W is the absolute value of the work done in one thermodynamic cycle. In mathematics, the absolute value (or modulus1) of a real number is its numerical value without regard to its sign. ... Work (abbreviated W) is the energy transferred by a force to a moving object. ...
Q is the absolute value of the change in heat done in one cycle.
In the thermodynamic method, pump or turbine efficiency is measured by means of temperature and pressure probes fitted to tapping points on the pump's inlet and outlet.
H is the pump total head in metres of water, vH is the velocity head in metres of water, n is the pump efficiency (in %), On is the Overall Efficiency (in %), q is the volume flow rate in l/s, and pw is the electrical input power to the motor, in kilowatts.
Thermodynamic flow meters have no moving parts, and their calibration can be checked on-site, over the operating range, by use of portable temperature, pressure, and power meter calibrators.
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