Sizing Refrigeration for Cold Room

[MatthewS]

We are building a stick frame cold room in our new brewery.

The space is 24'wide x 54'L x 10'H. If 3rd grade math is my strong suit then I am calling this 12960 cf.

We will keep this room at about 42-45 degrees for keg and bottle storage, and for the beer heading to the tavern up stairs, we will run a small (1/3hp chiller unit) with a trunk line to keep the draft cool and pouring well.

Any help on sizing the condensing units and evaporator coils?

Would this work?
- A Witt 4 hp. scroll Indoor condenser unit (460V/3ph.) with 2 Witt matching evaporator coils (460V/1ph.)

I may need to install the unit outside, any suggestions there?


EDIT.
I meant to add that the interior walls will be sheathed with 1/2" exterior plywood and FRP and the exterior walls will be sheathed with 1/2" ridged insulation and 1/2" plywood. Is 4" total insulation enough?


Thanks
Matthew

[jimvgjr]

Hi Matt,

I have a Cold room load estimate program supplied by a Cold Room Panel Manufacturer- when I plugged in the dimensions it provides a "Low", "Medium", and "High" BTU Loads- I go with the Medium most times and has served well.

Here are results:

Low: 49,000 BTU/HR
Medium: 58,000 BTU/HR
High: 66,000 BTU/HR

These are based on insulated panels with R factors in the +R30 range. I am not sure what the estimated rating of your proposed configuration but am sure the data is available.

Based on the above, It looks like closer to 7.5 HP for the condensing unit.

Because you'll need a contractor to install and charge the system with refrigerant- Id suggest getting bids for the condensing unit and coils from them. We offer glycol coil for cold rooms, but you'll need same the available capacity on your chiller system.

Good luck with your new venture, hope this helps.

Jim

Pro Refrigeration Inc.