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? About evaporative cooling
19 replies to this topic
Posted 07 January 2013 - 10:31 PM
For those of you that have evaporative cooling, approximately what temp does your house sit at when it's around 38 degrees outside with low humidity? Also does it leak a lot of water onto the roof (like a constant stream)?
I just think ours is not working effectively but trying to see what's normal before I go and complain to the real estate. Thanks in advance for any replies
Posted 07 January 2013 - 10:36 PM
Ours has a constant stream onto the roof - they are supposed to.
They also begin to lose effectiveness about 38-40 degrees. I don't have a thermometer but today was 40 degrees here and I had the fan on high and it felt like it was still about 30 degrees inside. It was pleasant enough but no great shakes.
Don't get me wrong, so much better than without it, but at 38 you will notice it start to be ineffective - the lower the humidity the longer it'll last.
The filters do need replacing at times, you might want to find out when it was last serviced.
Posted 07 January 2013 - 10:36 PM
I don't have evap myself but my neighbor does. On recent hot days (42deg) she said her place was sitting on 30+ deg. She came to my place to visit to get out of the heat.
I think I have heard they do dump their water ... not 100% sure tho.
Posted 07 January 2013 - 10:44 PM
We have had a lot of trouble with it recently it is very old and the straw pads have rotted away. The man stuffed insulation in it to cover the holes and it seemed to work well for about a month but today seems to be blowing hot air.
By water running off the roof I mean its like a tap running constantly not a drip. A previous issue we had with it was that the water was running into our ceiling not off the roof but that has been fixed now so I had never noticed water running from the roof before!
Posted 07 January 2013 - 10:49 PM
Our house sits around 27/28 on 40+ days if we use the evap air con.
Also we had our air con serviced last year and the guy said that they should NOT be constantly leaking water as this means it is constantly refilling and using excessive water. He said it should refresh every few hours and after the service this is what it started doing.
It doesn't constantly run down our roof though, we have a pipe that feeds it straight to the garden beds.
Posted 07 January 2013 - 10:57 PM
Ours is brand new - we got it four weeks ago (YAY !!).
It keeps the house reasonably cool on insane days like today (40 degrees, 100% humidity); it cycles its water, so it only dumps it every four hours or so; it has a pipe - it doesn't run over the roof.
Your Evap sounds clapped out I'm afraid ! If it has no pads, I have NO idea how its cooling....
Posted 07 January 2013 - 11:08 PM
They say (most a/c places) that evap is supposed to sit at around 10C lower than outside temp approx. You also need to leave some windows open. If there is condensation on the floor then you need to open more windows.
Ours was serviced this year as the motor was cactus and also the water pads needed replacing. Apparently the water pads are supposed to be replaced every 2 years. We also had birds nesting in it! lol
I much prefer, and wish we could afford refrigerated a/c but it is too expensive to convert.
Posted 07 January 2013 - 11:16 PM
I think ours has a stream onto the roof only because the pipe (and the gutters!) are wearing out. I was told it was supposed to be getting rid of the water it was though.
Posted 07 January 2013 - 11:29 PM
They do dump water but it shouldn't be happening constantly, ours has a pipe that dumps the water, last year we started noticing that it was constantly dumping water, we had someone come out to take a look at it and some sort of valve needed replacing, it was a simple fix (though we had to wait a week for them to get the part, so they turned it off for us so we weren't wasting water while we waited).
Posted 08 January 2013 - 12:42 AM
Ours works incredibly well in dry heat, even at 40 odd degrees, it won't even be working hard and it's incredibly cool inside. As soon as you add a smidge of humidity, it becomes almost unbearable, and today was just shocking, I think it was high 30s and really high humidity. The only way we get through days like today with the humidity and high temps is alternate between the pool and the house LOL.
If I ever build I will install reverse cycle, Perth has become so much more humid now although maybe a mix of the two might work. I love evap for the open doors & windows and most nights it's pretty good, maybe I'll put in a large split system in the main area for the really humid days.
Edited by zande, 08 January 2013 - 12:42 AM.
Posted 08 January 2013 - 01:07 AM
I have been in my rental property for 3 years now. We had them check it on the first year as it barely does a thing, and we were told it is normal for them to not work effectively in the high 30's.
Q though, the ducts are really dusty and we can barely feel any air blowing through. Do we need to get someone in to clean them? and who's expense should it be?
Posted 08 January 2013 - 06:21 AM
On our recent 45C day, the hottest room in the house got to about 29. The main living area was more like 25 or 26. We have ducts in 5 rooms. As long as you start it up early, before the house gets really warm, it manages pretty well. But I still miss my good old fashioned US refrig. a/c
As for water, ours goes down a gutter pipe into the backyard. The ground doesn't get swampy from it, or anything, and it keeps our back lawn green all summer
They definitely need to be cleaned, have filters replaced, etc. Ours didn't work for crap til we replaced the filter. Also, contrary to every bit of my upbringing, you need open windows for it to work properly. We keep the sliding kitchen door open and crack a few other windows a fair way.
Posted 08 January 2013 - 06:42 AM
On a hot day our home will sit around 26 degrees inside.. I have to put it on early though or once it gets too hot it can't cool it down..
It shouldn't run water continuously only dumping water once an hour or so depending on the heat..
Posted 08 January 2013 - 07:43 AM
It was 40ish here the other day and 24 in our house. I love our evap.
I do think it depends on a bunch of other things though. To keep our house cool when it's stupidly hot we:
- Use the cooling unit to suck in cool air overnight (or leave the cooling on if it's hot) so we start out with a fairly cold house some mornings
- Have external blinds to cut some of the radiant heat
- Have several deciduous trees providing shade to the house
- Have a lot of plants in the garden rather than lots of paving, it can cool the area by several degrees
- Have cavity wall insulation
- Close internal blinds when the sun hits those windows
Posted 08 January 2013 - 07:57 AM
Ours is 24-26 in 40C heat. As PP's have mentioned, turn it on first thing, before it gets too hot in the house, and have a window or door in every room open a crack. I have lived in my house for 4 years, and I have only noticed it dumping water a couple of times, so it definitly shouldn't be a constant thing.
Posted 08 January 2013 - 07:57 AM
When it got to 39 on the weekend it was 27 in our hottest room (which faces directly west with a huge window) with our evap on. The trick is to get it running early before it gets too hot.
We get ours serviced every year or so, it only costs about $120 and they clean the filters and what not.
Posted 08 January 2013 - 08:27 AM
It should definitely not be running water all the time. This indicates it needs a service and probably the dump valve replaced.
You should get around 10-12c drop in temperature, so don't expect it to be "cold" in the house - I much prefer evap for this reason as I hate feeling like I'm in the fridge!!
You must have a window or door open in each room that there is an outlet. Remember that the cooler is pumping a huge volume of moist cool air into the room. If it is closed then you will just get condensation build up and it will feel sticky. A good guide is to put a tissue against the fly screen. If the tissue sticks to the screen then you need to open more windows. If it gently falls to the floor, then your ventilation is perfect:)
I also like evap with kids because they usually leave the door open anyway!!!!
Posted 09 January 2013 - 12:02 AM
Thanks everyone, I had the repair man out today and the running water constantly was being caused by a blocked gutter causing the water to pool and then eventually running out causing me to think it was running water when the evap was turned off! Gutter unblocked now so should be all good from now on.
It does cool the house to around 10 degrees below the outside temp so must be working ok
Posted 09 January 2013 - 12:51 PM
Hi OP, it sounds like yours is working fine now - 10 degrees below the outside temp is about what ours does when it is working effectively (low humidity). Ours doesn't drain onto the roof either so glad you got that sorted out, too!
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