ASME PTC 50:2002 pdf free download

ASME PTC 50:2002 pdf free download.FUEL CELL POWER SYSTEMS PERFORMANCE.
influence coefficient: the ratio of the change in a result to a unit change in a parameter.
instrument: a tool, or device used to measure physical dimensions of length, thickness, width, weight or any other value of a variable. These variables include: size, weight, pressure, temperature, fluid flow, voltage, electric current, density, viscosity, and power. Sensors are included which may not, by themselves, incorporate a display but transmit signals to remote computer type devices for display, processing or process control. Also, included are items of ancillary equipment directly affecting the display of the primary instrument (e.g., ammeter shunt), and tools or fixtures used as the basis for determining part acceptability.
low heating value (LHV.1: the heat of combustion, per unit quantity of fuel when all combustion product water is assumed to remain as vapor. This is the lowest possible heat of combustion of a particular fuel at specified conditions and when used in calculations results in the highest values of power plant efficiency.
measurement error (6): the true, unknown difference between the measured value and the true value.
net power: the electrical power leaving the test boundary minus any electrical power entering the test boundary.
parasitic power energy produced by the power plant and used within the fuel cell system.
precision error: see random error.
primary vanables: those used in calculations of test results. They are further classified as:
(a) Class 1. Primary variables are those that have a relative sensitivity coefficient of 0.2 or greater.
(b) Class 2. Primary variables are those that have a relative sensitivity coefficient of less than 0.2.
Refer to ASME PTC 19.1 for calculations of relative sensitivity coefficients.
random error fr): sometimes called precision error; the true random error, which characterizes a member of a set of measurements. (varies in a random, Gaussian (normal) manner, from measurement to measurement).
rated power: the power output of the power system when operating at specified control and ambient conditions.
secondary energy inputs: energy streams, exclusive of the heating value of main fuel supply crossing into the power plant boundary to support fuel cell systems.
secondary outputs: any useful nonelectrical energy output stream which is used by an external process.
secondary variables: variables that are measured but do not enter into the calculation.
secondary thermal energy inputs: the additional heat inputs to the test boundary which must be accounted, such as cycle makeup and process condensate return.
sensitivity: see influence coefficient.
serialize: means an instrument has been assigned a unique number and that number has been permanently inscribed on or to the instrument so that it can be identified and tracked.