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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 generator 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.
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.Thesis by Katsuaki Tanabe In Partial Fulfillment of the Requirements for the Degree of Such a wafer bonding approach can also be applied to other photovoltaic heterojunctions where lattice mismatch accommodation is also a challenge, such as the InGaAs solar cells on InP have superior performance to Ge cells at photon.
design of PV solar cells and systems. It is written to address several 2 Basic Photovoltaic Principles and Methods. Page However, there are ambivalent views about solar, or photovoltaic, cells' ability to supply a significant amount of energy relative to global needs.
Understanding Organic Photovoltaic Cells: Electrode, Nanostructure, Reliability, and Performance by Myung-Su Kim A dissertation submitted in partial fulfillment.
The number of venture capital firms interested in energy is growing rapidly. This is a list of firms that have invested in energy companies or are taking time to investigate the space.
master thesis analysis and evaluation tools development of photovoltaic modules and system performance under jordanian and german climatic conditions.
This thesis will introduce the principle of solar photovoltaic, the composition and operation of the solar photovoltaic system, the maintenance of solar photovoltaic system and the background of the use of solar power in the world.