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37 <br />Packa ed Direct Ex ansion DX and S lit DX S stems <br />Another commonly used, low installed cost option would be the installation of packaged or <br />split DX systems similar to residential-style systems. Under this option, the refrigeration <br />equipment would be placed outdoors with ductwork routed into the building, or multiple small <br />mechanical closets would be created for air handling equipment. <br />4dvantages <br />• Low installed cost - <br />• Improved ventilation control over the PTAC system <br />• Lower energy cost than PTAC <br />• Improved temperature control over PTAC <br />• Quieter than PTAC <br />Aisadvantaaes <br />• High energy costs <br />• Increased electrical service over central systems <br />• Median useful life of 15 years <br />• High maintenance costs due to large number of refrigerant systems <br />• Low air filtration efficiency available and fixed outside air will not permit adequate indoor <br />air quality control <br />• Inadequate control over humidity due to cycling service of refrigerant systems . <br />• Noise level of equipment readily noticed in occupied space near equipment <br />An illustration of _a typical system follows. <br /> SpNt Syshm wI~ DX Cook <br />Ar•a: ~ ~,Mre III: 0.00 <br />APPS CAV arp Ai, OX 2 0p, Oar llut Typical OF. 1 <br /> <br /> <br /> ~. <br />~.~ <br />~u07up <br />r)P• ~ <br />Type <br /> <br /> <br />~12 « <br />- <br />i <br />w <br />r <br />~a• <br />~ <br />Qac Mai[ ~pe <br />G <br />Fpr S4 <br />1 DD SoKa <br />~p <br />~ <br />n <br />p <br />~ <br />a <br />0 N <br />~ <br />pa 0 JII• twrgaen AI <br />S~gpb' Fri 00 Fir Oily AIMm p <br /> _ I.c. Tamparaxra Oaaiepn TArmppr p <br /> Rll~en Smote Dat•ppr DI <br /> 8~~py Fn Red DI <br /> Svppp Srnot• Dttrdor W <br />(37) <br />