did anyone make one yet? i did and tbh i don't know what to do with it. Well you can stack 10 food stacks in it (so another 10 spots free space that is, not inventory space).
and you can make ice cream, ice pack (seems like a dispell for fire attacks during battle), and ice/icebrick (accessory).

the ice cream is troublesome to make (pure water and grape juice for example), but it is not good at all ... so i wonder why should we make ice, compounding perhaps? or something else that i can't find?

icebrick is needed in south pole quest xD Besides fridge looks cool in kitchen :P

does fridge slots stacks with food shelves?

Yes, the fridge slots are separate from the food display, the wardrobes and cabinets, and the egg machine.

I have not tried making multiple fridges or food displays. Has anyone else?

No still working on the first fridge -.-

But I'll probably make a second food shelf and see if it stacks with other food shelves.

I have two food shelves with 4 different items in them. Besides the max of all the rest of the storage methods like 6 Egg Machines and 5 Cabinets.
Does the fact that I have 2 independant Food Shelves answer your "stacking" question? I am making more of these shelves and working on the "Fridge". I will let you know the limit on those shelves when I reach it...

The refrigeratory - look and you see that it takes juices and basically gives you x3 of them. So essentially you end up with something that is three times better than just the juice.

You can compound sea water with something useless for a chance to get pure water instead of using 4 sea waters to manufacture 1 pure water.

You guys should try and compound the one or other of the ice creams with something. Then you will see what it is good for.^^