In the past, virtually all commercial computers were designed to operate at temperatures above the ambient and were primarily air-cooled. However, researchers have always known the advantages of operating electronics at low temperatures. This facilitates faster switching time of semiconductor devices, increased circuit speeds due to lower electrical resistance of interconnecting materials, and reduction in thermally induced failures of devices and components. Depending on the doping characteristics of the chip, performance improvement ranges from 1% to 3% for every 10°C lower transistor temperature can be realized. The IBM S/390 high-end server system is the first IBM design which uses a conventional refrigeration system to maintain the chip temperatures below that of comparable air-cooled systems, but well above cryogenic temperature. In previous work, the focus was to study the effect of variation of evaporator outlet superheat on the flow through thermostatic expansion valve at varying evaporator temperature. The effect of change in bulb location and effect of bulb time constant on the hunting at the evaporator has been reported. The effect of area contact on the stability of the system is been predicted theoretically. Mechanical analysis is performed in order to check the stresses induced. The evaporator return line and the sensor bulb are simply attached. The effect of area contact is further studied experimentally on an experimental bench.
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Impact of Area Contact Between Sensor Bulb and Evaporator Return Line on Modular Refrigeration Unit: Computational and Experimental
Saket Karajgikar,
Saket Karajgikar
Mechanical and Aerospace Department, The University of Texas at Arlington, Arlington, TX 76010
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Nikhil Lakhkar,
Nikhil Lakhkar
Mechanical and Aerospace Department, The University of Texas at Arlington, Arlington, TX 76010
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Dereje Agonafer, Fellow ASME,
e-mail: agonafer@uta.edu
Dereje Agonafer, Fellow ASME
Mechanical and Aerospace Department, The University of Texas at Arlington, Arlington, TX 76010
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Roger Schmidt, Fellow ASME
Roger Schmidt, Fellow ASME
IBM Corporation, Poughkeepsie, NY
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Saket Karajgikar
Mechanical and Aerospace Department, The University of Texas at Arlington, Arlington, TX 76010
Nikhil Lakhkar
Mechanical and Aerospace Department, The University of Texas at Arlington, Arlington, TX 76010
Dereje Agonafer, Fellow ASME
Mechanical and Aerospace Department, The University of Texas at Arlington, Arlington, TX 76010
e-mail: agonafer@uta.edu
Roger Schmidt, Fellow ASME
IBM Corporation, Poughkeepsie, NY
Manuscript received May 6, 2004; revision received September 19, 2004. Review conducted by: C. Amon.
J. Heat Transfer. Jan 2005, 127(1): 95-100 (6 pages)
Published Online: February 15, 2005
Article history
Received:
May 6, 2004
Revised:
September 19, 2004
Online:
February 15, 2005
Citation
Karajgikar , S., Lakhkar , N., Agonafer, D., and Schmidt, R. (February 15, 2005). "Impact of Area Contact Between Sensor Bulb and Evaporator Return Line on Modular Refrigeration Unit: Computational and Experimental ." ASME. J. Heat Transfer. January 2005; 127(1): 95–100. https://doi.org/10.1115/1.1839585
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