Heat Pump Water Heater in Mechanical Room

Sage_Building_Solutions

I have a project with significant waste heat in a very large mechanical room. I would like to reclaim the heat and am considering a HP water heater for domestics as an option. Are there any systems out there with ducted exhaust?

Brad White

Is the waste heat in the air?

If it is a warm and even humid room otherwise, there is a product, name escapes me. This device is an AC unit/dehumidifier which sits atop the DHW heater and uses the hot gas waste heat from the refrigerant process to pre-heat the DHW incoming cold water. (Rather uses the incoming CW as a water-cooled condensing medium).



If I come across the name I will post it but others I am sure know the one I am talking about.



There also were a line of Free-heaters from Spiro (the spirovent people) and Meuller refrigeration specialties, to take the same hot gas waste heat from commercial refrigeration and use it also to pre-heat incoming CW to DHW systems. We specify the Meuller line on commercial kitchens but I see no reason it cannot be adapted to other AC processes. 



Depending on how hot the room is, a more passive coil situation could be used, but the refrigerant boost is more positive.



How hot IS this room?  It may be as hot as my grandfather used to say: "Hot as a June Bride in a Feather-Bed". Now that, my friend, is hot.

Steve_210

A O smith

Make a unit like what brad mentioned. Just seen it at a show

TMorg

HP water heater

Rheem/ Ruud makes a really nice unit.

Steamhead

I think

it's called a "desuperheater".