a) The pump does add a tiny amount of heat to the water passing through it : the input temperature should be measured AFTER the pump.
b) There is FRICTIONAL loss in a pipe
http://www.efunda.com/formulae/fluids/calc_pipe_friction.cfm
(Though in that calculation it's expressed as pressure drop).
223.00-3 Fluid Mechanics - Course 223 FRICTION IN FLUID FLOW
http://canteach.candu.org/library/20040303.pdf
Example 3 calculates the energy loss. 124 J / kg for a honking big oil pipe.
I haven't plugged in the ecat numbers.
These aren't going to be anywhere near the measured power level.
Hey! Another fake-let !!!
c) The water could drive an internal turbine, generating heat directly (friction) or indirectly (generator connected to a resistor).
