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Modelling Exhaust Air Heat Pump

Hello All,

I am new to Design builder. I am trying to model an Exhaust Air Heat pump (EAHP) within Design builder. As I understand, the EAHP takes the sucks in the heated air that entered the zone through the windows/openings n each zone. Then the heat from the sucked air is exchanged and is used to heat the water, that in the end is used for radiator heating/floor heating in each zone.

For air from outdoor into the zone, I have "Natural Ventilation" checked ON in each zone. I am using 5 AC/H in each zone. Also, in each zone (under the Detailed HVAC system), I have added an extract fan to extract the air to the Heat pump. In order to model EAHP, I used ASHP from the design builder. But the model only takes air from the outdoor, not from the zone (shown in the attached picture) image description

How do I model the Exhaust Air Heat Pump in Designbuilder?

Tanay's avatar
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Tanay
asked 2019-11-18 03:54:24 -0500
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The heat pump in the image was designed to work only with fresh air. The red line doesn't make any sense to Design Builder because the Exhaust must be connected to an AHU, not to a heat pump - this is why you can't connect them.

What you want might work with an API that uses a script - it involves some coding. You can force Energy Plus to use the room data (temperature, humidity etc.) instead of the weather file.

banicu's avatar
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banicu
answered 2019-11-21 03:20:35 -0500
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I find that even in the AHU in Design-Builder, I cannot just have an Exhaust only system on-site level and there anyways I don't know how to attach a Heat pump with AHU.

I know how to use EnergyManagementSystem (EMS) APIs for Energy Plus. I also know how to use Eppy (Python). But in both the case I do need to know which EMS actuator/sensor I have to use. This is I am missing.

Do you know how can I model the Exhaust Air Heat Pump using EMS or Eppy?

Tanay's avatar Tanay (2019-11-21 04:22:20 -0500) edit
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