Hey, now your using your noodle.
Ok, so I have a Norcold RV fridge, small 18 x 24". Mounted at eye level. Underneath is the microwave that sits on the countertop behind the sink. Under the sink is a sealed compartment with access from outside, the door is vented. I Keep the propane and the pump and the stinky slinky in there. So I made a duct that runs behind the microwave up to the ceiling. Then I put a opening just big enough for the condenser coil of the fridge to fit into the duct. There is a foam seal around the opening that seals the duct to the fridge back outside wall. The condenser is inside the duct. Then I put a vent to the outside at the top of the duct on the outside wall. So now when the condenser throws out heat it is vented to the upper vent,(heat rises) and cool fresh air comes in through the lower vented access door. This is the chimney effect.
So the condenser removes the heat from the fridge to the outside, not into the cabin. The cool air coming in the access door rushes over the condenser coils and out the top vent removing the heat very efficiently. This allows the Freon to expand and absorb the heat inside the fridge very fast. Then pumps that heat outside, not inside. If I hold a flame to the access door it gets sucked in, and if I hold a flame to the top vent it gets blown away, confirming the chimney effect. When the fridge is not running, little or no air movement. But when fridge is running definite verifiable air flow.
Whew, that was a long one. The point is you could use the same basic principle and get a two-fer. Since the AC, window air needs fresh air and a exhaust vent, if it was sitting on the reefer and the reefer condenser coil was in the duct as I described, when the AC was running it would pull outside air across the reefer coil then thru the AC coil then exhaust. When the AC was not running, you would get the chimney effect. Either way the heat from the reefer goes outside, not into cabin. A huge plus. Otherwise the reefer cond heat just goes back into the cabin and makes its way back into the reefer and goes around and around until you remove it, with an air conditioner. This way is more efficient for both units.
Bingo! A two-fer. I know, it's brilliant. Now I don't share that with just anyone, you know. But you are my favourite so I will let you in on it. As an added bonus, should decide to move forward with this cutting edge design, I happen to have a spare vented access door that I would gladly gift to you. So here is your chance to move out in front of the crowd and be a mover and a shaker, a visionary if you please. I've given you the fundimentals, but you will have to design the system to work with your machines and trailer. if you have questions I'll be happy to help. I can almost promise you there will be people to talk you out of it. But eventually, they will have to concede and adopt this system, then claim it as their own. You see, Physics are not just good ideas, They are the laws.
Think about it,
McDave
Here is a pic of the vented access door, and the upper vent. The duct is about 4" deep or so and runs form the top of the door to the upper vent. Propane, pump and stinky slinky are stored below.
by jwh92020 » Fri Jun 09, 2017 1:56 pm 
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80* maybe to much.
