OS-user-AT's profile - activity

thanks, that works. Should have found it myself..

how to change/update one's unmethours account ? Haven't found a way to change my website and email address associated wi

When running the EP weather converter on custom weather input files, warnings as below occur:

Warning ** Direct Normal Radiation=  1114.8 Wh/m² on date= 3/21 at hour=12
Warning ** Global Horizontal Radiation=  1211.4 Wh/m² on date= 4/ 9 at hour=14

This warnings seem to occur especially, if there has been rapid temperature rise in past few hours with changes in cloud cover, Wh/m² estimates ranging between appr. 1100-1550 in my test examples.

What are reasons for such warnings and what should be done in response ?

The warnings about invalid ScheduleTypeLimits can be eliminated by replacing the quoted ScheduleTypeLimits. The warning

Did you change the Zone Minimum Air Flow Input Method to Scheduled ?

did it work for you ?

Instead of directly manipulating mass flow rates, I would propose using Minimum Air Flow Fraction Schedule(s) for AirTer

Why do IT Equipment Air Inlet Temperatures deviate from Supply Air Node Temperatures ? My EnergyPlus model contains IT E

Why do IT Equipment Air Inlet Temperatures deviate from Supply Air Node Temperatures ? My EnergyPlus model contains IT E

OK, here is a temporary download link

OpenStudio crashing with IDF import (Versions 2.1, 2.5) When trying to import the IDF example file 1ZoneDataCenterCRAC_w

When opening DView (instead of ResultsViewer) for viewing OpenStudio 2.5. / EnergyPlus 8.9 results, DView adds a superfluous "**Design Day**" to every variable name, as you can see below:

In ResultsViewer, on the other hand, there is no such extension of variable names, which proves that DView display is wrong (including axes labels).

Can Software developers confirm this as a BUG ?

I have simple water loop as follows:

It contains the tank of an air-to-water heatpump water heater attached to a zone, and a hot water user.

When running the osm model, the simulation crashes with the following err messages:

Program Version,EnergyPlus, Version 8.9.0-eba93e8e1b, YMD=2018.06.20 10:13,
   ** Severe  ** <root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_name'.
   ** Severe  ** <root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_object_type'.
   ** Severe  ** <root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_schedule_name'.
   **  Fatal  ** Errors occurred on processing input file. Preceding condition(s) cause termination.
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=3
   ..... Last severe error=<root>[PlantEquipmentOperationSchemes][HotWaterLoop Operation Schemes] - Missing required property 'control_scheme_1_schedule_name'.
   ************* 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. 0 Warning; 3 Severe Errors; Elapsed Time=00hr 00min  0.17sec

Apparently, OpenStudio has generated an incomplete IDF file. Did I miss anything necessary to specify ?

I was using Windows10. Anyway, "Run for Sizing Periods" was meant in addition to running the simulation for the weather

comprehensive answer: THANKS !

here is a time-limited download link, but the reported phenomenon seems to be occurring with any idf model; have you no

A solution that works is as follows: Add a Maximum Outdoor Air Fraction Schedule to Controller:OutdoorAir which is EMS-

the entries for the VAV object are: AirTerminal:SingleDuct:VAV:NoReheat Name = Main Zone VAV Air

here is the time-limited download link:

Bien Sur ! To which email address should I send it, or can I directly upload it to unmethours ? (relatively small file)

This solution is OK if the HPWH has to deal with only one zone. In order to use it as an air cooling device, it is nece

Modeliing a premise with very high internal heat gains such as a data center, it looks reasonable to utilize the zone(s) warm exhaust air with air-to-water heat pumps for producing hot water and simultaneously cooling the air in the airloop. While IDF Editor allows inserting an air-to-water heatpump water heater into the airloop, EnergyPlus however identifies this as "invalid component" in the airloop.

Are there any good alternatives in OpenStudio or EnergyPlus to solve this problem ?

OS 2.5: PlantEquipmentOperationSchemes: missing property I have simple water loop as follows: It contains the tank of

Why does Controller:OutdoorAir not set OA-Flow to zero as specified ? I have a simple airloop as shown below: If Out

DView with incorrect variable descriptors When opening DView (instead of ResultsViewer) for viewing OpenStudio 2.5. / En

How to utilize zone exhaust air for heatpump water heaters ? Modeliing a premise with very high internal heat gains such

How to utilize zone exhaust air for heatpump water heaters ? Modeliing a premise with very high internal heat gains such

I am looking for the annual run results only, and the curves seem to be displayed correctly - it's only that the variabl

DView with incorrect variable descriptors When opening DView (instead of ResultsViewer) for viewing OpenStudio 2.5. / En

OpenStudio crashing with IDF import (Versions 2.1, 2.5) When trying to import the IDF example file 1ZoneDataCenterCRAC_w

Any Updates since 2014 worth mentioning ?

Any Updates since 2014 ?

How to combine CFD simulations with OpenStudio & EnergyPlus ? CFD simulations are often used for detailed airflow st

I see following difficulties with your recommendation: (1) displaying viewdata-report.html outside of OpenStudio: Fir

I see following difficulties with your recommendation: (1) displaying viewdata-report.html outside of OpenStudio: Fire

Yes, I think, you can also create interactive charts in R (check R packages for it) For simple plots, it takes only a s

Yes, I think, you can also create interactive charts in R (check R packages for it) For simple plots, it takes only a s

I mostly use R programming language (see open source CRAN website for download): It is easy to read in csv output from

HOW TO EMS with OpenStudio ? As M. Dahlhausen has pointed out in Question on Results Visualization, EMS can be run with