THE EFFECT OF PARA-ORTHO SHIFT ON HEAT EXCHANGER DESIGN IN HYDROGEN NITROGEN HEAT EXCHANGE AT HIGH PRESSURES
AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH
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The size of a H2-N2 heat exchanger condenser is exponentially a function of flow ratio of N2H2. This is in agreement with the literature. The function is such that at 800 psia H and 20 atm 194 psia or 33.5 atm N2 being cooled from 300 or 500 R, a straight line assumption is reasonable below the flow ratio of 5N2H2 the constants 2,4,5,6,7, and 8 represent 2 through 8 of N2 condensed per H2. Above this value the assumption is poor. The effect of hydrogen para-ortho shift on heat exchanger design is small at low ratios of N2 H2 up to 3N2H2. Above this value it becomes a minor factor and should be considered. Above 5N2H2 the para-ortho shift affects the size of an exchange 25 or more and is a major factor.
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