Background... A customer of ours owns a bar. He recently has obtained a used walk in cooler that used to belong to a large BBQ restaurant that closed. The cooler is actually in pretty good condition. He will be using it to store his beer kegs, with chilled glycol lines going to them. The box was previously used to quickly cool down hot BBQ ribs and stuff. I don't have any of the btu info, but my boss and the bar owner agree that the refrigeration systems are way over sized for what it will be used for now. It came with 2 separate evaporators and condensing units that were piped and controlled independently.
Here is the deal... We got the box set up in it's new location and were getting ready to run the refrigerant piping to the condensing units which were going to be mounted on a homemade rack about a foot off of the ground in the back of the bldg. Well, someone stole the condensing units over the weekend. Now we need to figure out what to replace them with.
We already have the evaporators hung and partially piped in. The old plan was to keep the 2 independent systems but only run one of them by setting one t-stat around 33* and the other about 10* or so higher, or maybe just by shutting off the disconnect to the unused one. Now the bar owner needs to come up with new condensing units.
My question is... If we run a proper load calc. on the box and come up with a smaller load number, could we pipe the 2 oversized evaporators together and run the piping to one condensing unit that is sized to the new load? Would we just need new expansion valves sized to the new condensing unit, or wouldn't this work?
Any opinions are appreciated. Thanks.