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3. Smaller Refri�erant Charge. A plate and frame chiller system takes approximately 50% <br />ofthe ammonia charge as a shell and tube type system. This not only saves money <br />during the initial installation biit also rcduces the cost of replacing the refrigerant if a leak <br />occurs in the system. <br />The disadvantages of a plate and frame type chiller system is that it is less durable and requires <br />m� maintenance than a shell and tube type chiller system far the following reasons. <br />1. The plates are mare susceptible to sediment build up because ofthe system's design. <br />2. There are gaskets located between each plate that will require replacement some time <br />during the equipments life span. The cost far a set of gaskets far each plate and frame <br />unit ranges from $7,000 lo $10,000. The manufacturer could not state the average <br />number of gasket sets required over the life of a typical chiller unit. <br />Plate Material Options <br />The most common material used in plate and frame chiller when calcium chlaride is as a <br />secondary refrigerant is stainless steel. Vilter manufacturing said they have never sold a vessel <br />with titanium plates and stated titanium is approximately 1.5% less e-�icient in iransferrii�g heat <br />than stainless steel material. Titanium material would be rr►ore resistant to corrosion than stainless <br />steel. A cost comparison of the two materials is included in the table below. <br />The life expectancy of a plate and firar�e chiller is approximately equal to the shell and tube <br />chiller with proper maintenance. <br />Cost Estimate for Plate and Frame Option <br />The estimated cost to install a plate and frame chiller system in place of the existing chiller <br />system includes in general demolition of the existing shell and tube chiller and receiver, Iwa new <br />plate and frame chiller packages, one new vertical high pressure receiver, evacuation and <br />replacement of existing arnn�onia refrigerant, and complete replacement of the brine or rink <br />pumps. Cost estimates are presented for two types of plate materials, stainless steel and titanium, <br />'I'�t�lc �:t. �:��1 }.�s:�r.:r,�� jc,r L'Inie <�ricl I��nm� �l�ticxra 5,� - StainJ��s �tt�[ PIK'.cs <br />�-• -- • --- • -• • - <br />IJt�m - -- � -� i�aa�f <br />R! u�c and Frnr�� L"Li I I�r P3cks e�, -- -- --. .--����E,000 � <br />_}ctch�� � �;� stcer� tiv irh 4'.�� I �.— — -- -- - — _ Si�,3 0� <br />� �Lh,� r e lh� �ti��:[�:� w�tl� ainn�r�ia rc�ri rar�i � w.l]lifi <br />� I c:'nl ]=s-iir al��d C'ons�r�ti�si� ['ascs _ _ . _ $� �' ll_I�U�I <br />' Es�, m��c, C]rs��, �� �J �'c��ivltu�.�ti�7� C:.��,i i�i�n�� ��Q°fa�* I ��}�.�15�7. <br />Tr�i�l f x1,n�arrcl c�� ��stnictt�n �ucs�s. _. .. _ $ 3'��i, lillfl . <br />lin�,�t e� i r. e. I�e�:t'. nn� :��iri in i�c-aeG4��-�9'0� -- }�%4,1 L7U <br />To��] ��ti fi n��lY� ly ria]C4"[ �'iM%I7� _ �,. � _ .. �SS,��(1 � <br />�� <br />