type, with one internal flow passage, comprising two plates defining an inlet, an outlet and an internal passage extending between said inlet and said outlet, whereas said passage is between two generally parallel plates of self supporting polymer material. The present invention also relates to the use of such an exchanger element as collector in a solar energy arrangement, as chilled beam, as hear distributing element, as subterranean collector, as exchange element in industrial processes and as heat absorber in arrangements for cooling electrical components that are negatively affected by being close to elements having electrical conductivity.