The Siemens cycle is a technique used to cool or liquefy gases.[1] A gas is compressed, leading to an increase in its temperature due to the directly proportional relationship between temperature and pressure (as stated by Gay-Lussac's law). The compressed gas is then cooled by a heat exchanger and decompressed, resulting in a (possibly condensed) gas that is colder than the original at the same pressure.
1. Heated – by compressing the gas – adding external energy into the gas, to give it what is needed for running through the cycle
2. Cooled – by immersing the gas in a cooler environment, losing some of its heat (and energy)
3. Cooled through heat exchanger with returning gas from next (and last stage)
4. Cooled further by expanding the gas and doing work, removing heat (and energy)
The gas which is now at its coolest in the current cycle, is recycled and sent back to be –
5. Heated – when participating as the coolant for stage 3, and then
6. Resent to stage one, to start the next cycle, and be slightly reheated by compression.
In each cycle the net cooling is more than the heat added at the beginning of the cycle. As the gas passes more cycles and becomes cooler, reaching lower temperatures at the expanding cylinder (stage 4 of the Siemens cycle) becomes more difficult.
^. Archived from the original on 2008-09-14. Retrieved 2008-09-04.
^Charles William Siemens, "Improvements in refrigerating and producing ice, and in apparatus or machinery for that purpose", British patent no. 2064 (filed: July 29, 1857).
^. Archived from the original on 2016-10-30. Retrieved 2008-09-04.
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siemens, cycle, technique, used, cool, liquefy, gases, compressed, leading, increase, temperature, directly, proportional, relationship, between, temperature, pressure, stated, lussac, compressed, then, cooled, heat, exchanger, decompressed, resulting, possibl. The Siemens cycle is a technique used to cool or liquefy gases 1 A gas is compressed leading to an increase in its temperature due to the directly proportional relationship between temperature and pressure as stated by Gay Lussac s law The compressed gas is then cooled by a heat exchanger and decompressed resulting in a possibly condensed gas that is colder than the original at the same pressure Carl Wilhelm Siemens patented the Siemens cycle in 1857 2 3 In the Siemens cycle the gas is 1 Heated by compressing the gas adding external energy into the gas to give it what is needed for running through the cycle 2 Cooled by immersing the gas in a cooler environment losing some of its heat and energy 3 Cooled through heat exchanger with returning gas from next and last stage 4 Cooled further by expanding the gas and doing work removing heat and energy The gas which is now at its coolest in the current cycle is recycled and sent back to be 5 Heated when participating as the coolant for stage 3 and then 6 Resent to stage one to start the next cycle and be slightly reheated by compression In each cycle the net cooling is more than the heat added at the beginning of the cycle As the gas passes more cycles and becomes cooler reaching lower temperatures at the expanding cylinder stage 4 of the Siemens cycle becomes more difficult See also editAdiabatic process Gas compressor Hampson Linde cycle Regenerative cooling Timeline of low temperature technologyReferences edit Adiabatic Expansion Cooling of Gases Archived from the original on 2008 09 14 Retrieved 2008 09 04 Charles William Siemens Improvements in refrigerating and producing ice and in apparatus or machinery for that purpose British patent no 2064 filed July 29 1857 The Siemens cycle Archived from the original on 2016 10 30 Retrieved 2008 09 04 nbsp This thermodynamics related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Siemens cycle amp oldid 1099294457, wikipedia, wiki, book, books, library,
