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Manned spacecraft environment control and life support system of lightweight thermal network analysis


Cooling plate; layout of the order of 3 as the refrigerant flows through the cooling plate, heat exchanger 2 and heat exchanger 1. No. 5 Zhang Xinrong other manned spacecraft environment control and life support system of lightweight thermal network analysis 355i; ii; / ■ day The curve of a valve of a loop in a loop} 101 5 valve; △ a loop of a 10 valve Fig.5Systemwelghtvsvalvenumberintheloop a one onevalveintheloop; 101 fivevalv device inthe1cop: A △ a tertvalvesintheloop1. 00 099 098 097 096 ::::: from Portland i: j ... .... ...: II: 7 ... ... ... a 0.40.50.60.70.80.9L_0d Figure 6 the amount of system and circuit for a valve between the number of curve of a of a loop in a valve; 101 5 circuit valves; A △ a circuit l0 valves Flg.6Systemweightvsvalvenumbegintheloop a one onevalveintheloop; an O-fivevalvesintheloop: A △ a tenval regret inthe1ooi> can see that the weight for the system, the layout of the 3 Sheng Tai, layout 2 Second, the layout of a minimum. previous results show that the _5], entropy condition corresponds to a small performance of the high heat conditions, they are corresponds to a uniform temperature field conditions. In other words, as long as the heat exchanger to reduce the inhomogeneity of temperature difference field, you can also improve its effectiveness and reduce its irreversibility, namely to improve the efficiency of its second law of thermodynamics. From point of view of heat transfer, thermal network can be viewed as a large heat exchange system, when the hot and cold fluid in the system more uniform temperature field, the second law of thermodynamics the total system more efficient, so that the system reduce the overall weight. For purposes of uniformity of temperature difference field, cloth, d Figure 7, the layout of the system for a thermal component of the relationship between the amount of a distribution curve of an Ii 101 Layout 2; △ a layout for a 3 foot .7 Im'l ~ ofcomponentlayoutoHsystemweight a one hyo ~ tone-O-layouttwo; a best △ a layoutthree Board 1, layout 2 Second, the layout of the 3 worst. Therefore, the layout of a condition of high performance heat exchanger networks, entropy production is small, the system weight small. Conclusion Although this article only focuses on a simplified system of environment control and life optimize heat transfer and asked the weight of universal condemnation, the actual layout to be more complex, but enough of this study show that the manned spacecraft environment control and life support system in the flow The weight of the thermal network is largely affected by many factors, such as pipe diameter, flow rate and to air temperature. but also the layout of the thermal component has a lot whether it is reasonable. These factors are interrelated and inseparable. minimum weight thermal network corresponds to these factors will be the best value. Department of environment control and life during the optimization of the design environment, must be integrated into the various factors on the weight of the law. [
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