Talk:Solar Combined Heat Power System
BLT Outlet Design: Just an observation concerning the purposed outlet design as shown in the CAD images and also in the model used in the Numerical Simulation (Tesla Turbine - 1913) study.
There are various ways to do this but a circular housing concentric around the axis with tangential exhaust pipes is one of the worst - as was pointed out in the Simulation study. If you must use the circular housing then make it longer, and slightly increase its diameter as it emerges to help slow the rotational speed, somewhat like a divergent nozzle. Then place a baffle plate, a disc with numerous holes in it, prior to the end cap. The space between the baffle and the end cap will serve as a form of static reservoir from which to draw off the exhaust conventionally.
The simplest exhaust design is basically the fluid-dynamically acceptable volute shape used in the boundary layer fan / pump designs.
The efficiency computation is completely wrong!
Claiming 90% turbine efficiency will completely discredit the project in the eyes of experts. What about Carnot efficiency? What is the working temperature?
From real engineering computations and what I know about Tesla turbines, you will be happy if you can get 10% heat-to-mechanical work efficiency. Anyway, don't expect much more than that for small installations.
For a prototype, I will give you all the quality credit if you can get 5% global heat-to-electricity efficiency.
Also, the collector efficiency estimation is too optimistic. There are also mirror reflectivity loss (15%), interception factor loss (depending on the optical precision), endloss (depending on geometry and orientation), cosine loss (depending on orientation and location). You will get bad surprises when you realise the project!
and loss from dirt on the reflectors and glazing
NT 09:46, 19 March 2010 (UTC)
