Carrier HAP Hybrid Heat Pumps

[keithcm]

Hello,

I'm working on an energy model for a building that utilizes "Bulldog Heat Pumps"

https://bulldogheatpump.com/bulldog-operation/

In HAP when you select systems the default water source heat pump system uses a compressor on the water loop to handle the heating and cooling.
The Bulldog unit will use the compressor during the cooling mode, but the compressor shuts off for heating mode and it uses hydronic heating coils within the unit.

Has anyone ever modeled this product or a similar situation?

 

[GT-EGR]

I’m not familiar with HAP, but I would think you can just model it as a water cooled AC cooling only unit and then model a separate unit with hot water coil for the heating.

Unless there is some specialty heat recovery that you didn’t seem to mention.

 

[Drazen]

The kind of company I always fight with, and avoid whenever I can.

I opened several pdf brochures, as the operating explanation carries little sense to me, to find out lot of bulldog pictures, few product photos, and not a single schematic diagram, and not any, even the most basic, specification.

If I understood well, they use water-cooled micro-chiller for cooling, while having additional heating coil that uses primary loop fluid. (Why do they call it heat pump if it does not heat?)

Maybe that makes some sense in Canada, where extremely low winter temperatures discourage usage of heat pumps for heating. It is mysterious, though, why they don't use the same primary loop for cooling and get rid of local coolers completely.

In HAP, you use systems. Make one system for cooling, with heat pumps, the other system for heating, so called terminal system with 2-pipe fan coil. And that's it.