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# How are the Process Subtotal (\$) and Total Energy Cost (\$) calculated in the Utility Bills/Rates section of Open Studio Results.

I am investigating the affects of precooling and thermal energy storage on a couple of different building models. I have implemented a time of use utility tariff structure using a measure. I would expect to see cost savings for both precooling and TES but when I run the simulations against my baseline case I get a greater Total Energy Cost vs my baseline case. However, I get a lower Process Subtotal for both precooling and TES when compared to the baseline case. Any insight into how both of these outputs are calculated are greatly appreciated.

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It comes from the LEED Summary section of the EnergyPlus tabular results in the 'EAp2-3. Energy Type Summary' table. What we call 'Average' Rate is called 'Virtual Rate' in the EnergyPlus results.

The Tariff Report section of the EnergyPlus tabular results will provide you more detail on each tariff type with breakdown of Energy, Demand, Service, Taxes, etc.

Might take some time to track down how the 'Virtual Rate' is calculated, didn't find it in quick search.

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The virtual rate is just the total cost for electricity divided by the total kWh, which gives you \$/kWh that includes all of the charges in the utility rate structure. It is the same for gas.

( 2017-04-05 15:00:06 -0500 )edit