Patent ID: 7013963

Claim:
A method for improving heat transfer in a circular plate heat exchanger ( 1 ) composed of circular heat transfer plates ( 10 ), in which method the heat transfer takes place between solid, gaseous, liquid or corresponding heat transfer media flowing in the spaces between the heat transfer plates ( 10 ) in the circular plate heat exchanger ( 10 ), which comprises, in addition to a housing ( 3 ) used as a frame ( 2 ), also a stack ( 6 ) of plates composed of circular grooved heat transfer plates ( 10 ), in which stack heat transfer plates ( 10 ) are provided, in their central part, with central holes ( 16 ), from which the stream of one heat transfer medium is guided to the spaces between the plates, radially in respect to the heat transfer plates ( 10 ), or the heat transfer plates ( 10 ) are provided with holes ( 11 , 12 ) on opposite sides, from which the stream of one heat transfer medium is guided to a flow in the direction of the perimeter of the circular plate heat exchanger ( 1 ), the heat transfer plates ( 10 ) are provided with holes ( 11 , 12 ) on opposite sides, from which the flow of one heat transfer medium is guided to a flow in the direction of the perimeter of the circular plate heat exchanger ( 1 ), and the holes ( 11 , 12 ) on opposite sides of the heat transfer plates ( 10 ) and the central hole ( 16 ) constitute the inlet or outlet passages for the heat transfer media, characterized in that to improve the heat transfer, the grooving ( 18 ) of the circular heat transfer plates is arranged in such a way that the heat transfer medium is guided in a flow in a direction of its radius, primarily along partly curved evolvent graphs or modified evolvent graphs, whereby the heat transfer coefficient of the heat transfer medium of the flow in the radial direction of the circular plate heat exchanger ( 1 ) is maintained or increased when moving in the radial direction to the outer perimeter ( 13 ) of the heat transfer plate ( 10 ).