GASES AS SECONDARY HEAT TRANSFER FLUIDS
NORTH CAROLINA STATE UNIV AT RALEIGH
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Alkali liquid metals, because of their superior heat transfer characteristics, rate highly as secondary heat transfer fluids for systems consisting of a high temperature secondary heat exchanger, a transfer piping system, and one or more air radiators. However, because alkali liquid metals are highly corrosive when even very small amounts of impurities are present, consideration is given to the relative merits of gases. The relative effect of the use of hydrogen rather than an alkali liquid metal is presented for the secondary heat exchanger, the transfer piping, and the air radiator. In general, by a change in the configuration of the component parts, it is possible when using hydrogen to reduce weights to values comparable with those required for the liquid alkali metals. However, gas pressures must be in the order of several thousand pounds per square inch and pumping powers used which are several times those for the liquid alkali metals. Similarly, by using larger parts whose weights are several times those required for the alkali liquid metals, the pumping horsepowers may be reduced to values similar to those for the liquid alkali metals.