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Reconditioning of Batteries on the International Space Station (Paperback)
Loot Price: R290
Discovery Miles 2 900
You Save: R71
(20%)
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Reconditioning of Batteries on the International Space Station (Paperback)
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List price R361
Loot Price R290
Discovery Miles 2 900
You Save R71 (20%)
Expected to ship within 10 - 15 working days
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Primary source of electric power for the International Space
Station (ISS) is the photovoltaic module (PVM). At assembly
complete stage, the ISS will be served by 4 PVMs. Each PVM contains
two independent power channels such that one failure will result in
loss of only one power channel. During early stages of assembly,
the ISS is served by only one PVM designated as P6. Solar arrays
are used to convert solar flux into electrical power. Nickel
hydrogen batteries are used to store electrical power for use
during periods when the solar input is not adequate to support
channel loads. Batteries are operated per established procedures
that ensure that they are maintained within specified temperature
limits, charge current is controlled to conform to a specified
charge profile, and battery voltages are maintained within
specified limits. Both power channels on the PVM P6 have been
operating flawlessly since December 2000 with 100 percent power
availability. All components, including batteries, are monitored
regularly to ensure that they are operating within specified limits
and to trend their wear out and age effects. The paper briefly
describes the battery trend data. Batteries have started to show
some effects of aging and a battery reconditioning procedure is
being evaluated at this time. Reconditioning is expected to reduce
cell voltage divergence and provide data that can be used to update
the state of charge (SOC) computation in the software to account
for battery age. During reconditioning, each battery, one at a
time, will be discharged per a specified procedure and then
returned to a full state of charge. The paper describes the
reconditioning procedure and the expected benefits. The
reconditioning procedures have been thoroughly coordinated by all
affected technical teams and approved by all required boards. The
reconditioning is tentatively scheduled for September 2004.
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