I think so, you need a certain temperature differential, depending on the unit. Harvesting energy from a heat sink is obviously not practical or cost effective. It was just a thought, which I later found to be misguided. Their only real use is for small coolers I guess, meaning like drink coolers, they're called power coolers. For COBs, heat sinks and possibly heat pipes to help, but they're also very costly and probably not even necessary for the wattages commonly used.oh right i forgot about that
i think that cooling the cob proper would be more efficient than trying to harvest heat from the cob which will likely dim it.
also isnt the voltage related to delta T across the peltier? is ambient temp on the cold side enough?
Yeah right, that's probably about it.i think watercooling would be easiest way to harvest usable heat from a cob
and how much is that ?to have the cob to create as little heat as possible
As little current as possible where it still produces light.and how much is that ?
if you drive 10 cobs @ 10% of the typ. current, you have ~ the same heat productionwhere it still produces light
if you drive 10 cobs @ 10% of the typ. current, you have ~ the same heat production
than 1 cob @ 100% typ. current. ~ The difference is more light output.
To run a chip @ 10% current can easily double efficiency eg. 100lm / w ---> 200lm / w
To emit the same amount of light you need only 5 cobs @10% to substitute 1 cob @ 100%.
You will spent only half of the power, but still ~70% of this power will be changed into heat.
maybe off the back but the light they emit will also turn into heat so 100W of either setup in a room will produce the same overall heatThat means all of those 7 cobs produce 66% less heat in total
maybe off the back but the light they emit will also turn into heat so 100W of either setup in a room will produce the same overall heat
well same heat, more usable photons
I think he`s a good man with an golden instinct - like me.He is always wrong.
You wanted to say more lumens, but you said less heat - so the winner is...........Yodaweed.produce 66% less heat in total
at low currents the difference between Tc and Tj are reduced (some datasheets have a Tj-c resistance measurement in deg C/W)Only thing I can think of so far is the transfer resistance between the cob surface and water container not being adequate.
at low currents the difference between Tc and Tj are reduced (some datasheets have a Tj-c resistance measurement in deg C/W)
vero and citi calculators show only 1-3 deg bump in Tj at 25C Tc and 300 mA