Biomedical subjects

K H Zhou

Publications and source records attributed to K H Zhou.

6 recordsLinked to original sources

PubMed2001

[A study on steam generator in solid amine CO2 purification system].

Objective. To solve the key problems of power matching between process of CO2 steam desorption and process of steam generation, as well as water/vapor separation. Method. Solid amine desorption process was studied by thermodynamic analysis and experiments. The distribution rule of desorption energy was found out and then the power consumption of steam generator was decided. Ceramic insert was designed to separate water and vapor making use of surface tension. Finally, the steam generator was designed on system requirements. Result. Experiments proved that the steam generator can satisfy the demand of the system as well as successfully separate water and vapor, in addition, the selected power is suitable. Conclusion. The design on steam generator was right and practicable.

Air Conditioning↗

PubMed2000

[The study on CO2 concentration in solid amine CO2 control system].

OBJECTIVE: To solve the problem of CO2 concentration and collection in solid amine CO2 control system for long-duration spacecraft cabin. METHOD: One approach was presented on the base of the principle of absorption and desorption, and was then tested by the apparatus according to it. RESULT: The average concentration of the concentrated CO2 was as high as 95%, which can be directly sent to the CO2 reduction system, and about 90% of the concentrated CO2 can be collected. CONCLUSION: The designed apparatus met the requirements of the CO2 reduction system.

Absorption↗

PubMed2000

[Design of reaction canister in a solid amine carbon dioxide removal system].

Objective. To design a reaction canister using in solid amine carbon dioxide removal system for long-duration spaceflight. Method. On consideration of system demand and properties of solid amine, key problems must be solved were found out: 1) the rated resistance limit tends to shorten the length of the canister while absorption and concentration require to increase the length of the canister; 2) limited quantity of heat for keeping the temperature of the canister; 3) inflation or contraction of the solid amine under micro-gravity. Result. After appropriate measures were taken, effective adsorption and desorption, as well as concentration of CO2 were achieved, the concentration of CO2 in the space cabin could be controlled below 0.5%; and the concentration of the concentrated CO2 was as high as 98% so that it could be directly send to the CO2 reduction system; and that the resistance of the canister was below 160 mm H2O; moreover, the energy consumption was decreased to below 650 W. Conclusion. The designed reaction canister could meet the requirements of the solid amine carbon dioxide (correction of bioxide) removal system under microgravity.

Adsorption↗

PubMed2000

[A study of low temperature catalyst for Sabatier reaction].

Objective. To develop a low temperature catalyst for the Sabatier CO2 reduction of the atmospheric regeneration system and lower the start-up temperature of the Sabatier reaction. Method. A low temperature catalyst was designed from the considerations of the active composition, the choice of the carrier, the production method and condition of the catalyst. Then the performance of the newly developed low temperature catalyst was tested. Result. A new low temperature catalyst for the Sabatier reaction using Ru as the active composition and using r-Al2O3 as the carrier was developed. The start-up temperature was lower than 110 degrees C and the start-up time was 8 min; The conversion efficiency of the lean component (H2 or CO2) was over 95 percent when the temperature of the reactor was from 200 degrees C to 300 degrees C; The reaction product water was nearly colorless, transparent and neutral. Conclusion. The test results showed that the goals of the design are achieved and it is worthwhile to make further studies on the low temperature catalyst.

Air Conditioning↗

PubMed2000

[The development of a static water/gas separator].

Objective. To develop a device for separating water from gas in small flow rate under zero "G". Method. Beginning with the study of surface characteristic of materials, a capillary material was developed according to the requirement and the water/gas separator using this single separating material was designed. Result. The water/gas separator worked well in the range of gas flow below 10.0 L/min and water flow below 10.0 ml/min. No gas was found in the separated water and no water was found in the separated gas. Conclusion. The structure of the separator was reasonable and the water/gas separating method using a single separating material was feasible.

Air Conditioning↗

PubMed1999

[An experimental study of the Sabatier CO2 reduction subsytem for space station].

Objective. To develop and fabricate a prototype Sabatier CO2 reduction subsystem for long duration manned space missions. Method. The rationale, equipment and function of the Sabatier CO2 reduction subsystem were introduced. Groundbased experiments with CO2 flows equivalent to a crewsize of 3 persons were conducted to verify the operation performance of the prototype. Result. The start-up temperature is less than 165 degrees C when the start-up time is 14 min; the lean component H2/CO2 conversion efficiency is over 95 percent when H2/CO2 molar ratios is 1.9-5.0; The water produced is nearly colorless and neutral. Conclusion. The prototype Sabatier CO2 reduction subsystem is simple in operation and the test results showed that design goals were achieved.

Air Conditioning↗