you have to chop it and step it up. The voltage is way too low with thermocouples to do anything else.
Will Rogers quote: "Stupidity got us into this – why can't it get us out?"
From: Kevin Pemberton <pembertonkevin@gmail.com>
To: electricboats@yahoogroups.com
Sent: Saturday, September 22, 2012 9:48 PM
Subject: Re: [Electric Boats] Re: electricity from heat
Not exactly but yes. Solid state stuff works better at lower temps, that
makes them work better than thermocouples in the solar heat range.
Voltages are increased in the same fashion as a battery works, many
cells in series. The diodes used are stacked for series for voltage
output, parallel for heat transfer. It simply would not prove
advantageous to use a DC to DC converter to increase voltage in this
application.
Kevin Pemberton
On 09/22/2012 10:15 AM, Kirk McLoren wrote:
> Before the solid state stuff thermopiles were made with dissimilar metals, thermocouples. They make very small voltages, millivolts.
> I never persued it but my immediate impression was the thermocouples need to be rebar not wire to get their resistance down. Millivolts get eaten quickly by milliohms. The advantages of thermocouples is higher operating temperature and since they are just metal they are nearly indestructible..
> An inverter would be used to step up the voltage using very low resistance FETs
makes them work better than thermocouples in the solar heat range.
Voltages are increased in the same fashion as a battery works, many
cells in series. The diodes used are stacked for series for voltage
output, parallel for heat transfer. It simply would not prove
advantageous to use a DC to DC converter to increase voltage in this
application.
Kevin Pemberton
On 09/22/2012 10:15 AM, Kirk McLoren wrote:
> Before the solid state stuff thermopiles were made with dissimilar metals, thermocouples. They make very small voltages, millivolts.
> I never persued it but my immediate impression was the thermocouples need to be rebar not wire to get their resistance down. Millivolts get eaten quickly by milliohms. The advantages of thermocouples is higher operating temperature and since they are just metal they are nearly indestructible..
> An inverter would be used to step up the voltage using very low resistance FETs
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