Re: [Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-10 Thread Jürg Wyttenbach
OK If you change the limits like some do with the Peltier elements using 500C input then you can get higher COP's due to the higher entry level. (and just ignore the heating of the input...) Heat pumps we use in houses are certified - Europe for 0..35C, not for 10..35C - as we live pretty

Re: [Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-10 Thread Jonathan Berry
*Sorry a heatpump (HP) cannot have a COP 30 or 60* Sorry but they can, I gave you the links. The math also supports this. No, you are right that a regular small house-hold heatpumps operating at 100% power over the rated temperature differential will top out currently at about a heating COP of

Re: [Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-10 Thread Jürg Wyttenbach
Sorry a heatpump (HP) cannot have a COP 30 or 60. Assume a COP of 5 for a single step HP as we have it today in a reasonably good probe heat pump. (mine has 5.5 for heating) You can neither simply multiply or add the COP's as you must provide e.g. 20x the basic energy to fill the reservoir

Re: [Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-09 Thread Jonathan Berry
Oh I missed the end: "Heatpumps are reverse Carnot engines and have a much higher COP in respect to heat gained but *not to current gained!!!"* Current? I'm not sure what you mean by this, you might be talking about the volume of thermal energy moved, or you might be talking about the

Re: [Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-09 Thread Jonathan Berry
Not sure why but this isn't forming into proper paragraphs... *"Youtube physics usually is self satisfaction of people that have no clue of the simplest things. So I almost never watch this garbage."* The video is covering the work of a company cascading heat pumps. As such the temperature

Re: [Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-09 Thread Jürg Wyttenbach
Youtube physics usually is self satisfaction of people that have no clue of the simplest things. So I almost never watch this garbage. A heatpump is not a Carnot process as *you obviously supply additional energy*! You must calculate in the Carnot conversion rate of energy gained -->

[Vo]:If 2 heat engines are placed in series their efficiency is lower, and the second law breaks according to Carnot if that can occur!

2024-05-09 Thread Jonathan Berry
After 200 years (1824) the second law of thermodynamics is disproven. https://en.wikipedia.org/wiki/Carnot%27s_theorem_(thermodynamics) Simply Carnot argues that if the efficiency of a reversible heat engine was variable based on how it is made or the gases etc, then the second law of