chiefvintage wrote:flboy wrote:If you just want to be cool at night.. it will work for that. Mine did keep it cool at night... due to the outside temp dropping and lack of sunlight on trailer skin. It never did really dry it out in the CTC however, as it was pulling in humid outside air at the rate it discharges air outside... but the moving cool air was nice for sleeping.
I did modify my unit to make a 2 hose system where is could draw condenser cooling air from outside, and it did help a lot... it was just not a 1 to 1 ratio. I used a cake pan the same size as the intake on the rear of the unit and made a foam gasket and cut a 4 inch hole in it and attached a dryer hose and put another hole in the floor. I used 2 bungee cords to hold the cake pan on snugly.
Best of luck. Enjoy camping season!
Don
So if I’m following you correctly your saying to minimize the negative (differential) pressure between inside and outside air. So introduce more outside air directly across the condensing coil, but isolated from the recirculating inside air across the evaporator coil? I’m no HVAC expert but I assume these portable units have both.
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Yes, that is what I am saying. the one hose system is drawing condenser cooling air from the room and expelling it outside (hot air) and the evaporator is drawing from the room and expelling inside (cool air). Drawing air from the room and expelling it outside causes a relative vacuum inside it draws air from outside. That is where the inefficiency comes in, so if you could draw the condenser air from outside and expel outside, it would not create the vacuum.
These one hose systems were made to cool a room in an already air conditioned house whereas the room just doesn't cool as well as the others or someone prefers thier single room much cooler than the rest of the house. It is drawing air in from outside even in the big house, but the relative size and the fact that the larger central air conditioner is making up for it... it is not noticed. Also, it is effectively drawing in cooler air from the rest of the house. They work great in that scenario which they were designed for. Still not overall efficient, but small bananas for a big house ans solves a problem with just a small 4" hose sticking out a window adapter.
I hope that makes sense. I had no idea of this myself... or never really thought about it when I purchased one for my first CTC. I bought it for the stealth aspect and venting through the floor with minimal work. It was 10,000 BTU and just would not cool my 14*7*6 ft CTC and it ran constantly during the day. I sold it to a guy who was aware of how these work and just bought it to blow cool air on his wife who was always too hot and wanted to turn down the central air to satisfy her sitting on the couch or in the dining room.
But, like I said, if you bought this for night use and sleeping.. It may work if temps cool down outside at night... Mine did for that use and I used it that way for a whole season. I just wouldn't expect much out of it during the day if it is above the high seventies to low eighties outside. This has just been my experience.. and a few other I have talked to after the fact.