Heat exchangers Collins

Collins, G. E. and R. T. Matthews, Climatic Considerations in the Design of Air-Cooled Heat Exchangers, Heat Transfer Div. Paper No. 59-A-255, ASME, presented at annual meeting Atlantic City, N.J. (1959). 

COKE OVEN GAS. Contains hydrogen, methane, carbon dioxide and volatile organic compounds. Aluminum alloy deacidifiers, heat exchangers, and heating coils have been used in the Collins process for the desulfurization of coke oven gas. Condensation of moistuie on surfaces contacting coke oven gas can accelerate corrosion on aluminum alloys as the result of the formation of sulfutous acid. See also Ref (Dp. 130, (2) p. 859. 

Answer by Author The heat exchanger used was a Collins type, consisting of a finned tube spiraled on a mandrel. The exchanger was approximately 0.2 in. in diameter and 2.0 in. long. 

Comparisons between the datawhichwere obtained in this work and previously published data for compact exchangers are presented in Fig. 10. The over-all J factor for heat transfer for the helically finned and coiled heat exchanger is only slightly less than the individual j factor reported for the Collins-t3rpe ribbon-packed heat exchanger [6]. The approximate j factor reported in this work is substantially higher than the j factor reported above. 

It is to be noted that the ratio of the friction factor / to the heat transfer factor J for compact ribbon-packed heat exchangers is approximately equal to the ratio of / to j reported in the present work. F rom this it may be concluded that more compact heat exchangers can be designed with helically finned and coiled tubing, which also represents a Collins type of heat exchanger, without any sacrifice in shell-side pressure drop. 

Collins-type concentric extended surface heat exchanger manufactured by the Joy Manufacturing Company, Michigan City, Ind. 

The work of Kapitza [7] and the exceptionally notable developments of Collins [8] had in common the utilization of expansion engines in combination with counterflow heat exchangers, and both were successful in liquefying helium. The Collins system was the first to use multiple engines operating at intermediate temperatures and thereby eliminate the need for any auxiliary refrigeration. This feature, combined with certain constructional advantages [9], has led to a wide acceptance of the Collins system for helium liquefaction. 

The early concepts of Kirk and Stirling in which a reciprocating-flow thermal regenerator is used in place of a countercurrent heat exchanger have recently been refined and developed effectively into an air liquefier by the Philips Company [10]. The system is characterized by the use of two articulated pistons which provide a compression space and an expansion space, interconnected through a thermal regenerator. Unlike the Kapitza or Collins system, there are... 

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