'building heat load (coils+losses&gains)'

asked 2020-12-02 07:35:09 -0600

Oscar Yip
43 ●3

updated 2021-03-28 09:39:22 -0600

Hi All, I am having a project that is too large to handle in one single model and adopting a central cooling/heating plants system. Therefore, I decide to build them individually on different model for different area (e.g. Tower 1, Tower 2, etc.). And then put the cooling load and heating load to a model with only cooling and heating plant .

As I am trying to create a HVAC load profile, so I am assuming using the 'building heat load (coils+losses&gains)' and Building cool load (coils+losses&gains) (Btu/hr) from the Building-HVAC are what I needed.

However, the sum of the hourly 'building heat load (coils+losses&gains)' (Btu) doesn't seem to match with the sum of gas consumption (Btu) in the Monthly Energy Consumption by Enduse page. While the gas consumption is slighly higher than the sum of hourly load. What did I missed?

Thanks in advance!

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answered 2020-12-02 09:04:21 -0600

Daniel
648 ●3 ●10 http://www.sustainabil...

It's a little unclear which reports you are using. Are these variables selected in the hourly reporting schedules? I would generally expect the gas consumption to be higher than the load unless the gas-burning equipment is operating with perfect efficiency.

You might want to consider looking into the .SIM file and accessing the PS-C and PS-D reports. The PS-C report will show the plant equipment with the annual heat/cool loads along with their annual fuel/electricity consumption. The PS-D reports will show the circulation loop loads. This will give you a check on the annual sums of the hourly loads and a sense of the annual operating efficiency for the plant equipment. For the hourly loads themselves, I would suggest creating an hourly report for the hot and chilled water loops rather than using the building heat/cool load variables.