Tang and other dehydrated food into space

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Discussion Overview

The discussion revolves around the rationale behind sending dehydrated food, such as Tang, into space. Participants explore the implications of weight savings, food storage, and water recycling in the context of space missions.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant questions the weight savings of sending dehydrated food when water is still needed for rehydration, drawing an analogy to an overcoat with buttons removed.
  • Another participant suggests that dehydrated food makes storage easier and helps maintain freshness over time, indicating that food is packed well in advance of launch.
  • A participant expresses a positive view of Tang, stating it is "great stuff."
  • One participant explains that Tang is rehydrated with recycled water, arguing that the water needed for a crew's metabolism can also rehydrate the Tang, thus saving weight overall.
  • Another participant reiterates the water recycling process, emphasizing that all bodily excretions are filtered and reused, contributing to the water supply for rehydration.
  • A participant challenges the idea that astronauts do not eat or drink until they have evacuated, asserting that the primary reason for using dehydrated food is weight savings rather than recycling concerns.
  • Another participant provides links to NASA resources, stating that removing water from food systems is a method for conserving weight during launch and that astronauts have access to more than just dehydrated foods.
  • This participant also notes that only a few items in a meal may be freeze-dried, suggesting that the food situation has been thoroughly analyzed.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness and rationale behind using dehydrated food in space. There is no consensus on whether weight savings are significant or if the process of rehydration is justified.

Contextual Notes

Some claims depend on assumptions about water recycling efficiency and the analysis of food systems in space, which remain unresolved in the discussion.

wyzowl
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Why do our space "scientists" send Tang and other dehydrated food into space; to save weight? We take along the water needed to rehydrate the food. Where is the weight savings? In grade school we used to joke about the guy that sent an overcoat to his friend but cut off the buttons to save weight (theyr'e in the pocket, he reminded).
 
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Probably to make food storage easier, and to keep the food fresh for a long time. I'm betting that the food is packed into the Space Shuttle long before it's launched.
 
besides, tang is great stuff =)
 
Where does a space crew's water come from

wyzowl said:
Why do our space "scientists" send Tang and other dehydrated food into space; to save weight? We take along the water needed to rehydrate the food. Where is the weight savings?
The Tang is rehydrated with recycled water. Enough water for a single crew metabolism/hygiene cycle in the space shuttle/space station is also enough to rehydrate an infinite amount of Tang for that crew. Hence, the Tang does not need its own water and is sent up as powder and further hence saving exactly as much weight as the extra weight of the liquid Tang displaced by the powder.

Water recycling for a space crew means that all water excreted from the body as urine and as moisture in their feces is collected and filtered so it can be re-used by the crew. Other sources of water for recycling are water that is respired and sweated into the atmosphere the crew lives in and water used for clean-up (hygiene).
 
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hitssquad said:
Water recycling for a space crew means that all water excreted from the body as urine and as moisture in their feces is collected and filtered so it can be re-used by the crew.

Yum
 
You mean they don't eat or drink unitl they have evacuated? I don't think so. The fact is that they announced early in the program, maybe you weren't there but I was, that they did it to save weight. Recycled water comes from water ingested. Why not eat good food and drink good juice first? Why bother with all the work of reconstituting juice and food. As I recall they spent millions developing a method of inserting the water without spilling. The answer is NOT recycling. The answer is not analyzing the situation properly.
 
This page has some information on the foods that shuttle astronauts eat and drink in space:

http://spaceflight.nasa.gov/shuttle/reference/factsheets/food.html

"One way weight can be conserved during launch is to remove water in the food system. During the flight, water is added back to the food just before it is eaten. The Shuttle orbiter fuel cells, which produce electricity by combining hydrogen and oxygen, provide ample water for rehydrating foods as well as drinking and a host of other uses."

The astronauts also have more than just dehydrated foods available to them. Here is an astronaut's menu from a previous shuttle flight:

http://spaceflight.nasa.gov/shuttle/archives/sts-113/crew/menus/menuwetherbee1.html

It looks to me like for any given meal, only a few items are truly "freeze dried." This page outlines some different food types:

http://liftoff.msfc.nasa.gov/academy/astronauts/food-menu.html

I think the situation has probably been pretty well analyzed.
 
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