Solid–Liquid Equilibria for the CO2 + R143a and N2O + R143a Systems

Abstract

A recently built experimental setup for determination of solid-liquid equilibria was slightly modified. The action taken on the existing system focused on correcting the drawbacks of the cooling system. In this version of the setup, a direct liquid nitrogen supply was preferred. By means of the modified apparatus, solid-liquid equilibria of the CO 2 + R143a and N 2 O + R143a binary systems were studied. The triple point of R143a was measured to check the reliability of the modified apparatus, revealing good consistency with the literature. The system's behavior was measured down to temperatures of 148 K. The results obtained for the mixtures were interpreted by means of the Schröder equation.

Climate Change and Refrigerants: Thermodynamic Properties of Low-GWP Fluids for Domestic Applications and Binary Systems for Low-Temperature Options

“…Figure 2 shows the experimental setup. The detailed descriptions of the experimental setup and the testing procedure were reported in previous works [20][21][22]. Only summary information is included below.…”

Carbon Dioxide + Fluoromethane and Nitrous Oxide + Fluoromethane: Solid−Liquid Equilibria Measurements

“…An absolute pressure transducer (HBM, Mod. P8A) (4) was installed in the charging tube. A mass flow control (5) was installed upstream from the dehumidifier: a needle valve with a shutter was used to adjust the flow rate coming from the dry air supplier (6), as measured by means of the pressure difference read on a pressure gauge alongside it.…”

“…The lower temperatures needed in some applications can be achieved by using blends. That is why we recently turned our attention to (carbon dioxide and nitrous oxide) + hydrofluorocarbon (HFC) mixtures − as potentially suitable working fluids in low-temperature refrigeration applications.…”

“…Recently, our lab measured the SLE of several (CO 2 and N 2 O) + HFC binary systems. − To study the behavior of the binary systems in terms of the Raoult’s and Dalton’s laws, the PVTx of CO 2 + R41 and N 2 O + R41 were recently studied by the same lab with isochoric and Burnett apparatuses, − but no information on the SLE of both title systems is available in the literature. The present study was also undertaken to fill this gap.…”

Solid–liquid equilibria for the dimethyl ether + carbon dioxide binary system

“…But, in a fact, the SLE for mixtures containing HFCs refrigerants are extremely scarce in literature. Recently, our lab measured the SLE of several (CO 2 and N 2 O) + HFCs binary systems [6][7][8][9][10]. In this paper, the SLE for CO2 + DME binary system was measured down to temperatures of 131.6 K.…”