Micro CoGen.

http://sco.lt/6Uug65
>3000 watts is power to supply whole family house. What to do with the heat produced in spring, fall or summer time. I am thinking about sistem what is able to supply necessary accesories like lights during the blackout. The most important accessories are circulating pumps of the heating system during the winter time. They can by supply by micro power plant and whole heating system can be independnt from public network.   

http://sco.lt/5wEMq1

See the link over. This is an article why is the ORC a perspective energy "recovery" system.
It also argue that it is cheap and economic.
But the micro scale version with around 50-100 watts nett output power is not so economically recoverable.

That is the reason I am trying to create an DIY system.

Hi hwew,

thanks for your reply and arguments regarding refrigerant R134a. As you wrote the R134a is available everywhere and cheap. Many services are able to charge it. But some other specific working fluids for ORC  are available. I would prefer Solkatherm ES 36. This is not available as r134a and it is also much expensive, but it has properties more sufficient for this purpose.

A picture below shows concept of counterflow heatexchanger.
This represents basic design of evaporator and condenser. Also it is designed to simple make it.
http://www.scoop.it/t/organic-rankine-cycle

http://www.scoop.it/t/turbines
Here are some interesting information which I am following about turbines design.

Ammonia is a typical fluid for Kalina cycle. It can work also with ORC but there are more enviromental friendly fluids on  the market.
Most common and ecological refrigerant is R134a. It is used in most car aircondinditioning systems, available and inexpensive.
It has also sufficient thermodynamic properties to use it for this purpose.
Probably the most disadvange is the reguirements for leaking of the system.

See the working pressure and teperature here:
http://www.slideshare.net/MicrogenConcepts/organic-rankine-cycle

I have got more information regarding working temperature and pressure of that ORC.
See link below.

http://www.slideshare.net/MicrogenConcepts/organic-rankine-cycle

Just one prototype was tested an year ago. It reached the working temperature and pressure but the turbine did not achieve sufficient power to spin generator.
It is designed for 65 Watt output power and it is realy needed to design and produce very precise micro turbo expander.

It is designed to convert heat from boiler or thermal solar colectors to mechanical work and generate power.

www.scoop.it/t/organic-rankine-cycle
www.microgenerationconcepts.com/

See picture below
Micro TEX 65W (Micro turbo expander, 65 Watt)

This is my basic micro ORC concept to be developed as DIY project.

www.scoop.it/t/organic-rankine-cycle
www.microgenerationconcepts.com/

ORC converts low temperature heat to mechanical work for generatig elecricity.
The simple ORC consists from 5 basic components: see below.


E-HX - Evaporator heatexchanger
TEX - Turboexpander
G - Generator
C-HX - Condenser heatexchanger
P - Pump