Heat pump tumbe dryers: no measurable saving over condenser or vented

DullGreyGuy

How hard is your water? According to one manufacturer hard water makes it more difficult for the sensors in more basic machines... Im guessing it's true but no idea why it would be.

Our heat pump machine you can adjust what "normal" dryness is plus for most programs increase or decrease the dryness level. 

Our skin, unlike some other animals, have no moisture sensors. We feel things as "damp" as interpretation of other factors like temperature, its why something straight out the dryer may feel damp as the cuff is cooler than the sleeve but once its all returned to room temp it then feels dry as its a consistent temp. 

BobT36

Doesn't it allow you to dry by TIME? 
I never use the presets, and always just work out how long it takes to dry things, and set it based on that. 

Sounds like the problem is your model (beko are known as cheapo. The sort that landlords go for..), not the TYPE of dryer..

Sterlingtimes

DullGreyGuy said:

How hard is your water? According to one manufacturer hard water makes it more difficult for the sensors in more basic machines... Im guessing it's true but no idea why it would be.

DullGreyGuy said: Our heat pump machine you can adjust what "normal" dryness is plus for most programs increase or decrease the dryness level. 

DullGreyGuy said: Our skin, unlike some other animals, have no moisture sensors. We feel things as "damp" as interpretation of other factors like temperature, its why something straight out the dryer may feel damp as the cuff is cooler than the sleeve but once its all returned to room temp it then feels dry as its a consistent temp. 

Sterlingtimes: Thank you for your response. We employ an ion-exchange water softener, so our water is soft.

Sterlingtimes: My son has experimented with all settings on both machines, including the plus-plus settings.

Sterlingtimes: I think that you have a good point. "Perceptions" are all important. The family brings me clothing to feel, saying, "Do you agree that that is damp?". Sometimes, it is obviously damp, but on other occasions, I think that they are being picky. 

Gerry1

Hold the clothes against a mirror to see whether they're damp !

Sterlingtimes

BobT36 said:

Doesn't it allow you to dry by TIME? 
I never use the presets, and always just work out how long it takes to dry things, and set it based on that. 

Sounds like the problem is your model (beko are known as cheapo. The sort that landlords go for..), not the TYPE of dryer..

Thank you. I will check whether "dry by time" is an option.

The graph below illustrates Beko's resistance to drying once the sensors adjudge the washing to be dry. The spikes past 14:00 show that the machine will not be forced into extended drying by manual override. This is a poor dryer.

X-axis is time of day. The Y-axis is Watts, with each division indicating 500 Watts.

The Hoover behaves very differently. The Hoover was forced upon us by the insurers when the previous machine was condemned. 

mmmmikey

If I use the default eco setting on my (cheapest I could buy at the time) Candy heat pump dryer, the clothes come out "iron dry" and need half an hour or so at room temp to dry fully, at which point they're ready to be put away. If I use the whites setting which runs hotter the clothes come out dry - it uses a bit more energy on this setting but still way less than the Bosch condensor it replaced. Have you tried experimenting with the settings?

BellaBlondykeTheThird

It doesn't sound right that the newer technology heat pump dryers are using the same energy. So something is wrong.

Either the tumble dryers have a fault or they are being run incorrectly.

Perhaps they are drawing very cold air in rather than air from a heated home and this is causing part of the issue?

DullGreyGuy

Mrs just did a load... not exactly sure why I need notifications that she has nor how much power she used but given that its what the damned thing does... a 4kg on a 40C 1 hr quick wash took 0.4KW and 30L of water to wash and 0.2KW to dry to "normal" dry

A normal wash of 9kg takes 0.6KW and 36L but takes circa 2.5hrs. The tumble only shows what prior programmes were, only shows energy use on the last run programme.