Dispersione di calore in tute spaziali
Inviato da Dusty il 9/2/2006 17:19:11
Si è parlato in un altro thread (quello dell'analisi delle foto) di come le tute disperdano calore.
Ho trovato questa spiegazione (di cui non so assolutamente valutare la veridicità) qui e la riporto per semplicità nel caso servisse come base di discussione per il futuro:
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6) The spacesuits cannot operate their air-conditioning in a vacuum.
This one comes up on a fairly regular basis so I decided to include it. It seems to be a popular misconception that heat cannot be removed from an object in a vacuum. A little thought on the subject easily dispels this myth, for if that were the case how could we receive heat from the Sun? Radiation travels though a vacuum, this is an obvious fact. The system used by the spacesuits to shed surplus heat generated by the exertions of the astronauts is fairly simple in operation. The astronauts wear a garment that has water filled tubes running through it that is circulated around their body. The cool water absorbs the heat from the astronauts and is cooled down by the cooling unit. The cooling is achieved by spraying a fine jet of water over the cooling tubes which are located outside the space suit in the cooling unit and exposed to the vacuum of space. In a vacuum the water spray naturally rapidly expands, and in expanding is naturally rapidly cooled, and turns to ice on the tubes. The water passing through is cooled by the cold tubes and the heat given up by the water melts the ice and is lost into space as it evaporates. Simple. The astronauts are able to adjust the temperature control of their spacesuits according to their exertions.
The amount of water used is minute compared to the volume of drinking water taken on board to supply a crew of three for periods of a week and over. For more information on how spacesuits work visit the following site: www.howstuffworks
Ho trovato questa spiegazione (di cui non so assolutamente valutare la veridicità) qui e la riporto per semplicità nel caso servisse come base di discussione per il futuro:
----
6) The spacesuits cannot operate their air-conditioning in a vacuum.
This one comes up on a fairly regular basis so I decided to include it. It seems to be a popular misconception that heat cannot be removed from an object in a vacuum. A little thought on the subject easily dispels this myth, for if that were the case how could we receive heat from the Sun? Radiation travels though a vacuum, this is an obvious fact. The system used by the spacesuits to shed surplus heat generated by the exertions of the astronauts is fairly simple in operation. The astronauts wear a garment that has water filled tubes running through it that is circulated around their body. The cool water absorbs the heat from the astronauts and is cooled down by the cooling unit. The cooling is achieved by spraying a fine jet of water over the cooling tubes which are located outside the space suit in the cooling unit and exposed to the vacuum of space. In a vacuum the water spray naturally rapidly expands, and in expanding is naturally rapidly cooled, and turns to ice on the tubes. The water passing through is cooled by the cold tubes and the heat given up by the water melts the ice and is lost into space as it evaporates. Simple. The astronauts are able to adjust the temperature control of their spacesuits according to their exertions.
The amount of water used is minute compared to the volume of drinking water taken on board to supply a crew of three for periods of a week and over. For more information on how spacesuits work visit the following site: www.howstuffworks
Messaggio orinale: https://old.luogocomune.net/site/newbb/viewtopic.php?forum=13&topic_id=62&post_id=10468