RCulham's profile - activity

I have seen many multi-residential buildings as well as large commercial buildings where a boiler is the source to heat

I am not clear as to how you use the openstudio-standards method to mimic a central air-to-water heatpump. Do you put t

I am not clear as to how you use the openstudio-standards method to mimic a central air-to-water heatpump. Do you put t

Although physically speaking an instantaneous water heater transfers energy from the boiler to the service water through

Since posting this question, the End-Use Subcategory "Water Systems" is reported in the EnergyPlus output report as a se

Since posting this question, the End-Use Subcategory "Water Systems" is reported in the EnergyPlus output as a separate

How do you assign instantaneous water heater load to water systems? I have set up an instantaneous water heater to a ser

Why is DOAS Fan Air Flow Rate inconsistent with design OA flow rate I set up a DOAS system with uncontrolled diffusers d

Why is DOAS Fan Air Flow Rate inconsistent with design OA flow rate I set up a DOAS system with uncontrolled diffusers d

Thank you Eric for your feedback. That quotation mark was a catalyst for me to study deeper into Ruby. The revised mea

Good day Eric. I have been working with this measure. I had to drop the quotation mark in your code line at .to_IddObje

Good day Eric. I have been working with this simple measure. I had to drop the quotation mark in your code line at .to_

Eric, I appreciate your answer to steer this measure in an easier direction. Within the measure, I created a new run me

What OpenStudio measure will create an EnergyPlus Zone Component Load Summary Report Adding an EnergyPlus ZoneComponentL

I have had to perform energy modelling for many large multi-story residential buildings as well as small residential bui

Why is the zone component report showing massive delayed sensible loads? This is an OpenStudio/EnergyPlus project featur

Why has air terminal flow rate changed due to a version upgrade? I had created a project in OpenStudio 2-5-0 which uses

Hello umop-3pisdn. I only had one project where in I required horizontal black out insulating curtains. This could be

I built a simple one-zone model with constant flow, floor, low-temperature radiant heating and cooling in OpenStudio Version 2-5-0 with EnergyPlus 8.9. To build the model, I started with the AedgOfficeHVACRadiantDOAS measure. Since there is no ventilation or outdoor air in the model, I deleted the Air Loop.

When I ran the model, the HVAC Sizing Summary report shows the correct zone heating and cooling load. However, though the Component Sizing Summary shows the design hydronic tubing length, it does not report and flow in the chilled water or the hot water loops or the capacity of the chiller or the boiler.

Leaving the floor construction as an internal source construction, I replaced the radiant heating panels, with simple hydronic space heating, attached it to the hydronic plant heating loop and deleted the chilled water loop. Running this simplified simulation, the program then reported the plant heating loop flow and the boiler size.

To double check, I ran the model in OpenStudio App 1.1.0 with EnergyPlus 9.4 and got the same results.

It seems like the radiant panels are not connecting to the plant loops, yet they are graphically shown to be so in the HVAC systems tab. I am wondering why the program is not reporting the capacity of the chiller or the boiler and the corresponding flow rates?

Thank you Julien for your suggestions as it prompted me to dig further. I tried AllSurfaces and that did not make a c

Why no plant loads showing in component load summary - radiant? I built a simple one-zone model with constant flow, floo

Why no plant loads showing in component load summary - radiant? I built a simple one-zone model with constant flow, floo

In the absence of knowing the details of your base model, you have to set up a heating, air-conditioning and ventilation

Matt Doiron thank you for your answer. These systems may be come more prevalent on future projects.

Try the following: Load the osm file into SketchUp. Export it as an idf file. Open the stand alone EnergyPlus EPLaunc

You may also try with a backup copy of your osm file the following: Within Sketchup go to: Extensions\OpenStudio User

There was a single family residence example in the DOE-2 Sample Run Book with a publication date of November 1993. It i

There was a single family residence example in the DOE-2 Sample Run Book with a publication date of November 1993. It i

What is the best way to model water cooled DX units in EnergyPlus On my most recent energy simulation project, I had to

This might work: Make the clerestories with solid walls and a solid roof first on the main surface. Create windows in

Good morning Avi, I apologize for the delay in figuring out how to post a link. Also, before posting the files, I had t

I am modelling a fan powered desiccant dehumidifier to control the humidity in a zone adjacent to a large zone with predominately high temperature and relatively lower humidity. The desiccant dehumidifier features face and bypass dampers on the desiccant wheel with its own supply fan rated at 2250 cfm. The conditioned air enters a return air mixer connected to a air handling unit with heating and cooling coils an its own supply fan rated at 3500 cfm. The air handling unit heats or cools to maintain the zone setpoint temperature. In the off mode the desiccant dehumidifier is isolated from the air handling unit air loop. The desiccant dehumidifier maintains the zone humidity by modulating the face and bypass dampers. As there are no supply side splitters in and mixers in the supply side equipment in EnergyPlus other than an outdoor air mixer, I have simplified the model of the system such that there is no face and bypass on the desiccant wheel and there is only when supply fan rated at 2250 cfm and there are no isolation dampers and the there is no return air mixer between the dehumidifier and the air handling unit.

How do I model the regen air from the adjacent zone where the standard method is to use outdoor air? I am currently looking at the AirflowNetwork objects in EnergyPlus possibly using the RoomAirNode:AirflowNetwork object for the adjacent zone.C:\fakepath\Image (231).jpg

Thank you for your response MJ Witte. Using the Zone Air Exhaust Node from the adjacent zone is a simple fix. I now wi

How do you model Desiccant Regen Air from Adjacent Zone? I am modelling a fan powered desiccant dehumidifier to control

Since the majority of the building space is being cooled by unconditioned outdoor, in conjunction with zone heating equi

Thank you Avi for raising this issue. I have also found that removed objects in HVAC loops appear not to be deleted also

Dealing with indoor pools is something I looked into many years ago. There are two key factors when dealing with indoor

Why is the zone exhaust fan not controlled by zone temperature? I am modelling a simple HVAC system in OpenStudio 2.5.0.

Why are the variables not clearing in the OpenStudio idf file? I am using OpenStudio 2.5.0 for a project. I selected so