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2021-04-28 18:14:30 -0600 marked best answer Simulation time step can not be changed

I just describe my problem of using energyplus below: I just generated a IDF profile by openstudio sketchup plugin and then input this IDF profile into Energyplus Launch for simulation. The problem is no matter what time step I changed in the IDF editor, the simulation results are always in hourly time interval. I quite appreciate anyone who can put a light on this issue.

2020-11-24 05:55:50 -0600 edited question How to configure parallel branch pumps for fan coils in a chiller system

System sizing issues on a Primary-secondary chilled water system Hello everyone, I just developed a primary-secondary c

2020-11-24 05:55:42 -0600 edited question How to configure parallel branch pumps for fan coils in a chiller system

System sizing issues on a Primary-secondary chilled water system Hello everyone, I just developed a primary-secondary c

2020-11-09 10:12:18 -0600 commented answer How to configure parallel branch pumps for fan coils in a chiller system

Thank you very much, Mehrdad. As you said, the default operation mode for the plant loop sizing is heating mode. After i

2020-11-09 10:06:41 -0600 marked best answer How to configure parallel branch pumps for fan coils in a chiller system

Hello everyone,

I just developed a primary-secondary chilled water system to provided the chilled water for multiple ZoneHVAC:FourPipeFanCoil that are served as Zone Equipmentsin thermal zones. The current configuration of the system is like the figure as below and i also attach my osm file here for you guys to download https://drive.google.com/file/d/1bjju... : image description.

My question is how to configure my system according to the following figure.

image description

I want to use three pumps to serve the ZoneHVAC:FourPipeFanCoil that are distributed in different parts of a building. For example, the fan coils in 1st-3rd floors will be served by pump 1, and fan coils in 4th-7th floors will be served by pump 2 and fan coils in other floors will be served by pump 3. This configuration is very common in real engineering project, but i did not find a way to add a parallel branch for the fan coils and pumps. I read the Engineering Reference of Energyplus and it seems that only one splitter and mixer is allowed for the supply or demand half loop. Is anyone has an idea on how to handle this issue. Thank you Very much!

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2020-11-02 08:16:16 -0600 edited question How to configure parallel branch pumps for fan coils in a chiller system

System sizing issues on a Primary-secondary chilled water system Hello everone, I just developed a new primary-secondary

2020-11-02 07:28:43 -0600 edited question How to configure parallel branch pumps for fan coils in a chiller system

Issues on the Load distribution of Primary-secondary chilled water system Hello everone, I just developed a new primary-

2020-11-02 07:19:10 -0600 asked a question How to configure parallel branch pumps for fan coils in a chiller system

Issues on the Load distribution of Primary-secondary chilled water system Hello everone, I just developed a new primary-

2020-10-23 02:25:29 -0600 commented answer Why the value of "Zone Ideal Loads Zone Total Cooling Energy" changes with OA flow rate

Thank you my friend for your good suggestion. I will check the results based on your advice and come back to update this

2020-10-23 02:24:07 -0600 marked best answer Why the value of "Zone Ideal Loads Zone Total Cooling Energy" changes with OA flow rate

Hello everyone, I am using the ZoneHVAC:IdealLoadsAirSystem to calculate the zone cooling load for sizing a cooling coil. However, i have an issue on the output value of the "Zone Ideal Loads Zone Total Cooling Energy". I ran two simulation of the Ideal Loads Air System with different ventilation rate, and the ventilation rate of the second case is double of the first one. As expected, the output value of "Zone Ideal Loads Outdoor Air Total Cooling Energy" was doubled. However, what confused me was that the output value of "Zone Ideal Loads Zone Total Cooling Energy" had also nearly doubled. The two simulation had the same settings except the ventilation rate. My understanding is only the outdoor air load will change, while the Zone Ideal Loads Zone Total Cooling Energy should be unchanged. I have read the EnergyPlus document and know the several output variables related to the Ideal Load Air System follows the relation as below: Zone Ideal Loads Supply Air Total Cooling Energy + Zone Ideal Loads Heat Recovery Total Cooling Energy = Zone Ideal Loads Zone Total Cooling Energy+ Zone Ideal Loads Outdoor Air Total Cooling Energy I do not have heat recovery setting in my simulation. i cannot understand why the value of Zone Ideal Loads Zone Total Cooling Energy will change. The buidling is of single zone with 4 meters long and 4 meters wide with the the simulation performed under Guangzhou climate. The first simulation has OA flow rate of 10 m3/s and the load results are shown below: image description The second simulation has the OA flow rate of 20 m3/s and the load results are shown below: image description Hopefully you will give me some answers, Thank you guys.

2020-10-20 00:52:06 -0600 edited question Why the value of "Zone Ideal Loads Zone Total Cooling Energy" changes with OA flow rate

Why the value of "Zone Ideal Loads Zone Total Cooling Energy" changes with OA flow rate Hello everyone, I am using the

2020-10-19 11:42:20 -0600 asked a question Why the value of "Zone Ideal Loads Zone Total Cooling Energy" changes with OA flow rate

Why the value of "Zone Ideal Loads Zone Total Cooling Energy" changes with OA flow rate Hello everyone, I am using the

2020-09-29 07:09:33 -0600 asked a question problem of querying the data from the SQLFile using Openstudio measure

problem of querying the data from the SQLFile using Openstudio measure We can get values from sqlfile by the command: "s

2020-09-09 06:10:21 -0600 commented question Why the zone air temperature is constant

Hi, Shorowit, The thermostat differential is not so important for the energy consumption, but i want to make the simula

2020-09-07 20:32:42 -0600 asked a question Why the zone air temperature is constant

Why the zone air temperature is constant Hello my friends, i have created a buidling model equipped with a VRF system. T

2020-09-04 07:50:32 -0600 asked a question where can i get a data library of the cooling towers

where can i get a data library of the cooling towers Hi friends, I am creating a chilled water system in Openstudio wher

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2020-07-30 06:43:54 -0600 answered a question an issue on using the Openstudio "Add Interval Schedule From File" measure

The problem was solved. In the first time, i run the simulation after i made the setting of the measure without clicking

2020-07-30 02:53:04 -0600 asked a question an issue on using the Openstudio "Add Interval Schedule From File" measure

an issue on using the Openstudio "Add Interval Schedule From File" measure Hello my friends: I have a issue on using the

2020-07-13 20:55:35 -0600 answered a question How to model two VRF systems connected in Parallel in Openstudio?

Please see this figure for reference.

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2020-07-13 20:54:11 -0600 commented answer How to model two VRF systems connected in Parallel in Openstudio?

Thank you Shorowit for your reply. It is a good idea to use the ZoneHVAC:EquipmentList to specify how the equipment beha

2020-07-11 23:22:05 -0600 asked a question How to model two VRF systems connected in Parallel in Openstudio?

How to model two VRF systems connected in Parallel in Openstudio? Hello My Friends, I want to use Openstudio to model t

2018-05-30 06:28:39 -0600 edited question where is the mathematical model of Dehumidifier:Desiccant:NoFans

where is the mathematical model of Dehumidifier:Desiccant:NoFans Hello everyone, i have some difficulty to find the math

2018-05-30 06:27:55 -0600 asked a question where is the mathematical model of Dehumidifier:Desiccant:NoFans

where is the mathematical model of Dehumidifier:Desiccant:NoFans Hello everyone, i have some difficulty to find the math

2018-01-11 05:58:17 -0600 answered a question OpenStudio Fails to Import Energyplus Model

Usually, the idf generated from openstudio can work in energy plus without any issues´╝îhowever if you import the idf to o

2018-01-10 22:08:56 -0600 edited question BCVTB coupling error with matlab and Energyplus

BCVTB coupling error with matlab and Energyplus Hello everyone, I am trying to carryout a co-simulation of energyplus an

2018-01-10 22:03:46 -0600 edited question BCVTB coupling error with matlab and Energyplus

BCVTB coupling error with matlab and Energyplus Hello everyone, I am trying to carryout a co-simulation of energyplus an

2018-01-10 21:31:49 -0600 commented question BCVTB coupling error with matlab and Energyplus

Thanks a lot, Thierry. The initial problem i had in this question has been solved, but now i get a new question. i just

2018-01-09 07:36:30 -0600 edited question BCVTB coupling error with matlab and Energyplus

BCVTB coupling error with matlab and Energyplus Hello everyone, I am trying to carryout a co-simulation of energyplus an

2018-01-09 07:32:12 -0600 asked a question BCVTB coupling error with matlab and Energyplus

BCVTB coupling error with matlab and Energyplus Hello everyone, I am trying to carry out co-simulation of energyplus and

2018-01-08 17:28:03 -0600 marked best answer Does BCVTB support Energyplus Version 8.8

Hello everyone, I want to know if the least version of BCVTB (version 1.6) support the co-simulation with Energyplus 8.8. From the manual of BCVTB 1.6, it states that the BCVTB is tested with energuplus 8.5 or lower versions and all the examples files of BCVTB use the Energyplus 8.5 or lower versions. I have tried to upgrade one of the idf file of version 8.5 in the BCVTB example to version 8.8. After the upgrade, the co-simulation does not work. I am not sure this is due to BCVTB does not support Eplus 8.8 or somethong went wrong with my seting. Can any experienced person can confirm if BCVTB works with Energyplus 8.8? I will be grateful if someone can give me comments.

2018-01-08 17:27:54 -0600 commented answer Does BCVTB support Energyplus Version 8.8

Thanks a lot, Thierry. The problem i had has been solved. After the version transition, it didnot work at the first run.

2018-01-08 06:07:26 -0600 edited question Does BCVTB support Energyplus Version 8.8

Does BCVTB support Energyplus Version 8.8 Hello everyone, I want to know if the least version of BCVTB (version 1.6) sup

2018-01-08 06:05:17 -0600 asked a question Does BCVTB support Energyplus Version 8.8

Does BCVTB support Energyplus Version 8.8 Hello everyone, I want to know if the least version of BCVTB (version 1.6) sup

2018-01-07 21:15:51 -0600 commented answer Errors caused by different versions of energyplus

Thanks for you answer, Anna. Your answer correctly solves my problems. It seems that we can upgrade the version of idf t

2018-01-07 21:13:01 -0600 marked best answer Errors caused by different versions of energyplus

Hello, i have an .idf file using energyplus version of 8.5. However, currently the energyplys 8.8 is installed in my computer. So how can i use my energyplys of version 8.8 run the idf of version 8.5 successfully without downloading and installing the energyplus 8.5. i will be grateful if someone can give me any comments.

2018-01-07 19:12:18 -0600 asked a question Errors caused by different versions of energyplus

Errors caused by different versions of energyplus Hello, i have an .idf file using energyplus version of 8.5. However, c

2018-01-02 08:18:15 -0600 marked best answer How to set a node air temperature from outside as constant

I am running the energyplus example file which is named as 'DesiccantCVRh'. I draw the system diagram in the power point as shown below. In the original model, the Outside Air Inlet Node 1 is outside air node and the temperature of the inlet air is the time varying outdoor ambient temperature based on the weather file. My question is if i want to make the temperature of Outside Air Inlet Node 1 as constant like 50 degree, 70 degree....during the whole simulation, how can i do it? What objects i need to add?

image description

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