Considering both air-cooled and water-cooled equipment, the Navy is 

 estimated to be operating a total of 15,500 units that produce 397,000 

 tons of refrigeration,. Of this amount, an estimated 600 large water- 

 cooled units represent 31 „ 6% of the Navy's total intalled air conditioning 

 and refrigeration/equipment cooling capacity,, 



For cost estimating purposes, it is desirable to break down the total 

 tonnage of equipment employing air-cooled condensers in two ways„ First, 

 by severity of atmospheric conditions to which condensers are exposed, 

 and second, by the type of service, i„eo, whether the units are used 

 continuously or run only during the hot portion of the day or the year, 

 such as for comfort cooling. The former breakdown permits a more accurate 

 estimate of equipment replacement frequency, the latter is necessary 

 for meaningful estimates of power consumption and costs. The preliminary 

 ACTUP inventory results gave geographical equipment statistics by 

 Engineering Field Division which were extrapolated to yield the following 

 sub-divisions of the total tonnage estimate for air-cooled units: 



Conditions of Exposure 

 Severe Moderate Mild Total 



Installed tonnage of 14,500 62,700 4,800 82,000 

 air conditioning 

 equipment 



Installed tonnage of 25,300 143,500 20,200 189,000 



refrigeration S 39,800 206,200 25,000 271,000 

 cooling equipment 



II. MILITARY RESEARCH AND DEVELOPMENT 



The problem outlined above is not new,, It has existed and has been 

 recognized for over 20 years, changing slowly with developments in 

 materials and manufacturing technology, with increases in the cost of 

 labor for field installation and maintenance, and, most recently, with 

 the expected accelerating costs for electric power. The results of prior 

 materials sciences research and equipment performance studies by military 

 laboratories take on an added significance now because their implementa- 

 tion may effectively reduce electrical energy consumption,, 



Navy Research and Development 



Recognizing that condenser choices for selection in accordance with 

 prescribed criteria were frequently limited and that commercially available 

 equipment often failed to perform satisfactorily in severe marine environ- 

 ments, NAVFAC authorized two four-year research investigations by the 

 Civil Engineering Laboratory (CEL) , which began in 1968„ Both investiga- 

 tions are now completed., The first dealt with materials to improve the 

 corrosion resistance of air-cooled condensers and the second with a 

 two-year weathering test of three selected organic coatings which could 

 increase the long-term heat transfer coefficient of such condensers. 



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