page_title: TransHab
section_title: TransHab layout
hierarchical_section_title: TransHab / Technology / TransHab layout
caption_attribution_description: English: Computer Generated Still --- Closeup of Transhab Module Level 3. Transhab to be installed on the International Space Station.
context_page_description: TransHab was a concept pursued by NASA in the 1990s to develop the technology for expandable habitats inflated by air in space. Specifically, TransHab was intended as a replacement for the already existing rigid International Space Station crew Habitation Module. When deflated, inflatable modules provide an 'easier to launch' compact form. When fully inflated, TransHab would expand to 8.2 meters in diameter.
context_section_description: TransHab was intended to be composed of four levels/floors.
  Level 4
  The Pressurized Tunnel Area was intended to provide a passageway between TransHab and any vehicle to which it is attached. The original tunnel design had two standard International Space Station hatches and housed critical equipment required during module expansion, such as avionics and power equipment.
  Level 3
  Level Three was to house an exercise area with a treadmill and stationary bicycle. The design also contained a complete health care system with all types of medical and emergency equipment and a type of "space bath" area provided for body cleansing. In addition, this level contained a soft stowage area identical to level one.
  Crew Health Care Area -- The design for the crew health care area incorporated two ISS Crew Health Care System racks, a Full Body Cleansing Compartment, changing area, exercise equipment (treadmill and ergometer), a partitionable area for private medical exams and conferencing, as well as an Earth-viewing window. The Earth-viewing window was to have been 51 centimeters (20 inches) in diameter and was located near the exercise area. The window design had four panes totaling 10.2 centimeters (4 inches) thick and a hard frame around each window that attaches to all layers of the shell.
  Stowage -- Soft-sided cabinets was to have provided stowage for spare parts, supplies, clothing and other equipment. If built, TransHab would have doubled the stowage room available on the International Space Station.
  Level 2
  Crew Quarters -- The crew quarters area design had six individual crew quarters, sized at 2.3 cubic meters (81 cubic feet) of volume per crew quarter, and a central passageway located within the second level central core structure and water tanks. Each compartment contains a sleeping bag/sleep restraint, an area for stowing personal items, and a computer entertainment center for recreation and personal work.
  Mechanical -- The mechanical room is external to the core structure and uses only half the floor space. It is acoustically and visually isolated. The other half of this area is a clerestory above the wardroom area. The mechanical room consists of an environmental control and life support system, power equipment and avionics equipment and provides return airflow from Level One and Level Three through openings.
  Level 1
  The first level was to house a kitchen with a refrigerator-freezer, microwave oven, water dispenser, and food preparation equipment as well as a table that seats 12, enough to allow an entire Station resident crew and replacement crew to sit together for meetings or meals. There were to be three galley racks, a large wardroom table, a soft stowage array and an Earth-viewing window identical to the window on Level 3.
caption: Level 4 and 3
exif: {}