Add performance data to OpenStudio Coalition model

asked 2025-11-05 08:16:05 -0600

Dutchie
19 ●1 ●2

updated 2025-11-05 09:08:22 -0600

Aaron Boranian

14460 ●92 ●25 http://bigladdersoftware.com/

Hello guys and girls,

I have a quick question. I have a table of heating capacity (kw) at different outdoor temperature (celcius) with different compressor speeds (hz) of a Air to Water heat pump which feeds hydronic underfloor heating in my model.

How can I use this heat pump data in the latest version of OpenStudio Coalition?

I need your help. I have already tried serveral times (and many spent hours) to write custom measures that manipulated the nominal heating power of existing heating providers (for example a boiler or district heating) but that unfortunately did not work.

Thank you very much!

With kind regards, Dutchie

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answered 2025-11-07 09:51:43 -0600

Denis Bourgeois
3863 ●145 ●8 https://www.rd2.ca

@Dutchie,

This is more of a suggestion than an answer. To figure out if the OpenStudio Application (App) supports a given feature (e.g. VSD heat pumps), it's best to first start from the EnergyPlus object you're interested in, and then make your way up to the App. Developers can correct me, but I'd venture that the SDK supports +95% of available EnergyPlus objects - the App maybe 75%? That's why measures are so useful ...

As an example, maybe you're interested in EnergyPlus' Coil:WaterHeating:AirToWaterHeatPump:VariableSpeed object. This is indeed supported by the SDK (see here and here). Yet it doesn't look like it's supported by the App - I could be wrong. A search for "coil" suggests the App is limited to DX (you can also search for "HP"):

image description

Based on the search results, I'd suggest the best option is indeed an OpenStudio Measure - in this hypothetical example, based on the aforementioned VSD object.

Hope this helps ...

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answered 2025-11-09 05:38:31 -0600

Dutchie
19 ●1 ●2

Thank you Dennis for your interest in my question and your reply.

I have been on a search and I have spent many many hours (days now really) writing Openstudio Measures and Energyplus Measures with AI studio and ChatGPT, but every one of those measures was a deadend in the end.

I'd say after this experience that it is impossible to use your own data sheet of a heat source combined with outdoor temperature in OpenStudio Coalition which is a shame. It is a pretty cool piece of software otherwise considering it is free.

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The problem I am running into is that I seem not be able to manipulate the heating capacity of a Districtheating or HW:Boiler with every timestep through a EMS in OpenStudio. Or there is no actuator to do it, or the flow does not go through my device. In every configuration I try there is something that ruines my idea.

Has anyone succesfully manipulated a heating source's heat injection in a plant loop with every timestep with a measure in Openstudio?

Dutchie ( 2025-11-10 03:41:26 -0600 )edit

@Dutchie - There are multiple ways of doing this. One way would be to use a HeatPump:PlantLoop:EIR:Heating object and override the output of the capacity modifier as function of temperature using an EMS program (you would also have to put care into developing the efficiency inputs, defrost, etc.) but it's doable. EnergyPlus and OpenStudio are pretty complex software, I'm not sure that AI tools such as ChatGPT can be used to build reliable measures at this point.

Jeremy ( 2025-11-14 15:27:02 -0600 )edit

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