| Name | Add_hpwh |
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| Display Name | Add Hpwh For Domestic Hot Water |
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| uuid | 518cde6f-1806-4b9a-bee9-ccaac49c7a53 |
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| Type | Measure |
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| Language | Ruby |
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| Tags | Service Water Heating.Water Heating |
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| Description | This measure adds or replaces existing domestic hot water heater with air source heat pump system and allows for the addition of multiple daily flexible control time windows. The heater/tank system may charge at maximum capacity up to an elevated temperature, or float without any heat addition for a specified timeframe down to a minimum tank temperature. |
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| Modeler's Description | This measure allows selection between three heat pump water heater modeling approaches in EnergyPlus.The user may select between the pumped-condenser or wrapped-condenser objects. They may also elect to use a simplified calculation which does not use the heat pump objects, but instead used an electric resistance heater and approximates the equivalent electrical input that would be required from a heat pump. This expedites simulation at the expense of accuracy.
The flexibility of the system is based on user-defined temperatures and times, which are converted into schedule objects. There are four flexibility options. (1) None: normal operation of the DHW system at a fixed tank temperature setpoint. (2) Charge - Heat Pump: the tank is charged to a maximum temperature using only the heat pump. (3) Charge - Electric: the tank is charged using internal electric resistance heaters to a maximum temperature. (4) Float: all heating elements are turned-off for a user-defined time period unless the tank temperature falls below a minimum value. The heat pump will be prioritized in a low tank temperature event, with the electric resistance heaters serving as back-up. |
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| Measure Type | ModelMeasure |
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| Intended Software Tool | Apply Measure Now |
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| Intended Software Tool | OpenStudio Application |
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| Intended Software Tool | Parametric Analysis Tool |
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| Intended Use Case | Model Articulation |
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| Intended Use Case | New Construction EE |
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| Intended Use Case | Retrofit EE |
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| OpenStudio Version | 3.0.0 |
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| Minimum Compatible OpenStudio Version | 2.8.0 |
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| README File | README.md |
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| GitHub Repo | NREL/openstudio-load-flexibility-measures-gem |
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