Results 171 to 180 of about 5,930 (210)
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Advanced Materials Research, 2012
A general air-source heat pump water heater originally designed to work with R134a was reconstructed as experimental rig for performance studies on systems using different refrigerants including R32, R134a and the mixture of R32/R134a which mass ratio is 1:5.
De Feng Ding +4 more
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A general air-source heat pump water heater originally designed to work with R134a was reconstructed as experimental rig for performance studies on systems using different refrigerants including R32, R134a and the mixture of R32/R134a which mass ratio is 1:5.
De Feng Ding +4 more
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Viscosity of R134a, R32, And R125 at Saturation
International Journal of Thermophysics, 1999This paper reports the results of the measurement of the viscosity of R134a close to the saturation line in the vapor phase. The new measurements were carried out in a vibrating-wire viscometer specially constructed for the purpose, and the results have an accuracy of ±2%.
C. M. B. P. Oliveira, W. A. Wakeham
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Viscosity measurements of R32 and R410A to 350 MPa
International Journal of Refrigeration, 2017Abstract Viscosity measurements were performed with a falling cylinder viscometer on difluoromethane (R32) and the refrigerant blend R410A (R32 + R125 with 50% by mass) at the temperatures 313.15 K, 348.15 K, and 393.15 K with pressures of 350 MPa. The measurement results are compared with literature data and with data calculated using an extended ...
Scott Bair, Arno Laesecke
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Measurements of the Surface Tension for the R290 + R32 Mixture
Journal of Chemical & Engineering Data, 2008There were no data of the surface tension for the R290 + R32 mixture which is expected as one of the new refrigerant mixtures, and its prediction is considered to be difficult because it is a mixture of a very polar molecule with a nonpolar molecule.
Katsuyuki Tanaka, Yukihiro Higashi
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Thermal conductivity of R32 and its mixture with R134a
International Journal of Thermophysics, 1995The liquid thermal conductivity of R32 (CH2F2) and R134a (CF3CH2F) was measured in the range from 223 to 323 K and from 2 to 20 MPa by the transient hot-wire method. The thermal conductivity of the R32+R134a mixture was also measured in the same range by varying the mass fraction of R32.
S. T. Ro, J. Y. Kim, D. S. Kim
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VLLE measurements and their correlation for the R32 + R600 system
Fluid Phase Equilibria, 2003Abstract Studies on VLE for the binary difluoromethane (R32)+propane (R290) system revealed the possibility of a liquid phase splitting at low temperatures. This was confirmed by successive measurements on the mutual solubility, and the upper critical solution temperature (UCST) was found at temperature T=230 K. A similar phase behaviour was expected
Bobbo S. +3 more
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International Journal of Thermophysics, 2008
The isochoric heat capacity (cv) of difluoromethane (R32) and a mixture of 51.11 mass% R32 + 48.89 mass% pentafluoroethane (R125) was measured at temperatures from 268 K to 328 K and at pressures up to 30 MPa. The reported density measurements are in the single-phase region and cover a range of ρ > 800 kg · m−3.
A. Matsuguchi, K. Yamaya, N. Kagawa
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The isochoric heat capacity (cv) of difluoromethane (R32) and a mixture of 51.11 mass% R32 + 48.89 mass% pentafluoroethane (R125) was measured at temperatures from 268 K to 328 K and at pressures up to 30 MPa. The reported density measurements are in the single-phase region and cover a range of ρ > 800 kg · m−3.
A. Matsuguchi, K. Yamaya, N. Kagawa
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The Thermal Diffusivity of the Refrigerants R32, R125, and R143a
International Journal of Thermophysics, 2002The thermal diffusivity of the halogenated fluorocarbons R32, R125, and R143a was systematically measured in a wide region of state around the liquid-vapor critical point using dynamic light scattering as the measuring method. The experimental setup is capable of measuring in homodyne (high light intensity) or heterodyne mode (low light intensity ...
M. Pitschmann, J. Straub
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International Journal of Refrigeration, 2013
Abstract This experimental study measured and compared the heat transfer coefficients during in-tube evaporation of R1234ze(E), R32, the nearly azeotropic HFC refrigerant blend R410A and a zeotropic mixture R1234ze(E)/R32 (55/45 mass %) inside a water heated double tube heat exchanger.
Md. Anowar Hossain +3 more
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Abstract This experimental study measured and compared the heat transfer coefficients during in-tube evaporation of R1234ze(E), R32, the nearly azeotropic HFC refrigerant blend R410A and a zeotropic mixture R1234ze(E)/R32 (55/45 mass %) inside a water heated double tube heat exchanger.
Md. Anowar Hossain +3 more
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