DENSITY MEASUREMENTS OF LIQUID FUELS TO DETERMINE TEMPERATURE CONVERSION FACTORS FOR LEGAL METROLOGY

摘要

Worldwide there are great efforts to reduce the CO_2 emission into the atmosphere by using fuels made from biomass. These biofuels are normally blended with fossil fuels. For legal metrology the thermal expansion coefficient, the so-called temperature conversion factor, is of great importance to guarantee correct measurements of the fuel volume. Thus, the density of fossil fuels blended with biofuels was measured at the Physikalisch-Technische Bundesanstalt (PTB). Investigations were performed on mixtures of fossil petrol with ethanol and of fossil Diesel with biodiesel. The volume concentration of the biofuels component varied between 0% and 100% in order to have data available for all possible mixtures. The data were measured in a temperature range between -10 °C and +50 °C.