Coal, Gas

Dry Cooling

Issue 4 and Volume 106.

The column on dry cooling in the October issue of Power Engineering (“The Hot and Cold of Dry Cooling”) is most interesting, revealing and timely. As a power plant design engineer, this is a subject matter that I have devoted nearly 50 years of my professional life to. I have been saying for 50 years that the acceptance of dry tower application in the power field is “just around the corner.” The article shows that technology advances have brought it only a few steps away from its full acceptance.

I published an ASME paper in July 1976 titled “Dry and Wet-Peaking Tower Cooling Systems for Power Plant Application,” [which discussed how to minimize] the loss of plant output capacity in hot weather even when using conventional steam turbines. The article brings us all up-to-date, saying, “steam turbines are now available that can accommodate higher back-pressures than the older turbine models.” The steam turbine manufacturers resolved an inherent system problem by designing a new low-pressure steam turbine specifically to meet the needs of the dry tower market.

I was pleased to read that the renowned Dr. Kroger of the University of Stellenbosch recognizes the favorable economics of the “newer single-row finned tubes.” It’s not only lower cost, but it also is more freeze-proof in cold climate installations.

Congratulations on a job well done!

Michael W. Larinoff
Oldsmar, Fla.