Keigo's profile - activity

DOAS is not autosized correctly I found a weird behaviour of autosizing. For DOAS, when a zone, some zones or all zones

EnergyPlus Crashes with Desiccant System I want to model desiccant system, but EnergyPlus crashes. There is not so much

I might be able to help you in part. 90.1-2019 has addenda: Addenda af, bc, cd, and db to Standard 90.1-2019 (November

I might be able to help you in part. 90.1-2019 has addenda: Addenda af, bc, cd, and db to Standard 90.1-2019 (November

That issue is about air flow rate (air-side), isn't it? I always have an unreasonable result in plant coincident sizing

When we run simulation with Coincident sizing, the html summary report shows Initial Design Capacity/Flow Rate/Power Consumption, etc. and Design Capacity/Flow Rate/Power Consumption, etc. I can't find clear explanation of these Initial Design values and Design values in I/O Reference and Engineering Reference. Does anyone know what they mean?

I guess that Initial Design values are intermediate products during Coincident sizing and Design values are the final results of Coincident sizing which are used in annual simulation.

However, I often get weird results. As an example, I show you the chiller sizing results of NonCoincident sizing and Coincident sizing with 5ZoneVAV-Pri-SecLoop.idf (V23-2-0) below.

The chiller capacity is

Initial Design Capacity in Coincident sizing < Design Capacity in NonCoinsident sizing << Design Capacity in Coincident sizing.

Due to the nature of Coincident sizing, it cannot be greater than NonCoincident sizing. I think Coincident sizing in EnergyPlus has many bugs and is unusable. Hopefully the bugs will be fixed at some point. As a first step, I want to know what Initial Design and Design mean.

Thank you for your answer! I haven't checked Output Details and Examples. My guess was correct, and plant coincident si

How to Go back through the history of all my Votes on UnmetHours I'm using the voting function on UnmetHours.com as book

What are "Initial Design" and "Design" in the summary report when running Coincident sizing? When we run simulation with

What are "Initial Design" and "Design" in the summary report when running Coincident sizing? When we run simulation with

@Aaron Boranian Thank you for your reply. I misunderstood. Yes, both the first example and the second example work corre

@Aaron Boranian Thank you for your reply. I misunderstood. Yes, both the first example and the second example work corre

Posted issue as https://github.com/NREL/EnergyPlus/issues/10399

@Aaron Boranian Interpolate to Timestep in Schedule:Day:Interval is set to "No" for the electric equipment schedule. So,

@Aaron Boranian I compared the end use at 04-SEP-08:09 shown in the html file and the end use at 04-SEP-08:08:34 shown i

@Aaron Boranian I compared the end use at 04-SEP-08:09 shown in the html file and the end use at 04-SEP-08:08:34 shown i

Time of Peak is not in Timestep increments A basic question. In the output files (html files), sometimes I see that Time

Why does no one mention ZoneVentilation:WindandStackOpenArea? It's the simplest model to try first, with no EMS or AFN,

Not an answer. The severe error has not yet been resolved. As I could not reproduce the the error with ExampleFiles, I

Time of Peak is not in Timestep increments A basic question. In the output files (html files), sometimes I see that Time

Time of Peak is not in Timestep increments A basic question. In the output files (htmls files), sometimes I see that Tim

You can see the dxf file after running the simulation, and you can open it in the 3D modelling tools (Rhino, SketchUp, e

ProportionalControlBasedOnOccupancySchedule does not work. You can raise the issue (https://github.com/NREL/EnergyPlus/i

@alex j Please report bugs here.

@alex j My results on 1 Jan are quite different from the Screenshot your attached. I would appreciate it if you could sh

Have you read EnergyPlus Version Compatibility? The latest DesignBuilder is compatible with EnergyPlus v9.4. You shoul

However the CentralHeatPump only seemed to go to mode 1,2,3... not mode 4 or 5. I just ran CentralChillerHeaterSyst

@raheel LEED Certification Reviewers vary greatly in their knowledge levels and there is no uniform interpretation of re

@Jamie Sullivan I supplemented my answer a bit.

Ok, you have already modelled the make-up air (fresh air ventilation). What are your settings of RoomAirModelType? I c

Are you using Balanced Exhaust Fraction Schedule Name? I guess your zone has HVAC system other than Fan:ZoneExhaust.

This is not a perfect answer. There are many problems with your model, and this only points out some of them. You shoul

Coil:Heating:DX:MultiSpeed The rated waste heat fraction is needed to calculate how much waste heat is available at

Ok, you already have modelled the make-up air (fresh air ventilation). What are your settings of RoomAirModelType? I c

Ok, you already have modelled the make-up air (fresh air ventilation). What are your settings of [RoomAirModelType](htt

Ok, you already have modelled the make-up air (fresh air ventilation). What are your settings of [RoomAirModelType](htt

ASHRAE90.1-2010 specifies two requirements for Gas stoarge water heaters in TABLE 7.8. One is Et = 80%. The other is SL

ASHRAE90.1-2010 specifies two resuirements for Gas stoarge water heaters in TABLE 7.8. One is Et = 80%. The other is SL

ASHRAE90.1-2010 specifies two resuirements for Gas stoarge water heaters in TABLE 7.8. One is Et = 80%. The other is SL

According to your description, it seems that only the outdoor air is heated by TFA (Treated Fresh Air Unit) and there is

According to your description, it seems that only the outdoor air is heated by TFA (Treated Fresh Air Unit) and there is