We currently have a list of points for certain types of equips like, VAV or AHU. But we don't have a list of points for all of our meters. Can someone in the community try and tackle this, and post it here. We aren't looking for every possible point, just the most important ones. I'm sure someone out there doens't have anything bettr to do this weekend :} Let's also include units
and an option for a totalizer (which I am not sure we have tags for yet).
blowdown and condensate meters sometimes report temperature compensated flows in lb/hr when used in steam systems.
Stephen FrankMon 24 Nov 2014
Thermal energy meters measure thermal power and energy by measuring flow rate and the temperature difference between supply and return water. Typical points under chilled water meter, hot water meter, etc. would be the following:
entering temp
leaving temp
temp delta
flow sensor // Not totalized
volume sensor // Totalized
power sensor // Not totalized
energy sensor // Totalized
For a supply-side meter, discharge and return are alternatives to entering and leaving.
In practice, I also include either source or load as a marker tag on the meter equip to show which convention is used to calculate the thermal energy, but these tags aren't formally defined in the Haystack standard.
Jason Briggs Fri 17 Oct 2014
We currently have a list of points for certain types of equips like, VAV or AHU. But we don't have a list of points for all of our meters. Can someone in the community try and tackle this, and post it here. We aren't looking for every possible point, just the most important ones. I'm sure someone out there doens't have anything bettr to do this weekend :} Let's also include units
power sensor
energy sensor
current sensor
current phase sensor
volt sensor
volt phase sensor
pf sensor
pf phase sensor
freq sensor
Denis OConnor Mon 20 Oct 2014
All of the water meters could have a:
"water flow sensor" with units of gal/min
and an option for a totalizer (which I am not sure we have tags for yet).
blowdown and condensate meters sometimes report temperature compensated flows in lb/hr when used in steam systems.
Stephen Frank Mon 24 Nov 2014
Thermal energy meters measure thermal power and energy by measuring flow rate and the temperature difference between supply and return water. Typical points under
chilled water meter,hot water meter, etc. would be the following:For a supply-side meter,
dischargeandreturnare alternatives toenteringandleaving.In practice, I also include either
sourceorloadas a marker tag on the meterequipto show which convention is used to calculate the thermal energy, but these tags aren't formally defined in the Haystack standard.