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Turning on and off plant components using outdoor ambient temperature

asked 2022-03-09 09:33:16 -0500

TigerMoley's avatar

updated 2022-03-09 11:46:53 -0500

Hi all,

I am trying to model a hybrid heat pump system in EnergyPlus 9.2, a hybrid heat pump system is essentially an air to water source heat pump that works with a gas condensing boiler used for space heating and domestic heating water. Its operation can vary between heat pump mode, hybrid mode (heat pump and boiler) and boiler only mode depending on the outdoor ambient temperature.

The figure below shows how I have the boiler and heat pump in the SVG within the space heating loop

image description

I was wondering would anyone know how I could turn on and off the boiler and the heat pump depending on the outdoor ambient temperatures to model the hybrid heat pump systems.

For above 3 degrees Celsius I would like heat pump only mode, between 3 and -2 degrees celsius I would like hybrid mode (boiler and heat pump satisfying the heating load) and for below -2 degrees I would like boiler only mode.

I was hoping to use the class PlantEquipmentOperation:OutdoorDryBulb but I think this only works for condenser equipment.

I would really appreciate any advice you all would have on this.



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answered 2022-03-09 15:03:28 -0500

You will likely need to use an EnergyManagementSystem:Program to achieve your desired control. A similar plant control scheme based on OAT is demonstrated in the example file: EMSPlantLoopOverrideControl.idf (C:\EnergyPlusV9-2-0\ExampleFiles). Also refer to the EMSApplicationGuide.pdf documentation for more information on creating EMS programs.

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Asked: 2022-03-09 09:33:16 -0500

Seen: 185 times

Last updated: Mar 09 '22