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A new flow calorimeter Ibr measuring isobaric enthalphy increme.lt and JouleThomson efl~:ct was built :rod tested during the period 1987-1993. The calorirneter has several features that reduce the heat leakage better than previous designs: this includes thermal shields cooled by propane, a heat sink, and superinsulation on all piping. The temperature and pressure range covered by the calorimeter is 133 to 343 K and 0.17 to 14 MPa. Measurements on a mixture of 68.32'!/,, methane and 31.68 % propane are presented. The enthalpy increment measurements have an average standard uncertainty of 0.08 kJ-kg ~, or 0.22% of the enthalpy increment.

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