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Old 05-08-2019, 03:21 PM   #11
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It looks like a Peltier device with a fan blowing over it. Pretty pricy for something that is probably not much more effective than a fan for $30.
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Old 05-08-2019, 03:52 PM   #12
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It looks like a Peltier device with a fan blowing over it. Pretty pricy for something that is probably not much more effective than a fan for $30.
I think the website said it was a mini compressor.

What my question would be is if it only has the one exhaust connection, as if it does it will be taking hot humid are someplace. Normally the condensers use all outside air so you can have no hot and humid coming in.
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Old 05-08-2019, 04:41 PM   #13
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I think the website said it was a mini compressor.

What my question would be is if it only has the one exhaust connection, as if it does it will be taking hot humid are someplace. Normally the condensers use all outside air so you can have no hot and humid coming in.
Exactly, not the best route for efficiency. This design could benefit from a single fan motor coaxially driving 2 fans, similarly to Eberspacher Airtronic D2/4.
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Old 05-08-2019, 08:22 PM   #14
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Exactly, not the best route for efficiency. This design could benefit from a single fan motor coaxially driving 2 fans, similarly to Eberspacher Airtronic D2/4.
isn't that a air heater not an air conditioner?
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Old 05-08-2019, 08:36 PM   #15
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isn't that a air heater not an air conditioner?
It is air heater indeed, there is a single motor coaxially powering fans for combustion and recirculation air. See this video at 0:40 with 2 fans beginning to rotate powered by the single motor. The same concept could be used in the AC.
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Old 05-08-2019, 09:04 PM   #16
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It is air heater indeed, there is a single motor coaxially powering fans for combustion and recirculation air. See this video at 0:40 with 2 fans beginning to rotate powered by the single motor. The same concept could be used in the AC.
does this also have a compressor?
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Old 05-08-2019, 10:58 PM   #17
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does this also have a compressor?
No, just one motor with 2 fans and diesel positive displacement pulse pump. One fan is pushing recirculating cabin air and the other one is pushing combustion air into the combustion chamber. Fan motor runs at 4 speeds pushing both air flows proportionally higher or lower at different RPMs.

In case of the discussed AC there could be one fan motor pushing air through condenser coil with the fan wheel on one end and through the evaporator coil with the fan wheel on the other end. This approach could reduce AC cost by one less motor and one less control. If the designer used cheep pancake fans than perhaps not. This one is similar to the compressor they used - https://www.coowor.com/p/20181102154...compressor.htm
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Old 05-09-2019, 01:34 AM   #18
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Default I Bought a Zero Breeze To Experiment

The Zero Breeze is indeed a small 1,100 BTU A/C. It needs about 11 Ampere on 12 volt DC. Of course it has the limitation of doing only one-tenth or one-15th of the work of a full-size A/C. But as side product it runs for eight hours on 100 AH. I plan to Take advantage of this.

our intention is to create a cooler, but mainly dryer, minimalist Oasis over the bed-platform of our 2008 RT190P, when overnighting along the way, without shore power, and without the need to run the generator. We have made some preliminary tests.

When in use the Zero Breeze sits on the galley counter with its cool/dry air output port angled into the aisle toward the bed. The port for the air return flow over the evaporator is on the aisles side. I am using a 12 inch by 18 inch slice of 1/2-inch packing poly-foam (with the A/C's body cross-section cut out of it) as a vertical separator between the cool-airflow-path and the cooling path for the condenser section. The condenser section takes air in from both sides of the A/C and blows the warm air out the rear via a flexible three-inch duct. When expanded the outlet-duct is about 40-inches long and gets aimed upward to the MaxxAir roof-vent running at its lowest speed. I slight open the cab windows to complete the cooling air-loop for the condenser. The shower curtain pulled across the aisle and the open toilet door isolate the cool/dry and warm/humid areas from each other.

So far result have been promising, although we have not yet tested the arrangement under extreme conditions. We have 400AH of Lithium battery capacity, therefore, running the A/C in this manner several nights while traveling will not be a problem. We also have the option of a pre-cooldown/dry-up by running the RT A/C for an hour or so, either on inverter or ONAN.

I noted the discussion on using the conventional approach of moving condenser- and evaporator-air via a single motor. This is impossible on the layout of the Zero Breeze as the shaft would have to pass through the compressor. There really is not enough space. The single motor and long shaft approach is commonly used as an economy and space reduction measure. Also in the Zero Breeze the blower on the evaporator end has a shaft axis at right angles to this shaft-path.

There is an advantage to using independent blowers. The condenser section can be run at maximum practical blower-speed to remove a maximum of coolant-heat, while the evaporator air-speed can be reduced (three speeds in the case of the Zero Breeze) to keep the evaporator just at the dew-point. This ensures maximum humidity reduction. Lower noise is a side-benefit.

I hope this helps. Any questions? I need suggestions.

Gerard M.
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Old 05-09-2019, 01:54 AM   #19
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Default I Bought a Zero Breeze to Experiment

A bit more information I should have mentioned.

The water/condensate outflow connection falls directly over the galley sink. The outflow could be allowed to go into the grey tank, but we catch it in a basin and dump it as it is clean water. To ease the condensate outflow we raise the other via a six-inch piece of 2x4 lying flat.

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Old 05-09-2019, 02:01 AM   #20
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our intention is to create a cooler, but mainly dryer, minimalist Oasis over the bed-platform of our 2008 RT190P, when overnighting along the way, without shore power, and without the need to run the generator. We have made some preliminary tests.
Gerard, good to hear it helps "just enough" to make things more comfortable. Your application makes sense.
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