Measurement of the Heat Capacities of Pure and Mixed Refrigerants.
Measurement of the Heat Capacities of Pure and Mixed
Thermophysical Properties, 10th Symposium. Proceedings.
June 20-23, 1988, Gaithersburg, MD, 1988.
Sponsor:National Institute of Standards and Technology,
refrigerants; heat capacity; calorimeters; hydrocarbons;
liquid phases; vacuum chambers; specific heat; fluids;
A flow calorimeter was designed and built to measure the
heat capacity of pure and mixed halogenated hydrocarbons
in the liquid phase. The calorimeter is an electrically
heated, coiled tube located inside a vacuum chamber in
the water bath. The liquid under investigation is pumped
by means of a syringe pump through the calorimeter and
then collected in a pressure container located in dry
ice to ensure a constant back pressure. The temperature
difference is measured with a thermopile made of wire of
0.002 inch in diameter, and the flow rate is determined
by weighing of the sample. The calorimeter was
calibrated using water, refrigerant 11, refrigerant 22,
and ethylene glycol. The measurement error is - 1%.
Results are reported for the pure refrigerants R114,
R123, R142b and R152a, and the mixtures R22/R114,
R22/R142b and R22/R152a.