<P> This process is designed to reduce the thermodynamic losses incurred in the brine heat exchangers of the basic cycle . The losses occur through the process of transferring heat across a large temperature difference between the high temperature brine and the lower temperature of the working fluid . Losses are reduced by maintaining a closer match between the brine cooling curve and the working fluid heating curve . </P> <P> "Power is extracted from a stream of hot fluid, such as geothermal water, by passing the stream in heat exchange relationship with a working fluid to vaporize the latter, expanding the vapor through a turbine, and condensing the vapor in a conventional Rankine cycle . Additional power is obtained in a second Rankine cycle by employing a portion of the hot fluid after heat exchange with the working fluid to vaporize a second working fluid having a lower boiling point and higher vapor density than the first fluid ." </P> <P> There are numerous binary cycle power stations in commercial production . </P> <Ul> <Li> Olkaria III, Kenya </Li> <Li> Mammoth Lakes, California, United States </Li> <Li> Steamboat Springs (Nevada), United States </Li> <Li> Te Huka Power Station, New Zealand </Li> </Ul>

Advantages of binary vapour cycle over single vapour cycle