Results 251 to 260 of about 71,119 (272)

Solid-State Quantum Refrigeration

2013
Abstract : In this project, we investigated a new method, adiabatic quantum cooling, to address issues involved in semiconductor laser cooling. We have developed the theoretical framework, as well as numerical modeling methods to design and model semiconductor devices.
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Plastic crystals could be solid-state refrigerants

C&EN Global Enterprise, 2019
Regulators and manufacturers started phasing out chlorofluorocarbon gas refrigerants like Freon in the late 1970s after scientists discovered that they could deplete the ozone layer. But their replacements, hydrochlorofluorocarbons and hydrofluorocarbons, are greenhouse gases.
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Solid state refrigeration: Cooling and refrigeration using crystalline phase changes in metal alloys

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2004
The well-known fact that a phase change is normally accompanied by a relatively large change in internal energy is explored and is used to develop an innovative method of achieving refrigerative effects in solid state metal alloys. Applying a cyclic mechanical stress in certain materials can induce crystalline structural changes, with accompanying ...
Quarini, GL, Prince, AG
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Device Model for a Solid-State Barocaloric Refrigerator

Energy Technology
Solid‐state refrigeration represents a promising alternative to vapor compression cooling systems. Solid‐state devices based on magnetocaloric, electrocaloric, and elastocaloric effects have demonstrated the ability to achieve high‐efficiency, reliable, and environment‐friendly refrigeration. Cooling devices based on the barocaloric (BC) effect—entropy
Naveen Weerasekera, Huan Jiang, Yanyu Chen, Gamini Sumanasekera, Bikram Bhatia   +4 more
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The Los Alamos Solid-State Optical Refrigerator

1997
Optical refrigeration may provide the physical basis for solid-state cryocooling. Devices based on this physics would be vibrationless, compact, and free of electromagnetic interference. Having no moving parts and being pumped by a diode lasers, optical refrigerators would be rugged with operating lifetimes of years.
R. I. Epstein, B. C. Edwards, C. E. Mungan, M. I. Buchwald   +3 more
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Laser-induced lensing effects in solid-state optical refrigerators

Applied Physics Letters, 2013
Laser-induced thermal and population lensing effects in solid-state optical refrigerator materials are quantitatively evaluated. Time-resolved lensing transients in Yb3+ doped ZBLAN and aluminosilicate glasses are measured, and the model decouples thermal and population lensing effects. The analysis yields the net power density, the cooling efficiency,
Silva, J., Andrade, L., Lima, S., Hehlen, M., Guyot, Y., Medina, A., Malacarne, L., Baesso, M., Astrath, N.   +8 more
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Effect of contact resistance in solid-state thermionic refrigeration

Journal of Applied Physics, 2002
An analytical model of thermionic emission cooling that includes contact resistance is presented. The electrical current density necessary for peak operation of thermionic emission coolers is such that even the slightest resistance in the contacts to the devices will significantly reduce the cooling and coefficient of the performance.
Marc D. Ulrich, Peter A. Barnes, Cronin B. Vining   +2 more
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Electrocaloric materials for future solid-state refrigeration technologies

Progress in Materials Science, 2012
The electrocaloric (EC) effect is an adiabatic and reversible temperature change that occurs in a polar material upon application of an electric field. The current intensive research in EC materials has been driven by the quest for new energy efficient and environmentally friendly cooling technologies.
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Development of the Los Alamos solid-state optical refrigerator

Review of Scientific Instruments, 1998
Laser-induced cooling of a solid by net anti-Stokes fluorescence, first experimentally demonstrated in 1995, can be the basis of a new type of cryocooler, an optical refrigerator. This article describes the physics and design issues of a practical optical refrigerator for operation at 77 K. In particular, the Los Alamos Solid-State Optical Refrigerator
Bradley C. Edwards, Melvin I. Buchwald, Richard I. Epstein   +2 more
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Computational modeling the electrocaloric effect for solid-state refrigeration

MRS Proceedings, 2013
ABSTRACTThe electrocaloric effect holds promise for possible application in refrigeration technologies. There is much interest in this subject and experimental studies have shown the possibility for creating materials with a modest sized electrocaloric response.
J.A. Barr, T. Nishimatsu, S.P. Beckman
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