Abstract
A subscale, direct contact heat exchanger (1-ft dia packed column) was built and operated under conditions applicable to the Biphase diesel bottoming cycle. Special probes for measuring gas and liquid temperatures and for measuring gas-phase compositions were designed and installed in the exchanger. The data obtained are unique in that they indicate both the extent of evaporation and condensation zones within the exchanger and the effect that those mass transport mechanisms have upon heat exchanger performance. For gas temperatures greater than 500/sup 0/F it was found that the maximum temperature to which Therminol 66 could be heated was strongly dependent upon vaporization effects. Data obtained are sufficient to provide for the preliminary design of a direct contact heat exchanger using Therminol 66 as the thermal fluid. Recommendations are made for further testing using other heat transfer fluids to derive a more general engineering approach to the design of direct heat exchangers.
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