Sensible Heat Gain Summary Hourly

asked 2023-09-15 03:03:22 -0500

DPalma's avatar

updated 2023-09-15 09:27:20 -0500

Hi All,

I'm conducting a study on the heating and cooling demand of a building, and I'm using the "sensible heat gain summary" report for it.

My issue is that I need to obtain the values from the "HVAC Zone Eq & Other Sensible Air Heating (W)"column for the entire year. I've been looking at the input/output reference document, but it seems like the variables are outdated, and I can't find the variables I should use in the "output:variable" section to get the same value from this column for each hour of the year.

(I'm using HVACTemplate:Zone:IdealLoadsAirSystem)

EDIT: I am using the "Zone ideal Loads Zone Sensible Heating Rate" output which gives me a maximum value of 4kW compared to the 23kW that appears in "sensible heat gain summary"

Thanks for your attention.

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Which variables in the Input/Output Reference seem outdated? I'm looking at the documentation and all of those output variables appear correct to me.

shorowit's avatar shorowit  ( 2023-09-15 09:55:09 -0500 )edit

To be clear, I'm looking at the output variables listed here.

shorowit's avatar shorowit  ( 2023-09-15 09:55:50 -0500 )edit

Hi showowit,

Thank you for your response.

I'm going to provide some more context: I need to demonstrate with my energy model that there is no heating demand. To verify this value, I am using the "Peak Heating Sensible Heat Gain" table. In this table, it states that I need 23 kW of heating in the column "HVAC Zone Eq % Other Sensible Air Heating" for October 20th at 00:00. I want to determine how many hours per year there is a heating demand and the value for each of these hours.

DPalma's avatar DPalma  ( 2023-09-15 13:30:16 -0500 )edit

To do this, I am using the output:variable "Zone Ideal Loads Zone Sensible Heating Rate." The maximum value for the entire year is 4 kW. So, I need to understand which outputs EnergyPlus (EP) uses in the "Peak Heating Sensible Heat Gain" table to show 23 kW instead of 4 kW.

According to the I/O documentation, I understand that the columns are composed of:

  • HVAC Sensible Air Heating: - Zone Air Heat Balance System Air Transfer Rate - Zone Air Heat Balance System Convective Heat Gain Rate

If I add these two outputs, the sensible load is 4 kW

DPalma's avatar DPalma  ( 2023-09-15 13:33:16 -0500 )edit

However, in the table, it shows 23 kW. So, I suspect that I also need to use the outputs indicated in the documentation for:

  • HVAC Input Heated Surface Heating: - Zone Radiant HVAC Heating Energy - Zone Ventilated Slab Radiant Heating Energy

These outputs do not appear in my RDD file, so I'm not sure if they are currently named differently.

DPalma's avatar DPalma  ( 2023-09-15 13:34:41 -0500 )edit