Abarker's profile - activity

Hi @Greg Estep, thanks for the suggestion. I hadn't thought to switch to a different object type, however when doing so

HeatPump:PlantLoop:EIR objects not operating with geo connection I have a building where I am using the HeatPump:PlantLo

I have a VAV system with a minimum flow fraction of 35%, however for some reason the minimum flow is limiting itself to around 49%.

I have verified that:

• The Outdoor air rate is less than the minimum 35% flow, and set as Fixed Minimum
• After quadruple checking all inputs, they all agree that 35% is the minimum requested flow rate, not 49%. The 35% is corroborated by reviewing the HTML output. It is only when looking at hourly reporting that I noticed that the flow never goes below 49%.

I have also verified that it is the percentage of total flow that is what is somehow being specified, not the actual flow. I verified this by modifying the maximum flow rate input and noticing that the minimum flow rate adjusted as well, maintaining the exact same percentage. This also leads me to believe it is not limiting itself to some demand that needs to be met.

This is a model right out of HVAC Template. What am I missing or forgetting, as it seems I have inadvertently indicated a minimum flow of ~49%. Is there some known reason a VAV system would do this?

IDF file is attached.

The AirLoops in question are labelled AHU101 and AHU201.

it can be seen from the HTML outputs that the minimum flow of these systems are 35% of their max flow, e.g. 4.64 m3/s for AHU101.

Hourly output reports however confirm that AHU101 is only reducing its flow to ~6.6 m3/s.

I agree, though not the outcome I wanted or initially expected it is correct. Thanks again for the help.

Thanks for checking It is certainly a strange system type and not a common thing here in Canada. The air is only temper

Thanks again @Keigo, I have pasted a Dropbox link to the IDF file below. https://www.dropbox.com/s/u4xhn6bi2x22szj/MinF

Hi @Keigo and thank you. I edited the original post to add more context and I thought I had added the IDF file by using

VAV minimum flow rate higher than what is specified in EnergyPlus I have a VAV system with a minimum flow fraction of 35

Hi and thank you. I edited the original post to add more context and I thought I had added the IDF file by using the at

VAV minimum flow rate higher than what is specified in EnergyPlus I have a VAV system with a minimum flow fraction of 35

VAV minimum flow rate higher than what is specified in EnergyPlus I have a VAV system with a minimum flow fraction of 35

VAV minimum flow rate higher than what is specified in EnergyPlus I have a VAV system with a minimum flow fraction of 35

VAV minimum flow rate higher than what is specified in EnergyPLus I have a VAV system with a minimum flow fraction of 35

VAV minimum flow rate higher than what is specified in EnergyPLus I have a VAV system with a minimum flow fraction of 35

VAV minimum flow rate higher than what is specified in EnergyPLus I have a VAV system with a minimum flow fraction of 35

I am trying to model a 4 pipe fancoil with 4 discrete speeds which remains ON at the lowest speed when there is no load, never turning off. I've created the 4 discrete speeds in the Fan:SystemModel object and set the ZoneHVAC:FourPipeFanCoil Capacity Control to MultiSpeedFan or Cycling, which both give very similar results. However, both of these still cycle the fan off when there is no load. Any of the other Capacity Control Methods that might work aren't valid with a Discrete control strategy.

Is there a combination of inputs that can do what I'm looking for between these two objects? I fear I am under reporting my fan energy by allowing the fan to cycle off.

The answer to this turned out to be a simple one. I didn't realize that when choosing the MutliSpeedFan control option

Fan:Systemmodel and ZoneHVAC:FourPipeFanCoil control methods I am trying to model a 4 pipe fancoil with 4 discrete speed

Hi everyone,

I've seen similar questions asked here but haven't found the answer to what I'm looking for.

Why would a variable speed pump run constantly throughout the year on a condenser loop, regardless of the load? I'm in a heating dominated climate so would expect condenser loop pump energy to be 0 in the winter.
Looking at monthly reports, the chiller, variable speed chilled water pump, and cooling tower all show this trend (varying with load, with much less or no energy in heating monthd), yet the condenser pump maintains the same flow throughout the year.

Pump control type is 'intermittent' Chiller flow mode is 'not modulated' Cooling tower is variable speed The design water flow rate of the cooling tower and its respective pump are hard sized and very similar to each other.

Any insights are appreciated.

For the record, eQuest does the same thing and I have always been bothered by it as I know this is not how this system operates in reality.

Thanks in advance,

Adam

We are trying to model a dedicated outdoor air system that modifies its flow based on a time of day schedule.

By adding a fractional schedule to the Maximum Fraction of Outdoor Air Schedule Name in the Controller:OutdoorAir object, this achieves the desired reduction in outdoor air. However, the flow in the AirLoop itself does not change and the system becomes a recirc systems at hours where the max OA fraction is scheduled to be less than 1.

As a result we don't see the fan power savings we expect, and also now have to contend with recirc air which isn't real. Is there a way to get the whole air systems flow rate to follow our fractional schedule?

Hi @Yueyue_Zhou, I believe I have now edited the original message to attach the model file but I don't see it anywhere (

Hi @Yueyue_Zhou, I believe I have now edited the original message to attach the model file but I don't see it anywhere (

Hi @Aaron Boranian, the model geometry was built using the OS SketchUp plugin and then edited further in IDF editor. Al

Can DOAS AirLoop flow rates be scheduled? We are trying to model a dedicated outdoor air system that modifies its flow b

Can DOAS AirLoop flow rates be scheduled? We are trying to model a dedicated outdoor air system that modifies its flow b

Can DOAS AirLoop flow rates be scheduled? We are trying to model a dedicated outdoor air system that modifies its flow b

Can DOAS AirLoop flow rates be scheduled? We are trying to model a dedicated outdoor air system that modifies its flow b

@yashar it might depend on how TEDI is specifically defined for the standard your looking at, but generally your descrip

I had a similar thing happen to me, in a unique situation where some of my zones have very very high peak internal gains

Ground Loop combined with boiler and cooling tower, temperatures too cold I'm trying to model a GroundHeatExchanger:Syst

Ground Loop combined with boiler and cooling tower, temperatures too cold I'm trying to model a GroundHeatExchanger:Syst

DistrictHeating and Boilers on same HW loop causing temp issues Is there any reason why having a DIstrictHeating object

Update - I have revised my approach to this set up, however my issue remains. My changes: - Realizing the heat recovery

Attaching a Generator:InternalCombustionEngine unit to a plant loop I am attempting to create a plant loop which provide

Thanks very much Yi, this worked! Simple solutions are the best solutions.

I was wondering if there were any known issues regarding using JEplus and Energy Plus version 9.0.

I am running into an issue where my JE Plus project is validated and runs well, however is not compiling any results. I have narrowed the issue down to my version 9.0 projects only, as it has always worked very well for version 8.8. I have just verified this by running JEplus on a version 8.8 project and verifying the results are produced (e.g. SimResults.csv shows complied results).

I then updated the Energy Plus file to version 9,.0, ran it again in JE Plus with all else equal, and am not able to produce complied results (SimResults.csv file is empty). I note that the model does simulate with no issues as all of the individual output files are created in their folders.

Is there another setting specific to version 9.0 that I should be changing to get it to work with JEPlus? I am using version JEPlus v1.7.2.

Below is the .rvi file I am using, which is quite simple (I almost always this rvi file for most projects so am confident it works):

eplusout.mtr eplusout.csv Electricity:Facility Gas:Facility HeatingCoils:EnergyTransfer 0

here are my output meters:

Output:Meter,Electricity:Facility,Annual;

Output:Meter,Gas:Facility,Annual;

Output:Meter,HeatingCoils:EnergyTransfer,Annual;

Any help appreciated.

Adam

JE Plus not working with Energy Plus v9.0+? I was wondering if there were any known issues regarding using JEplus and En

Thank you for looking into it. It seems to go beyond that, with the condenser pump running at full flow rate even when t

Condenser Loop - Pump:VariableSpeed always running Hi everyone, I've seen similar questions asked here but haven't foun

Commenting to say that I was able to rectify this situation by modifying the preheat coil temperature set-point of the s