[MaggieMarty]

I’m a little confused… in both these videos the testers used the indoor air as fresh air intake for the condenser and had pretty decent results in cooling their vehicles. So they didn’t use the outdoor (hotter) air to cool the condenser, but rather used the cooled indoor air. I was under the impression that this is a no-no?

Car test starts at 17:56

and this Van

 

[JimbobNY]

I’m a little confused… in both these videos the testers used the indoor air as fresh air intake for the condenser and had pretty decent results in cooling their vehicles. So they didn’t use the outdoor (hotter) air to cool the condenser, but rather used the cooled indoor air. I was under the impression that this is a no-no?

Car test starts at 17:56

and this Van

I’ve been wondering this too. Using only the exhaust duct would make this operate like the recirculating feature of the van’s AC. I’m sure the reduced humidity would have an impact too along with cooling air from inside.

 

[JoeandKim]

The exhaust air has to be made up or the interior will take on a negative pressure relative to the outside. When you use the intake hose that make-up air comes in via the hose. If you don't use the intake hose the make-up air will come in via leaks in the Promaster.

 

[MaggieMarty]

The exhaust air has to be made up or the interior will take on a negative pressure relative to the outside. When you use the intake hose that make-up air comes in via the hose. If you don't use the intake hose the make-up air will come in via leaks in the Promaster.

I understand the theory behind this, that’s why I posted those videos. I believe the guy with the van stated that he can get his interior temp down to 65° or something, that made me wonder if it’s worth a try.

 

[phil]

Mathers On The Map

To spare you from watching I'll give you a summary.

Older Ecoflow A/C, he sits in the van for several hours editing video, not a prefect setup, but his conclusion is what I would expect, ↑ temp ↑ humidity ↓ volume to be cooled

keep in mind that if you have 2000 lbs of stuff in your van that's stuff is storing heat too, a low mass build is easier to cool

He installed a Velit 12v rooftop A/C later

 

[JoeandKim]

I understand the theory behind this, that’s why I posted those videos. I believe the guy with the van stated that he can get his interior temp down to 65° or something, that made me wonder if it’s worth a try.

OK. I am Chemical Engineer and you really got me thinking about this. If I was a college prof I'd give this as a homework assignment. Tell me the best way to use the Wave 2. The way I have been testing the Wave 2 is shown in the top figure. The intake Air Temp (T-intake) is set by the ambient conditions and impacts the Conditioned Air temp. During the first test, T-conditioned as could only get to about 68-70F and T-Intake had to be 90+.

I think if I eliminated the Intake Air Hose and just used the Cab Area air I bet it would not perform much better or only marginally better. The temperature of the Cab (T-Cab) was noticeably warmer than T-van but probably not as hot at T-Intake. Just a guess.

I think what I will test is having the intake air hose run into the van area. I also will set the Wave 2 on the passenger seat (like Mathers) which will shorten the exhaust hose length and hopefully reduce the temperature in the Cab Area. I'm still concerned that all the air leaks will just be hot ambient air coming into the van area.

Let's see what happens.

 

[el Jefe]

OK. I am Chemical Engineer and you really got me thinking about this. If I was a college prof I'd give this as a homework assignment. Tell me the best way to use the Wave 2. The way I have been testing the Wave 2 is shown in the top figure. The intake Air Temp (T-intake) is set by the ambient conditions and impacts the Conditioned Air temp. During the first test, T-conditioned as could only get to about 68-70F and T-Intake had to be 90+.

I think if I eliminated the Intake Air Hose and just used the Cab Area air I bet it would not perform much better or only marginally better. The temperature of the Cab (T-Cab) was noticeably warmer than T-van but probably not as hot at T-Intake. Just a guess.

I think what I will test is having the intake air hose run into the van area. I also will set the Wave 2 on the passenger seat (like Mathers) which will shorten the exhaust hose length and hopefully reduce the temperature in the Cab Area. I'm still concerned that all the air leaks will just be hot ambient air coming into the van area.

Let's see what happens.
View attachment 97073

Fun stuff chemi. Now, using all those data points, you can plot those on a Psychometric chart and loosely predict the results. Of course you will need to measure infiltration/exfiltration, relative humidity, CFM, deltaT's..... Or empirically, use the equipment in a worst case scenario in latent/sensible conditions and skip all the above. If all performs within the comfort window on the Psycho....Bob's your uncle and you don't need to return the equip for a refund.

 

[JoeandKim]

Fun stuff chemi. Now, using all those data points, you can plot those on a Psychometric chart and loosely predict the results. Of course you will need to measure infiltration/exfiltration, relative humidity, CFM, deltaT's..... Or empirically, use the equipment in a worst case scenario in latent/sensible conditions and skip all the above. If all performs within the comfort window on the Psycho....Bob's your uncle and you don't need to return the equip for a refund.

Come on, that's boring. It's the internet. We have to argue.

 

[el Jefe]

Come on, that's boring. It's the internet. We have to argue.

How can I even think about arguing with someone willing to take an empirical hit for the Promaster Forumn team?

 

[JoeandKim]

The Saga continues.

I tried using the van air as make-up air for the unit. More or less the same result.

Time	Van Temp	Ambient Temp	AC Outlet temp
12:40	94.1	86-88
1:15	89.4	86-88	60.4
2:00	87.6	90-92	62.8
2:25	88.7	88-90	63.5
2:50	87.6	86-88	63.0

For today's experiment I will move the AC unit to the passenger seat which significantly shortens the exhaust hose length. I also wrapped a towel around it as some insulation. I'm taking bets.

 

[Bromaster5]

The Saga continues.

I tried using the van air as make-up air for the unit. More or less the same result.

Time	Van Temp	Ambient Temp	AC Outlet temp
12:40	94.1	86-88
1:15	89.4	86-88	60.4
2:00	87.6	90-92	62.8
2:25	88.7	88-90	63.5
2:50	87.6	86-88	63.0

For today's experiment I will move the AC unit to the passenger seat which significantly shortens the exhaust hose length. I also wrapped a towel around it as some insulation. I'm taking bets.

View attachment 97104 View attachment 97105

A Youtuber mentioned the exhaust hose gets hot, about 90F I recall, so it should help to insulate it and shorten its length. The same would go for the other hose, it would deliver colder air if it was insulated. Residential HVAC ductwork is insulated to R6/R8 based on specs, its probably not, but its enough to eliminate condensation problems in ducts.

Im still not feeling positive about your Wave2. Its OK to admit defeat!

 

[JoeandKim]

A Youtuber mentioned the exhaust hose gets hot, about 90F I recall, so it should help to insulate it and shorten its length. The same would go for the other hose, it would deliver colder air if it was insulated. Residential HVAC ductwork is insulated to R6/R8 based on specs, its probably not, but its enough to eliminate condensation problems in ducts.

Im still not feeling positive about your Wave2. Its OK to admit defeat!

I will die on this hill!!! 🤣 🤣 🤣 🤣 🤣 I never imagined it would cool the van during the day. My main goal is to have something that will cool the bed area on hot and humid nights. I know it will serve that purpose. The real question is that comfort worth $1000. For us, yes.

 

[Paul Niedermeyer]

Maybe paint the van white? Why would anyone buy a black van in a hot/warm climate?

 

[rjcarter3]

I will die on this hill!!! 🤣 🤣 🤣 🤣 🤣 I never imagined it would cool the van during the day. My main goal is to have somethi whyng that will cool the bed area on hot and humid nights. I know it will serve that purpose. The real question is that comfort worth $1000. For us, yes.

Nothing worse that trying to sleep when it's too hot. I'll take frigid weather camping any day over that.

 

[JoeandKim]

And we returned it! It must have a design flaw in that all of condensate is not collected in the tank. Once done using, as soon as it is moved water leaks from various spots on the bottom. Watched a YouTube video showing the exact same problem. I was hoping it was just mine. Nope.

 

[JimbobNY]

And we returned it! It must have a design flaw in that all of condensate is not collected in the tank. Once done using, as soon as it is moved water leaks from various spots on the bottom. Watched a YouTube video showing the exact same problem. I was hoping it was just mine. Nope.

Cant wait to get excited and eventually let down by the Wave 3!

 

[Rick 2018 PM]

Cant wait to get excited and eventually let down by the Wave 3!

This is a real bummer. My EF2 is performing lower than my worst expectation. I will probably return it tomorrow. I sure wish there were more good choices that would b powered off of house battery!

 

[Bromaster5]

And we returned it! It must have a design flaw in that all of condensate is not collected in the tank. Once done using, as soon as it is moved water leaks from various spots on the bottom. Watched a YouTube video showing the exact same problem. I was hoping it was just mine. Nope.

At least you admitted it!

 

[JimbobNY]

And they’re down to $1500 with the battery.

 

[Bcloetta]

Well, dang. I am waiting on delivery. Guess I'd best do some serious testing. I did get excited to see that it will sit between the promaster seats as I don't want to do any serious permanent installation or drilling.