What mechanism did NASA and SunDanzer utilize to eliminate the need for batteries?
Answer
Phase change material used for storing thermal energy
By shifting the focus from storing chemical energy in batteries to storing thermal energy, NASA and later SunDanzer engineers were able to create more reliable and durable cooling systems. Phase change material acts as a thermal buffer, absorbing cooling energy when the sun is shining and releasing it during non-sunlight hours. This innovation was critical for vaccine storage, as it ensured that temperatures remained within the strict 35-46 degrees Fahrenheit range without relying on potentially unreliable or short-lived battery systems.
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