In addition to what has been discussed in the VAV Set points thread, I would like to put these additional points and tags out for comment by the community.
Additional VAV points needed
discharge air flow effective sp
discharge air flow max sp
discharge air flow min sp
discharge air flow maxReheat sp
discharge air flow standby sp
zone air co2 sp
Other additional terminal unit points needed
zone occupancy sensor
statusMode: heating | cooling | reheat | morning warm-up | night purge | etc
With combinations of these tags any type of VAV terminal unit could be modeled.
Brian FrankThu 23 Apr 2015
discharge air flow effective sp
So the different list of discharge flow setpoints is:
min/max
effective
maxReheat
standby
Just to compare that to final zone temp setpoints:
effective
occ cooling/heating
unocc cooling/heating
standby cooling/heating
Is it correct that there isn't more symmetry b/w the two? For example do discharge flow have different setpoints have occ vs unocc or cooling vs heating?
occupancy
I think we want to reuse the lighting occupancyIndicator tag? Or would we like to just shorten it to occupancy sensor in both places?
statusMode
I think we need more input to get a comprehensive list with detailed description of each mode.
singleDuct
Paul I talked about the need for this tag to compliment the existing dualDuct and tripleDuct tags. Think we should also annotate AHUs with this tag instead of leaving it as assumed.
ductSize
This would be a Number value - what are imperial and SI units used for this?
I think the other equip level tags are pretty straight forward.
Paul BergquistThu 23 Apr 2015
discharge air flow effective sp
Is it correct that there isn't more symmetry b/w the two? For example do discharge flow have different setpoints have occ vs unocc or cooling vs heating?
Typically they do not since the flow is driven off the occ/unocc/stanby and cooling/heating modes it is already "baked in".
There is one manufacturer that has one additional - discharge flow min unocc sp, so that it can be reset lower in the unoccupied mode.
occupancy
I think we want to reuse the lighting occupancyIndicator tag? Or would we like to just shorten it to occupancy sensor in both places?
My feeling is that indicator and sensor have two distinct meanings. Indicator is usually the result or output of something like an indicator light vs. sensor which is used for other sensor types. My vote is to use sensor if it is a sensor point for consistency.
stautsMode
I think we need more input to get a comprehensive list with detailed description of each mode.
COOLING Controller is controlling the Cooling mode.
HEATING Controller is controlling the Heating mode.
REHEAT Controller is controlling the Reheating mode.
MORNING WARM- UP The main AHU is supplying warm air.
NIGHT PURGE The main AHU is supplying fresh (100 percent outdoor) air.
PRESSURIZE The box damper is set at Press damper position sp.
DEPRESSURIZE The box damper is set at Depress damper position sp
MANUAL POSITION The box damper is set to manual damper position sp.
all others would be very specific to the manufacturer.
ductSize
This would be a Number value - what are imperial and SI units used for this?
ductSize (area) would be ft² or m²
Paul BergquistThu 23 Apr 2015
We should use ductArea in lieu of ductSize. ductSize(diameter) would be the configuration point that the controller would use to calculate ductArea(ft² or m²).
Christian TremblayThu 23 Apr 2015
Regarding air flow sp we work with :
* Occupied clg min sp * Occupied clg max sp * Occupied htg min sp * Occupied htg max sp * Unoccupied clg sp * Unoccupied htg sp
The four occupied setpoints are used by ASHRAE in Guideline 36 sequences.
Paul Bergquist Mon 13 Apr 2015
In addition to what has been discussed in the VAV Set points thread, I would like to put these additional points and tags out for comment by the community.
Additional VAV points needed
Other additional terminal unit points needed
Additional VAV equip level tags needed
With combinations of these tags any type of VAV terminal unit could be modeled.
Brian Frank Thu 23 Apr 2015
So the different list of discharge flow setpoints is:
Just to compare that to final zone temp setpoints:
Is it correct that there isn't more symmetry b/w the two? For example do discharge flow have different setpoints have occ vs unocc or cooling vs heating?
I think we want to reuse the lighting occupancyIndicator tag? Or would we like to just shorten it to
occupancy sensorin both places?I think we need more input to get a comprehensive list with detailed description of each mode.
Paul I talked about the need for this tag to compliment the existing dualDuct and tripleDuct tags. Think we should also annotate AHUs with this tag instead of leaving it as assumed.
This would be a Number value - what are imperial and SI units used for this?
I think the other equip level tags are pretty straight forward.
Paul Bergquist Thu 23 Apr 2015
Typically they do not since the flow is driven off the occ/unocc/stanby and cooling/heating modes it is already "baked in".
There is one manufacturer that has one additional - discharge flow min unocc sp, so that it can be reset lower in the unoccupied mode.
My feeling is that indicator and sensor have two distinct meanings. Indicator is usually the result or output of something like an indicator light vs. sensor which is used for other sensor types. My vote is to use sensor if it is a sensor point for consistency.
ductSize (area) would be ft² or m²
Paul Bergquist Thu 23 Apr 2015
We should use ductArea in lieu of ductSize. ductSize(diameter) would be the configuration point that the controller would use to calculate ductArea(ft² or m²).
Christian Tremblay Thu 23 Apr 2015
Regarding
air flow spwe work with :* Occupied clg min sp * Occupied clg max sp * Occupied htg min sp * Occupied htg max sp * Unoccupied clg sp * Unoccupied htg sp
The four occupied setpoints are used by ASHRAE in Guideline 36 sequences.
Regarding
ductSizeI agree that
ductAreais betterRegarding
occupancy sensorI'm not sure of the true meaning of indicator...