Thema "Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?" in The Viessmann API

Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

AnHardt — Mon, 16 Jan 2023 22:17:02 GMT

Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

I'd expect a 'volume/time'.

Or if 'liters' is correct. What does the number mean?

Betreff: Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

live — Wed, 18 Jan 2023 18:31:23 GMT

A liter is a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1, 000 cubic centimeters (or approximately 1.75 pints)

definition form wolfram alpha

Betreff: Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

AnHardt — Fri, 20 Jan 2023 00:42:42 GMT

Thanks for a very good definition of liter.

But the question was more about how a flow can be expressed in liters only.

With a difference of temperatures and a flow (and the specific thermal capacity of the transported material) i could estimate the transported energy. But to do that one needs to now in what time this liters are flowing thru the system. Is it 200 liters per second or per year. The time component of a flow is as important as the volume.

Volumetric Flow Rate (Wikipedia en)

Volumenstrom (Wikipedia de)

So either liters is not a correct unit for 'heating.sensors.volumetricFlow.allengra'

or i completely misunderstand what 'heating.sensors.volumetricFlow.allengra' could mean.

Betreff: Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

live — Fri, 20 Jan 2023 08:23:17 GMT

Ok, so I didn#t get you question right. Can't check currently, but so fare I remember the unit was liter/h.

Re: Betreff: Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

CustomerCareMichael — Fri, 20 Jan 2023 08:25:39 GMT

Hi @AnHardt,

Thanks for the question. In the heating domain, generally the unit "per hour" is used for these values. As this is mostly clear for installers and partner, the time is often left out.

So, the correct unit in this case is "liter/hour".

Regards,

Michael

Re: Betreff: Why has "heating.sensors.volumetricFlow.allengra" a unit of "liters"?

AnHardt — Sat, 21 Jan 2023 23:42:31 GMT

Thanks.

But take it as an error report.