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The Leidenfrost article develops design procedures for evaporative condensers by means of detailed analysis and computation of the state changes of the air passing through a wetted and partially wetted plate-fin-tube type condenser coil. Our sponsor had requested an air-cooled condenser or a better condensing system than is ordinarily used. The Herrick Laboratories has answered the challenge to use a more efficient condensing medium. There will still be air-cooled condensers for residential applications, and an evaporative condenser replacing a Utility Power Plant 450 ft high atmospheric cooling tower cannot be visualized. But in this energy conserv ing area we are moving into, the evaporative condenser will be considered for the first time in a new light. This is almost completing the circle for me. Twenty-five years ago I was crisscrossing our country promoting air-cooled equipment for residential and commercial applications. There were advantages in lower maintenance over cooling towers but I did not foresee the closer fin spacing and no condenser cleaning whatever until the unit shuts off on high head pressure. So— to use a commercial phrase—"We found a better way." Professor Leidenfrost has explored the basic principles to develop the several curves that are traced out from the calculations of evaporative cooling of con densers without the data being developed from tests. His presentation develops design procedures for evaporative condensers by means of detailed analysis and computer computations of the state changes of the air passing through a wetted and partially wetted plate-fin-tube condenser coil. The full explanation would require that Professor Leidenfrost do it himself, so if there are substantive questions I'll get answers from our two graduate students, Korenic and Lee. Professor Leidenfrost's analysis challenges our interest because like most of energy conserving concepts it requires a larger capital investment to use an evaporative condenser than a traditional cooling tower with the shell and tube condenser. B-2 3PDF Image | Development of the Zinc-Chlorine Battery for Utility
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