Reverse Refrigeration Cycle (Organic Rankine)

Here is a few compiled clips of a senior design project I worked on that converted waste heat energy at 190 degrees to motive power at an estimated 30% efficiency.

Category:

Howto & Style

Tags:

• rankine
• energy
• refrigeration
• turbine
• condenser

[skittlesmonkey]

why is it that the Rankine Cycle is run with a liquid that has such a high heat of vaporization wouldn't u want to generate as much gas with as little heat as possible?

[skreennaim02]

R-123 was chosen as the refrigerant due to its low condensation temperature, which allowed the refrigerant to be transferred in liquid form at room temperature. High heat of vaporization is actually preferable here, as it reduces the required flow rate to extract the same amount of work from the heat source.

[tsport100]

How are you 'estimating' the efficiency without generating any power off the output shaft?

That's a vane type pump, some companies offer turboexpanders that run at cryo temps in the low Kw range.

[skreennaim02]

The air motor comes with a chart that gives an estimate of the output power based on RPM of the shaft and pressure differential across the pump. RPM was measured using a stroboscope, pressure difference was measured using gauges seen in video (one on each side of the air motor).

[skreennaim02]

Correction to above: "pressure differential across the air motor"

[jbl300]

Hi.How can you get more pressure(250PSI),maybe with a bigger heat exchanger and let the pump running longer?R134?Thank you!

[jbl300]

Can you tell me please what brand is the feed pump?Thanks!

[jbl300]

Hi.If you change the air motor with a expansion valve and a evaporator it will be an air conditioner?It will work?Thank you!

[skittlesmonkey]

i have read that high heat of vaporization is desirable but i don't understand why? why does it matter that the energy it took to make that gas is higher or lower when its rushing past a turbine and than being compressed.

[skittlesmonkey]

wait isn't flow rate the thing that gives u energy? wouldn't u want as much gas as possible per unit heat energy to put more spin on the motor? if with 23 kj of heat energy i can make 22.4 liters of ammonia vapor or something like 30 liters of propane vapor and let them run past a pneumatic motor y would i choose the ammonia if i get more gas to utilize with the propane?

[tsport100]

Yes they can... BMW are working on rankin cycle and thermocouples and new Hybrid rules at Le Mans for 2010 allow Organic Ranking energy recovery systems.

[Membrane556]

I wonder if something like this could recover waste heat from vehicle engines.

[terry1919]

so are you saying that if this system is part of a Nuclear generating plant you could extract more energy to use to drive another electric generator as well as a steam turbine????