Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Low global warming potential"”.
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Heat transfer performance and prediction of low global warming potential R134a refrigerant alternatives
… environmental regulations are phasing out high global warming potential (GWP) refrigerants such as R134a. Since many potential alternative refrigerants have flammability and cost concerns, minimizing system charge is critical. The condenser is typically responsible for 50% of the charge of a …
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Analysis and optimization of a dual-load vapor compression cycle using non-azeotropic refrigerant mixtures
… Mixtures (NARMs) have been identified as potential replacements for R12 because of their low ozone depletion potential, low global warming potential and promising thermodynamic characteristics which could improve cycle efficiency. A NARM experiences a variable temperature glide during a …
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Calculation of Electron Collision Cross Sections in Fluorinated Nitrile (C4F7N) and its Dissociation Fragments
… gas due to its higher dielectric strength and low global warming potential relative to SF6. To evaluate the behavior of this novel gas during high-voltage gaseous discharges, plasma models require electron-neutral collision cross sections to calculate parameters such as transport coefficients. …
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Nanoscale modification of key surface parameters to augment pool boiling heat transfer and critical heat flux in water and dielectric fluids
… constituency on boiling mechanisms is revealed. Low surface tension dielectric fluids, including a recently developed fluorinated ketone with a low global warming potential, are tested to determine their pool boiling heat transfer capabilities. The potential for nanoparticle-based pool boiling …
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Design and Lab Implementation of an Air Source Transcritical CO2 Heat Pump
… was developed to evaluate the performance of low-global-warming-potential (GWP) refrigerants for cold climate applications. A custom climate chamber was also constructed to simulate winter weather conditions typical of the northeastern United States. Both the TCHP and the chamber were fully …
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Oil retention and pressure drop of R1234yf and R134a with POE ISO 32 in suction lines
… the compressor due to which it has the highest potential for oil retention. R1234yf is a new alternative refrigerant of low global warming potential (GWP) which has been developed for automobile air conditioners as a drop-in replacement for R134a in order to meet European Union’s low GWP …
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TRANSIENT PERFORMANCE EVALUATION OF AUTOMOTIVE SECONDARY LOOP SYSTEMS
… refrigerants, such as R152a or R290, have a low Global Warming Potential, their flammability requires secondary loop systems to be used. The added thermal mass of such systems may increase power consumption and delay cool down while benefitting thermal comfort during start/stop operation. The …
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Investigation of oil retention and pressure drop in suction lines using R1234yf, R134a and R410A with POE ISO 100
… drop in suction lines using R1234yf, the low Global Warming Potential (GWP) refrigerant which was developed as a consequence of the European Union’s Mobile Air-Conditioning Directive. Tests were conducted in 10.2 mm internal diameter horizontal and vertical suction lines that were about 2 …
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Experimental investigation and mathematical modelling of dynamic equilibrium of novel thermo-fluids for renewable technology applications
… problems. Solar thermal energy has a potential to diminish the dependency on fossil fuels and reduce CO2 emissions in which solar radiation is converted to heat via a thermal fluid for power and heat generation. Medium and high-temperature solar thermal systems where concentrated …