About the Author: Now an independent consultant, Frederick J. Barclay (BSc, ARCST, FIEE, FIMechE, FInstP) is internationally respected for his work in the fields of the thermodynamics of power, desalination, fuel cells, and exergy aspects of combined heat and power. He has been involved in this area for many years and has a vast experience of the subject in practice. He is the author of a number of highly regarded papers on this subject.