Simulation program for a two-phase thermosiphon-loop heat exchanger

A computer program capable of simulating two-phase multiple tube-row thermosiphon loop heat exchanger systems is described. The evaporator and condenser coils must be of a single-pass, straight-tube configuration. The loop may have any specified thermal boundary conditions and any geometric orientation subject to the limitation that the condensate must be capable of returning to the evaporator liquid header by gravity. A comparison between simulated and experimental performance results is also presented for two different systems. One system involved water-jacketed evaporator and condenser tubes. The second system utilized air-to-air finned-tube evaporator and condenser coils. The simulated performance for each of the systems was found to be in good agreement with the experimentally measured values. In both of these studies the working fluid was R-11.