University of Twente Student Theses


New sorption compressor designs for the METIS cooler in the E-ELT

Mulder, T. (2014) New sorption compressor designs for the METIS cooler in the E-ELT.

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Abstract:Sorption-based cooling provides vibration free and electro-magnetic interference free cooling that fits the needs of space applications and ultra sensitive sensors. In sorption compressors for space applications efficiency is of most importance, therefore Gas-Gap Heat Switches (GGHS) are used to limit the energy loss during operation. For the METIS instrument in the European Extremely Large Telescope, a ground based application, efficiency is of lower concern. For this reason new sorption compressor designs are made for the cooling system of this instrument. In these new designs the primary change is the replacement of the GGHS by a layer of insulation. To evaluate the performance of the new compressor design a dynamic thermal model is developed. This model simulates the behavior of a sorption compressor cell and provides values for the cycle time, required input power and the amount of mass it can deliver. The results of the model are validated by experiments. The new compressor cell design is optimized for the compressor system in the METIS cooler by using the model. The optimized compressor system includes 70 new compressor cells with a total required input power of 1093 W. This is an 31% increase in input power compared a compressor system that uses compressor cells with the old design that include gas-gap heat switches. However, the new design will increase the manufacturability and lower the production costs of the sorption compressor cells.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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