IdealAir Heating and Cooling Energy Use at the Same Time?

asked 2018-08-15 19:37:47 -0600

Ed May
113 ●4

updated 2020-01-25 18:17:52 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

Hi all,

I have a question I'm trying to understand about IdealAir loads results and wondering if anyone can clarify for me or point me towards the right reference document? I am looking at the output results for a singe zone model (NYC climate, commercial occupancy) and currently I'm just modeling IdealAir loads. When I look closely at the results "IDEAL LOADS AIR SYSTEM:Zone Ideal Loads Supply Air Total Heating Energy (Hourly)" or the cooling, I find some periods where its showing both heating energy AND cooling energy use at the same time?

For instance, during a shoulder season week: image description

image description

I'm just trying to understand what this 'means' in the case of a single zone model? I would have though it would be either heating OR cooling during any 1-hour period? These overlaps seem to occur reasonably often in my results here. Appreciate any clarification on this.

Thanks very much! -Ed

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answered 2018-08-16 11:26:45 -0600

ericringold

10637 ●32 ●8 https://www.nrel.gov/b...

Change your output variable Reporting Frequency to "detailed" to see the output at each calculation step, instead of aggregated hourly.

See also: this answer and this answer.

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answered 2018-08-16 16:39:35 -0600

Ed May
113 ●4

Hello Eric, Thank so much for your response.

I changed my reporting to 'detailed' as you suggested and I'm not getting 10-minute intervals but still seeing a similar 'overlap' in the results even at that level of detail: image description

is it just that I'd need to go even finer grained time-step to see this overlap disappear or is there some other effect that might be causing such a thing to occur?

Everything seems to simulate fine - just trying to understand what is going on with it.

thanks! -Ed