ASME PTC-50 pdf download FUELCELL POWERSYSTEMS PERFORMANCE
This Code applies to all fuel cell power systems regardless of the electrical power output, thermal output, fuel cell type, fuel type, or system application.
Fuel cell power systems contain an assembly of electrochemical cells, which oxidize a fuel to gener- ate direct current electricity. Balance-of-plant subsys- tems may include controls, thermal management, a fuel processor and a power conditioner. Some fuel cell power systems may contain additional power generating equipment such as steam generators, gas turbine generators, or micro-turbine generators. The net power output and all the fuel input to the system shall be taken into account in the performance test calculations.
This Code applies to the performance of overall fuel cell power systems. The Code addresses com- bined heat and power systems, that is, the generation of electricity and usable heat at specific thermal conditions. It does not address the performance of specific subsystems nor does it apply to energy storage systems, such as regenerative fuel cells or batteries. It also does not address emissions, reliabil- ity, safety issues, or endurance.
This Code contains methods and procedures for conducting and reporting fuel cell system testing,including instrumentation to be used, testing tech- niques, and methods for calculating and reporting results. The Code defines the test boundary for fuel and oxidant input, secondary energy input and net electrical and thermal energy output. At these boundaries, this Code provides procedures for measuring temper- ature, pressure, input fuel flow and composition, electrical power, and thermal output.
The Code provides procedures for determination of electrical efficiency or heat rate and overall thermal effectiveness at rated or any other steady-state condition. The Code also provides the method to correct results from the test to reference conditions.
1.3 TEST UNCERTAINTY In accordance with ASME PTC 1 9.1 , procedures are provided for determining the uncertainty associ- ated with the calculated performance parameters of this Code (energy input, electrical energy and thermal outputs, and electrical efficiency or heat rate). In the measurements made to determine performance parameters, there are systematic errors produced by the procedures and instrumentation recommended in this Code. A table of these systematic errors may be found in Section 4 of this Code.
Sample calculations of the uncertainties associated with the system performance parameters, which illus- trate the effects of systematic errors and data, are presented in Mandatory Appendix I of this Code.