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Akkumulatorer er termoelektriske og skal op på taget?
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Glenn
May 22, 2014, 1:34:19 AM5/22/14
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En varmetolerant akkumulator kan anvendes som "termoelektrisk generator".
Plac�r akkumulatorer p� solcellepanel/solvarmepanel bagsider, s� de fx
er 50-60�C om dagen, mens de lades.
Om natten hvor akkumulatorene fx er 10�C kan ca. 5-6% mere energi hentes
ud, if�lge efterf�lgende artikel.
Har de mon t�nk p�, at der er mindre energi at hente ud ved lavere
temperaturer fx 0..10�C?
De m�ske bedst egnede akkumulatorer er nok A123Systems LiFePO4
akkumulatorer, da de har lang levetid ved 60�C:
Massachusetts Institute of Technology. (2014, May 21). A new way to
harness waste heat: Electrochemical approach has potential to
efficiently turn low-grade heat to electricity. ScienceDaily:
http://www.sciencedaily.com/releases/2014/05/140521133611.htm
Citat: "...
Since the voltage of rechargeable batteries depends on temperature, the
new system combines the charging-discharging cycles of these batteries
with heating and cooling, so that the discharge voltage is higher than
charge voltage. The system can efficiently harness even relatively small
temperature differences, such as a 50 degrees Celsius difference.
...
To begin, the uncharged battery is heated by the waste heat. Then, while
at the higher temperature, the battery is charged; once fully charged,
it is allowed to cool. Because the charging voltage is lower at high
temperatures than at low temperatures, once it has cooled the battery
can actually deliver more electricity than what was used to charge it.
That extra energy, of course, doesn't just appear from nowhere: It comes
from the heat that was added to the system.
The system aims at harvesting heat of less than 100 degrees Celsius,
which accounts for a large proportion of potentially harvestable waste
heat. In a demonstration with waste heat of 60 degrees Celsius the new
system has an estimated efficiency of 5.7 percent.
..."
/Glenn
Plac�r akkumulatorer p� solcellepanel/solvarmepanel bagsider, s� de fx
er 50-60�C om dagen, mens de lades.
Om natten hvor akkumulatorene fx er 10�C kan ca. 5-6% mere energi hentes
ud, if�lge efterf�lgende artikel.
Har de mon t�nk p�, at der er mindre energi at hente ud ved lavere
temperaturer fx 0..10�C?
De m�ske bedst egnede akkumulatorer er nok A123Systems LiFePO4
akkumulatorer, da de har lang levetid ved 60�C:
Massachusetts Institute of Technology. (2014, May 21). A new way to
harness waste heat: Electrochemical approach has potential to
efficiently turn low-grade heat to electricity. ScienceDaily:
http://www.sciencedaily.com/releases/2014/05/140521133611.htm
Citat: "...
Since the voltage of rechargeable batteries depends on temperature, the
new system combines the charging-discharging cycles of these batteries
with heating and cooling, so that the discharge voltage is higher than
charge voltage. The system can efficiently harness even relatively small
temperature differences, such as a 50 degrees Celsius difference.
...
To begin, the uncharged battery is heated by the waste heat. Then, while
at the higher temperature, the battery is charged; once fully charged,
it is allowed to cool. Because the charging voltage is lower at high
temperatures than at low temperatures, once it has cooled the battery
can actually deliver more electricity than what was used to charge it.
That extra energy, of course, doesn't just appear from nowhere: It comes
from the heat that was added to the system.
The system aims at harvesting heat of less than 100 degrees Celsius,
which accounts for a large proportion of potentially harvestable waste
heat. In a demonstration with waste heat of 60 degrees Celsius the new
system has an estimated efficiency of 5.7 percent.
..."
/Glenn
CC
May 22, 2014, 7:14:00 AM5/22/14
to
opn� det estimeret effektivitet.
Vil hellere anbefale, at monterer gulvarme-fordelingsplader til tr�gulve
p� bagside af solpanelerne. Monterer pex-slanger som sl�jfer, og saml
det i en manifold. Hovedslangen fra manifolden "k�res" over i "sv�mmep�len".
Det giver 2 fordele.
1. Solpanelet k�les ned, hermed stiger el produktionen af solpanelet.
2. Massere af gratis varme i "p�len", der forl�nger bades�sonen.
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