Results 151 to 160 of about 703,374 (204)

Nucleate Pool Boiling of Binary Zeotropic Mixtures

Heat Transfer Engineering, 2004
This article deals with an experimental study of pool boiling of acetone/water and propane/isobutane zeotropic mixtures. Water and acetone form non-ideal mixtures characterized by a very wide phase equilibrium diagram. Propane and isobutane, which are alkanes with very close thermophysical properties, form nearly ideal mixtures. The whole nucleate pool
SERGE CIOULACHTJIAN, MONIQUE LALLEMAND
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Calculating Circulation Concentration of Zeotropic Refrigerant Mixtures

HVAC&R Research, 1995
The circulation concentration of a zeotropic refrigerant mixture may differ from the refrigerant bulk concentration in a vapor compression cycle. The difference, defined as “concentration shift,” is mainly caused by the differential holdup in two-phase regions and the differential solubility of the oil.
J. Chen, H. Kruse
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Composition Optimization of Zeotropic Mixtures for ORC Systems Considering Constraints

2021
Organic Rankine Cycle (ORC) processes are used to convert low-temperature waste heat into electricity. Often, these sources and sinks are sensible heat flows. In such a case, it may be appropriate to adapt the cycle process to these external temperature characteristics. This can be realized with zeotropic mixtures as a working fluid and evaluated by an
Bederna, Benedikt Gregor, Barta, Riley Bradley, Hesse, Ullrich   +2 more
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Distillation trajectories for the first-class fractionation of zeotropic mixtures

Theoretical Foundations of Chemical Engineering, 2011
Phase portraits of distillation trajectories for first-class fractionation are considered for three-component mixtures, including the case of the feed composition belonging to an α = 1 manifold.
L. A. Serafimov, A. V. Timoshenko, K. Yu. Tarkhov   +2 more
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Performance Assessment of Zeotropic Mixtures for Heat Pump Water Heaters

Journal of Thermophysics and Heat Transfer, 2022
The subcritical cycle performances of eco-friendly pure refrigerants and zeotropic mixtures for heat pump water heater systems were performed by MATLAB programs.
Nuochen Zhang, Yuande Dai
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Zeotropic Mixture and Organic Ranking Cycle

2016
The Intergovernmental Panel on Climate Change (IPCC) reported in 2014 that scientists were more than 95 % certain that most of global warming is caused by increasing concentrations of greenhouse gases [1]. Since the Second Industrial Revolution, steam Rankine cycle driven by fossil fuel has become the dominant method of power supply, and the ...
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Occurrence of pinch points in condensers and evaporators for zeotropic refrigerant mixtures

International Journal of Refrigeration, 1996
Abstract Many zeotropic refrigerant mixtures are being proposed as alternatives to some CFCs and HCFCs. One of the advantages of zeotropes is the possibility of reduction in entropy generation by matching the temperature glides of refrigerant and heat-transfer fluid in both condenser and evaporator. However, perfect glide matching may not be possible
G Venkatarathnam, Girish Mokashi, S.Srinivasa Murthy   +2 more
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Review on Applications of Zeotropic Mixtures

Journal of Thermal Science, 2022
Mengjie Bai, Li Zhao, Ruikai Zhao
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Flow Boiling of Zeotropic Refrigerant Mixture R456a in Microchannels

ASME 2024 7th International Conference on Micro/Nanoscale Heat and Mass Transfer
Abstract Zeotropic refrigerant mixtures are widely considered as the alternatives to refrigerants currently used in vapor-compression refrigeration systems for the purpose of lowering GWP. Microchannel heat exchangers prove to be highly efficient and compact.
Yu Xia, Dilara Suulker, Zhen Long, Hua Sheng Wang   +3 more
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Modeling of Two-Phase Heat Exchangers With Zeotropic Fluid Mixtures

Journal of Heat Transfer, 2018
Heat exchangers are important components in many engineering applications. This paper proposes a numerical two-phase heat exchanger model with simultaneous heat transfer and pressure drop calculations. The presented model provides a modeling framework compatible with numerous different correlations for both single- and two-phase flow of pure fluids and
Gomse, D., Kochenburger, T. M., Grohmann, S.   +2 more
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