twin commercial heatpump system.

[Alistair_Heaton]

I am putting a panasonic heatpump system PAci elite into a workshop.

The installation specs are these

Now I want it to do two floors so in cooling mode the top floor gets cooled and in heat the ground floor gets heated both at the same time.

They have 10 meters of pipe for a branch and 0.5 meters elevation rise as a limit. And its limits are for max 9.58mm and 15.88 pipe.

What will be giving those limits?

I am thinking its a pressure difference on the none return valves in the indoor units.

And the limit is due mass of fluid in lines.

Flow diagram

How stupid would be reducing the branches to 6.35mm and 9.52mm after the twin manifold instead of using reducers on the indoor units, which would halve the fluid load (hopefully giving 1 meter elevation) and then limiting the branch length to 2.5 meters to give me 2.5 meters elevation?

If my logic is wrong I can just put both indoor units in on the ground floor so not a problem but would like to get both floors if possible with cooling. Heating convection will heat the top floor.

Its a 15m by 6 m workshop vehicles on ground with second floor for workbenchs.

 

[MintJulep]

Do not change the diameters. Velocity will go up, pressure drop will go way up. Things won't work well.

I think that if you don't obey the allowed height difference between the two indoor units then the lower unit will be favored when both are operating. Either one alone will probably work ok.

 

[Alistair_Heaton]

H'mm good point with the velocity pressure drop.

Maybe small cross section on the bottom and large going to the upper.

The indoor units need a coupling to the big pipe anyway. Maybe have to start looking for gauges and restrictor valves so I can tune it.

 

[Alistair_Heaton]

Right after some thinking.. after you excellent advice.

I can get a PACi NX Series Elite adaptive ducted unit Inverter+ • R32 which can be mounted horizontally or vertically and has various configuration options for air processing directions.

I can just make up a mounting box for it using 50mm aerated elements and then duct the air to where I want it. And as the ceiling panels are 225mm thick that should get me to under 500mm vertical separation.

Thank you for making me think...