An Improved Procedure for the Determination of Ferrous Iron Mass Fraction in Silicate Rocks Using a Schlenk Line-Based Digestion Apparatus to Exclude Oxygen

2017 ◽  
Vol 41 (3) ◽  
pp. 411-425 ◽  
Author(s):  
Dingshuai Xue ◽  
Hongyue Wang ◽  
Yanhong Liu ◽  
Liewen Xie ◽  
Ping Shen
Keyword(s):  
Ferrous Iron ◽  
Mass Fraction ◽  
Silicate Rocks

Determination of ferrous iron in silicate rocks

1984 ◽  
Vol 42 (1-4) ◽  
pp. 343-347 ◽  
Author(s):  
Samuel S. Goldich
Keyword(s):  
Ferrous Iron ◽  
Silicate Rocks

Precise determination of ferrous iron in silicate rocks

2002 ◽  
Vol 66 (6) ◽  
pp. 1085-1093 ◽  
Author(s):  
Tetsuya Yokoyama ◽  
Eizo Nakamura
Keyword(s):  
Ferrous Iron ◽  
Precise Determination ◽  
Silicate Rocks

scholarly journals New HFC/HFO Blends as Refrigerants for the Vapor-Compression Refrigeration System (VCRS)

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 946
Author(s):  
Bartosz Gil ◽  
Anna Szczepanowska ◽  
Sabina Rosiek
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Mass Fraction ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Operational Parameters ◽  
Vapor Compression Refrigeration ◽  
Low Global Warming Potential ◽  
Triangular Design

In this work, which is related to the current European Parliament Regulation on restrictions affecting refrigeration, four new three-component refrigerants have been proposed; all were created using low Global Warming Potential(GWP) synthetic and natural refrigerants. The considered mixtures consisted of R32, R41, R161, R152a, R1234ze (E), R1234yf, R1243zf, and RE170. These mixtures were theoretically tested with a 10% step in mass fraction using a triangular design. The analysis covered two theoretical cooling cycles at evaporating temperatures of 0 and −30 °C, and a 30 °C constant condensing temperature. The final stage of the work was the determination of the best mixture compositions by thermodynamic and operational parameters. R1234yf–R152a–RE170 with a weight share of 0.1/0.5/0.4 was determined to be the optimal mixture for potentially replacing the existing refrigerants.

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