Method of measuring heat influx of a cryogenic transfer system
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsRalph C. Niemann, Steven A. Zelipsky, Ronald R. Rezmer, Peter Smelser
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Abstract
A method is provided for measuring the heat influx of a cryogenic transfer system. A gaseous phase of the cryogen used during normal operation of the system is passed through the system. The gaseous cryogen at the inlet to the system is tempered to duplicate the normal operating temperature of the system inlet. The temperature and mass flow rate of the gaseous cryogen is measured at the outlet of the system, and the heat capacity of the cryogen is determined. The heat influx of the system is then determined from known thermodynamic relationships.
Claims9
A method for measuring the heat influx of a cryogenic transfer system comprising the steps of:
- establishing a flow of gaseous cryogen through said transfer system;
- measuring the temperature of said gaseous cryogen at an inlet and an outlet of said transfer system;
- measuring the mass flow rate of said gaseous cryogen;
- calculating the heat capacity of said gaseous cryogen;
- and
- calculating the heat influx of said transfer system by using the equation ##EQU2## where Q is the heat influx to the transfer system, m is the mass flow rate of gaseous cryogen through the system, C.sub.p is the specific heat capacity at constant pressure of the gaseous cryogen, T.sub.i and T.sub.o are the inlet and outlet temperatures of the transfer system, respectively, and dT is the temperature differential along the transfer system.
Dependencies are inferred from the claim text.