Neal Kruis's profile - activity

The version of Kiva integrated in EnergyPlus will be the most accurate as it accounts for more realistic boundary condit

@zahro You're correct. Kiva has a fairly simplistic model of interior short- and long-wave radiation. @Mantra this could

If you make the slab perimeter width equal to zero in Kiva, the entire slab will be "core". This is more equivalent to w

What software are you using? Can you add the appropriate tag to the question?

@zahro You will want to compare total heat fluxes through the foundation in Kiva to the total heat flux through the foun

It looks like you have 12 zones with slabs. Each with different sizes. You need to compare each of these to a separate K

Try changing your deep ground boundary condition to ZeroFlux. The Autoselect option will change the depth of the water t

Here are some questions to look into: What are the actual zone temperatures in EnergyPlus? Are they different than the

@Julien Marrec the "More..." issue should be fixed now.

Thanks, @Julien Marrec. I'll check up on this issue.

@Molly Curtz, You can use either task manager or resource monitor on windows to see what percent of your memory a specif

@Molly Curtz, You can use either task manager or resource monitor on windows to see how much memory a specific task (e.g

@gaofeng can you send an example IDF?

@geofeng can you send an example IDF?

@Avi, are you still experiencing this? What version of EnergyPlus are you using? There was a fix for a similar problem i

For core zones, the Kiva uses a 1-D finite difference method to calculate heat exchange between the zone and the deep gr

The ASHRAE project ended up not getting integrated into EnergyPlus proper. However, since then there has been a similar

Fatal error when using energyplus This is a severe error and am unable to rectify it.... Severe ** Control Type Schedu

Fatal error when using energyplus Severe * Control Type Schedule=ZONE CONTROL TYPE * ~~~ * ..specifies contr

Fatal error when using energyplus Severe * Control Type Schedule=ZONE CONTROL TYPE * ~~~ * ..specifies contr

Euclid IS the Legacy OpenStudio Plugin. It is the only way (that I'm aware of) to create an EnergyPlus IDF file directly

Euclid will not interpret normal SketchUp surfaces as EnergyPlus surfaces unless they are drawn in an EnergyPlus zone gr

@hzfywqr What software are you using? Please tag your question with the name of the software so others know how to best

That's a good approach! You can use the indoor air temperatures from EnergyPlus as input in Kiva and generate a PNG snap

At this point there is no way to output temperatures within the slab or the soil surrounding the foundation. The tempera

Glad to help! Thanks for the kind words!

Heat transfer through transparent surfaces in EnergyPlus is calculated using a steady-state heat balance across each pan

When the planets align : ). The committee is working hard towards an advisory public review. Hopefully the APR will be out this summer. The real question is when will the standard be adopted.

Correct. The effectiveness of the outdoor coil will depend on the density of air flowing across it. This must be implicitly characterized by your EIR and capacity curves, EnergyPlus will not account for this automatically. I'm not aware of anyone quantifying this impact, but it is covered by the upcoming ASHRAE Standard 205.

Yes. EnergyPlus calculates the outdoor barometric pressure based on elevation. Density of air within the air systems is calculated based on outdoor barometric pressure.

You need to install SketchUp.

@aysgldmir what software are you using? Please tag it in your question so it's easier to help you.

@ChunHang_Ang what software are you using? Please include this in your tags so we can better help you.

You can create a custom EMS output variable using the built-in Year variable. It will be a separate column in your output, but at least it will appear somewhere.

Keep in mind that if you are using a TMY weather file the year value will jump around for each month and probably won't be very useful.

I am investigating the affects of precooling and thermal energy storage on a couple of different building models. I have implemented a time of use utility tariff structure using a measure. I would expect to see cost savings for both precooling and TES but when I run the simulations against my baseline case I get a greater Total Energy Cost vs my baseline case. However, I get a lower Process Subtotal for both precooling and TES when compared to the baseline case. Any insight into how both of these outputs are calculated are greatly appreciated.

@adhilton we just fixed MathJAX. Sorry for the trouble.

No worries, @Silvano! Looks like someone else helped out.

What software are you using? Please use the tags to indicate.

Can you be more specific? What exactly the problem? If the heat gains are greater than the losses, you should see either a) the gains offset by a cooling system, or b) a rise in zone temperature. If you are not seeing one of those two responses, then there may be an energy balance problem.

@Eric Ringold, and @Jason DeGraw this should be fixed now. Let me know if you still have problems.

It's hard to believe this question hasn't been asked before, but I couldn't find it. Plenty of similar questions for historical and real weather data:

• What are the available sources for historical weather data?
• What is the best way to create an EPW weather file from real data?

but nothing that asks about the traditional "typical year" weather data that is used for design. So here it is:

Outside of energyplus.net (and this related site), what other sources are available for typical year weather data for locations that are not otherwise covered (or poorly covered)?