Water Usage from Well/Storage Tank

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UPDATE 1

~~You don't necessarily specify the inlet water temperature to the water heater directly~~

You can specify the cold water supply temperature as a schedule for the WaterHeater:Mixed object in the OpenStudio application. See an example of doing that in this Unmet Hours post.

You can also specify the mains water temperature that "replaces" the water going down the drain as part of the WaterUse:Connections object. You can see a diagram of this in the EnergyPlus documentation.

In your case, you want to set the mains water temperature as the desired well water temperature. It's easiest to do this by creating a schedule of the well water temperatures in Celsius, then referencing that schedule for the water system to replenish with. There are multiple ways to do this second step (less effort at the top of the following list):

• Site:WaterMainsTemperature object, which would be a "universal" setting for where ever cold makeup water is used to replace water that has gone down the drain or refilled a water heater or storage tank (set Calculation Method input field to "Schedule", then reference the well water temperature schedule in the following Schedule Name input field). Using the OpenStudio Application, this must be done through a measure such as in this Unmet Hours post.
• Cold Water Supply Temperature Schedule Name input field of the WaterUse:Connections object(s)
• Cold Water Supply Temperature Schedule Name input field of the WaterUse:Equipment object(s)

You can read more about the nuances of mains water inlet temperatures within plant loops (water systems) in an Unmet Hours post.

UPDATE 2

If you want to also account for the pump energy of the well water system, you cannot model that directly since EnergyPlus doesn't allow a plant loop connecting well water to storage tank in the same way your "Service Water Loop" connects the water heater to the water draws. As such, you have two alternatives:

1. Do a manual calculation after the simulation using results for flow rate of well water used each hour or something similar
2. Use the EnergyPlus Management System (EMS) feature of EnergyPlus to "embed" such calculations within the model