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NREL / OpenStudio

OpenStudio is a cross-platform collection of software tools to support whole building energy modeling using EnergyPlus and advanced daylight analysis using Radiance.
https://www.openstudio.net/
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Air-cooled Central Heat Pump System #4956

Closed annajmorton closed 1 year ago

annajmorton commented 1 year ago

Enhancement Request

Air-cooled heat recovery chillers are used to make chilled water and hot water and share heat between the two systems. With a push towards electrification, these types of systems are becoming more common. Our firm has also designed several of these systems for indoor grow facilities. There does not seem to be a simple way to model this type of system using the SDK.

Detailed Description

The existing OpenStudio::Model::CentralHeatPumpSystemModuleCentralHeatPumpSystemModule class seems like it could be used, but it is only available as a water-cooled system. It seems like this might also be a limitation with EnergyPlus? Though I do not use EnergyPlus much directly, so maybe there is an easy way to make it air-cooled in the editor.

I looked at using the create_central_air_source_heat_pump(model, hot_water_loop) from the openstudio standards library with a air-cooled chiller, but this combination does not account for energy recovery between the hot and chilled water loops which is significant in some building (e.g. indoor grow facilities). the create_central_air_source_heat_pump(model, hot_water_loop) function uses this class - OpenStudio::Model::PlantComponentUserDefined

Possible Implementation

Could this OpenStudio::Model::CentralHeatPumpSystemModuleCentralHeatPumpSystemModule class be modified to allow for air-cooled systems?

jmarrec commented 1 year ago

CentralHeatPumpSystem is a water one, as this is how EnergyPlus meant it.

CoilSystemIntegratedHeatPumpAirSource is what you are after I think. There is an example of the API here: https://github.com/NREL/OpenStudio-resources/blob/develop/model/simulationtests/coilsystem_integrated_heatpump.rb It is a complicated object to work with.

jmarrec commented 1 year ago

I/O reference guide: https://bigladdersoftware.com/epx/docs/23-1/input-output-reference/group-heating-and-cooling-coils.html#ASIHPIO