How to model PTHP and ERV as a single zone equipment

Hello @MingboPeng
PTHP and ERV as zone equipment.gh (357.1 KB)

I have a PTHP and ERV as a zone equipment for a single thermal zone, but when I try to model by connecting the PTHP on the equipment in the Thermal zone and ERV as supply side on the AirLoop system, I am not getting the cooling value even for the cooling season. Plus I have also modeled both PTHP and ERV as zone equipment by grouping them together with NoAirLoop system still I am not getting the cooling energy consumption?
I am new to this filed and I want to understand how to model if you have PTHP and ERV ( AirToAir:HeatExchanger) as zone equipment for the single thermal zone, so could you guide as your guidance would be great help?
I have attached the .gh file for both the system that I explained above.

Hi @Ashok, how do you check the cooling valve? Do you get any cooling load without adding the Ironbug system?

Thank you @MingboPeng for reply

I just run the simulation and observe the end use category energy consumption where I obtained heating, interior lighting, equipment and fans energy but there is no cooling energy even for the cooling season.
But if I used the system 16 template without changing anything then I get the cooling values also but with my system I am not getting that value

Hi @Ashok, have you checked each end use category energy consumption from the html report? That’s the raw report generated by EnergyPlus, you probably can get more detailed results there.

Hi @MingboPeng I did check but I did not find any cooling energy demand even for the cooling season, I only find the heating energy demand so could you please see my grasshopper file that I have attached here and provide the guidance as your guidance can help me progress in this matter.

Thank you again for the reply.

Hi @Ashok, I just did a quick test with the sample PTHP system, and I can see cooling value here:


So that leads me to the conclusion that you must have something in your file that turns off the cooling equipment.

I did another quick test by removing your custom availability schedule for the cooling coil in PTHP, and I get the cooling value here as well.

Until here, it’s pretty clear that your custom schedule prevents the cooling coil running.

A better way to test if your schedule is set correctly or not is open the osm file in OpenStudio Application so that you get a visual representation.
Here is my fix of your custom schedule, and a screenshot of it in OpenStudio App, which represents that the equipment will only be turned on from 6/1 to 9/30. I rerun the simulation and get the cooling back with your system.

Hi @MingboPeng
Thank you so much for your guidance! I will adjust the schedule as you suggested and rerun the simulation. Your prompt response is incredibly valuable to me.

Hi @MingboPeng
I am sorry to bother you again but I want to know whether my process of simulation is correct or not because when I assign the program type with different schedule and setpoint again I am not getting the cooling load during the summer months in my model so could you provide some insights on this?

Hi @MingboPeng and @chris
Sorry to bother you again. This type I have made a complete model of a 1 bed apartment considering the whole apartment as a single thermal zone by assigning all the necessary program type and construction equipment. I used the packaged thermal heat pump and ERV as the zone equipment with NoAir Loop.
Till there I thing my model is good but while simulating the model I am getting too high value for the heating season while very less for the cooling season as when I compared this data with the real time data so could you help me to confirm whether my model or the way I am preparing the model is correct or not as I have been doing this for like a month and I am not getting any progress.
I have also attached the .gh file by internalizing the data.
3rdFeb.gh (381.2 KB)
I hope your guidance will motivate me to move forward in this path.
Thank you