IET
Decrease font size
Increase font size
Topic Title: Will It Ever Be Realistically Possible to Wire Buildings with
Topic Summary: SUPERCONDUCTORS?
Created On: 18 March 2019 09:21 am
Status: Read Only
Linear : Threading : Single : Branch
Search Topic Search Topic
Topic Tools Topic Tools
View similar topics View similar topics
View topic in raw text format. Print this topic.
 18 March 2019 09:21 am
User is offline View Users Profile Print this message



Zoomup

Posts: 6117
Joined: 20 February 2014

 18 March 2019 09:53 am
User is offline View Users Profile Print this message



broadgage

Posts: 3170
Joined: 07 August 2007

To me it seems most unlikely that room temperature super conductors will ever be developed, and since building wiring has to operate at room temperature or thereabouts, it therefore seems unlikely that we will ever see this.

It is of course possible that some unexpected advance will result in the availability of room temperature superconductors, but not in my view likely.

Copper wire is cheap and easy to install, and the average energy lost therein is typically one or two percent within a building.
So any putative superconductor with zero losses will have to be nearly as cheap as copper if it is to be worth using.
 18 March 2019 01:27 pm
User is offline View Users Profile Print this message



mapj1

Posts: 12039
Joined: 22 July 2004

Almost certainly not, all supeconductors have a critical internal magnetic field level, that translates to a critical current density, that if exceeded breaks the long range order betwen the electrons, switching it back to being normal metal or insulator. In general the higher the critical temperature, the lower the maximum possible current density.

There may however be applications for fuses.

Certainly the current generation of easily formed higher temp superconductors are complex oxides and are ceramic like in their mechanical behaviour, and easily shattered.
Curently the hottest record is for hydorgen sulphide - 'bad egg gas' which when crushed to form a solid at ~ 100GPa (that is a million atmospheres or so pressure) does become superconducting below -70C, though this is not an oxide, it is no more convenient, and the pressure is likely to be a show stopper for many applications, still, at least you'd smell a small leak ! A large one would be deadly.

As already noted the losses in house wiring are a very small fraction of the total (say less than 5% given the permissable voltage drop in private installation.) It is not likely to ever be worth it.

-------------------------
regards Mike
 18 March 2019 10:39 pm
User is offline View Users Profile Print this message



potential

Posts: 1774
Joined: 01 February 2007

Why would you want to wire a house with superconductors?
I'd hate to think what a dead short would be like.
 19 March 2019 05:59 am
User is offline View Users Profile Print this message



mapj1

Posts: 12039
Joined: 22 July 2004

In the lab at least, inductance is the bigger problem, not PSSC- as soon as the current rises to the critical level, the material snaps back to being normal.
In large superconducting coils it is essential to make provision for the dissipation of all the stored I squared L energy if the current is suddenly interrupted. The other problem is if it warms up, as then as it ceases to be superconducting if the process is patchy it will heat up in the normal regions, boiling off the coolant.
- there have been some impressive over pressure accidents over the years by mis-switching.

even a deliberate switch off can be quite impressive
This is an old hospital scanner being decommissioned in the states to become a training aid.

-------------------------
regards Mike


Edited: 19 March 2019 at 06:07 am by mapj1
Statistics

New here?

  • To participate in discussions, please log in and introduce yourself.

See Also:



FuseTalk Standard Edition v3.2 - © 1999-2021 FuseTalk Inc. All rights reserved.

 
..