Thermal design method for heat exchangers by solution of five unique equations containing a minimum number of variables and involving tubeside, shell-side, tube-wall, and dirt resistance.


Related Terms

PLAN EQUATION

The mathematical statement that horsepower plan/33,000, where p mean effective pressure (pounds per square inch), l length of piston stroke (feet), a net area of piston (square inches), and n number of cycles completed per minute.

PIECEWISE LINEAR SYSTEM

A system for which one can divide the range of values of input quantities into a finite number of intervals such that the output quantity is a linear function of the input quantity within each of these intervals.

PHASE CONVERTER

A converter that changes the number of phases in an alternatingcurrent power source without changing the frequency.

PEG COUNT METER

A meter or register that counts the number of trunks tested, the number of circuits passed busy, the number of test failures, or the number of repeat tests completed.

PEDOMETER

1. An instrument for measuring and weighing a newborn child. 2. An instrument that registers the number of footsteps and distance covered in walking.

PARTICLE-SIZE DISTRIBUTION

The percentages of each fraction into which a granular or powder sample is classified, with respect to particle size, by number or weight.

PARALLEL FIRING

A method of connecting together a number of detonators which are to be fired electrically in one blast.

PACKING DENSITY

The number of devices or gates per unit area of an integrated circuit. packing ring See piston ring.

PACKAGING DENSITY

The number of components per unit volume in a working system or subsystem.

ON-STREAM FACTOR

The ratio of the number of operating days to the number of calendar days per year.

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