Mazen_094's profile - activity

@JasonGlazer The suspected bug is not in the Energy Plus application. It would be in the way HOW OpenStudio interfaces its input data with Energy Plus

@Archmage @JasonGlazer There seems a bug somewhere! I ran the simulation using Open Studio and Energy Plus for the out.idf file available in the following path: <osm_folder>\Built_stp7\run\3-UserScript-0 The Output Results available from the HTML file in the following path: <osm_folder>\Built_stp7\run\5-EnergyPlus-0\eplustbl.htm are different from those available from the HTML file that can be obtained by launching a separate EP simulation using EP Launch application. Where the results in both are different and those obtained from EP comply with the results from the spreadhsheet.Files're: Here

I share the same view about the first issue with David. For the second problem it seems the problem comes when the program accesses the corresponding object for the following line: 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 You can get further information about errors from the err file that exists here: <your_os_simulation_folder>\Built_stp5\run\6-UserScript-0. If I were in your place I would delete the whole object that causes this error and see whether the simulation runs

I ran the simulation again and checked that it gives a "detailed" output so that results are shown every 10 minutes. The program also scales the "Time not Comfortable" parameter with 1/6 to account for smaller time steps. However, the final sum gives the exact result I obtained in the previous simulation. The new output file can be found from here. And is called out2.

I would give Fanger's method a go when I sort out where the difference comes from for the default method. But like I said earlier to a colleague in the same thread: "The multi-zone calculation method may result in some surprises and so I ran my simulation with a single zone". The thermostat range is left default with +-0.2 tolerance and everything is left to default settings. You may want to have a look at the output results from here.

My simulated office is made up of only one zone. I know that the standard imposes the (OR) relation the unmet hours calculation and so I used a single zone to avoid surprises. I have exported the mentioned Output variable into a spreadsheet that contains: Timesteps, MRT temperature, Ta temperature, this variable, and some other similar variables. The complete details can be found from here. For each time step there seems a complete compliance with the operative temp & humidity curves of the 55-2004 standard. But the summation does not give the expected result.

Hi, In my experiments on EP, I have run a simulation for an office to analyse the results. I do not expect the results to comply with ASHRAE 55-2004 standard. I just want to check how the program calculates different parameters.

The last section of the performance summary shows that I have 3226.67 Not Comfortable hours. However, the sum of each of the following output variables:

*Output:Variable,*,Zone Thermal Comfort ASHRAE 55 Simple Model Summer Clothes Not Comfortable Time,hourly; !- Zone Sum [hr]

Output:Variable,*,Zone Thermal Comfort ASHRAE 55 Simple Model Winter Clothes Not Comfortable Time,hourly; !- Zone Sum [hr] 

Output:Variable,*,Zone Thermal Comfort ASHRAE 55 Simple Model Summer or Winter Clothes Not Comfortable Time,hourly; !- Zone Sum [hr]

neither gives this number. Any ideas how I will go about this issue?

Best, ///// Here you can find the modelled office file and the output file. The output file contains the "Time not Comfortable" output variable taken at hourly steps throughout one year. You may wish to have a look as a reference.

Cheers Edwin, From my limited knowledge of the matter. I would assume that off-the-shelf models are good middle solutions. Maybe adding an output variable browser in OS that addresses showing temperature distributions in 3D would be worthwhile. I would like to follow up that matter if OS has anything new regarding this issue. Thanks a lot for your response,

Hello all, Is there a way in OS or EP to measure temperatures at specific points in modelled space? Say I have an office and wish to measure temperatures at a point next to the PC, window, door, etc. Would it be able to also get radiant heat, environment heat from the simulation?

I am new to this business and would appreciate your valuable answers.

Best,