How do dishwasher dry cycles work?

[Martin]

Now the modern diswashers don’t have an element in the tub, how do the dishes get dried?

[Alex]

Re: How do dishwasher dry cycles work?

Residual heat. I’m surprised you asked that question.

Most dishwashers rely on the heat left behind following the final rinse at about 65 degrees. I don’t know of many that use assisted drying. Some AEG have a fan in the door to give a bit of added convection. The ecological rating would be thrown into apoplexy if there was any form of added heating at the end.

Hope that answers your query.

Alex

[iadom]

Re: How do dishwasher dry cycles work?

One Hotpoint slimline from a few years ago held cold water in a tank at the back which caused the moisture to condense on the the cold back panel and drain away. The water from this rear tank was used on the next wash cycle and refilled towards the end of the cycle.

One reason why the user should not open the door as soon as the machine has stopped making any noises is to allow the residual heat to work its magic.

[Seamy]

Re: How do dishwasher dry cycles work?

Some Miele dishwashers have an ectractor fan in the door to assist drying, the newer ones have a system of a heat exchanger where hot air is passed over cold to condense steam, you will see in these machines the fans have two impellors. Sometimes when cstomer opens door at end of cycle they see droplets on one side of dishwasher only & think its a fault, but this is just below duct of heat exchanger & is normal for this type of drying.

[Martin]

Re: How do dishwasher dry cycles work?

Interesting answers so far gents, thanks!

Those appliances without fan assistance don’t simply rely on residual heat though surely? How does this latent heat dissipate the mass of water droplets from the ceiling of the tub and the baskets?

[Alex]

Re: How do dishwasher dry cycles work?

Martin wrote: Those appliances without fan assistance don’t simply rely on residual heat though surely? How does this latent heat dissipate the mass of water droplets from the ceiling of the tub and the baskets?

They surely do. It is surprising how hot 65 degrees is, try holding the back of you hand under a hot tap. Open the door part way through a hot wash, and you will see the water “chase” off the door liner.

I suspect you recall the old 4805 Zanussi/Hoover that used to do a pulsed dry phase off the element. The only other machines I remember doing that was the old Candy “Silent”. (I bet Ken will be shuddering as he reads about those, and now he has sloped off to a darkened room). IThat was when energy was cheap. Can’t speak for Hotpoint or Bosch.

Going back to residual heat, the effects are diminished if the customer leaves the door closed, and unattended for several hours after completion, as there is a risk of condensation.

Alex

[kwatt]

Re: How do dishwasher dry cycles work?

Alex wrote:I bet Ken will be shuddering as he reads about those, and now he has sloped off to a darkened

Oh dear God. Was that teh one with the sliding handle on it that kept breaking, which if it was the only problem it’d have been okay. It wasn’t.

K.

[iadom]

Re: How do dishwasher dry cycles work?

Hotpoint ( Bosch) in the old days, 840 to 870 Hotpoint model range used the main heater at the end of the cycle to assist in drying. If my fading memory serves me correctly ( I did the trainig at Peterborough on these in the late 70’s 😯 ) the heater had something called ‘Inconel’ coating to allow it to operate in and out of water. Then and again, I may have just dreamt that. 😀

[Author]

Posts