# Tag Info

### Would this work as a solid fuel heat engine that didn't need to boil water?

Your design can be approximated using the Brayton cycle with recuperation. Search on that for the details.

### Would this work as a solid fuel heat engine that didn't need to boil water?

The problem I can see is that there's no valve system to ensure that exhaust gases are directed to the decompressor. The entire interior of the engine will be at more or less the same pressure. The ...

### Would this work as a solid fuel heat engine that didn't need to boil water?

Every Jet-Engine works like that. They only miss the heat-exchanger.

### How to Link between Stoichiometry, Energy Content of a Fuel, Combustion in a Cylinder-Piston, and Otto-Cycle, Compression Ratio, & Thermal Efficiency?

Where is the combustion occurs in the Otto P-V diagram? At point 2? Yes Is that calculations from step 1 to step 10 correct? Maybe, but what are you trying to accomplish? It looks fine on the ...

### How to calculate the required power to pump out (to vacuum) a container?

Following on from @kamran's answer and ignoring the slight change in pressure as the 1 L piston moves, you can calculate the force required at each step as $F = \Delta P \times A$ (pressure ...
1 vote
Accepted

### What is the correct way to calculate the efficiency of a heat exchanger?

Effectiveness using $\epsilon = \frac{q_{act}}{q_{max}}$ seems to be most general. It assumes comparing 2 cases and I would choose comparing cases where inlet temperatures and flowrates are fixed for ...
Accepted

### Electricity generation from sand particles in airstream hitting surface

This seems to be your question: What if we use concentrated sunlight to heat air (e.g. to 300° C) and blow that air at high speeds to fire fine sand on some surface and continuously do so to generate ...

### What is the correct way to calculate the efficiency of a heat exchanger?

A good measure I think for what you need is Tout_Coldside/Tin_Hotside if you are trying to heat a cold fluid. Where if the Tout were equal to Tin_hotside then you would have a "100%" ...

### Electricity generation from sand particles in airstream hitting surface

The energy required to pick up and blow the filings at the surface will exceed the truly tiny amount of charge separation that this device will generate, so it is a net losing proposition. This is not ...

### Volume of air going through a hole with a temperature difference, and kWh of energy

One starting approximation can be using The air density difference as the driving force and equating the potential hydrostatic energy to the kinetic energy of the flow. Assuming h and P are equal on ...

### Stirling Engine Cooled Engine

Hypothetically yes. However the existing engine must run at a peak torque/rpm to run the engine to act as a heat pump. Much like turbochargers, some companies are installing a small battery to run the ...