Document 3QrLVaMXqkaQOwgYzo0Nj972x

Heat-Surface Fan System Aerofin Corporation 850 Frelinghuyeen Avenue Newark, N.J. Manufacturers of Standardized, Light-Weight, Fan System Heat-Surface 39 Cortlandt Street NEW YORK Land Title Building PHILADELPHIA Burnham Building CHICAGO Oliver Building PITTSBURGH Paul Brown Building ST. LOUIS United Artists Building DETROIT Aerofin AEROFIN is the modern standardized, light-weight Fan System Heat-Surface developed by Fan Engineers to meet the present-day requirements of this highly special ized held and to afford an adaptability which permits the new and advanced applications of tomorrow. AeroWn, Aiffsm., AerofTn AEROFIN is built in three distinct types: AerofTn, tube-plate construction, for pressures up to 50 lbs. gauge; Ae'rOFTn, continuous seamless tubes, multiple-coil construction, for pressures from 2J^ to 150 lbs., gauge; and AeRcFiTn, continuous seamless tubes, for pressures frorti 25 to 350 lbs. gauge (Temp. 500 F.) Design and Construction The heat-transfer surface, in AeROFIN, is a plurality of seamless copper tubes about which is wound a helix of copper ribbon, crimped on its inner edge to permit winding and to afford maximum contact between tube and fin. The extended fin surface is applied, and tinned while held in position, by highly-developed automatic machines, being accurately crimped and spaced. The tinning of the tube and the extended surface makes them metallicly integral, affording maximum heat transmission and permanent effectiveness. The thickness and width (height) of the extended surface, the crimping and the pitch o( the helix were determined by careful experiment, to afford maximum heat transfer, uniform air flow and minimum resistance thereto. The copper tubes and fins of AeROFIN transmit heat eight times as effectively as iron. So scientifically is AEROFIN designed that air is heated more in passage through a single row of its tubes, a travel of 1 in., than in passage through an entire section of cast iron surface, a travel of 9 in. In AeROfTn the tubes are set into flexible tubeplates by means of a highly developed joint which is F'i l AEROFTN tight and permanent. See Fig. 1. 666 Aerofin Corporation Heat-Surface Fan System In AEROFTN and AeRoFFn the seam less tubes, with their extended fin surface, are continuous. See Figs. 2 and 3. Both AerofTn, Arv6'fTn and AeSoFM are furnished as completely encased units, ready for pipe and duct connec tions. The casings are built of pressed steel and are exceptionally strong and rigid, pro tecting the unit from all the strains of pipe connection and expansion or contraction in service. The casings are flanged on both faces, top and bottom, and template punched for bolting together adjacent units, or for duct connection. p**. Aerofin Standard Casings The casings of all AEROFIN Units, whether comprising one, two or three rows of tubes, are 29 in. wide, across tubes, from outer edge one flange to outer edge opposite flange, and 10 in. deep in direction of air flow. Length of casing is nominal tube length plus 8^ in. Sizes of AeroWn Aerofin is made in fifteen standard tube lengths, either one, two or three staggered rows of tubes per Unit. There are thus forty-five standard Units available, a range which adequately meets all requirements. Tubes are furnished of any length between 2 ft. 0 in. and 6 ft. 0 in., in increments of 6 in., and between 6 ft. 0 in. and 12 ft. 0 in. in increments of 1 ft. Complete Tables of Sizes and Capacities are shown in our Bulletin G8, mailed gratis upon request. Sizes of AiRffiN Aerofin is designed for installation with tubes horizontal only. It is available in one- or two-row Units, in seventeen standard nominal tube lengths (distance between end baffle plates, or between 180 bends,) between 2 ft. 0 in., and 10 ft. 0 in., inclusive, in increments of 6 in. Batteries of double width are easily assembled by setting Units end-to-end, leaving space for pipe connections. In AiRdtlN the seamless tubes are bent into a 3-pass coil, one end attached to the Supply Header, the other to the Drip Header, as indicated in Fig. 3. The connections to the welded Headers are made by means of special brass compression unions, insuring absolutely tight, dependable connections. (Tubes may be disconnected at unions and removed if, for any reason, this should become desirable.) Complete Tables of Sizes and Capacities at various Pressures are shown in Bul letin GU-8. Sizes of AEROm AiRfim is made in five standard tube lengths (i.e. length of straight section of tube, between the 180 deg. bends), 2 ft. 0 in., 2.ft. 6 in., 3 ft. 0 in., 3 ft. 6 in., 4 ft. 0 in., either one, two or three staggered rows of tubes per Unit. There are thus fifteen standard Units now available, meeting practically all requirements. Since the Supply and Drip Connections of Aer`oFW are located on the same end, Fig. 2, Units may be placed end-to-end thus affording battery widths of twice the Standard tube-lengths. Complete Tables of Sizes and Capacities are shown in our Bulletin GHP-2, mailed gratis upon request. 667