Miscibility Measurement and Evaluation for the Binary Refrigerant Mixture Isobutane (R600a) + 1,1,1,2,3,3,3-Heptafluoropropane (R227ea) with a Mineral Oil

2015 ◽  
Vol 60 (6) ◽  
pp. 1781-1786 ◽  
Author(s):  
Zhao Yang ◽  
Tian Tian ◽  
Xi Wu ◽  
Rui Zhai ◽  
Biao Feng
Keyword(s):  
Mineral Oil ◽  
Refrigerant Mixture ◽  
Measurement And Evaluation ◽  
Binary Refrigerant

Behavior and Performance of Refrigerant Mixture HFC125/HC290 in Heat Pumps

2013 ◽  
Author(s):  
Xiaowei Fan ◽  
Fang Wang ◽  
Huifan Zheng ◽  
Xianping Zhang ◽  
Di Xu
Keyword(s):  
Energy Consumption ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Environment Friendly ◽  
Factors Affecting ◽  
Refrigerant Mixture ◽  
Important Direction ◽  
Overall Performance ◽  
And Performance ◽  
Binary Refrigerant

The refrigerant mixtures provide an important direction in selecting new environment-friendly alternative to match the desirable properties with the existing halogenated refrigerants or future use in the new devices, in which, HFCs refrigerants with zero ODP combined with HCs refrigerants with zero ODP and lower GWP are of important value in the fields of application. In the present work, research on HFC125/HC290 (25/75 by mass) binary refrigerant mixture used in heat pumps was carried out, and parameters, factors affecting the performance were investigated, and compared with that of HCFC22 under the same operating conditions. It has been found that the new mixture can improve the actual COP by 2 to 13% and hence it can reduce the energy consumption by 20 to 31.5%. The overall performance has proved that the new refrigerant mixture could be a promising substitute for HCFC22.

A Performance Evaluation of Heat Pump Cycle for the Binary Refrigerant Mixture R134a/R123

Heat Pumps ◽  
1990 ◽  
pp. 693-701
Author(s):  
M. NAKAIWA ◽  
M. OWA ◽  
T. AKIYA ◽  
M. SATO ◽  
T. HAKUTA ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Heat Pump ◽  
Refrigerant Mixture ◽  
Binary Refrigerant ◽  
A Performance

Falling Film Evaporation of Binary Refrigerant Mixture in Vertical Rectangular Minichannels Consisting of Serrated-Fins

2014 ◽  
Author(s):  
Junichi Ohara ◽  
Shigeru Koyama
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Mass Fraction ◽  
Mass Velocity ◽  
Falling Film ◽  
Film Evaporation ◽  
Refrigerant Mixture ◽  
Falling Film Evaporation ◽  
Binary Refrigerant

The characteristics of heat transfer are investigated experimentally for the vertical falling film evaporation of binary refrigerant mixture HFC134a/HCFC123 in a rectangular minichannels consisting of offset strip fins. The refrigerant liquid is uniformly supplied to the channel through a distributor. The liquid flowing down vertically is heated electrically from the rear wall of the channel and evaporated. To observe the flow patterns during the evaporation process directly, the small circular window is set at the center of every section on the front wall. The experimental parameters are as follows: the mass velocity G = 28∼70 kg/(m2s), the heat flux q = 30∼50 kW/m2 and the pressure P ≈ 100∼260 kPa. In the case of large mass velocity G ≥ 55 kg/(m2s), the value of heat transfer coefficient becomes lower with increase of mass fraction of low-boiling component HFC134a wb in the region of x ≥ 0.3. The main reason for this inclination of α is considered that shearing force acts on the liquid-vapor interface becomes smaller because of vapor velocity suppressed by higher pressure in the test evaporator in the case of larger mass fraction of low-boiling component. Additionally, mass diffusion resistances formed on each side of vapor and liquid phase along the liquid-vapor interface are considered as a possible cause of reduction in the heat transfer coefficient α with increase of mass fraction wb. In the region of x ≥ 0.8, α descend rapidly despite the difference in the value of wb. It can be attributed to dry-out state of heat transfer area. Heat transfer coefficient derived from experiments is compared with that calculated from empirical correlation equation for heat transfer coefficient of pure refrigerant in a vertical falling film plate-fin evaporator.

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