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Safety Considerations in the Design of Spacelab Refrigerator/Freezer
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Abstract
A vapor compression refrigerator/freezer has been designed for spacelab to conduct life sciences experiments. It is equipped with different safety features to eliminate all probable types of failures. The whole freon loop is enclosed in a second containment so that any leakage of freon can be contained. The unit is provided with an ‘Emergency On’ switch to actuate during backup mode which provides the spacecraft power directly to the compressor and the cooling fans while removing the power supply and all normal control elements from the circuit. During this mode, the compressor runs continuously when operating as a freezer (-22°C) and is controlled by a thermostat to cycle when operating as a refrigerator (4°C). It has a push button switch at the front panel to momentarily power the thermometer by a battery to monitor the inside temperature during an emergency. It has a door switch which shuts off the internal cooling fans when the door is opened. All the important critical performance data will be downlinked through a data connector to monitor during mission.
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Citation
Hye, A., "Safety Considerations in the Design of Spacelab Refrigerator/Freezer," SAE Technical Paper 851373, 1985, https://doi.org/10.4271/851373.Also In
References
- Safety Policy and Requirements NASA
- Hye, A. Design and Development of a Vapor Compression Refrigerator/Freezer for Spacelab presented at the 13th Intersociety Conference SAE San Francisco, California July 1983
- Hye, A. The Design and Development of an Oil-free Compressor for Spacelab Refrigerator/Freezer presented at the 14th Intersociety Conference SAE San Diego, California July 1984
- Hye, A. Design of Evaporator of Spacelab Refrigerator/Freezer presented at the AIAA 26th Structures, Structural Dyamics and Materials Conference Orlando, Florida April 1985