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Environmental Profiles of Stirling-Cooled and Cascade-Cooled Ultra-Low Temperature Freezers
Berchowitz, David M.; Kwon, Yongrak - In: Sustainability 4 (2012) 11, pp. 2838-2851
research organizations is investigated. These freezers, employing the cascade refrigeration system, use between 10 and 20 times … freezers by 50% or more. The cascade and Stirling systems are compared for equivalent sized freezers in terms of embodied … energy and equivalent CO<sub>2</sub> production from cradle to gate and use, including total equivalent warming impact (TEWI …
Persistent link: https://www.econbiz.de/10011030317
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Thermodynamic analysis of carbon dioxide blends with low GWP (global warming potential) working fluids-based transcritical Rankine cycles for low-grade heat energy recovery
Dai, Baomin; Li, Minxia; Ma, Yitai - In: Energy 64 (2014) C, pp. 942-952
Carbon dioxide is a promising natural working fluid that can be used in transcritical Rankine cycles due to environmental and safety concerns. However, the high operation pressure has to be reduced and the relatively low efficiency of the system has to be increased. Traditional working fluids...
Persistent link: https://www.econbiz.de/10010812004
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Experimental study of R152a and R32 to replace R134a in a domestic refrigerator
Bolaji, B.O. - In: Energy 35 (2010) 9, pp. 3793-3798
This paper presents an experimental study of R152a and R32, environment-friendly refrigerants with zero ozone depletion potential (ODP) and low global warming potential (GWP), to replace R134a in domestic refrigerator. A refrigerator designed and developed to work with R134a was tested, and its...
Persistent link: https://www.econbiz.de/10010807359
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An experimental evaluation of the greenhouse effect in the substitution of R134a with CO2
Aprea, C.; Greco, A.; Maiorino, A. - In: Energy 45 (2012) 1, pp. 753-761
determined by the experimental evaluation of the TEWI index (Total Equivalent Warming Impact) that takes into account both direct …744 system working in a trans-critical cycle. The experimental results clearly show that the latter has a larger TEWI than …
Persistent link: https://www.econbiz.de/10010807922
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An experimental investigation of the global environmental impact of the R22 retrofit with R422D
Aprea, Ciro; Maiorino, Angelo - In: Energy 36 (2011) 2, pp. 1161-1170
, we report an experimental analysis in terms of TEWI aimed to identify the global environmental impact of R22 systems … confirmed that the system, when retrofitted with R422D, leads to an increase of TEWI. Therefore an optimization analysis aimed …
Persistent link: https://www.econbiz.de/10011053139
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The Lehman Brothers Effect and Bankruptcy Cascades
SIECZKA, Pawel; SORNETTE, Didier; HOLYST, Janusz A. - 2010
Inspired by the bankruptcy of Lehman Brothers and its consequences on the global financial system, we develop a simple model in which the Lehman default event is quantified as having an almost immediate effect in worsening the credit worthiness of all financial institutions in the economic...
Persistent link: https://www.econbiz.de/10008922931
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Cascade wind turbines for the oscillating water column wave energy device: Part 1
Ghosh, Kunal - In: Renewable Energy 9 (1996) 1, pp. 1219-1222
vertical axis wind turbine is pointed out. A novel cascade wind turbine which is simple and at the same time can accept wind …
Persistent link: https://www.econbiz.de/10010807196
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Magnetocaloric effect: A review of the thermodynamic cycles in magnetic refrigeration
Romero Gómez, J.; Ferreiro Garcia, R.; De Miguel … - In: Renewable and Sustainable Energy Reviews 17 (2013) C, pp. 74-82
Magnetic refrigeration (MR) at room temperature is an emerging technology and shows real potential to enter conventional markets. The principle of MR obeys the magnetocaloric effect (MCE), which is based on the effect caused by a magnetic field on the materials that bear the property of varying...
Persistent link: https://www.econbiz.de/10011049389
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Exergy Assessment of Recovery Solutions from Dry and Moist Gas Available at Medium Temperature
Ayachi, Fadhel; Ksayer, Elias Boulawz; Neveu, Pierre - In: Energies 5 (2012) 3, pp. 718-730
, operating as simple and cascade cycles, were investigated. Combined exergy analysis and pinch optimization was performed to …
Persistent link: https://www.econbiz.de/10011030792
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Anomalous scaling in a shell model of helical turbulence
Ditlevsen, P.D; Giuliani, P - In: Physica A: Statistical Mechanics and its Applications 280 (2000) 1, pp. 69-74
In a helical flow there is a subrange of the inertial range in which there is a cascade of both energy and helicity. In … this range the scaling exponents associated with the cascade of helicity can be defined. These scaling exponents are …
Persistent link: https://www.econbiz.de/10010590362