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<h2 class="hd hd-2 unit-title">Overview of ECLSS Requirements</h2>
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<h2>3.2.1 Overview of ECLSS Requirements</h2>
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Identify the basic requirements for humans to stay alive and healthy in space" type="button" id="LD">MO 3.1</button> <button border-radius="2px" class="mo_button" onclick="window.location.href='/courses/course-v1:MITx+16.00x+3T2016/5e0e82a56b234a2aaf12ac0b3359c3c5#MO32';" style="cursor: pointer;" title="MO 3.2:
Define open-loop and closed-loop ECLSS and explain the key distinctions between the two modes" type="button" id="LD">MO 3.2</button></p>
<p>It takes a number of environmental control and life support systems to keep humans alive and healthy in the vacuum of space. In the following video, Prof. Hoffman provides an overview of the various ECLSS requirements for human spaceflight. He also explains the distinction between two basic operational modes: open-loop and closed-loop ECLSS. </p>
<p>We've previously discussed <span style="line-height: 25.6000003814697px;">open-loop vs. closed-loop operations in the context of feedback control systems in <a href="/courses/course-v1:MITx+16.00x+2T2019/jump_to_id/4d9542367a02419c814e1a2bd5022ecb" target="[object Object]">Subsection 2.5.2</a>. In the context of ECLSS, open-loop systems are ones in which a</span>ll resources that will be consumed in space are brought from Earth. The waste products generated in open-loop ECLSS are disposed of instead of reused. In closed-loop ECLSS, on the other hand, waste products are recycled to provide resources that can be reused. Keep this distinction in mind as you go through the remainder of this unit; you will be asked to apply what you have learned to solve some ECLSS problems in Section 3.6.</p>
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<h2 class="hd hd-2 unit-title">Food and Personal Hygiene in Space</h2>
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<h2>3.2.2 Food and Personal Hygiene in Space</h2>
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Identify the basic requirements for humans to stay alive and healthy in space" type="button" id="LD">MO 3.1</button></p>
<p style="padding-left: 90px;"><img src="/assets/courseware/v1/fcc0edd6d26457664565c7fb7fea5e7f/asset-v1:MITx+16.00x+2T2019+type@asset+block/512px-ISSSpaceFoodOnATray.jpg" alt="Tray of food and utensils served onboard the International Space Station" type="saveimage" target="[object Object]" height="253" width="295" /> <img src="/assets/courseware/v1/d513a4d5668cf55c8a56ad7d1ac37693/asset-v1:MITx+16.00x+2T2019+type@asset+block/space_toilet.jpg" alt="Example of a Waste Collection System (WCS) used in space" type="saveimage" target="[object Object]" height="253" width="342" /></p>
<p></p>
<p style="padding-left: 30px;"><em style="line-height: 25.6000003814697px; text-align: center;"><span>Left: Tray of food and utensils served onboard the International Space Station. Note the use of magnets and Velcro strips for securing items to the tray (Image credit: NASA)<br />Right: Example of a Waste Collection System (space toilet) (Image credit: NASA)</span></em></p>
<p></p>
<p>Of all the questions that astronauts get asked about living in space, two of the most common ones are:</p>
<ul>
<li><span style="font-size: 1em; line-height: 1.6em;">What do you eat?</span></li>
<li><span style="font-size: 1em; line-height: 1.6em;">How do you go to the bathroom?</span></li>
</ul>
<p>These questions will be addressed in the following video, in which Prof. Hoffman discusses how astronauts deal with daily routines such as eating, doing laundry, and taking care of personal hygiene. He also explains the importance of keeping up with these routines in order to maintain physical and psychological health while in space.</p>
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