commerical hvac system?

Brent_2

i was at a wegman's and they brought the returns down to the back of the cases.

brent

clammy

commerical a/c refregeration ?

While on vacation in florida i was in a grocery store store and noticed on the frezzer and reach in cases a/c supply ducts where ran and termitted behind the cases all the unit which had these whereequipted with out door condensers ?I had given it some thoiughts and could only come up with it lessening thwe loads on the cases by limiting the amount or temp of the incoming air when the cases where open just curious and wondered if some one can open my though process more .By the way the reurns for these systems where up in the cieling open and all the duct work was round spril duct thanks and peace clammy

JimGPE_3

Wow!

Sounds like someone wasn't thinking.

I've always believed the return air should come from down low in the door/reach-in case area so you could catch all the "free" cooling that came out. Cannot imagine why they would supply behind the cases.

That's a mystery, all right.

Rookie_3

That apllication is called "Cold Plate" and would be a Pump Down system. Evap. coil has a 25* temp. drop vs. the 15* Temp. drop that you would find on a force fan that you are use to seeing. They are set up for that continuous use that a super market gets. The return on the ceiling you are seeing is probably from the stores central air system.
ROOKIE

clammy

sorry rookie

The frezzer cases where fan driven and it wasn,t the returns going to behind the cases which where back to back it was the supplies which went to the open refrigerator reach in and the hinged door frezzers .The open cases where with plate evaps while the frezzer where fan evaps the only thoughts i had where to lessen the incomiung temp when the frezzer door where open all the units had remote outdoor condensers so i would only guess would be to reduce incoming air store temp and reduce window fogging and short cycling of compressor .I,ve never seen this type of set up and it sparked my interest of what kind of overall ideas or sound resoning was using it also could be a way to reduce the dew point temp on the outside and stop some complaints of people feeling cold down the frezzer isles cause you know there's alot of retired in fla .Thanks for your thoughts i'll be talking to a buddy who always on the cutting edge of new system desing and energy recovery systems and see what his thoughts are thanks for the thoughts peace clammy

Rookie_3

Clammy

Sounds like a typical store set up. Outdoor condensers for comercial freezers are pretty common also. Around here(Northeastern MA) any outdoor unit could be more of a problem because of the low winter temps that the freon doesn't want to move in without ORI-ORD set up or fan cycling or even louvours. Heatpumps are popping up every
place also and they should be kept in places like Florida to take the chill off on a cool morning, not as a primary heat source......ROOKIE

David_5

Supplies behind cases

I've never heard of that either. This sounds like a poor idea to me. Supply air in the a/c mode has a high RH. I would think this setup would be likely to have condensation problems on the cases unless the humidity was pretty low in the store. I doubt there is low humidity in a Florida store. Returns behind / under cases make more sense to me.

David