tajjmann's profile - activity

How do you hardsize aircondtioners by way of editing after assigning for instance a PTAC to a thermal zone. Which parameter(s) need to changed?

I need notes (from NREL or any other authentic source) on the difference between CYCLING PTAC DX COOLING ELEC HTG and PTAC DX COOLING ELEC HTG.

I am trying to model the attached and i made use of a PRT-VAV RH. I need 2 Air Handler Units in parrell instead i could only get them in series. Any idea on how to handle that?

How do i remove air from a thermal zone through the exhaust fan as depicted

I have developed this model and have almost no cooling at all but satisfactory heating energy use. I therefore used Ideal Air Loads in running the model and there was cooling. Also, i checked the airflow through the nodes from Results Viewer when I had a PTHP and there was zero flow rate for cooling months but when IDEAL Air Load was used there was adequate flow rate. What could I be missing? I suspect something is blocking the airflow. Attached is the link to the model

Julien Marrec From OpenStudio-Construction-Materials as shown in the figures. They represent the different kinds of wall and roof insulation but i need to understand what the numbers in SQUARE bracket depict.

I just read the explanation given but I don't think they are the same.

I am writing a paper and need to justify what exactly the number in the square brackets next to both roof and wall insulation in OpenStudio stand for? Could it be the R-Value for the assembly?

I am developing a model of commercial building and as party of the equipments in the building are Exhaust Fan. Any idea on how to model this?

How do you change an initial default construction "Office" to a "StripMall" to the whole building?

@Julien Marrec here you go!Lets see if the attached link works

Julien Marrec I cant figure out how to send the model. I tried to attach it and not sure if it was successful. I can email you the model if u make you email available to me.

@aparker the other fan on the OA intake is an ERV system and am very sure of the output variable @Julien Marrec

I developed a model with Packaged Terminal Heat Pump Air Loop with a Variable Speed Fan (Air Handler Unit). However, the model gives constant hourly fan energy values and this does not match the actual data. How do I get the fan energy to vary.

Attached is the hourly energy consumption of the measure and simulated model.

Update:

Here is the link to the OpenStudio Model

I developed a model with Packaged Terminal Heat Pump Air Loop with a Variable Speed Fan (Air Handler Unit). However, the model gives constant hourly fan energy values and this does not match the actual data. How do I get the fan energy to vary.

What exactly does the Availability Schedule Name Always On Discrete mean? Can anyone illustrate with an example?

I figured a way to solve the issue by installing EnergyPlus V 8.2 in the default folder C:\EnergyPlusxxx? (xxx is usually the version)

If you have installed in the Program Files folder, it crashes. OS systems seem sensitive to permissions in that folder.

I developed and run a model in OpenStudio and needed to access the IDF file. I tried 2 approaches: 1. Double click the (in.IDF) file from ...run\2-ModelToIdf-0. I got this first warning Continued but the results has the following errors "Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2015.08.03 10:12,IDD_Version 8.1.0.009 *** IDF Context for following error/warning message: *** Note -- lines truncated at 300 characters, if necessary... *** 4779 Sizing:System, *** indicated Name=Packaged Rooftop Heat Pump *** Only last 10 lines before error line shown..... *** 4791 Yes, !- 100% Outdoor Air in Cooling *** 4792 Yes, !- 100% Outdoor Air in Heating *** 4793 0.0085, !- Central Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir} *** 4794 0.008, !- Central Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir} *** 4795 DesignDay, !- Cooling Design Air Flow Method *** 4796 0, !- Cooling Design Air Flow Rate {m3/s} *** 4797 , !- Supply Air Flow Rate Per Floor Area During Cooling Operation {m3/s-m2} *** 4798 , !- Fraction of Autosized Design Cooling Supply Air Flow Rate *** 4799 , !- Design Supply Air Flow Rate Per Unit Cooling Capacity {m3/s-W} *** 4800 DesignDay, !- Heating Design Air Flow Method * Severe * IP: IDF line~4800 Invalid Number in Numeric Field#13 (Zone Maximum Outdoor Air Fraction), value=DESIGNDAY, in SIZING:SYSTEM=PACKAGED ROOFTOP HEAT PUMP * Warning * IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details. * Severe * IP: Possible incorrect IDD File * ~~~ * IDD Version:"IDD_Version 8.1.0.009" * ~~~ * Version in IDF="8.2" not the same as expected="8.1.0" * ~~~ * Possible Invalid Numerics or other problems * Fatal * IP: Errors occurred on processing IDF file. Preceding condition(s) cause termination. ...Summary of Errors that led to program termination: ..... Reference severe error count=2 ..... Last severe error=IP: Possible incorrect IDD File *** Warning: Node connection errors not checked - most system input has not been read (see previous warning). *** Fatal error -- final processing. Program exited before simulations began. See previous error messages. *** EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors. *** EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors. *** EnergyPlus Terminated--Fatal Error Detected. 1 Warning; 2 Severe Errors; Elapsed Time=00hr 00min 1.35sec"

1. Following the path C:\Program Files\OpenStudio 1.7.0\share\openstudio\EnergyPlusV8-2-0 to open EnergyPlus Version 8.2 and call the said file (in.IDF) but got this error .

Any idea?

I have a model with a Chiller hooked to 2 Air Handler Units as depicted in the schematic below. How do i model the removal of air (50% and 80%) from each zone through to the Exhaust in OpenStudio.