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, <br />i <br />? <br />r. <br />� <br />�; <br />F. <br />� <br />1 t] <br />11 <br />1� <br />13 <br />1� <br />� 4 <br />1� <br />1� <br />l� <br />1� <br />2 v� <br />�] <br />�� <br />�� <br />2� <br />�� <br />�� <br />� �: <br />��s <br />�� <br />'� r <br />�.7 <br />�_ <br />�i <br />�3 <br />_�i 'e <br />�, C <br />�� <br />�,� <br />�i F <br />�� <br />� �, <br />�1 <br />�� <br />�� <br />�� <br />�5 <br />Disadvantages <br />. Uses approximately 6000 Ibs. of R22 refrigerant (ozone depleting <br />hydro fluorocarbon) <br />. R22 to be phased out in 2020 — R22 will no longer be produced <br />. After 2020, the only R22 available will be recycled or reclaimed — <br />become very expensive <br />� Steel (rolls) availability has been limited or not available at all <br />• Use of compressors that are 35+ years old (well maintained) <br />3- Indirect Refrigeration — Full Replacement <br />Advantages <br />* All components readily available <br />• Multiple secondary refrigerant options (brine, ethylene glycol, <br />propylene glycol) <br />. All components have been replaced — new components have 25 <br />year useful life <br />. Environmentallyfriendly primary refrigerant choices <br />Disadvantages <br />. Ethylene Glycol is not environmentallyfriendly if leak occurs <br />. Ethylene glycol approximately 20% less efficient to operate than <br />direct system <br />. Propylene glycol approximately 50% less efficient to operate than <br />direct system <br />4- Indirect Refrigeration— Partial Replacement <br />Advantages <br />• All components readily available <br />. Two most vulnerable components (floor and cooling tower) have <br />been replaced <br />• Multiple secondary refrigerant options (brine, ethylene glycol, <br />propylene glycol) <br />. Environmentallyfriendly primary refrigerant choices <br />Disadvantages <br />• Use of compressors that are 35+ years old (well maintained) <br />. Replacement parts for compressors is becoming limited which <br />increases cost and potential for extended down time <br />