nfonner's profile - activity

Why does Misc Equip change when modeling loop process loads? I found in the "Detailed Simulation Reports Summary.pdf" he

Why does Misc Equip change when modeling loop process loads? I found in the "Detailed Simulation Reports Summary.pdf" he

Monitoring IF (Air System Fan Electricity Energy == 0) && (Zone Air Humidity Ratio > 0.015) to reset Night Cy

Monitoring IF (Air System Fan Electricity Energy == 0) && (Zone Air Humidity Ratio > 0.015) to reset Night Cy

Monitoring IF (Air System Fan Electricity Energy == 0) && (Zone Air Humidity Ratio > 0.015) to reset Night Cy

Does anyone know a method or workaround within OpenStudio or E+ to activate an air handler based on high humidity (Zone RH > SP) when that system is scheduled off but "Use Night Cycle" is enabled?

(E.g. IF AHU Availability schedule = 0, zone temp <= SP, but zone humidity > SP, THEN cycle on system.)

I know with Trace 700 there is, conceptually, a workaround to create schedules with IF THEN statements (IF zone RH >SP, THEN override schedule value to 100). I've used this in the past to pin a sensible load on the zone so that it raised the temps of the zone whenever RH% > SP, thus activating the AHU, but I can't see how that even possible in E+.

This is a typical concern in buildings we work with and trying to lower zone temp to trigger more runtime hours isn't cutting it, nor is it time efficient to play a game of whack-a-mole in scheduling each individual unit available for all the individual hours where zone RH > SP.

Thanks for any input.

yep. I also changed the "CycleOn" to a "2" to avoid initialization errors. It seems to have worked to call the units ou

yep. I also changed the "CycleOn" to a "2" to avoid initialization errors. It seems to have worked to call the units ou

I'll try the suggestions and keep plugging away, but the 'AHU_1_NC_Status' is an actuator. Could be what's causing the

Got it working (ish) in E+ before measure writing, but now gas usage dropped next to nothing since the units would not c

Got it working (ish) in E+ before measure writing, but now gas usage has dropped next to nothing because the units would

Got it working (somewhat) in E+ before I attempted any measure writing, but now gas usage has dropped next to nothing be

Got it working (somewhat) in E+ before I attempted any measure writing, but now gas usage has dropped next to nothing be

Got it working (somewhat) in E+ before I attempted any measure writing, but now gas usage has dropped next to nothing be

Thanks for the direction Eric. Off to the measure writing guide.

night cycle based on humidity call Does anyone know a method or workaround within OpenStudio or E+ to activate an air ha

@David - Yes @Julien - Please use this link for both OSM files and both GBXML files. Also, Do I need to install OS 3.0

@David - Yes @https://unmethours.com/users/10/julien-marrec/ - Please use this link for both OSM files and both GBXML fi

As a short term solution for those experiencing this issue, the GBXML data exported from the SketchUp 2019 using OS V1.0

Failed to export gbxml? Having trouble importing GBXML from Sketchup and OpenStudio into other modeling tools. I get a

Failed to export gbxml? Having trouble importing GBXML from Sketchup and OpenStudio into other modeling tools. I get a

Failed to export gbxml? Having trouble importing GBXML from Sketchup and OpenStudio into other modeling tools. I get a

That was my plan B as well. I only need to review one measure, so I will just mumble and gripe for the meantime. Thanks again.

Thanks Eric. I did see that that particular measure has the capability, but for other intensive measures, it would be nice to simply copy/ paste the text out of the measure screen instead of relying on measure authors to provide that functionality each and every time. Just my opinion.

Is it possible to review at a later date the Apply Measure Now - Measure Output reporting information? Ie. I cannot find a way to save the reporting information or even copy/paste out to review later when applying measures.

This is not needed for simple measures, but for the DOE reference building and create 90.1 baseline building measures it would certainly help in troubleshooting and in verifying the measure output step by step.

Thanks, Nic

Is there a way to determine sky conditions for a given date and time as interpreted by EnergyPlus or the Radiance package for OpenStudio?

Basically, I have narrowed down all the other factors regarding showing compliance for LEED IEQc8.1 and this is the only thing I cannot seem to get my head around.

For now I am taking the Radiance output > Space101map.ill file in the ...run\1-Ruby-0\out\files\in\model\radiance\output\ts\Space_101\maps folder and ascertaining whether the space meets 2 single-point in time (3/21 9am & 3pm) metric of 10/500fc.

I know that the weather file is used to generate the sky conditions, but is there an ouput that tells me the exact condition for the hours chosen? If so, is there a way to override that condition to what is considered a "clear-sky."

Thanks,

I usually rely on ideal loads when modeling during the earliest stages of any design for evaluating architectural configurations and envelope considerations. I recently discovered that providing a schedule in the OS:DesignSpecifcation:OutdoorAir object does not apparently impact the energy associated with ventilation for a project. This is admittedly only a quick test, but I could not verify any changes at all in the ABUPS report when swapping out schedules.

Is there another controlling factor such as population or an "Hours of Operation" schedule that controls this say during unoccupied periods? For example, Trane Trace 700 controls system operation around a threshold of 5% population.

I see that the "Minimum Outdoor Air During Occupied Hours" reads 0.011 ACH for Simple Venitlation and the "Average Outdoor Air During Occupied Hours" reads 0.695 ACH for Simple Ventilation. Clearly something is controlling the OA rate. I just do not know what that variable is.

Lastly, where can I look to see the actual simple ventilation during a given timestep? Or, should I just give up on ideal loads if I am looking for this amount of feedback from the model?

Thanks for any help.

Nic

I am constantly seeing this warning:

* Warning * Calculated Relative Humidity out of range (PsyRhFnTdbWPb) * ~~~ * Routine=CalcMultiSpeedDXCoil:lowspeedoutlet, Environment=RUN PERIOD 1, at Simulation time=04/12 13:00 - 13:10 * ~~~ * Dry-Bulb= 3.21 Humidity Ratio= 4.897E-003 Calculated Relative Humidity [%]= 101.01 * ~~~ * Relative Humidity being reset to 100.0%

Any thoughts on if this is something I can ignore?

Appreciate the suggestion. I am interested in 8.4 for other reasons. I was using DesignBuilder, but will have to head into EPlus anyway to model desiccant dehumidification.

Only concern (as commented below) is the difficulty in reverse engineering the heat beam to act as a generic HW coil in the air stream. That is why I like the concept of the FCU with fan energy zeroed out. I'll try both to see which is the best fit. Right now the FCU has massive unmet hours.

Thanks Aaron. I did look at the 4PipeInduction as an alternative since it is more fitting (over the central AHU reheat coil) with the zoning aspect of the branch reheat coil. My only concern there was whether or not it was a significant departure given the induction for both cooling and heating. Another solution was to zero out fan energy in a heating only FCU. I think I will try both and see what the outcome is. Thanks again.

I am nearly convinced that simply modeling the system (diagram below) with in-zone equipment for reheat will be easiest, but I would like to see if anyone has feedback on alternative methods for modeling branch in-duct HW heating coils upstream of chilled-beams. Some zones also have perimeter HW radiant heating.

There is no simultaneous heating and cooling amongst the various downstream heating equipment and the chilled-beams.

Original Diagram (there is an inconsistency with the upstream supply fan location, but that is not at question.) C:\fakepath\AHU-1 Diagram.jpg

Alternative (Simple) method - radiant in-zone reheating equipment. C:\fakepath\AHU-1 Diagram - Simple.jpg