is in a state of saturated or slightly sub cooled liquid thereafter the liquefied basic working fluid stream with parameters as at the point 3 is divided into two sub streams having parameters as at points 4 and 5 respectively the sub stream with parameters as at a point 4 is directed into a heat exchanger he 2 where it is heated and partially vaporized by a counter flow stream of a geothermal fluid and obtains parameters as at a point 6 the sub stream of basic working fluid stream with parameters as at the point 5 passes through a heat exchanger he 3 where it is heated and partially vaporized by a counter flow stream of condensing basic working fluid see below and obtains parameters as at a point 7 the compositions temperatures and pressures of the basic working fluid at the points 6 and 7 are substantially the same thereafter the sub streams with parameters as at the points 6 and 7 are recombined forming a stream of basic working fluid with parameters as at a point 8 the stream of basic working fluid with parameters as at the point 8 passes through a heat exchanger he 4 where it is heated and fully vaporized and may even be superheated by the counter flow stream of geothermal fluid and as a result obtains parameters as at a point 9 the stream of geothermal fluid or another fluid which is the source of heat with initial parameters as at a point 30 passes through the heat exchanger he 4 in counter flow to the recombined stream of basic working fluid where the geothermal fluid is cooled providing heat for a process 8.