Investigations Of The Thermal Comfort In A Manned Space Craft Cabin

With the further development of manned space craft, especially the establishment of large-scalespace station and the increase of astronauts in-orbit flying time, the thermal comfort research inspacecraft cabin is become more and more urgent. This paper focuses on the artificial air environmentin a manned space craft habitation cabin, using numerical methods simulated the airflowcharacteristics and the thermal comfort in the cabin.(1) The airflow and heat transfer characteristics of the indexes of air distribution in manned spacecraft habitation cabin under micro-gravity environment has been investigated using RNGk turbulence model. Simulated three situation of cabin，respectively the cavity, cavity with aisothermal adiabatic partitions or a suspended solids, then investigated their flow and heattransfer situation in the cabin. Using air distribution indicators such ask T,k vand ADPI toevaluated comfort of cabin airflow, discussed the impact of inlet angle on environmentalcomfort in different models. Numerical results show that proper inlet angle is15o~45ounder themicro-gravity conditions, the influence of complex cabin structure and thermal environment ontemperature, speed uniformity and heat transfer effects is not as much as nomal gravity on theground.(2) The influence of different inlet-air temperature on cabin airflow in a simplified3-D habitationcabin model has been numerical investigated by Fluent, then using PMV and other indicatorsevaluated cabin thermal comfort environment. Moreover, heating loads generated by astronautswith working, sporting and sleeping states, lighting systems and instrument cases are consideredwhen dealing with the thermal boundary conditions. Analysis indicated that human and livingheating loads make a main contribution for the total heating loads, and the inlet-air temperatureshould be maintained at2~4℃, while air supply level is suitable, inlet velocity becoming themain factors affect the cabin thermal environment.(3) Improved three-dimensional model with high inlet velocity, discussed the impact of differentoutlet pattern and style on the habitation cabin thermal comfort. Result show that due to goodtemperature and speed uniformity, proper air velocity and better airflow characteristics, usinginterval outlet pattern is more conducive to create a comfortable thermal environment in cabin.