A New-PVE lubricant was developed for use with R32 refrigerant. R32 has been proposed as an alternative refrigerant for R410A refrigerant, to reduce global warming. In this report, we evaluated the relationship between the New-PVE lubricant and R32 and R410A refrigerants. The evaluation items were physical properties (miscibility, solubility, mixture viscosity and volumetric resistivity) and th...

The condensation heat transfer characteristics of nonazeotropic mixtures R1234yf and R32 (mass fractions of 0.52:0.48 and 0.77:0.23, respectively) inside a horizontal smooth tube (inner diameter 4 mm) were experimentally studied at mass fluxes ranging from 100 to 300 kg/m s. A prediction model for the forced convective condensation heat transfer characteristics of nonazeotropic refrigerant mixt...

As global warming has raised more critical concerns in recent years, refrigerants with high global warming potentials (GWP) are facing the challenges of being phased out. R410A, with a GWP of 2,088, has been widely used in residential air-conditioning and heat pump systems. A potential substitute for R410A is R32, which has a GWP of 675. This paper investigates the performance difference of R41...

As global warming has raised more critical concerns in recent years, refrigerants with high global warming potentials (GWP) are facing the challenges of being phased out. R410A, with a GWP of 2,088, has been widely used in residential air-conditioning and heat pump systems. A potential substitute for R410A is R32, which has a GWP of 675. This paper investigates the performance difference of R41...

X-ray analysis of two different trigonal crystal forms (space groups R32 and P3 ) of cyclic deoxytriadenylic acid [c(dAp)3] indicates for each an asymmetric unit consisting of two conformationally similar c(dAp)3molecules. Raman spectroscopy supports the X-ray interpretation for the R32 crystal, but identifies another c(dAp)3conformation not revealed in the P3 X-ray structure. The results for t...

In the present work, the integral equations method is used to calculate transport properties of polar fluids. For this goal, we use the Stockmayer potential and examine theoretically the thermal conductivity of several refrigerant mixtures such as R125+R134a, R125+R32, R125+R152a, R134a+R32, R152a+R32, R134a+R143a, and R125+R143a. We solve numerically the Ornstein-Zernike (OZ) equation usin...

Exploitation of ribozymes in a practical setting requires high catalytic activity and strong specificity. The hammerhead ribozyme R32 has considerable potential in this regard since it has very high catalytic activity. In this study, we have examined how R32 recognizes and cleaves a specific substrate, focusing on the mechanism behind the specificity. Comparing rates of cleavage of a substrate ...

Title of Dissertation: INVESTIGATION OF VAPOR INJECTION HEAT PUMP SYSTEM WITH A FLASH TANK UTILIZING R410A AND LOW-GWP REFRIGERANT R32 Xing Xu, Doctor of Philosophy, 2012 Dissertation Directed by: Professor Reinhard Radermacher Department of Mechanical Engineering Vapor injection technique has proven to be effective in improving heat pump system performance, especially for cooling application a...

Viscosity measurements of six binary mixtures R32+R1234yf and R32+R1243zf at different compositions were conducted in the homogenous liquid gas phases with a vibrating-wire viscometer temperature range from (254 to 383) K pressures (1 8) MPa. The measurement system was verified pure carbon dioxide R32 phases. relative combined expanded uncertainties (k = 2) experimental viscosity are generally ...

Average Nusselt numbers were measured for R22, R290, R290/600a, and R32/152a undergoing evaporation and condensation in a brazed plate heat exchanger. The refrigerants experienced wavy, stratified flow at low heat and mass fluxes, 1.3 kW/m2 to 8.3 kW/m2 and 1.6 kg/m2 s to 19 kg/m 2 s, respectively. Heat transfer correlations from the literature for in-tube and channel flow of refrigerants with ...