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Cooling Loads not showing up under "Results Summary Section"

asked 2023-07-20 13:12:21 -0500

vgmvp02's avatar

updated 2023-07-20 14:20:06 -0500

I have tried to make my first fairly advanced OpenStudio model. However, even though the simulation runs with no "errors", the cooling loads do not show up under "HVAC Load Profiles". I will upload photos of all my loops below. In addition to this, in my .eio file, the Cooling Coil Capacity for all 4 of my coils are 0. I do not know why this is the case, perhaps because my unit ventilator constant cooling has "Coil:Cooling:Water" data all autosized? I've been working on trying to fix this issue for a week now, and any help would be appreciated.

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Okay for some reason the images aren't allowed to be uploaded because I don't have enough "Karma", so i have attached them to a google drive link:

vgmvp02's avatar vgmvp02  ( 2023-07-20 13:15:32 -0500 )edit

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answered 2023-07-21 05:54:29 -0500

Petros Dalavouras's avatar

I took a look at you screenshots and there are many things wrong with them. Firstly, you have a plant loop that has in the supply side a boiler before the cooling tower and the demand side has hydronic cooling coils. Since your cooling coils do not have any nodes above and below they can only be connected with zone equipment or nothing but I can't tell from these screenshots. I am not sure what you were trying to model but cooling towers are supposed to cool water for chillers so both the boiler and the connection with the cooling coils are wrong. In case you were trying to model a strainer cycle this is not the correct way to model it. Lastly, to answer your original question, from what I understand the only thing that conditions your thermal zone is your airloop which does not have a cooling coil (DX or water) and this is probably why you do not have any cooling loads.

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Hello Petros, thank you for your answer. I am trying to model a datacenter in OpenStudio. [] shows a loop with a heating coil and a fan. This is an attempt to model the heat dissipated from a server rack. If you have any suggestions on how to improve that, please let me know. Do cooling loads not show up for water cooling? Considering we have [] 3 Coil:Cooling:Water units that are always on?

Thanks again.

vgmvp02's avatar vgmvp02  ( 2023-07-24 13:49:26 -0500 )edit

Air loops are used in order to condition thermal zones. You should use the internal loads found in "loads" tab in order to simulate the heat from the racks. E.g. Electric Equipment Definition. Are these water coils a part of something? But even if they are, your loop is not correct. I would suggest seeing the HVAC templates first in order to understand better how to model your loops

Petros Dalavouras's avatar Petros Dalavouras  ( 2023-07-25 11:34:48 -0500 )edit

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Asked: 2023-07-20 13:12:21 -0500

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Last updated: Jul 21 '23