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2. PROJECT OBJECTIVES a) The project required developing and costing out a complete bill of material for a centrifugal chiller system to cool the liquid in the process to conditions that were not ideal as to the maximum efficiency of the cooling equipment (see Figure 1). b) The project required an investigation of air-cooled vs. water-cooled condensers. Professor Leidenfrost pointed out there were opportunities to improve efficiencies of the condensing -operation by lowering condensing temperatures through a more efficient heat transfer. The economic pressures to reduce power- kw/ton or EER forces us to consider an evaporative condenser. Consideration of an air-cooled condenser had posed many tubing and piping connections that would be hazardous because of their multiplicity. In our judgment we would be pyramiding a development on a development to use anything other than aconventionalcoolingtowerwiththewatercooledcondenser. TheLeidenfrost concept of continuously wet heat transfer surfaces would minimize the scale and mineral deposits which are a problem with condensers cooled with cooling tower water on the inside of the condenser tubes. Where cooling towers are to be used, the build-up of scale in the condenser tubes is a continual maintenance problem and dependent upon water conditions can be critical in many areas of the country. 3. ANALYTICAL PROGRAM INITIATED The opportunity to investigate this imporved heat transfer process is a challenge that, while it may not be available in the initial pilot installation of the load leveling process, it may become a vital part of the installations that would be made later on after the initial phases have been perfected. 4. MODELING OF A TUBE AND PLATE FIN TYPE EVAPORATIVE CONDENSER FOR WETTED, PARTIALLY WETTED AND UNWETTED OPERATION_________________________________ A "blow-through" type evaporative condenser unit is shown in Figure 2. The heat exchanger consists of a tube and fin coil, 8 fins per inch, through which the refrigerant is channeled. Water is supplied by spray nozzles to the top of the heat exchanger and flows under the action of gravity downwards and is collected in a reservoir. Air enters the bottom of the coil, flows by forces convection upwards and leaves the top of the unit. The water is recirculated and replenished to the amount evaporating during the cooling process. B-3PDF Image | Development of the Zinc-Chlorine Battery for Utility
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