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Rankine rotary expansion generator. David Wells and I have discussed the use of these expanders for use in Rankine engines.

Here is my concept. Take a Copeland Scroll Compressor complete with its 3 phase induction motor almost off the shelf. This complete assembly is in a sealed metal container.

If high pressure gas is connected to the expander it rotates and applies torque to the induction motor. The induction Beautiful thesis sites can be directly connected to the power grid.

One disadvantage of using the Copeland unit is the inability to use steam. The induction generator and bearings are exposed to the working fluid.

Steam will destroy these components. This requires fluids other than steam. Butane or pentane are also candidates. These fuel gases are a much better choice than the standard refrigerants primarily because of cost but also because they are non ozone depleting gases. The total system must be completely sealed to retain the gases.

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These gases are compatible with refrigeration oils which are used for scroll and bearing lubrication. The oil is pumped from the low pressure sump to the inlet where it passes through the scroll. This pump operates continuously whenever the expander is turning to provide lubrication.

Some of the oil will pass through the boiler as dissolved oil in the fluid and return as a mist which also passes through the scroll. The boiler must be designed properly to prevent oil accumulation.

One method could be the use of float type oil separators in low trap sections that let the oil pass through to the boiler outlet. A second pump pressurizes the condensate and injects it into the solar boiler.

The quantity of fluid injected is regulated by the quantity of fluid in the boiler. The objective is to make sure that the boiler is not so full as to let liquid pass out of the boiler and into the expander.

This would be called liquid slugging and is detrimental to the expander. The oil used in the system must be capable of sustained operating temperatures in excess of F.

The solar boiler has some special requirement and advantages over fired boilers. One of the biggest advantages of the solar boiler is the absence of high temperature corrosive flue gases.

If a fired boiler looses its water it could fail from high temperature weakening of the steel. The solar boiler will typically never get hot enough to be damaged. One of the biggest problems is caused when the sun is intermittently covered by clouds.

Fired boilers generally have steady heat inputs.Disclaimer: has a zero-tolerance policy against illegal pornography. All galleries and links are provided by 3rd parties.

We have no control over the content of these pages. We take no responsibility for the content on any website which we link to, .

A gallery of Wordpress sites using the popular Thesis Theme. Lancia (Italian:) is an Italian automobile manufacturer founded in by Vincenzo Lancia as Lancia & became part of the Fiat Group in ; the current company, Lancia Automobiles, was established in The company has a strong rally heritage and is noted for using letters of the Greek alphabet for its model names..

Lancia vehicles are no longer sold outside Italy and comprise.


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