Appendix 



COST EFFECTIVENESS 



By Richard A. Boettcher 



A short investigation was undertaken at CEL to develop a parametric, 

 life-cycle cost analysis to include the necessary decision factors. 

 The objective was: first, to make possible a decision on whether or 

 not there is promise in coatings for air-cooled condensers of Navy air 

 conditioning equipment; and second, if cost-effective, to develop a 

 plan of action for CEL production of recommendations to NAVFAC on 

 specifications or design criteria, as appropriate. The investigation 

 included: (1) inquiries regarding equipment or maintenance; (2) inquiries 

 of 11 equipment manufacturers and 5 coil fabricators, coil coaters, and 

 suppliers of metal finishing products; (3) review of previous research 

 on coil materials, coatings, and finishes; (4) an estimate of existing 

 tonnage in Navy mechanical cooling installations; (5) determination 

 of dominant cost elements and appropriate cost estimating methodology; 

 and (6) preparation of a comparative life-cycle cost example. 



A life-cycle cost example follows" and was developed to compare 

 the cost effectiveness and energy-to-cost ratios for three condenser 

 coils representing successively higher levels of performance over the 

 current industry standard. The results of this analysis show that coil 

 performance enhancement can be justified economically at all Navy 

 locations where mechanical cooling is required or permitted."" A 

 continuing research effort to produce definitive design criteria and 

 purchase specifications for such higher performance, air-cooled refrigeration, 

 and air conditioning condensers is clearly indicated and is recommended. 



"Copy of " Pay-Out and Energy/Cost Ratios ; Comparative Example of 

 Coated Heat Exchanger Applications," by Richard A. Boettcher. 



■^Locations like Charleston, S.C., are possible exceptions because 

 of the shorter and less severe cooling season, moderately corrosive 

 atmospheric conditions, low power costs, and relatively low cost of 

 construction and maintenance; all of which combine to produce the 

 operating conditions for which present commercial designs of packaged 

 equipment appear to be optimized. 



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