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I have a very simple single zone model served by a heating only constant volume system. There is no outdoor air and the fan pressure drop is zeroed out to reduce fan heat influence.

I run the model with zone sizing of 85 F heating supply and then with zone sizing of 95 F. I anticipated the heating results to be identical as the only impact this would have would be on the fan volume and fan power. However we see a 7% change in the heating energy. Could someone hint what could be causing this.

I energyplus V8.5 idf files I used: C:\fakepath\85.idf.jpg C:\fakepath\95.idf.jpg

Here are the HTML output files: C:\fakepath\85Table.html.jpg C:\fakepath\95Table.html.jpg

I have a very simple single zone model served by a heating only constant volume system. There is no outdoor air and the fan pressure drop is zeroed out to reduce fan heat influence.

I run the model with zone sizing of 85 F heating supply and then with zone sizing of 95 F. I anticipated the heating results to be identical as the only impact this would have would be on the fan volume and fan power. However we see a 7% change in the heating energy. Could someone hint what could be causing this.

I energyplus V8.5 idf files I used: C:\fakepath\85.idf.jpg C:\fakepath\95.idf.jpg

Here are the HTML output files: C:\fakepath\85Table.html.jpg C:\fakepath\95Table.html.jpg

I have a very simple single zone model served by a heating only constant volume system. There is no outdoor air and the fan pressure drop is zeroed out to reduce fan heat influence.

I run the model with zone sizing of 85 F heating supply and then with zone sizing of 95 F. I anticipated the heating results to be identical as the only impact this would have would be on the fan volume and fan power. However we see a 7% change in the heating energy. Could someone hint what could be causing this.

I energyplus V8.5 idf files I used: C:\fakepath\85.idf.jpg C:\fakepath\95.idf.jpg

Here are the HTML output files: C:\fakepath\85Table.html.jpg C:\fakepath\95Table.html.jpg

I have a very simple single zone model served by a heating only constant volume system. There is no outdoor air and the fan pressure drop is zeroed out to reduce fan heat influence.

I run the model with zone sizing of 85 F heating supply and then with zone sizing of 95 F. I anticipated the heating results to be identical as the only impact this would have would be on the fan volume and fan power. However we see a 7% change in the heating energy. Could someone hint what could be causing this.

I energyplus V8.5 idf files I used: C:\fakepath\85.idf.jpg C:\fakepath\95.idf.jpg

Here are the HTML output files: C:\fakepath\85Table.html.jpg C:\fakepath\95Table.html.jpg

I have a very simple single zone model served by a heating only constant volume system. There is no outdoor air and the fan pressure drop is zeroed out to reduce fan heat influence.

I run the model with zone sizing of 85 F heating supply and then with zone sizing of 95 F. I anticipated the heating results to be identical as the only impact this would have would be on the fan volume and fan power. However we see a 7% change in the heating energy. Could someone hint what could be causing this.

I energyplus V8.5 idf files I used: C:\fakepath\85.idf.jpg C:\fakepath\95.idf.jpg

Here are the HTML output files: C:\fakepath\85Table.html.jpg C:\fakepath\95Table.html.jpg

I have a very simple single zone model served by a heating only constant volume system. There is no outdoor air and the fan pressure drop is zeroed out to reduce fan heat influence.

I run the model with zone sizing of 85 F heating supply and then with zone sizing of 95 F. I anticipated the heating results to be identical as the only impact this would have would be on the fan volume and fan power. However we see a 7% change in the heating energy. Could someone hint what could be causing this.

I energyplus V8.5 idf files I used: C:\fakepath\85.idf.jpg C:\fakepath\95.idf.jpg

Here are the HTML output files: C:\fakepath\85Table.html.jpg C:\fakepath\95Table.html.jpg