rraustad's profile - activity

The loss of temperature control is likely due to undersized cooling coil(s). You can tell this by looking at a day where

Probably should be using cycling fan mode and also check the cooling EIRfPLR curve to make sure it represents the VS com

Disregard the warning for now. We are working to correct the problem in https://github.com/NREL/EnergyPlus/pull/10435

It appears from the warning message that you have set the temperature set point to a humidity ratio instead of a tempera

It appears from the warning message that you have set the temperature set point to a humidity ratio instead of a tempera

The effect will be to NOT overcool to meet the dehumidification load. If you plot zone temperature/RH and cooling coil o

See discussion at https://github.com/NREL/EnergyPlus/pull/10435

@mjwitte is working on modifying this warning message to be more clear. He noted that the CW temperature set point is li

Also show the Setpointmanager:MultiZoneHumidity:Maximum and MInimum objects so I can see where the issue is coming from.

And now show this object: Chilled Water Loop Setpoint Node List

Can you paste in the SetPointManager:Scheduled object used for this cooling coil? Or add it to your question above.

Yes, that is your water coil controller. But you also need SetpointManager* objects to place a temperature set point and

It appears from the warning message that you have set the temperature set point to a humidity ratio instead of a tempera

It appears from the warning message that you have set the temperature set point to a humidity ratio instead of a tempera

I am looking at the HVAC Sizing summary in the latest version of EnergyPlus and I do see "total" coil capacity. Dependin

Does this help? It looks like it's hours, occupancy * hours, and occupancy when > 0 * hours. So total occupancy * hou

Does this help? It looks like it's occupancy * hours, and occupancy when > 0 * hours. So total occupancy * hours and

Does this help? It looks like it's occupancy * hours, and occupancy when > 0 * hours. So total occupancy * hours and

Does this help? It looks like it's occupancy * hours, and occupancy when > 0 * hours. So total occupancy * hours and

Does this help? state.dataHeatBalFanSys->ZoneHeatIndexHourBinsRepPeriod(ZoneNum, ReportPeriodIdx)[0] += state.dataGl

It may be that the Sizing:Zone Zone Cooling Design Supply Air Humidity Ratio is higher than what is calculated for the c

The warning shows Rated Vol Flow Per Watt=[1.648E-005] which is very low. You might try increasing the supply air temper

I am not familiar with this model but it may be that the comment is wrong. It looks like these coefficients are applied

Your EIRfPLR curve looks correct. However, this curve is not properly implemented in code. The EIRfPLR should output a c

Your EIRfPLR curve looks correct. However, this curve is not properly implemented in code. The EIRfPLR should output a c

Your EIRfPLR curve looks correct. However, this curve is not properly implemented in code. The EIRfPLR should output a c

Your EIRfPLR curve looks correct. However, this curve is not properly implemented in code. The EIRfPLR should output a c

A heating set point temperature of 24 C means there will be a heaing load in the zone if the zone temperature is predict

Yes, that is the issue. The cooling and heating air flow rate was 0. At least this question shows that the messge you go

Do you have many surfaces and zones? Could the number of surfaces or zones be reduced? What type of HVAC and/or plant? H

Do you have many surfaces and zones? Could the number of surfaces or zones be reduced? What type of HVAC and/or plant? H

There are several things that can speed up the simulation. 1) set the minimum time step to 1 hour and maximum iteration

I know there is a person on this site that answers PCM questions and has done much work on PCM simulation, claims to be

The above reports provide the delivered capacities. You can look at zone loads using these. Remember if the zone set poi

The above reports provide the delivered capacities. You can look at zone loads using these. Remember if the zone set poi

I don't use OS. I run E+ directly.

If you search the Engineering Reference for "ZoneCrossMixing" you will see the equations.

This is easy to test with your file. Just remove the ZoneCrossMixing objects and compare the eio results with the origin

The easiest way to tell is to run a file with and without the object and check the zone/system sizing details in the eio

I am not an expert in OpenStudio. It does sound like the Space/Properties/Airflow section is the place your looking for.

In the zone sizing object, Sizing:Zone, there is an input for the zone design outdoor air flow rate. The PT unit in that