Compressing steam and water together

  • Thread starter Thread starter pranj5
  • Start date Start date
  • Tags Tags
    Steam Water
AI Thread Summary
The discussion revolves around an imagined experiment involving the adiabatic compression of steam and water in a cylinder. Participants explore how the presence of water keeps the steam saturated, potentially reducing power consumption during compression compared to superheated steam. They debate the effects of varying amounts of liquid water on the work required for compression, emphasizing that an optimal water level is necessary to minimize energy use. The conversation also touches on the differences between internal energy and enthalpy in the context of this process. Ultimately, the participants aim to calculate the work done during this adiabatic compression scenario.
  • #101
Mech_Engineer said:
I think its time you calculate the alleged savings before making any more claims. Use a steam chart of your choosing, maybe the h-s chart we were looking at before.
As per this http://www.criticalprocesses.com/Use%20of%20enthalpies%20to%20calculate%20energy%20needed.htm, it will take around 135.1 kJ/kg to compress steam from 2.536 kPa to 1 bar (20C saturation level to 100C saturation). And if the machine is 70% efficient, then the gross power consumption would be 193 kW for producing 1 kg/sec steam flow. And, that means the gross enthalpy stored in steam at 100C is around 2674.95 kW. Now, if we consider that the electricity comes from a 33% efficient plant, that means 193 kW of electricity equals to 579 kW of heat. If we subtract that from 2674.95, that equals to 2095.95 kW of heat. Not a bad amount at all.
All the data i have from this site.
Chestermiller said:
You seem so very confident about all this. And, since you are so confident, what was your reason for starting this thread in the first place?
Simple. I just want to be more confident and want to see how much correct I am. After all, we all are human and anybody can make mistakes.
 
Last edited:
Engineering news on Phys.org
  • #102
I have a question at this point, I have two books by Babcock and Wilcock (?) titled "Steam", in one they mention that super heated steam that receives heat above the super heated point, will deliver 100% of that added heat at the point of use, but that line of thermodynamics is beyond the scope of this writing. Is this the realm that is the object of this thread pranj5 ?
These are old books and if this is an already known area, why is it not in practice already ? I dismissed it as requiring equipment that exceeds practical standards, when I was trying to make that special power for a Tesla Turbine.
I have been interested in this thread and the extraordinary patients of Chestermiller (Thanks) but it's certainly well over my head. :smile:
 
  • #103
pranj5 said:
...that equals to 2095.95 kW of heat. Not a bad amount at all.

What would that heat then be used for?
 

Similar threads

Replies
60
Views
14K
Replies
16
Views
3K
Replies
11
Views
4K
Replies
8
Views
2K
Replies
35
Views
4K
Replies
45
Views
5K
Back
Top