Results 121 to 130 of about 205 (173)

Condensation of zeotropic mixtures of low-pressure hydrocarbons and synthetic refrigerants

International Journal of Heat and Mass Transfer, 2020
Abstract Zeotropic mixtures are under consideration to replace pure working fluids for use in Organic Rankine Cycles for power generation from low-grade heat sources. An experimental investigation of the condensation heat transfer and frictional pressure drop of a zeotropic mixture of R245fa and n-pentane in smooth horizontal tubes was conducted ...
Jeffrey Milkie, Malcolm Macdonald, Srinivas Garimella   +2 more
exaly   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

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 ...
openaire   +1 more source

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
openaire   +1 more source

Review on Applications of Zeotropic Mixtures

Journal of Thermal Science, 2022
Mengjie Bai, Li Zhao, Ruikai Zhao
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

Heat pump control with zeotropic mixtures

1999
Zeotropic mixtures offer the possibility of being changed in composition by rectification methods which can be applied to the control of heat pump systems. Cycle calculations were done with various fluids commercially available in order to find the best mixture combination under the aspect of a wide control range as well as of a maximum achievable COP.
Halm NP, Kruse H, Bobbo S, Camporese R
openaire   +1 more source

Simulation of Isothermal and Adiabatic Leak Processes of Zeotropic Refrigerant Mixtures

HVAC&R Research, 1995
Nonflammable zeotropic mixtures of flammable and nonflammable refrigerants are possible alternative refrigerants for use in domestic heat pumps and air conditioners. Refrigerant leakage from such a system is of paramount concern since it is possible that a mixture composition will shift to a flammable range.
M. S. Kim, D. A. Didion
openaire   +1 more source