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Additional HPWH inputs #361

Merged
merged 5 commits into from
Feb 13, 2023
Merged

Additional HPWH inputs #361

merged 5 commits into from
Feb 13, 2023

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shorowit
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@shorowit shorowit commented Dec 28, 2022

1. Type

Adds "split heat pump water heater" choice to WaterHeaterType. Adds documentation to WaterHeaterType: The generic "heat pump water heater" enumeration is assumed to refer to an integrated (not split) heat pump water heater.

2. Operating Mode

New HPWHOperatingMode element with choices of:

  • hybrid/auto
  • heat pump only
  • electric heater only
  • high demand/recovery
  • other

Closes #313.

3. Capacities

Allows/documents how to separately describe the heat pump capacity and the electric resistance capacity for a heat pump water heater.

  • Existing HeatingCapacity element: [Btuh] For a heat pump water heater, the capacity of the heat pump.
  • New BackupHeatingCapacity element: [Btuh] The capacity of the electric resistance heating in a heat pump water heater.

…ric resistance capacity for a heat pump water heater.
@shorowit shorowit added this to the v4.0 milestone Dec 28, 2022
@shorowit shorowit self-assigned this Dec 28, 2022
@shorowit shorowit changed the title HPWH capacities Additional HPWH elements Dec 28, 2022
@shorowit shorowit changed the title Additional HPWH elements Additional HPWH inputs Jan 9, 2023
@shorowit
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shorowit commented Jan 10, 2023

  • Keep "heat pump water heater" and add "split heat pump water heater"; document it.
  • "high demand" -> "high demand/recovery"
  • FUTURE: Refrigerant type (could also apply to heat pumps and air conditioners) Refrigerant type #362
  • FUTURE: Ducting inputs HPWH ducting #363

@shorowit shorowit added the merge label Jan 10, 2023
@nmerket
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nmerket commented Jan 13, 2023

@GamalielL
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I'd vote for adding a ducting element now. It should be pretty simple and it has a significant energy impact.

I think the refrigerant is also important, but makes more sense to put off to another version. We are building a model for Thermal Energy Storage integrated with heat pumps. The engineer working on that model reports that refrigerant selection has a surprising large impact on performance.

@nmerket nmerket merged commit b8d6633 into master Feb 13, 2023
@nmerket nmerket deleted the hpwh_capacities branch February 13, 2023 20:27
@shorowit shorowit mentioned this pull request Jun 29, 2023
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Create an operating mode element for HPWHs
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