DIY "indirect" Evap Air Cooler! No Humidity! only 39 watts! AC/DC air cooling! can be solar powered!
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- เผยแพร่เมื่อ 24 พ.ค. 2022
- DIY Evaporative Air Cooler! How to make a simple "Indirect" Evap Air Cooling System! Works great! this unit is made by combining one of my "direct evap" air cooling units with a radiator (plus a fan and pump). this creates what's called an "indirect" evap air cooler! these differ from the more common "direct type" in that indirect units create the cool air without adding any humidity to the room air! another benefit is its low wattage draw *only 39 watts! (plus it can be AC or DC powered - so it's good for on or off-grid use). a 12v battery or a 12v solar panel can easily power it!. the basic process: the main thing to know is that evap air coolers are also evap water coolers! they cool down both the air and the water to essentially the same temperature. these indirect units take advantage of that water cooling ability and use the cold water to make the cold air.
how the unit works: cold water in the tub is pumped through a heat exchanger (the radiator). this quickly cools down the radiator. then, using a fan, the air in the room is pulled through the cold radiator (which cools down the air). that's basically it, as the room air is cooled the water is warmed. (that's the 'heat exchange'). finally, the warmer water that exits the radiator is returned back to the water reservoir where it is quickly re-cooled. note that the water-cooling potential of the direct evap unit (the tote) far outweighs the radiators ability to heat it (so the water in the tub stays cool).
- please rate, comment and share! 🙂👍 ...also check below for extra tips/info/links.
🟢 Tip: if you're going to power the unit with a 12v solar panel it's best to use a 75w-100w one (to make sure you get the amps that you need)
🟢 Here's the link to my video on how to build the "tote evap air cooler" (previously posted video). • DIY Evap. Air Cooler! ...
🟢 Want to learn more about indirect evap cooling? here's a link to another video of mine showing how to set up a larger "room and house" size indirect evap air cooling system. has lots of extra info. (it contains almost everything i know about indirect evap cooling) • DIY "INDIRECT" Evap Ai...
🟢 Want to run a system totally off-grid? here's a link to my "100% solar panel powered" system (just runs on 12v solar panels). no batteries needed! • DIY "Indirect" Evap Ai... - วิทยาศาสตร์และเทคโนโลยี
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This video is just in time for summer. Today is my first 100 Fahrenheit day
yep. it's getting hot - if you haven't seen them already, make sure to check out my last 2 videos. they are both evap units too (and both are new for this summer!)
1.) video link to the "jumbo version" of this (made with a full-size box fan) th-cam.com/video/I6u6yCe8RzI/w-d-xo.html
2.) video link to newest/biggest direct unit (also made with a box fan)
th-cam.com/video/qAhzaBC2Reg/w-d-xo.html
@Tau Mag sounds like a possibility (but i would have to think about that one more). here's an idea: you could add one extra step to create what they call a two-stage evap cooler. just add a second radiator above the cool, humid *exhaust air. then just direct the warmed water (that just passed thru the first radiator) into the second radiator (to pre-cool the water before it enters the tub). it's definitely not necessary but it would make use of the discarded humid air.
@@desertsun02 that would make a good video from you?
This was my question
@@taumag5884 this was exactly my question
Love your DIY cooling solutions! Appreciate your videos!
thanks! and thanks for watching.
Thank you for posting this video! I am going to try this. Simple and brilliant. 😊
Excellent timing.....with the massive blackouts predicted this summer. Thanks for sharing you knowledge!
you bet! - if you haven't already, make sure to check out my other air-cooling vids. the last two are the biggest ones yet!
Awesome! Thanks for sharing, your videos are inspiring. When you throw the ice in there you're probably just warming the ice with the evap but it's a good fallback for when the ice gets to ambient temperature. You may already know this but I wanted to help otherwise.
Let's Go!!! Glad you uploaded this. We was just talking about something similar. Thank you
Right on! - if you're considering building evap or indirect evap make sure to check out my last 2 vids as well (both posted a couple of weeks ago). one is direct, the other is indirect). they're two of the biggest units i've made!
@@desertsun02 for sure. Thank you brother
This is SO "COOL" !!! 😍 Thank you
thanks! and glad you like it 👍
Love it brother! Thumbs up video ~John
By how much will it actually cool a hot room with the evaporation chamber outside it?
I think about this 2 years ago.look like ideas flows to the other continent. i am glade its working as I think
Do you ever tried to run outside air trough the water part, and use some heat exchanger on that line. So the humid air get out.
We have a store bought version (only because I bought at a warehouse cheaper than I could make one). It is small so we use small ice packs in it. Makes a huge difference so far.
You bought a unit that cools without putting humidity into your house. I would be interested. Can you share a place where I can buy or what I might search for?
What is the store bought version called?
@@nickdenuzzo1218 artic cool
@@litnoregrets7551yeah it's another swamp cooler only it don't use water. Waste of money. Even if you spent more money on a swamp cooler and used ice packs or ice you would have something better. 73
This is not like those cheap crappy fans that blow across Ice or ice packs. The one in the video puts cool water through an evaporator and the air goes through the fins and pipes. More like a real AC unit. Without the freon or compressor. 73
So I have no idea if this would work, lemme know if I'm way off base here about something
Rather than pumping water through the tubes could you instead direct the humid air flow through the cooling fins? The cold-humid air would pull heat from the fins, then pass the returning warm-humid air over a humidity filter to recondense the water out of it. Warmer water gets dripped through the evaporator, starting the cycle again.
The recondensing filter would need to be pretty big to avoid getting saturated, so if size is a limitation it wouldn't work, but it'd mean not replacing the water or 'losing' cold air to the outside
Good video , thanks for sharing , God bless !
hi. thanks again! God bless you too!
I'm considering adding something like this to my home swamp cooler, basically turning it into a mini-split type system. I have a window unit that pretty much only cools off my living room, so im hoping this may help cool off the rest of the house...
You are an amazing inventor!! I'm going to try making one but where does one get the radiator part? thank you for showing this!
hi. you can get the radiators (technically called transmission coolers) on amazon. just search for hayden transmission coolers. the one in the video is model 401 (but they have several sizes (402,403, 405)
what if the heat exchanger metal part was chilled by a mist exhaust fan, will the air be much cooler without humidity ?
I love the design, only the sound seems to be a bit strong. In one of your video's I saw you use a bigger radiator fan. Could that one be used to replace each of the shown fans? I rather go somewhat bigger and be more quiet. Would you try and demonstrate? (For traveling or as mobile setup, this looks amazing.)
hi there. oh, don't worry about that. to your ear they just sound like normal fans. they only sound strong because my camera has dual microphones on the front of the camera. it's like putting your ear up to it and listening. in reality, they just sound like 2 fans running. also note that the unit itself doesn't increase the sound of your fans in any way (so just choose fans that you like the sound of and you're all set) 👍😉
run a water tube connected to the pumpd thru the ground for climates that are humid.
You are geneius man
You sir are a WIZARD!❤👍👍👍. This is so freaking cool. I am going to make one of these things for my mom. Thanks for sharing this with us😊.
awesome!
So these don't work in humid area's like the North East? Thanks
Very useful and helpful this video is thanks,,,,,
You are most welcome
can this work as dehumidifier + air cooler
Thank you very much for the new video! Would you please post where to get those blue cooling/evap pads? Idealy an affiliate link, I'd love to support you 🙂
hi there. you can get the blue evap cooler pads at most home stores (like home depot and lowes). amazon has them too but they usually charge way to much. you should be able to get a 3' x 3' pad for under 10 dollars. (i get them for about 8 bucks at home depot). if you search for 'foamed polyester evap cooler pads' you will see tons of them
Cool video!
Thanks!
Very interested in solar air conditioning thanks!
hey, that's great! glad you liked it
I love your videos. I live in an equally hot dry climate to you but in South Australia and we get ridiculously hot days during summer! This summer is looking to be a scorcher so I'm interested in building one of your projects . We have a product here called Techni-Ice which is basically a dry ice packet which you soak in water first to hydrate it and then freeze it in your normal freezer. You can use it for ice or hot packs and not being made of water it stays dry and supposedly when frozen is meant to last longer than normal water ice in the right conditions. I'm just wondering if you have a similar product over there and if so I wonder how substituting that for the water ice would work out when comparing the two methods?
hi there and thanks. it sounds like an interesting product. i'll definitely look into it.
Just what I was looking for😃. I need something like this to bring down the temp inside a grow tent. I had in mind a Peltier cell to cool the water, but your project seems much easier to me. Can it handle bringing down the temperature steadily despite the weather hitting triple digits?
hi. yes it can. when it's 100F (where i live) with low humidity, you can get 71F air coming out.
@@desertsun02 Thx, buddy
Sir please make a video on electric food dehydrator for home use
What if circulating cold the water comes from porous clay pot?. is it feasible?
So what if you were to put the heat exchange in front of the air intake for the evap side? By that I mean: the ambient air is drawn past the heat exchanger before coming into the evap side, and so cools down BEFORE it even goes through the wet pad. Then it cools down even further going through the wet pad into the house.
Doesn’t make sense to do that. Energy cannot be created nor destroyed.
Hello. thanks for your video, do you think I should have such indirect evaporative cooling? is it effective?
hi. it works very well 😎✔
Try peltier modules with aluminum block water pc cooling blocks
This is awesome! How quickly does it use up the water? I guess it depends on how humid it is. Roughly how long can you go where you are?
hi. it goes through about a half-gallon of water an hour (and the tote as shown holds 2 gallons) so i'll go up to 4 hours. you can of course 'resize things' if you want a bigger water reservoir. my last video is of a tote evap cooler that uses a box fan and holds 20 gallons of water! that one goes thru a gallon of water an hour and will run for 16 hours! if interested here's the link th-cam.com/video/qAhzaBC2Reg/w-d-xo.html. this last link is of the video before that. it's an indirect system using a box fan that holds about 13 gallons and runs for about 10 hours! th-cam.com/video/I6u6yCe8RzI/w-d-xo.html
desertsun02 Thank you so much. You have some great ideas.
Great design, well done.
I want to make one myself, but I can't find a suitable heat exchanger. Where did you get yours?
hi. i get the heat exchangers from amazon. if you search for hayden transmission cooler you'll see them.
It's exactly what i'm using. Except I didn't built the evaporator fan myself, but bought a proper one with higher output to be able to cool the whole house. If running 24/7, it will consume about 3 cubic meter of water and 75-100kW/h of electricity per month. Cost me only 10-15$ monthly (price in my country, maybe 40-50$ in us if i'm not wrong)
Are you using the 1238 AC infinity axial fan and the Hayden 402 transmission cooler for this set up?
hi there. yes, it's the ac infinity 1238. note that there is a LS1238 (low speed) and a HS1238 (high speed). you can use either. i have both of those. i also have an optional speed controller that you can use with either fan. i am using the hayden 401 (but you can use the 402 also). the 402 is just a little longer if i remember right. btw - you can use any fan that you want. lots of different fans will fit in front of the radiator
@@desertsun02 Ok, good to know. I'm going to look for some deals on fans today. Thank you again!!!
watching this while using one of ur creations
that's awesome!
Excelente
thanks!👍 (and thanks for subbing)!
Great vid as always. Could you incorporate peltier panels ,into this system, to remove the use of ice packs ?
I would PAY to see that vid ! Cheers, Simon ( sundancer )
you could but peltier systems seem to cool the water very slow.
How many Watts is your cooling output with this Thing.
You could also add ammonia nitrate to the water it would get supper cold almost freezeing the water but wouldn't last long
Can u do this with a home ac unit if I change the coil and replace it with a different radiator and plum in the water lines
No, a compressor based AC is not designed for water.
Can you run this off solar? I was thinking this would be perfect if your power went out during a hot day in the summer.
hi there. yes you definitely can! i discuss that a little near the end of the video. but basically just use 12v dc fans and 12v dc pumps and then you can hook the whole thing directly to a 12v solar panel.
I’m confused how the water from the pad cools as it falls?
it cools because the evaporative effect works on the pad itself. so both the air passing through the pad (and the water going down it) cool off.
hello I decided to come up and reference this idea for my project, the temperature needed is around 13C to 15C. But I only get around 24C. What suggestion is best for it to achieve around 13C to 15C? Thanks if you read this.
I also added a water chiller peltier for the water to be chilled but I only get for around 24C
I'm using a rigid media type of evaporative pad since that's the only available, and using a two 1800 RPM and 74.5CFM PWM 12V Fan. Using this project for my tomato storage that is enclosed in a styrofoam box
Do I need a high cfm fan?
What was the starting temperature of the room? And what temperature did the room get to after the fans were on?
I like it. You could improve efficiency a bity by insulating the plastic box & hoses. Using ice is cheating because the amount of heat created in the process of making the ice is more than the ice will cool.
Cool 😎🆒️
thanks!
WOW a portable AC unit on the cheap!!!
Excellet video! However where I can buy the radiator?
hi. you can get the radiators on amazon. just search for hayden transmission coolers
Run that humid cool air into a cooler and you could chill drinks
I'm not familiar with the electronic side of things but it looks like I can just plug in a small water pump and a fan to the rest of the evap tote to achieve the most basic outcome?
yes, that's basically it! (along with the radiator).
@@desertsun02 Your inventiveness is contagious! Excited to try this! Hopefully we won't need it with predicted outages
Do you get condensation on the cold coils?
hi. not typically. but you certainly could if the humidity is high.
Sorry for asking this on a different video but could you tell me why my LED boards are getting too hot? I’ve obsessively watch all 3 of your videos. I know I have the right parts as from what I can see it is “snaked” like your first two videos but no matter what i do it overheats. I tried wiring it the way I see you have it in your last LED video from a year ago and it also got too hot. I’m at a loss. Id appreciate any advice you could give :)
hi there. it's normal for the units to get warm when there are lots of leds on them. what i do is run a fan blowing on the unit as i am using it. they need to be air-cooled if you run it for a while. sometimes i run my led light heating units for hours at a time. even a small fan works very well to cool the unit.
Firstly, thank you for responding!! This has become my literal obsession as of late! My son is an engineer but works in another state, he drew me up a wiring example so I’m pretty confident it’s as you showed. I guess my concern is HOW hot is normal. The leds, their leads and even the bottom of the board get crazy hot. Is that normal? I’m cool with it if that’s the norm but as of right now I don’t keep it plugged in longer than like 2 minutes because I’m convinced I’m going to burn the whole city down with my little diy project. So that limits it’s use quite a lot. Anyway thank you again for your response I really appreciate it.
And on a side note I’ve told at least 10 people about your channel. Thank you so much for sharing your talents with the world!
@Leah the amount of heat the unit produces will depend on a few things but mainly on how much power the leds draw and how many of them you use. it may also depend on the exact breadboard you use. some of them may have thinner connecting 'wires' in the breadboard itself which may cause extra heat. here is how mine is... the bulbs of mine just get warm but not hot. the leads on mine get very warm to hot after a while (but stay plenty cool with a fan). the board on mine gets warm but not hot. i consider all of this normal. my best advice is just to use your best judgement. if you think your unit is not working right or is unsafe then i would say don't use it. by the way, thanks for sharing the channel!
Ok, so, prior to asking you about this I ordered some battery cradles from Amazon. They came in today and I swapped it out. FIXED IT! No where near as hot as before. It’s barely even warm now. I had thought it was the adapter before so I ordered another one and it still was too hot BUT I ordered another of the same one when I probably should have ordered a different brand. Not sure what happened there I had it set to 3v. But anyway thanks for your help. Hopefully it can help someone else if they have the same issues.
Wish this worked here in Alabama. 🥺 Unfortunately I'm afraid it's too humid here. I may try it anyway since the other part goes outside. I'll let you know if it works.
hi there. these (half-work) in high humidity. what i mean by that is that the radiator part works great in any humidity (even 95%) but the tote evap chiller only chills the water well if humidity is 60% or less. your best bet might be to use the radiator part with another cold water source (ice cooled is one way). i have 4 videos showing how to make lots of these radiator coolers using cold water cooled with ice and ice packs etc. (i posted all 4 last summer - summer 2021). those work great in any humidity.
@@desertsun02 AWESOME! Thanks for the reply and I'll go check those out. I could probably use several frozen water bottles in rotation to keep it chilling.
@Carla Cowling yes, absolutely! all 4 videos are posted back-to-back on my channel but to make it even easier - here's the 4 links...
1.) th-cam.com/video/5YVPu9hfhZo/w-d-xo.html (original video on the topic)
2.) th-cam.com/video/DERYsKnlKzA/w-d-xo.html (2nd original video on the topic)
3.) th-cam.com/video/Jfc26AH0jLI/w-d-xo.html (larger box fan version)
4.) th-cam.com/video/oAuL-ScEWfI/w-d-xo.html (extended box version - w/extras)
Just build your small transcooler fan setup, 7inch fan with a 403 coil, it works good if your real close to it, it just eats up ice like a MF, maybe my pump gives off to much heat? Its an AC aquarium pump that i allready had, any suggestions on a pump?
Thanks
hi there. the transmission cooler and ice setups i made are great - but like you said, you need ice for them. this unit makes its own cold water. a bigger pump will warm the water faster in the ice -based units so the mini pumps seem to be the best to use. i recently bought a pump that doesn't even go in the water - i'll be trying that one soon.
What if instead of water box - cooler use camping fridge? To have a fridge and AC while camping 2 in 1. To Put metal shower pipes on the bottom of camping fridge and water pump will circulate cold water like in your system
Have you tried geo thermal cooling?
hi, i haven't tried that yet. the ground where i live is so hard and dense it's next to impossible to dig a hole. i may get a new pick axe and give it a try though (that's what you need to dig where i live. a shovel doesn't work at all)
can u make this thing at 1 watt?!?!?!??
Around 5:00 you say "most of the water does not evaporate it just goes to the bottom, so it super cools the water and it's constantly cooling the water at the bottom too". Please explain how this works. It seems to me the water that's going through the evap pad is picking up heat from the air, so it would actually be warmer by the time it falls to the bottom.
hi there. the "heat part" that you are thinking about is the heat that actually gets "trapped" in the air as "latent heat". the humid air that is produced actually holds that heat as "latent heat". (remember that the process of evaporation actually takes or requires heat) so as the evaporation occurs - cold air is left behind. as the room air gets pulled through the pad the air cools down (which then cools down the pad itself *because that is where the evaporation is taking place. that makes the pad cold too. then as the water runs down the cold pad - the water itself cools off. (and the heat (that is stored as latent heat) is blown away).
Where did you purchase the metal radiator?
i get those on amazon. if you search for hayden transmission coolers you should see them
will this work in humid environment?
hi. if it's only slightly humid they still work pretty good. they do struggle when the humidity is over 60% though. if the temps are lower like in the 70's then they can work okay up to maybe 70%. evap chart shows temps to expect.
Can we cooled a water using peltier?
It will be very expensive. Peltier needs much electric energy.
Worderfull, but sorry, I don't understand... do you have created negative pressure in the box intentionally to increase the evaporation from the sponge and to take a little advantage from thermodynamic laws (lower pressure, same volume = lower temperature)?
I don't think axial fan he used can generate much pressure
what is that blue pad called?
hi. it's called evap cooler pad.
Won't it work in humid environments?
hi. these units struggle to work in humid environments.
@@desertsun02 is there any solution for humid environments? I want to build a fan to cool a tent at the beach camping
@ozp11 i have a few ice-based air coolers. those work good in humid environments. they cool due to the phase charge of the ice turning from a solid to a liquid. (so no significant evaporation takes place with those units) *meaning no humidity is added to the air. i've got a few cold water/ice based units with fans and a few with radiators and fans. those would be the best for humid areas. check channel video page or playlist area to see them all in one place.
@@desertsun02 yes, I've seen them. Ice will be available there. But I'm not sure if they would last for a night sleep. I thought about using car radiator liquid instead os water. Then let it cold inside the fridge. And then use a closed system. The ice would be used with salt and alcohol. The issue is make something to last 8 hours
Hi sir, where can I buy that blue pad?
hi there. you can get the blue pads at most home stores (like home depot and lowes). amazon sells them too (but they over-charge usually). i big 3 foot by 3 foot sheet should cost you under 10 dollars. if you search the term 'foamed polyester evap cooler pads' you will see lots of them
@@desertsun02 Thank you!
*EDIT:* I just realized the problem with my idea below: it would create negative pressure, and thus hot outside air would likely leak in from somewhere else.
In most of your videos, you talk about running the chiller hoses through a board that is sandwiched in a house window.
But it seems like if you're willing to do that, then it would be better to vent the humid exhaust through that window board, and then keep both the evap box & the chiller fan in the house. That way, the evap box is working in a cooler environment to start with, than the potential 100F/40C outside. (And, humidity is possibly already lower inside, too, since if you also have A/C its condenser tends to dry the air.) I think I may try your sealed tote version, but mount the fan in the lid, and then put the matting on 4 sides. (Your 4-sided PVC skeleton versions have leaky suction between the matting and the PVC pipes) Thanks for the idea!
The fact that it leaks from outside doesn't mean it's a bad thing, your points are still valid
What’s the sqft this will cool?
hi there. it's hard to give a specific size area that these will cool. it will vary quite a bit on a few factors. a lot depends on how much you're able to cool the water (and that depends on temp and humidity of the air). also whether you use ice or not. it'll also depend on how hot the ambient air is along with how well insulated the room is. you can size the system to the area you want to cool but you'll have to experiment
is it effective?
hi. yes, absolutely!
So for a,small camper 5'×9' ?
hi there. that sounds about right for the space. i've got a larger version of this too (posted it a couple of weeks ago). it's made with a full size box fan. that one will really blast you out of your camper! if interested, here's the link th-cam.com/video/I6u6yCe8RzI/w-d-xo.html
@@desertsun02 l gold prospect in AZ...planning on building a small well insulated camper...
the condensation caused by the humidity can cause warm spots in your room.
That makes no sense
@@cordellscott when water goes from gas back to liquid it causes a rise in temperature.
How can we purchase it.what is the cost?
hi. i don't sell them (i just show how to make)
You built yourself a swamp cooler mini split.
Ice bath... Wins again.
use jet inside radiator
Add some salt and ice cubes for even cooler air off the rad!
Just pump from your well and return it works most places.
good idea 🙂
Don’t know if you’ll read this comment but what would the performance improvement be if you added a peltier water chiller to that? You could put the heat sink for it where the cool air comes off the pad.
Edit: more info
hi. and thanks for the comment! i read all comments on all videos, so always feel free to comment on any video. i see all of them. peltier might help a little but i'd have to give the idea some thought. i was recently thinking of adding a second radiator so i could chill the water that is fed back.
@@desertsun02 That sounds good another radiator won’t use additional power like a peltier. Would you consider testing the indirect cooler to see if it might cool a small tent effectively. I live in a hot place and it would be nice to make a solar powered cooling shelter. I would put the tent inside the house and hang out in there if the power went out or the AC broke. I live in the Coachella valley and it gets very hot here. So if I can keep a space under or at 90 during the day that would still be uncomfortable but it would prevent heat illness.
I built a small (6pk cooler size) heat exchanger unit last year using pc radiators and usb fans, it kind of worked but the outside unit drew the florida humidity like a magnet and it sweated worst than this fat man in the florida sun... I may try this set up just to see
How much cooling could I get without ice? How many degrees change do you reckon?
hi. it will all depend on how cold that water is. many people use natural cold water sources like 'well water' or even lake/river water. you can get excellent cooling even with the water temp in the mid 60's F
@@desertsun02 so if I am in Florida and it's high humidity and hot as hell like lets say 90 degrees to 100, I can take my well water at 72 degrees and bring the temp down significantly in the room. I'm thinking ice is not practical in case of emergency...unless.... Any ideas on making ice with solar panel energy??
@Joshua Luke Wilson if you've got a solid 72F cold water source you should be able to get some decent cooling. you might be able to get 77 or 78F air coming out (not too cold but a lot colder than 90 or 100). since you're in a high humidity area - you would only need the fan with 'radiator' attached to it. (you wouldn't need the evap part of this system). i have 2 or 3 videos on how to make ice with solar panel energy. here is a link to one th-cam.com/video/T9CcPZMK-bc/w-d-xo.html
Chiller
look a thing called a frankencooler.
If you could get cool creek water that's about 40 degrees you would have the best no humidity water cooler air. Our former church won a energy saving award for using something like this. They had water chillers that cooled the water. with antifreeze and water would go through the air handlers. Giving nice cool rooms. There was one drawback it wasn't good for taking moisture out of the air like freon does. So I would say not for Florida where the humidity is high. This might work in the mountains where cool running water is plentiful. 73
Measure the temp inside the house not directly from the fan. Bobo