The influence of noncondensing gases on the heat-and-mass transfer process in the rotary distiller of a system for water reclamation from urine.

Space technics and technology


Аuthors

Bobe L. S.1, Rakov V. V.2, Kanaev P. A.1, Arakcheev D. V.1

1. Research Institute, NIIchimmach, 14, Novodmitrovskaya, Moscow, 127015, Russia
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

Abstract

Research into the influence of the content of noncondensing gases in the rotary multistage vacuum distiller on the operational efficiency of the distillation subsystem of a system for water reclamation from urine. The subsystem is designed for a space station and based on the vacuum distillation method with heat recovery in the rotary multistage distiller and in a thermoelectric heat pump. The data for analysis are obtained in experiments conducted at residual pressure in the distiller from 400 to 800 mm H2O, coolant temperature from 19 to 24°C, gas content in the distiller condensate collection chamber from 0.2 to 0.7 and distiller rotor rotational speed of 1200 rpm. In analysis the relationships of diffusion/convective heat-and-mass exchange in the vapor/gas boundary layer based on the expanded analogy between these processes. It is shown that with an increase in the content of noncondensing gas in the distiller condensate collection chamber the efficiency of energy input to the distillation cycle and condensate output are redused. The analysis results are in agreement with the experimental data and confirm the validity of engineering decisions aimed at minimization of the content of noncondensing gases.

Keywords:

distillation, a system for water reclamation from urine, heat-and-mass transfer, noncondensing gases.


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