Yes, no heat exchanger can transfer 100% which is why heat is added just before the condenser. Otherwise the cycle would stop due to temperature degradation.
In a traditional process most, if not all, the latent heat would be lost to the atmosphere / cooling fluid. This process attempts to...
SwinnyGG (Mechanical), et al,
I found the discourse very helpful and I did get real feedback that is very useful. I actually appreciated every bit of it.
Thank you, everyone.
If I was someone who didn't understand the laws of thermodynamics, it would be laughable. I understand there is a finite amount of energy in the universe and it moves from high quality / ordered energy to lower quality, dissipated energy-entropy. I do understand that you cannot get more energy...
Both of you are much more knowledgeable of steam power plant cycles than I. I appreciate and respect your comments and guidance. But, I will point out a flaw in your belief that the cold reservoir of a heat engine cannot be the heat engine itself. That notion does not make thermodynamic sense...
Here's an example of latent heat reuse from a cycle to heat the working fluid of the same cycle:
The Principle Behind the Regenerative Rankine Cycle
Relatively more specific, the Regenerative Rankine Cycle deviates from a simple Rankine Cycle by using feedwater heaters. These heaters recover...
Really?? Think about it. Think about it long and hard.
Your claim is that heat knows where it came from. Hypothetically, let's say 1 kg of steam at 1000C is condensed to create 1 liter of condensate at ~95C. The heat released from the condensation process is 1996 x 900 = 1,796 kJ + 2,256...
No, it's not perpetual motion. It's heat being added from a hot source to a cooler source.
I guess you didn't read my other comment about condensate reuse.
Condensate reuse is when steam from the cycle is condensed and the hot water (which, by the way, contains heat from the original cycle)...
My intention is to increase the efficiency of steam power cycles by rethinking how they're done. Efficiency improvements of 10%, 20% would be great and products can be created to accomplish these improvements.
Creating more power from less power violates the second law of thermodynamics and is...
Any prospective employee worth their salt will likely see the following as red flags:
- A power cycle with an expansion valve immediately after a pump
Geothermal power plants use the natural pressure of geothermal steam to force hot water through an expansion valve. Natural pressure or a pump...
When water becomes vapor, it won't condense unless it comes in contact with a surface that is cooler than the vapor itself. The Venturi creates a zone of low pressure at the throat, this is where the water changes phase. Studies have shown that the length of the throat does not affect the...
The pump does add energy to the water which increases it's velocity through the Venturi. This reduces the pressure of the water to below its saturated vapor pressure. This drop in pressure imposes a metastable state that directs the sensible heat to latent heat. If the velocity of the water is...
3DDave,
Not sure I follow, but I think you're saying the force is reduced by the phase change from water into steam. Liquid water, in this case, is more effective at providing kinetic energy to the turbine.
Shouldn't the thrust of the steam be greater than the liquid - up to 1600 times more...
The pressures are absolute. The condensate expands in an adiabatic process as the pressure is reduced and reaches 0 Pa. The process occurs in 200 μs. My goal was to represent this expansion from liquid @ .001 m^3 to vapor @1.24 m^3 (state point 2) then further expand to 1.69 m^3 as it is heated...
3DDave,
Thank you for the suggestion. I put flow direction arrows on the PFD. I also added the liquid flow rate and the velocity of the vapor upon exit of the Venturi. The flow rate of the water is 1 liter per second with a velocity of 24 m/s through the throat of the Venturi. The diameter of...
Here are a new PFD and PV Diagram with state points labeled. I increased the temperature and only have heat being added at the turbine. The isobaric portion has heat added at the turbine. Additional heat is added at 4 and should not add to work, but I've left it for this exercise. I'm trying to...
I didn't overwrite any values. The spreadsheet I used displayed the values in a chart as it is shown instead of closing the loop.
Your PV Plot doesn't even reflect the largest expansion from .001 to 1.249. Even if I calculate the amount of work from the constant pressure of 101.325 kPa and a...
Taking the piss, Lol. I don't know if I am yet, either. Yes, the thermodynamic cycle on a PV plot should be a closed shape. You'll notice the final volume, farthest to the right .001, is also the starting volume, which means it's a cyclic loop and would be a closed shape. I wasn't able to get my...
3DDave,
I think you are right. If the heat is just exhausted as waste it hasn't done any work. I don't know at this point how much of the heat will be transferred to the steam as temperature or as work. I do know that when you heat a gas, it expands and when a gas expands in a boundary layer...
When I posted the links to the papers, I mentioned:
"I tried to stick to studies of flash occurring "in nozzle" rather than flash occurring upon nozzle exit into a low pressure chamber."
One of the papers mentions exit into a flash chamber, the others do not. Keep in mind the zone of 0...
