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What EnergyPlus report to use for coil sizing selections?

asked 2016-06-30 14:02:53 -0500

updated 2016-10-20 19:38:43 -0500

I need to run loads in OpenStudio 1.11 to size equipment for a commercial 5 story office building. Where in the output reports can I find the following information?

system total cooling coil capacity (MBtu/h);

system total heating coil capacity (MBtu/h);

system design air flow rate (cfm);

outside air flow rate (cfm);

The building will run on district chilled water and have several systems with chilled water fan coils, electric heat, and parellel fan powered boxes. There is also a dedicated outside air system that I need to account for that will deliver neutral air to the air handlers. I am running one zone per system. Here is a screen shot of one of my systems. image description

I have looked in the E+ output report under "Equipment Summary" and "HVAC Sizing Summary" but have found the design loads and nominal total capacities give conflicting information. I understand the coils show design loads with fan and electric power, the nominal capacity does not have fans nor electric power, and the zone sensible is sensible without system effects nor ventilation loads. My "Cooling Coil Nominal Sensible Capacities" are almost double my "Sensible User Design Cooling Loads".

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Have you looked at the "Component Sizing Summary" in the E+ output report?

aparker's avatar aparker  ( 2016-07-01 16:05:37 -0500 )edit

That is where I am looking, too. It appears to have all the necessary information, but - at least under my configuration - it shows it in W and m3/s. Is there a way to quickly and easily get kBTU/h, ton, cfm and gpm from those? Alternatively, can the Component Sizing Summary be exported to a spreadsheet? Thanks.

Matt Koch's avatar Matt Koch  ( 2016-07-05 06:59:52 -0500 )edit

@Matt Koch You could write a reporting Measure that unit converts and saves to CSV or you could open the report in a web browser and copy/paste the table to Excel.

aparker's avatar aparker  ( 2016-07-05 12:48:14 -0500 )edit

@Matt Koch the Set Output Table to IP units measure might help. However, it does interact with the standard OpenStudio report.

MatthewSteen's avatar MatthewSteen  ( 2016-08-03 20:13:44 -0500 )edit

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answered 2016-07-06 13:05:27 -0500

Check out the "Component Sizing Summary" in the E+ html report.

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Thanks @aparker, that's what I was looking for. For the water cooling coils, I believe the column I want is design coil load, and not nominal capacity that is under Equipment Summary. Now I just have to figure out why my loads are so oversized at under 300 ft²/ton when I have a dedicated outdoor air system providing neutral air.

kramerica's avatar kramerica  ( 2016-07-06 15:06:19 -0500 )edit

I would be hesitant to use the Component Sizing Summary for DX coil sizing. The Design Size Gross Rated Total Cooling Capacity appears to be the rated capacity vs. the design capacity as reported for hydronic coils.

MatthewSteen's avatar MatthewSteen  ( 2016-08-03 20:33:18 -0500 )edit

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Asked: 2016-06-30 14:02:53 -0500

Seen: 716 times

Last updated: Jul 06 '16