Acro Solar Steam Engine


This is a clip of our new prototype rotary steam engine running in the sun for the first time. We knew it would run, but not as fast as it did! There is no load on the motor shown here, but the results are promising. Solar companies Melbourne Its in it’s early stages and we will have new footage soon with a modified boiler employing a glass tube bundle in the focal point before heat receiver to spoil loss due to wind, which will achieve even higher temperatures and speeds.

How does it work and what is it doing?
This demonstrations shows an open loop test, meaning the source water feed, which is the small tank, is not replenishing itself or recirculating. Recirculation would be forced in a closed loop system by means of a small pump. The video shows a small steel water tank. It holds approximately 1.5 gallons of water. An intake port on the tank provides 100 lbs. of air coming from a shop air compressor to pressurize the tank. Water is forced out of tank through a port down low and passing through a temporary valve we can use to adjust flow manually. The flow out of the tank leading to the boiler is high pressure but low volume.

Water then continues through a hose and into the boiler where it quickly turns into steam and is fed into a rotary motor rated at . 5 horsepower and turns at 15,000 plus rpm’s. The exhaust continues back down and a way from the boiler as steam, an expanded gas. In our closed loop system we are currently developing, the gas will run through a condenser inline with a high pressure low power pump, and back to the tank. The back of the boiler shows the motor with shaft and mount available for direct coupling of an electrical generator or A/C compressor. Both systems are being tested now. The tracking computer is being modified to accommodate new temperature sensors and failsafe circuits as well as monitoring circuits.

As the video starts you can hear the shop air compressor running, charging the tank, but you can hear the motor winding away in the distance. The sound is coming from the open exhaust and you can see steam being forced out. The motor is itself virtually silent. Since the sound is coming out of the return exhaust line, in the typical closed loop system application, you would not hear this noise because there is no exhaust. Check back with us for the latestAcro News and developments.