jbatt's profile - activity

Thank you David!

Set WWR by Facade - does the "don't alter spaces not included in building floor area" work? My hope using this was that

Set WWR by Facade - does the "don't alter spaces not included in building floor area" actually work? My hope using this

Set WWR by Facade - does the "don't alter spaces not included in building floor area" actually work? My hope using this

My quick workaround was to calculate the WWR on occupiable zone walls that would result in the desired overall WWR, ente

How can geomeppy be used to modify e-plus reference building WWR? I was attempting to use geomeppy's set_wwr on a medium

I've been finding that inputs entered into OS:Sizing:System in the OpenStudio HVAC loop interface oftentimes do not translate correctly into the Sizing:System object in the IDF that the model generates. In the images attached, Central Heating Maximum System Air Flow Ratio is hardsized in OpenStudio, but autosized in the IDF. I have noticed this issue for Central Heating Design Supply Air Temperature, 100% Outdoor Air in Cooling, and 100% Outdoor Air in Heating. I have performed basic troubleshooting - ensuring that I save entries before re-running, that I am comparing to the updated IDF, and that I'm pulling from the right directory. Is there an explanation for this model behavior and any known troubleshooting methods?

Yes - by necessity I'm working with OS 2.7.0/EP 9.0, but I can adjust my workflow to make direct IDF edits on these fiel

IDF Sizing:System Parameter Values Disagree w/ OpenStudio Model I've been finding that inputs entered into OS:Sizing:Sys

I am finding that the Constant Minimum Air Flow Fraction parameter in my AirTerminal:SingleDuct:VAV:NoReheat object is not functioning according to my understanding of how it is supposed to. When I change this value (from the default of 0.3) to 0. It zeros the flow from the terminal unit for the entire simulation (compare nodes 15 in the plots below - sorry for the line color disagreement). My prior understanding is that this input should only serve to establish the minimum airflow that the unit will supply while the system is on - not force the flow for the entire simulation. Is this somehow just an issue when a value of 0 is entered in this field?

This question came about as a result of a question I'd previously asked about fan control here as it led me to drop the minimum flow fractions to zero to ensure that this minimum wasn't forcing the fan to run at times when there was no demand.

Great! I was hoping that'd be the answer. This seems to have resolved my fan and terminal units issue. Thank you very mu

Strategy 2 sounded promising, but didn't work (just resulted in a flat 0 CFM over the entire simulation). For strategy 1

By this I mean, will it only adhere to the Night Cycle schedule during certain hours (or when unoccupied - N/A in my mod

I should have updated my image - I'm modeling a heating/recirculation only AHU. At the time I took the screenshot, I had

By that do you mean I have to hardsize it? I'd been allowing it to autosize.

Troubleshooting for unstable OpenStudio model? I'm having an issue where I get drastically different results between run

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Why is terminal unit airflow constantly 0 when minimum airflow fraction is set to 0? I am finding that the Constant Mini

Are you looking for heating and cooling usage or total gas and total electrical usage? Do you want this summarized on a

The HTML results include a breakdown by fuel-type, by end-use in the Annual Building Utility Performance Summary. It wil

The nature of this problem is that, in this case, flow (and thus fan operation) seems to be entirely decoupled from dema

The nature of this problem is that, in this case, flow (and thus fan operation) seems to be entirely decoupled from dema

No OA requirement or occupants in these zones. I thought maybe terminal unit min flow fraction was the answer, but when

I'm using the fan Fan:VariableVolume object as part of an HVAC loop. The loop includes a heating coil and VAVs serving h

Variable volume fan won't shut off I am modeling a heating only unit, in OpenStudio, and am having trouble getting the f

What purpose does the VRF Supply Air Fan Operating Mode Schedule serve? I am having some issues with unmet hours on my V

What purpose does the VRF Supply Air Fan Operating Mode Schedule serve? I am having some issues with unmet hours on my V

Update: I was able to fix this going facade-by-facade using the "Set Window to Wall Ratio by Facade" measure. Would stil

WWR measure creates windows that extend beyond surface boundaries I am trying to run the "Resize existing windows to mat

I am running into an issue, in OpenStudio, where the constant speed pump (intermittent control) in my HHW plant runs even when the boiler is not firing. As a result, the pump runs (cycling somewhat unpredictably) throughout the summer months, causing the HHW loop to continuously heat up - I assume due to waste heat from the pump.

I don't fully understand how the controls work by default, but I would assume that if there is a demand for heating at a coil, the pump runs, and then the boiler fires to maintain loop temperature (?). This would mean that something is telling the pump that there is a demand for heating; however, after assessing zone temperature, I can't see why that would be. Is there any basic troubleshooting around this issue (e.g. don't set the controls to intermittent)? Or, as a worst case scenario, is there some way I can force the pump off during summer months using an availability manager?

Thanks!

Hot Water Loop Plot

Thank you. You're right - it is to do with airside. Looking at it more closely, I see that during summer the pump is onl

HHW pump running even when boiler is off I am running into an issue, in OpenStudio, where the constant speed pump (inter

HHW pump running even when boiler is off I am running into an issue, in OpenStudio, where the constant speed pump (inter