@vention4wh I did this once - the propane flame in RV fridges produces a lot of electricity. But I could freeze blocks of ice in my little freezer with a good hot day - and when the sun disappeared, I used the ice blocks to keep the cool coming. It is more efficient to just get a photovoltaic to power a motor which powers a compressor though - until you get into REALLY big systems. This idea would work great for a skyscraper, but for a house, solar is more efficient.
anther way to cool is to have is to drive a compress air engine. then have generator to reduce the loses. The air engine needs to drive something to get maximum cooling effect. I have came up with a simple equations to predict the maximum temperature drop and have video about on my youtube channel
You can find all the current models of portable FPSC freezers here. As well as other FPSC modules and units.
The Coleman model was a re-badged SC-C925.
Went camping this past weekend. Used the Coleman again. I noticed it is starting to look "well used". Still works great, but I'd like to find a back-up just in case.
I do have an older Norcold portable i found at a thrift store, But that unit is quite heavy and uses a bit more juice.
@GREENPOWERSCIENCE G'day... Very interesting. I like to see reversable experiments. Have a look at the 'SunFoil Mk3 Construction' Clip, at the end of it, during the testing ; I was able to "Switch Off" all the Fancy Aerodynamics, with a strand of Rope to generate an Inlet-Stall. The vehicle lost 8% of overall Fuel Efficiency, when tied up ! Try 'Sunfoil Science' to view the Raw Data, and 'S. Short-Talk' to measure your vehicle... Open Source. Retrofit your Car with a PV..!
By "of very efficient design" you mean to say, "Not profitable at this time".
It's such a shame we screw ourselves out of these wonderfully awesome technological advancements. I remember back in the day when my grandfather used to, on the down-low, ahem, modify unleaded gas powered engines and diesel engines to get over 3 times the MPG back in the mid 80's, but you never saw any sort of full fuel system overhaul until over 15 years later, and were still decades behind what we could be!
it's just a magnet with ferro fluid lube reppeling it's self from a smaler magnet fitted in the bottom, of a none ferrus tube with about 190psi of helium in it then an electro magnetic winding is fitted to the bottom at one end and a gate type diod fips the polarity of the coil in the electro-magnet at a high osilation, and poof, same effect with none of the conecting rods in the way.
@GREENPOWERSCIENCE With the free piston stirling cooler as an engine by applying heat, would you not run the risk of demagnetising the magnetic coupling? Some neodymium magnets start to loose gauss at 60℃, which will render the cooler useless.
user myfordboy has a video that shows how to adapt a latex glove to be a low friction diaphragm seal for his simple DIY sterling engine design, made from old tins/MDF, wire, and few misc bits and pieces, easily found in most DIY shops. IMHO all that would be needed to complete the sealing is a 2nd smaller diaphragm seal on the displacer rod. Yes that implementation won't run fast due to lack of balance, but it could be balanced, to allow greater RPM
if you use solar power to run the sterling motor it can pump up to 4 times more heat from the outside of a house to the inside than the sterling need to operate :)
Have you looked into a solar application for an absorption refrigerator to cool your house with in the summer (with no electricity)?
One application is the propane refrigerators in RVs. If you could substitute some of that hot Florida sun for the propane heat source, there's a potential to make yourself into a millionaire.
Thanks for destroying YOUR Stirling engine instead of me destroying mine, a service to the green community. Let these be the LAST Stirling engines destroyed in such empirical endeavours. :)
@joshcryer These engines produce more power [or cool more in reverse] when there's a larger mass of gas inside the engine. Usual solution to keep engine small is to increase gas pressure. problem of keeping gas inside then more difficult. Not difficult to make alpha configuration sterling's using diaphragm seals, but the better gases for sterling's tend to leak through the thin membranes they use. Helium seems to be the best gas, but needs lots of pressure for a decent mass inside engine.
@steveBB30 Thanks, Helium is darn expensive though for experimenting especially if you don't know what you're doing, and half the time will be having to deal with seals, imo. I'm wondering what the efficiency hit would be for an Argon based solution. I think gas-wise Helium is chosen because it has a super low density and compressibility, but I'm not sure if that's why.
@steveBB30 Sorry for the second reply, but it looks like nitrogen would be a better (and cheaper) alternative, even still. I was thinking you *had* to use an inert element (for which argon is the cheapest by far) but for the purpose of refrigeration nitrogen is just as well, though probably not nearly as efficient as helium...
@joshcryer Seem to recall from the bit of thermodynamics I did that a lot of it is down to something called the ratio of specific heats. aka adiabatic index , or gamma. Tends to be higher for the mono-atomic gases. Due to Nitrogen being di-atomic it'll tend towards being 7/5, monoatomic gases tends towards 5/3 . But it does vary with temperature, and seems to drop off with increasing temperature. Indeed at 100 degC Argon seems to offer no improvement over dry air.
@electrodacus you actually move the energy one side from the other, heat/cold are old ways of saying things, when you talk about something being hot its cuss its been powered by something like the sun, or a fire, witch is why all that makes light actually produced heat, cuss its energy, cold if non-existent and heat is a form of energy, witch is what your body lives off of
"heat" needs to be spent or moved ones it hits a molecule, witch is why this work, its "like" a moving car, but not exactly
If he starts from the room temperature then one part will get cold as much as the other part will get hot assuming the same surface area and heat transfer with the outside, then you need to add on the hot side the friction that is converted in to heat.
I'm not really good at explaining things :)
My body need sugar and fat to "burn" most of that is lost to heat (100W to 200W) but I do not need the heat to live off of :)
@vention4wh I did this once - the propane flame in RV fridges produces a lot of electricity. But I could freeze blocks of ice in my little freezer with a good hot day - and when the sun disappeared, I used the ice blocks to keep the cool coming. It is more efficient to just get a photovoltaic to power a motor which powers a compressor though - until you get into REALLY big systems. This idea would work great for a skyscraper, but for a house, solar is more efficient.
dlrion 4 months ago
@dlrion - first sentence not electricity I meant to say heat
dlrion 4 months ago
anther way to cool is to have is to drive a compress air engine. then have generator to reduce the loses. The air engine needs to drive something to get maximum cooling effect. I have came up with a simple equations to predict the maximum temperature drop and have video about on my youtube channel
spark300c 4 months ago
wwwglobalcooling (dot) nl
You can find all the current models of portable FPSC freezers here. As well as other FPSC modules and units.
The Coleman model was a re-badged SC-C925.
Went camping this past weekend. Used the Coleman again. I noticed it is starting to look "well used". Still works great, but I'd like to find a back-up just in case.
I do have an older Norcold portable i found at a thrift store, But that unit is quite heavy and uses a bit more juice.
fireballtp 4 months ago
Put electrical energy in... lose heat energy / cooling?
What are the physics behind this?
BornAgainEngineer 4 months ago
I dont get how it works.
HowToHydroponics 4 months ago
@HowToHydroponics Go to Wikipedia's page for "stirling cycle." Their engine page is good but the stirling cycle page explains it better, I think.
joshcryer 4 months ago
@GREENPOWERSCIENCE G'day... Very interesting. I like to see reversable experiments. Have a look at the 'SunFoil Mk3 Construction' Clip, at the end of it, during the testing ; I was able to "Switch Off" all the Fancy Aerodynamics, with a strand of Rope to generate an Inlet-Stall. The vehicle lost 8% of overall Fuel Efficiency, when tied up ! Try 'Sunfoil Science' to view the Raw Data, and 'S. Short-Talk' to measure your vehicle... Open Source. Retrofit your Car with a PV..!
WarblesOnALot 4 months ago
By "of very efficient design" you mean to say, "Not profitable at this time".
It's such a shame we screw ourselves out of these wonderfully awesome technological advancements. I remember back in the day when my grandfather used to, on the down-low, ahem, modify unleaded gas powered engines and diesel engines to get over 3 times the MPG back in the mid 80's, but you never saw any sort of full fuel system overhaul until over 15 years later, and were still decades behind what we could be!
TronixGuy93 4 months ago
Peltiers are more efficient at this level
kyle170g 4 months ago
it's just a magnet with ferro fluid lube reppeling it's self from a smaler magnet fitted in the bottom, of a none ferrus tube with about 190psi of helium in it then an electro magnetic winding is fitted to the bottom at one end and a gate type diod fips the polarity of the coil in the electro-magnet at a high osilation, and poof, same effect with none of the conecting rods in the way.
FireDropTechnologies 4 months ago
the rombic electornicly
pullsed unit?
FireDropTechnologies 4 months ago
Say Dan?
I bet you can get them to last, the little shit box stirling?
You need some graphite, and to Silicone impregnate the bore.
FireDropTechnologies 4 months ago
@GREENPOWERSCIENCE With the free piston stirling cooler as an engine by applying heat, would you not run the risk of demagnetising the magnetic coupling? Some neodymium magnets start to loose gauss at 60℃, which will render the cooler useless.
locouk 4 months ago
I often thought of the Single pressure absorption refrigeration fridge as a cooler, by focussing the sun onto its heat collector
lezbriddon 4 months ago
user myfordboy has a video that shows how to adapt a latex glove to be a low friction diaphragm seal for his simple DIY sterling engine design, made from old tins/MDF, wire, and few misc bits and pieces, easily found in most DIY shops. IMHO all that would be needed to complete the sealing is a 2nd smaller diaphragm seal on the displacer rod. Yes that implementation won't run fast due to lack of balance, but it could be balanced, to allow greater RPM
steveBB30 4 months ago
if you use solar power to run the sterling motor it can pump up to 4 times more heat from the outside of a house to the inside than the sterling need to operate :)
Nutzername36 4 months ago
one of your nice vids
starlite2991 4 months ago
Ty for using your monies (plural) for buying all the engines :)
entertaining watching this test :D
social3ngin33rin 4 months ago
Have you looked into a solar application for an absorption refrigerator to cool your house with in the summer (with no electricity)?
One application is the propane refrigerators in RVs. If you could substitute some of that hot Florida sun for the propane heat source, there's a potential to make yourself into a millionaire.
vention4wh 4 months ago 14
Thanks for destroying YOUR Stirling engine instead of me destroying mine, a service to the green community. Let these be the LAST Stirling engines destroyed in such empirical endeavours. :)
PsychoticusRex 4 months ago
SIXTH!!!!
dzgfdg 4 months ago
Any idea about using Argon for this? What would the hit be? Any thermochemical engineers here? :)
joshcryer 4 months ago
@joshcryer These engines produce more power [or cool more in reverse] when there's a larger mass of gas inside the engine. Usual solution to keep engine small is to increase gas pressure. problem of keeping gas inside then more difficult. Not difficult to make alpha configuration sterling's using diaphragm seals, but the better gases for sterling's tend to leak through the thin membranes they use. Helium seems to be the best gas, but needs lots of pressure for a decent mass inside engine.
steveBB30 4 months ago
@steveBB30 Thanks, Helium is darn expensive though for experimenting especially if you don't know what you're doing, and half the time will be having to deal with seals, imo. I'm wondering what the efficiency hit would be for an Argon based solution. I think gas-wise Helium is chosen because it has a super low density and compressibility, but I'm not sure if that's why.
joshcryer 4 months ago
@steveBB30 Sorry for the second reply, but it looks like nitrogen would be a better (and cheaper) alternative, even still. I was thinking you *had* to use an inert element (for which argon is the cheapest by far) but for the purpose of refrigeration nitrogen is just as well, though probably not nearly as efficient as helium...
joshcryer 4 months ago
@joshcryer Seem to recall from the bit of thermodynamics I did that a lot of it is down to something called the ratio of specific heats. aka adiabatic index , or gamma. Tends to be higher for the mono-atomic gases. Due to Nitrogen being di-atomic it'll tend towards being 7/5, monoatomic gases tends towards 5/3 . But it does vary with temperature, and seems to drop off with increasing temperature. Indeed at 100 degC Argon seems to offer no improvement over dry air.
steveBB30 4 months ago
Getting it down to freezing is pretty impressive.
Zappyguy111 4 months ago 7
Test
GREENPOWERSCIENCE 4 months ago 11
@GREENPOWERSCIENCE icles lololololOLOLOLOLOL jk...
TotalGameMaster 4 months ago
There is little heat produced most of the heat is pumped from one side to the other
So one part gets cold because you move the heat to the other end.
electrodacus 4 months ago
@electrodacus you actually move the energy one side from the other, heat/cold are old ways of saying things, when you talk about something being hot its cuss its been powered by something like the sun, or a fire, witch is why all that makes light actually produced heat, cuss its energy, cold if non-existent and heat is a form of energy, witch is what your body lives off of
"heat" needs to be spent or moved ones it hits a molecule, witch is why this work, its "like" a moving car, but not exactly
5T34LTHcamoT4NK 4 months ago
@5T34LTHcamoT4NK What he has there is a heat pump.
If he starts from the room temperature then one part will get cold as much as the other part will get hot assuming the same surface area and heat transfer with the outside, then you need to add on the hot side the friction that is converted in to heat.
I'm not really good at explaining things :)
My body need sugar and fat to "burn" most of that is lost to heat (100W to 200W) but I do not need the heat to live off of :)
electrodacus 4 months ago