Dehumidification device and method for three-fluid film

Abstract

The invention proposes a coaxial three-fluid membrane dehumidification device, which is mainly composed of a membrane tube, a metal sleeve and a shell. The three fluids are cold water, humid air, and hot water from the inside to the outside. Cold water flows in the innermost membrane tube, moist air flows in the annular channel between the membrane tube and the casing, and hot water flows between the casing and the casing. Flow in the annular channel between. The cold water provides a lower water pressure, forming a water vapor partial pressure difference with the humid air with a high water pressure, and the water vapor will enter the cold water through the membrane holes under the action of the water vapor partial pressure difference on both sides of the membrane, so as to achieve the purpose of dehumidification . The function of the hot water on the outermost side of the three-fluid film dehumidification device is to maintain the temperature of the humid air in the casing so that it is always higher than the dew point temperature so as to avoid condensation. Compared with traditional condensation dehumidification methods, three-fluid membrane dehumidification has significant advantages in some special fields (such as the cabin humidity control of manned spacecraft).

Description

technical field [0001] The invention relates to a three-fluid membrane dehumidification device and method suitable for air dehumidification in the spaceflight microgravity environment. Background technique [0002] At present, on manned spacecraft, the dehumidification of the air in the cabin mainly adopts condensation dehumidification technology, which reduces the temperature of the humid air to below the dew point temperature, thereby condensing liquid water to achieve the purpose of dehumidification. However, there are some problems with this dehumidification technology. Since condensation dehumidification is a strongly coupled process of temperature and humidity, the dehumidification of humid air will greatly reduce the temperature at the same time. It is difficult to control temperature and humidity independently, and sometimes problems cannot be considered. Moreover, under the weightless conditions of the spacecraft, the condensed liquid water cannot be naturally separ...

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Problems solved by technology

However, there are some problems with this dehumidification technology. Since condensation dehumidification is a strongly coupled process of temperature and humidity, the dehumidification of humid air will greatly reduce the temperature at the same time. It is difficult to control the temperature and humidity independently, and sometimes there will be problems that cannot be balanced

Moreover, under the condition of the weightlessness of the spacecraft, the condensed liquid water cannot be separated from the air naturally by gravity. At this time, a special gas-liquid separator must be installed to separate and store the liquid water.

This kind of gas-liquid separator will increase the weight of the system, and its complicated internal structure will bring inconvenience to future maintenance

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