Thermal Lag Engine for more cheap energy than the Rhombic Stirling to go off grid
ฝัง
- เผยแพร่เมื่อ 2 พ.ค. 2024
- In this video I show you the beginning of the investigation into which Stirling engine concept could become the successor to the Rhombic Stirling.
The Stirling engines I have built are too complex for energy self-sufficiency and therefore too expensive and maintenance-intensive.
I would now like to extensively investigate which engine concept would be best for my next project.
The Thermal Lag Engine represents a mechanical simplification of common Stirling engines.
It uses only a single piston which avoids a complex linkage mechanism.
The piston is also located in a cooled volume which makes sealing much more easy and increases endurance properties.
The Thermal Lag Engine is still a relatively new invention which has not been researched much and offers a lot of potential for improvement.
The Thermal Lag Engine was patented in 1995 by Peter Tailer.
It consists of a hot space where the heat is supplied to power the engine and a cooled cylinder in which the piston moves.
The single piston in the cooled part of the engine simplifies sealing and endurance characteristics.
The simple linkage mechanism causes little friction and can be built very small, which simplifies any pressure charging.
The hot heat exchanger typically has a much smaller diameter than the cooler and is therefore much cheaper and easier to build.
In contrast Thermal Lag Engines are still in the research and development phase and have not yet been applied in practice.
There are only a small number of studies relevant to the TLE reported.
Fundamental knowledge investigation of the TLE is lacking and the physical understanding is insufficient.
Colin D. West and Peter Tailer claim that the main effect of the TLE is the bulk motion of the fluid from the hot to the cold space and back which leads to the heat transfer that drives the engine.
Allan Organ explained the engine from a completely different perspective.
He identified the connecting space between the hot and cold spaces of the TLE as a pulse tube.
Further analysis revealed that both theories are not explicitly contradictory, but represent different implementations of the same effect.
To improve engine performance, the driving phenomena needs to be fully understood.
Numerical models have shown that the P-V diagram is much narrower than that of a traditional Stirling engine.
The TLE thus has a relatively poor efficiency and thermodynamic performance.
To increase the efficiency the design of the engine based on fundamental knowledge and physical insight becomes more essential.
Different approaches such as the analytical method, the thermodynamic model, CFD (Computational Fluid Dynamics) and even a neural network and generic algorithm were used to calculate optimal performance and efficiency.
Nevertheless, the most powerful experimental TLEs known to me only have a maximum output of 25-45 watts.
The complex interrelationships of the operating principle do not make the design easy.
In addition, the design of the heat exchangers is not conducive to intuitive development, making experimental optimization difficult.
There is still a lot of room for performance improvements here, but the still very unexplored optimization methods make a promising development difficult.
The TLE offers many simplifications and advantages but for me the potential for a self-build is difficult to assess and therefore I don't think the TLE would be a good choice.
What do you think about the Thermal Lag Engine, please let me know and write it in the comments!
Thank you very much for your attention.
Thank you so much for the TLE artwork from my wonderful daughter Anna
Thanks for the background music:
Song: Jim Yosef - Eclipse [NCS Release]
Music provided by NoCopyrightSounds
Free Download/Stream: ncs.io/eclispe Watch: • Jim Yosef - Eclipse | House | NCS
The NASA RPC Stirling engine has been running continuously for 18 years and is showing no signs of wear, You have the complicated parts already machined from your last engine, you could reuse them with slight modifications, the addition of flat spring stacks and a linear generator made however you see fit. The wear and difficulty sealing on the piston parts of your machine largely comes from the fact that the crank causes a side load on the piston, with the design with no crank its much easier to get a low friction seal, it is also much easier to get the very high working pressure that you absolutely need for both power and efficiency when the whole engine can be sealed with no rotary shafts. If you google this you could find a diagram that could be used to make a copy which would perform well and is tried and tested. The piston seals are very important, you could try some "carbon graphite reinforced PTFE" ;-)
@While: 要求±10ppm 频飘太厉害会导致WiFi出问题，[泪奔]或者搬乐鑫模组的晶振和负载电容
add a heat exchange refrigeration cycle to a normal steam piston engine
I think your design and experience on the alpha configuration is excellent some minor tweaks and you will succeed.
Cold side looks easy to 3d print. Shall we make some?
Really interesting channel! Just subscribed! I'm mainly commenting, so the algorithm recommends your videos to people like me :) But while I'm here, i've got a couple questions if you don't mind:
1. Route compression stroke via external tubing/piping to top of hot tube ?
This is a fascinating subject. Great videos!
I like the simplicity and the fact that there isn't many resources out there on it, I think that it would be a useful engine to build and experiment on, because even if you fail to produce a powerful engine, you will add data to the world about this engine.
The problem with all these low energy engine is basic thermodynamics.
I remember research on a gold palladium alloy as a seal/bearing material. It was somehow generating graphene from compression and local carbon sources and self lining itself with it.
So a TLE is the reverse of a pulse tube cryocooler perhaps?
Well that's your choice bias, any tech has its development or derangement as petrol contamination and excess, you forgot solar thermal vortex chimeis and solar steam that can cook, desalinate water and move any mechanical tool or appliance
Glad you did it !!!!!!!! gg
I don't think much of the type of engine you described and, in my opinion, falls into the performance group of fluid Stirling engines. I have a book on the latter type and in my opinion it is severely limited in performance such as Watts/cc displacement.
Interesting if your goal is experimentation. But not for a practical application.
Off settings the drive piston from center, the way that is done on cars, might be useful.
Hey there! Great videos. As someone lacking tools to build those engines, I have to enjoy them vicariously through guys like you.
This is a cool video and channel! Congratulate! What do you think about a thermoacoustic engine with displacer for the heat changing and cheap turbine generator?
Ok I found the link but it doesn't work can u please repost the links and files