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a <br />mr Steve Gatlin <br />November 161, 199, <br />Page, 3 <br />I n add i tion to investigat lang both the di relict and indirect ref rigera <br />a <br />tion s,ystlem,s we have allso compared costs and efficiencies of different <br />relfrilgerants 4MWllllllllllI R-2,2 freon, vs. ammonia. <br />investigation we are recommending the indirect system <br />Based on the 10 <br />ut iliz ing plast,l pipe, and the use of' ammonia as. the prime ref ri <br />gieran,t and a calcium ch,loride brine solution, as the secondary ref-rill, <br />g,eran,t in the rink, floors. This combination 'is much less expensiv <br />than the direct system, utilizing R-22 and steel ploping, Plastic p lop <br />cannot be uti 1, Oil zed with Ri-22,,, i <br />Tihe attached comparison sheet is provided, to show an approximate cost <br />clomparison for your ieiviewl and necesisa,ry decisions on this matter, <br />Very truly yoursIj <br />BALO sip <br />En,cs ,.I <br />