On: Ask HN: Any hardware startups here?

[Ndymium]

Quoting from their linked website:

> Our heat pump can generate up to 3 times as much heat as a resistor, using the same amount of electricity.

Though it doesn't mention the temperature at which this is achieved, only that the range is from 160 to 550°C.

[franckl → Ndymium]

we published a calculator if you would like to dig deeper! https://airthium.github.io/airthium.com-calculator/

The COP gets lower as the temperature difference increases as you can expect.

[jbm → franckl]

For those, like me, who didn't know this term:

https://en.wikipedia.org/wiki/Coefficient_of_performance

> The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required.[1][2] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.

[inamberclad → Ndymium]

That 'up to 3 times' is a very generic sounding Carnot cycle number. It's about the upper limit for heat pump performance, so it's not a very meaningful number IMO.