There is a typo on the chiller tag. It should read or rather than nor "Chillers remove heat from a liquid via a vapor compression nor absorption refrigeration cycle."

I am working on a Net Zero Energy project (5 small buildings) with a shared geothermal loop. We Can you create a tag for WSHPs?

Also are you considering adding tags for on-site renewables i.e. solar thermal and solar PV?

Thanks

There is a typo on the chiller tag. It should read or rather than nor

Thanks, looks like it is fixed, just not pushed out yet

an you create a tag for WSHPs? Also are you considering adding tags for on-site renewables i.e. solar thermal and solar PV?

I think we can add whatever tags people thing we need to standardized. But to get the ball rolling, someone has to make a proposal for the new tags and their definitions.

Early draft - something like this?

ASPHP - Air Source Packaged Heat Pump always marked as equip always specified as an HVAC asset ahu and ASPHP packaged

WSPHP - Water Source Packaged Heat Pump always marked as equip always specified as an HVAC asset ahu and WSPHP packaged

ASSHP - Air Source Split Heat Pump always marked as equip always specified as an HVAC asset split

WSSHP - Water Source Split Heat Pump always marked as equip always specified as an HVAC asset split

Yeah just getting a proposal stubbed out is always the first step. As a general philosophy we don't try to use one tag to model everything in one lump sum. So in your case you have a couple different dimensions.

First off you want to model heat pumps which would probably be a tag like heatPump. That gets into question, are heat pumps another classification or marker tag on ahu? That is probably most fundamental decision to get community agreement on.

I don't necessarily understand variations in water source versus air source and packaged versus split, but that seems like two additional dimensions that would each be handled with separate tags.

Packaged units include an AHU and in split systems the AHU is separate.

heatPump

tag DX, WSHP

tag split, package

tag air2air, water2air, water2water

For Solar PV there is a Sunspec Alliance that is developing industry standard solar PV specifications - see http://www.sunspec.org/specifications/.

It seems like it would make sense to normalize the key elements and points between Haystack and Sunspec so that a Sunspec compliant PV system could be discovered by a Haystack app. Does this make sense?

Packaged units include an AHU and in split systems the AHU is separate.

Well others need to chime in, but in general if we decide to make heatPump a special case of ahu, then we need to evaluate which existing points make sense for heat pumps. Or if it doesn't look like there is a good overlap in points, then it might make sense to break into a new equip type. In which case we need a point list that would be common for sensors and commands.

It seems like it would make sense to normalize the key elements and points between Haystack and Sunspec so that a Sunspec compliant PV system could be discovered by a Haystack app. Does this make sense?

Yes definitely. If there is an existing model in a vertical already that has flexible IP terms, we should just reuse it.

Was just told about this project today, and am looking forward to contributing more as time goes on.

With respect to heat pumps - they are a different type of equipment from ahu or ahu and rooftop. wshp would have a boilerPlantRef or chillerPlantRef attached to it - which may be an actual boiler and/or chiller loop but it could also be a ground coupled heat exchanger loop or an open well water loop.

wshp common points would be EWT (entering water temp) LWT (leaving water temp) for both the source loop and the demand loop (in water to water) or EAT or RAT (entering or return air temperature) and LAT or SAT (leaving or supply air temp) for a water to air system.

I could go on but am wondering more about how these decisions to implement something go ahead... How about making suggestions for improvements on existing definitions? Want to make sure the time I can spend here is going to good use...

The systems we have designed have been open loop (well) to HX to closed loop to AHU.