Research Article
Effects of Heat Transfer Characteristics of R32 and R1234yf with Al2O3 Nanoparticle through U-Bend Tube Evaporator
Table 4
Properties of R32, R134a, and R1234yf [
44–
46] at
and
, 0.2928, and 0.3158 MPa, respectively.
| Properties | R134a | R32 | R1234yf | Liquid | Vapor | Liquid | Vapor | Liquid | Vapor |
| Density (kg/m3) | 1294.8 | 14.428 | 1055 | 21.98 | 1176.3 | 17.64 | Specific heat, Cp (J/kg·K) | 1341 | 897.23 | 1745 | 1251 | 1289.3 | 926.18 | Thermal conductivity (W/m·K) | 0.0920 | 0.0115 | 0.1248 | 0.01284 | 0.0714 | 0.0116 | Viscosity (kg/m·s) | 0.000266 | 0.0000107 | 0.000124 | 0.00001228 | 0.000204 | 0.0000103 | Molecular weight (kg/kmol) | 102.03 | 102.03 | 52 | 52 | 114.04 | 114 | Surface tension (N/m) | 0.0114 | 0.0114 | 0.007 | 0.007 | 0.0094 | 0.0094 |
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