Temp Posted February 16, 2022 Share Posted February 16, 2022 (edited) Sound waves are essentially variations in pressure and that's what a heat pump does, it varies the pressure to make the gas either abrorb or emit heat. So no surprise someone has built a heat pump that uses sound waves... https://www.connexionfrance.com/Practical/Science-and-Technology/New-French-invented-green-heat-pump-warms-homes-with-sound-waves Highlights... "A new system developed by Cédric François replaces the compressor with a small unit with a patented sound generator at its core, sending out a noise in the 100Hz to 150Hz range.." "...there are no moving parts, so the expected life of the core will go up from the present 10 years to 30, at least...." Edited February 16, 2022 by Temp 1 Link to comment Share on other sites More sharing options...
dpmiller Posted February 16, 2022 Share Posted February 16, 2022 It definitely has a moving part, and... how can the COP be greater than 1? Link to comment Share on other sites More sharing options...
Bonner Posted February 16, 2022 Share Posted February 16, 2022 Sound is a wave or oscillation, not an accumulation of pressure. So yes, gas is pressurised during half of the wave and it’s temperature will increase as a result ... but then pressure goes negative which will causing equal cooling. Both heating and cooling effects are infinitesimally small and reversed 100-150 times per second. Not sure how the positive pressure can be ‘focused’ to accumulate sufficient useful energy. Link to comment Share on other sites More sharing options...
JohnMo Posted February 16, 2022 Share Posted February 16, 2022 Not sure it works anything like a conventional fridge/heat pump compressor. From their website Acoustic waves are generated and amplified automatically in our machines by temperature gradient or by electricity. They do a compression-expansion work in the manner of a piston in a thermal engine or in a compression machine used to produce heat or cold, which makes it possible to carry out ultra-efficient heat pumping, without moving parts and without greenhouse gas refrigerant. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 16, 2022 Share Posted February 16, 2022 Does it work like a pulsejet engine. Still relied on the Carnot cycle. Ultra sound cleaning caused a change of state in the cleaning fluid on the surface of article being cleaned. That is a form of focusing. Seem to remember reading about this 20 plus years ago, surprised it has taken this long to get this far. Not sure where all the helium will come from, it is a fairly rare gas these days, and we are not making anymore if it on Earth. Link to comment Share on other sites More sharing options...
Radian Posted February 16, 2022 Share Posted February 16, 2022 4 hours ago, Bonner said: So yes, gas is pressurised during half of the wave and it’s temperature will increase as a result ... but then pressure goes negative which will causing equal cooling. Pretty sure it's a development of the Thermoacoustic Heat Engine Quote The most efficient thermoacoustic devices have an efficiency approaching 40% of the Carnot limit, or about 20% to 30% overall Link to comment Share on other sites More sharing options...
SteamyTea Posted February 16, 2022 Share Posted February 16, 2022 6 minutes ago, Radian said: Pretty sure it's a development of the Thermoacoustic Heat Engine The efficiency is only for the compression part of a heat pump, it does not take into account the energy it scavenges from the heat source i.e. the air or water. Be interesting to know what the best scroll and piston pumps efficiency is. Link to comment Share on other sites More sharing options...
Marvin Posted February 16, 2022 Share Posted February 16, 2022 (edited) 2 hours ago, SteamyTea said: Not sure where all the helium will come from, it is a fairly rare gas these days, and we are not making anymore if it on Earth. There I think is the catch. Didn't think you could make helium.... Edited February 16, 2022 by Marvin Add info Link to comment Share on other sites More sharing options...
SteamyTea Posted February 16, 2022 Share Posted February 16, 2022 (edited) 20 minutes ago, Marvin said: There I think is the catch. Didn't think you could make helium.... They could run it on CO2 which is a pretty good refrigerant gas, but generally only when it is in a critical state around 31°C, but if this pressure pump can increase that 30 atmospheres, then it is around 73°C, which is useful. We do make helium, in a fusion reactor, how they work. Not sure how much you get in 5 seconds though. Edited February 16, 2022 by SteamyTea 2 Link to comment Share on other sites More sharing options...
Radian Posted February 16, 2022 Share Posted February 16, 2022 Get Elon to drill for it on the moon. 100~150Hz. Damn that'll be annoying. Link to comment Share on other sites More sharing options...
SteamyTea Posted February 16, 2022 Share Posted February 16, 2022 1 hour ago, Radian said: Get Elon to drill for it on the moon. Too late, the Chinese did it on Space Force. Link to comment Share on other sites More sharing options...
Temp Posted February 16, 2022 Author Share Posted February 16, 2022 Not a lot more on their website.. https://www.equium.fr/en/home#La-Thermoacoustique They claim.. "A SCOP (Seasonal Coefficient of Performance) higher than traditional High Temperature heat pumps." Link to comment Share on other sites More sharing options...
SteamyTea Posted February 16, 2022 Share Posted February 16, 2022 1 minute ago, Temp said: They claim.. "A SCOP (Seasonal Coefficient of Performance) higher than traditional High Temperature heat pumps." So no comparison with normal HPs then. Link to comment Share on other sites More sharing options...
Temp Posted February 16, 2022 Author Share Posted February 16, 2022 https://www.s2e2.fr/en/adherents/equium-2-en/ EQUIUM was launched in 2017 to industrialise and take to market the thermoacoustic technology developed for over 12 years by affiliate company Hekyom R&D. Hekyom R&D was created in 2002 by Maurice FRANÇOIS, PhD in Electronic Physics & Mechanical Engineering, now retired professor emeritus at Paris VI University, who has been at the forefront of research in thermoacoustics since 1995. In 2018 both firms merged. The result is a highly patented technology, with 10 patents (owned & pending) owned by EQUIUM and unique know-how. In 2018 EQUIUM, developed a prototype producing 2 kW cold at 5°C from at high temperatures (300°C) and is now scaling a new preindustrial prototype producing 15kW cold at 5°C from 30 kW 220°C EQUIUM has received multiple awards, including from BPI iLab 2017, startwest 2019 and crisalide eco activité 2019. EQUIUM's R&D effort has been backed for 8 years by ADEME, the French Energy Efficiency Agency. Link to comment Share on other sites More sharing options...
Temp Posted February 16, 2022 Author Share Posted February 16, 2022 Just now, SteamyTea said: So no comparison with normal HPs then. No figures at all that I could see. Link to comment Share on other sites More sharing options...
Radian Posted February 16, 2022 Share Posted February 16, 2022 Quote In 2018 EQUIUM, developed a prototype producing 2 kW cold at 5°C from at high temperatures (300°C) I can't parse that at all. 2000 Joule/seconds? Some energy was involved for some time. Maybe it was 1/1000th of a Joule collected over three weeks or so. Link to comment Share on other sites More sharing options...
Temp Posted February 16, 2022 Author Share Posted February 16, 2022 (edited) 13 minutes ago, Radian said: I can't parse that at all. 2000 Joule/seconds? Some energy was involved for some time. Maybe it was 1/1000th of a Joule collected over three weeks or so. Google suggests that in the past the original idea for their tech was for cooling. Possibly using engine exhaust heat to drive an AC unit? Perhaps for cars? So they are saying their system could remove 2 kW from air reducing it to 5C using energy from a 300C heat source? Something like that. Edited February 16, 2022 by Temp Link to comment Share on other sites More sharing options...
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