Lab · Thermal Engineering
Energy Devices Lab
One stream through one steady-flow control volume. Pick the device, state the inlet and outlet, and read the energy flows, the term-by-term balance and both states from the same solution.
Control volume
q − ws = Δh + ΔV²/2 + gΔz (rate form × ṁ). q, Q̇ > 0 is heat into the control volume; ws, Ẇs > 0 is shaft work done by the fluid on the surroundings.
Shaft power output Ẇs (produced)
980 kW
Specific shaft work ws = 490 kJ/kg. Positive = useful power produced.
Energy flow
| Q̇ (into CV) | 0 W |
|---|---|
| Ẇs (out of CV) | 980 kW |
| ṁ | 2 kg/s |
| V1 → V2 | 50 m/s → 150 m/s |
Dashed box: control volume. Stream enters at 1 and leaves at 2. Heat arrows point into the CV when q, Q̇ > 0; shaft-work arrows point out of the CV when ws, Ẇs > 0. A zero term draws no arrow.