The Refrigerator With a COP Greater Than One
Refrigerator COP is not the same as thermal efficiency. A COP above one can be completely consistent with the first law.
Topic: Thermodynamics
The Turbine That Produced 1.2 MW From an Enthalpy Drop
For an adiabatic steady-flow turbine, an enthalpy drop becomes shaft work when kinetic and potential changes are negligible.
The Sealed Tank That Reached 150 kPa, Not 133
A rigid tank does not keep pressure constant. For an ideal gas, pressure tracks absolute temperature when mass and volume are fixed.