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56.0 55.5 55.0 54.5 54.0 53.5 53.0 1077 1077.5 1078 1078.5 1079 Density (kg/m^3) 1079.5 1080 1080.5 y = 0.7375x - 741.02 Figure C.2 Calculated concentration dependence on density with fixed temperature 3.255 3.250 3.245 3.240 3.235 3.230 3.225 3.220 3.215 3.210 3.205 53.0 53.5 54.0 54.5 55.0 Concentration (%) 55.5 56.0 y = -0.02x + 4.32 Figure C.3 Calculated specific heat dependence on concentration For glycol, the dependence of specific heat on temperature is a linear relationship. In order to calculate the heat removal rate by the glycol in the data reduction, an inlet and exit enthalpy is determined by integrating this line. Therefore, the uncertainty in the heat removal rate is a function of the uncertainty of the linear relationship between temperature and specific heat. This relationship is determined by fitting a line to a group of specific heats calculated for different temperatures of a fixed concentration in FluidFile. As a result, the uncertainty of the heat removal rate is a function of the uncertainty in the slope and intercept values determined by the best fit of this line. Because a change in concentration primarily shift the line up or down rather than changing the slope, it is assumed that the uncertainty in the intercept is equal to the uncertainty in specific heat, which results from the uncertainty in the concentration. As a result the uncertainty in the coefficients from the best fit line are equal to ± 0.01 kJ/kg K on the intercept (A), and to the statistical uncertainty of the slope of the line of best fit for the slope (B). 67 Specific Heat (kJ/kg k) Concentration (%)PDF Image | Comparison of R744 and R410A
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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