Recent content by Vedward

The circulator needs to be installed with the expansion tank connection on the suction.

I didn't read your last post, too complicated. The power of the stroke comes from the shoulders & arms which are well above the centerline of the kayak. This means a torque is being applied to the kayak. I can vision this as a rotation that causes the aft to drop, but since there are some many...

Try googling 'fan laws' - this should produce the equations used for fan design, power usage, static pressure drop, etc. In your specific case, if the flow into the fan is 48 mph, it could have an output of 98 mph, but this depends on the type of fan and arrangement. The types of fans include...

I worked for Electro-Motive for 20 years, the last ten in the Engine development Group. A locomotive is as complex as an airplane. Some of the separate design considerations are 1) power supply or engine; 2) transmission or power supply to the wheels; 3) platform design or the framework to...

Nozzles on rockets are designed for supersonic flow - the area decreases then increases as it reaches supersonic. The force of your propeller will be best if it has no resistance behind it, just be able to move the maximum amount of air to propel the car.

Also, fuel cell costs are decreasing, in the near future they may be able to match Diesel engines to power Railroad Locomotives for capital & operating costs. Watch out for hydrogen power in the future, but automobiles may be a way off for now.

If hydrogen is used in Otto cycle engines (regular automotive engines), it will burn air. Unfortunately air is mostly nitrogen, so some nitrogen will also burn, creating NOx compounds, a pollutant. It would be best to use it as a fuel for fuel cells, to generate electricity for electric cars...

One other thing, I've learned internal combustion engines (using Pistons ) only get 33% efficiencies, maybe a little more, of the energy of the fuel to the output. Only turbine with extra recovery systems can be higher than that.

The Stoichiometric ratio comes from the amount of oxygen needed to combine with all the carbon (to make CO2) and hydrogen (to make H2O) in the fuel on a theoretical basis, then since air is 22% oxygen, 78% nitrogen, the amount of air needs to be adjusted accordingly. I thought there needs to...

I always like to use the example of 50 rabbits into the pipe mean 50 rabbits out.

There are check valves with resilient seats which will accomplish this.

Fifty years ago in high school chemistry class, we did an experiment where we dissolved a compressed spring and an uncompressed spring in acid solutions. All started at the same temperature, but the compressed spring solution had a higher temperature, attributed to the energy (potential) in the...

Sounds interesting. How is the connecting rod from the cylinder connected to the gear? What are the dimensions of the rod to the center of the gear? With this information we can calculate your questions, but there may be some inefficiency and friction factors which will need to be estimated...

I looked in my old work files, it seems a 300 kW compressor needs about 20 kW cooling. This is from manufacturer's data, not computable from standard conditions. So the 6.8 l/s flow of glycol solution will be heated by 20 kW. When I was working, I did all my calculations in English units...

Some items needed: 1) flow rate of glycol & sea water 2) material being compressed 3) inlet & outlet temperatures of material being compressed Usually you can obtain the heat transfer requirements from the compressor supplier. Depending on the type of exchanger, step 2 could be 288 K...