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#4783370 - 06/10/18 08:46 PM How much water was in those towels
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia
Those who've known me for a while on here would understand that I LOATHE tumble driers.

We turn coal into heat, into electricity at the power stations at 40% efficiency, push it down the lines, and the tumble the clothes in that electricity turned back into heat...unfortunately there's no coal fired tumble driers (not really it's smelly).

When nature provides the means to the evaporation of water from clothes for free.

Well the new house doesn't have the sun that the old place did (nearly full exposure of the line sun up to sun down at the old place), so I spent a few hundred $ to get a long line, and orient it the the best I can, but there's still only just enough sun to get most of the clothes dry (the bamboo socks never make it in one run).

So the freeby, inefficient clothes drier has been getting more of a run than I would like (I accept that zero isn't an option)...much more.

And it's dumb, you put the clothes in and set a timer...and it's easier to overset the timer to be sure they are dry than it is to go out and test them every now and then.

So resigned to that fact, Son and I went hunting for efficiency yesterday.

Heat Pump (to get that thermal efficiency back), and condensing to get/use the heat of condensation of the water that's been evaporated out of the clothes.

Miserable day yesterday, so did a full load of towels to replenish stocks, and this is how much water came out



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#4783386 - 06/10/18 09:00 PM Re: How much water was in those towels [Re: Shannow]
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia
2 litres, and it was cold as it entered the container.

2Kg at 2,264KJ/KG (latent heat) - 4,528Kj
2Kg at (lets say 70C Delta T) at 2KJ/KgK - 280Kj

So I got 4800Kj back from the condensing and cooling water, at 3,600Kj/KWh, that's 1.3KWh I got back in that part (condensing section) of the unit, plus whatever the heat pump coefficient of performance is (better than 1).

Plus it's "smart" so it won't keep running regardless of the doneness of the clothes.
And it's programmable, so when we get solar (after we sell the old place) I can set it to start at mid-day anyway (yes I know that's not my poor weather statement, but If I can power it free, why not).

Sorry for this last bit, that's just the efficiency engineer coming out.

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#4783390 - 06/10/18 09:03 PM Re: How much water was in those towels [Re: Shannow]
PimTac Offline


Registered: 03/04/17
Posts: 4967
Loc: Soviet State of Washington
This reminds me of a Panasonic dryer I saw recently when I was in Asia. Instead of using heat it used air plus a air conditioner type setup that removed the moisture from the clothes. It was supposed to be very efficient but I wondered why nobody else was doing this.

Coupled with a inverter compressor it might be very economical. I will never know.
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#4783396 - 06/10/18 09:08 PM Re: How much water was in those towels [Re: PimTac]
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia
Originally Posted By: PimTac
This reminds me of a Panasonic dryer I saw recently when I was in Asia. Instead of using heat it used air plus a air conditioner type setup that removed the moisture from the clothes. It was supposed to be very efficient but I wondered why nobody else was doing this.

Coupled with a inverter compressor it might be very economical. I will never know.


Hope that the link works
https://www.researchgate.net/profile/Kue...othes-Dryer.pdf

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#4783402 - 06/10/18 09:17 PM Re: How much water was in those towels [Re: Shannow]
JHZR2 Offline



Registered: 12/14/02
Posts: 41982
Loc: New Jersey
Natural gas dryer with a humidity sensor solves a lot of those issues smile

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#4783412 - 06/10/18 09:28 PM Re: How much water was in those towels [Re: Shannow]
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia
There's only two gas drier suppliers in Oz, so I didn't look for them.

Plus requiring venting to the outside, and a connection plumbed into the double brick house.

(the simple one was outside to avoid the humidity in the house. The Condensing one doesn't add humidity)

Plus gas is as expensive per KJ as unleaded petrol these days. (yes electricity is twice that but with the COP of the heat pump, and the condensing function, the running costs are lower).

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#4783421 - 06/10/18 09:38 PM Re: How much water was in those towels [Re: Shannow]
PimTac Offline


Registered: 03/04/17
Posts: 4967
Loc: Soviet State of Washington
_________________________
2017 Mazda CX-5 Grand Touring

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Mobil 1 M108A EP filter


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#4783425 - 06/10/18 09:41 PM Re: How much water was in those towels [Re: Shannow]
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia

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#4783432 - 06/10/18 09:44 PM Re: How much water was in those towels [Re: Shannow]
CT8 Online   content


Registered: 10/09/14
Posts: 11512
Loc: Idaho
You could hang the towels to dry on a clothes line outside.Or if there was a way to create a vacuum and boil the water out of the clothes.
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#4783433 - 06/10/18 09:45 PM Re: How much water was in those towels [Re: CT8]
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia
Originally Posted By: CT8
You could hang the towels to dry on a clothes line outside.


Did you read my post ?

That's what we always do...but sometimes we need to use the drier, and at this place a lot more than the old place.

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#4783448 - 06/10/18 10:15 PM Re: How much water was in those towels [Re: Shannow]
PimTac Offline


Registered: 03/04/17
Posts: 4967
Loc: Soviet State of Washington
So you are saying these dryers are not efficient as they are advertised or are you trying to be super frugal with your expensive electricity?

Another option would be to have a drying room or area with the clothes hanging and a large fan or fans to accelerate the process. Iíve seen this also in SE Asia on the tops of condo or apartment buildings. Each tenant had a chain link section and there were fans to help dry the clothes. Of course the sun had a part in this but the humidity was tops.
_________________________
2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter


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#4783451 - 06/10/18 10:18 PM Re: How much water was in those towels [Re: Shannow]
ZeeOSix Offline


Registered: 07/22/10
Posts: 18244
Loc: PNW
Originally Posted By: Shannow
So resigned to that fact, Son and I went hunting for efficiency yesterday.

Heat Pump (to get that thermal efficiency back), and condensing to get/use the heat of condensation of the water that's been evaporated out of the clothes.

Miserable day yesterday, so did a full load of towels to replenish stocks, and this is how much water came out




Doesn't your washer have a good spin cycle? Or did you wash about 50 big towels.

When my washer gets done spin drying the towels are just damp, couldn't squeeze anymore out, except with maybe an old fashion press roller.

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#4783456 - 06/10/18 10:22 PM Re: How much water was in those towels [Re: Shannow]
Shannow Online   content


Registered: 12/12/02
Posts: 40511
Loc: 'Stralia
8Kg washer
8Kg drier

Definitely can't squeeze any more water out after the spin is done.

It was full...three days of drizzling rain.

The drier will of course be harvesting humidity from the ambient air as well.

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#4783458 - 06/10/18 10:28 PM Re: How much water was in those towels [Re: Shannow]
sleddriver Offline


Registered: 02/06/10
Posts: 4805
Loc: Central Texas
Interesting. Never seen nor heard of a HP dryer before. I too have a lot of shade; and no gas lines.
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#4783464 - 06/10/18 10:34 PM Re: How much water was in those towels [Re: Shannow]
CT8 Online   content


Registered: 10/09/14
Posts: 11512
Loc: Idaho
Originally Posted By: Shannow
Originally Posted By: CT8
You could hang the towels to dry on a clothes line outside.


Did you read my post ?

That's what we always do...but sometimes we need to use the drier, and at this place a lot more than the old place.
Yes I did and you still could hang them out instead of rant. My grandma would hang her laundry on a clothesline in San Francisco California.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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