Bosch Condenser Tumble Dryer: Comparing WTW85460PL Heat Pump Model and Conventional Options

I have a heat pump dryer, the hanging dryer went to the trash. I cannot imagine any other drying method. I sincerely recommend. Each laundry ends up in the dryer.

According to my analysis, a heat pump dryer is not a good solution at the moment. I don't even mean the price of the device (which also matters), but the fact that drying takes much longer than in a classic B-class dryer. At my friend's 9kg Electrolux, the cotton wardrobe program lasts 4:20! In the back, the laundry will dry on a string :D

The problem now is that dryers without a pump are forgotten - I wanted to order Bosch WTG 86400 PL, and here there is linden and you don't know if it will be ... We'll see.

Are you playing the forum troll or are you trying to spoil your Electrolux ad?

Your analysis is based on what equipment? Because the 4:20 program characterizes washing machines with an electric dryer.

And here I will surprise you because drying in a heat pump dryer takes less time than in a convection dryer

I have nothing against Eletrolux, I have had their washing machine for 7 years, it's OK, no problems.
But I will not agree with the second part of your post - simple matter, I turned on the comparison engine of one of the online stores (I do not know if you can paste foreign links here) and like this:

Bosch WTH8520EPL (heat pump, A ++, 8kg) - program length cotton to the wardrobe 203 min
Bosch WTN86201PL (classic, 8kg, class B) - program length cotton to the cupboard 126 min

Why do you say otherwise?

levy^ wrote:

And here I will surprise you because drying in a heat pump dryer takes less time than in a convection dryer

About half a year ago I made such a comparison based on the instructions for the devices and it turned out that the pump dries longer.

You rely on what is in the instructions given. I, on the other hand, take into account the times during repairs. I have already managed to save many dryers from scrapping and the time is always much shorter because the electronics select the time depending on the degree of moisture.

Even if a traditional dryer (heater) will dry 3 times shorter, the pump wins anyway because it does not damage clothes so much

A colleague has a dryer with a heat pump. I think Bosch. So far, one repair has cost him PLN 600. Its drying takes longer - in a month I will read the data and provide it.
My tumble dryer does not damage my clothes, this is a myth or a problem with specific dryer models.

This, in my opinion, the destruction of clothes is a terrible nonsense.
I have the impression that in terms of marketing they had to come up with something to sweeten such a long drying process. Here nothing can fool you - the heat pump is not able to generate the temperature of the medium as an ordinary dryer, so they figured out that due to the fact that the new technology dries clothes at 50 ° C, it does not destroy them wonderfully.
I am asking - how did it happen that for a few years engineers from the largest concerns did not come up with a solution to put a resistor / thermostat (anything that would limit the temperature of the heater to emit 50 * C) into a traditional dryer, they only created thousands of devices that destroy clothes ? (sarcasm)
The answer seems obvious - because it would extend the drying process to 4 hours and who would buy it?

I will not convince you of anything. I already had a few dryers and I have a comparison.

It's a pity, because I only write what I think, maybe I'm wrong. I have no experience with dryers, this will be my first one. Write what are your impressions as you had several of them.

No heat pump inventions. The simplest model with the charge we are interested in. For this extension of the warranty. Nowadays it is the only "panacea" for household appliances.

I bought without a heat pump, Bosch BOSCH WTG 86400 PL for PLN 1700. I'm very happy. Interesting facts - the device heats up, both side walls and the back are warm, heats up the room, but not to the extent of discomfort.
When I washed the heat exchanger after 8 drying cycles, I understood why the device with the heat pump will work less and less. There was a whole lot of dust of all kinds.
The dryer itself is very pleasant to interact with, neatly made, does not seem cheesy.

And correctly. Congratulations on your purchase, may it serve as long as possible .

barti44 wrote:

I bought without a heat pump, Bosch BOSCH WTG 86400 PL for PLN 1700. I'm very happy. Interesting facts - the device heats up, both side walls and the back are warm, heats up the room, but not to the extent of discomfort.
When I washed the heat exchanger after 8 drying cycles, I understood why the device with the heat pump will work less and less. There was a whole lot of dust of all kinds.
The dryer itself is very pleasant to interact with, neatly made, does not seem cheesy.

In the condensation exchanger, the exchanger is washed automatically, you only manually clean the air filter of fluff.

fafiks wrote:

In the condensation exchanger, the exchanger is washed automatically, you only manually clean the air filter of fluff.

Definitely?

It is automatic only with the heat pump.

In the case of heat pump dryers, the exchanger is washed automatically, it is a fact. Or rather, its front part only because the rest is still full of water . However, with a normal condenser dryer, it is possible to remove the heat exchanger and thoroughly wash it from any contamination.

And I did measurements of electricity consumption and the amount of dried water.

https://www.elektroda.pl/rtvforum/topic3269746.html

Analytical test:

1975g dry laundry, cotton rather, weight before throwing it into the washing machine.


Condensation drying with heater, AEG Electrolux LAVATHERM 88840 dryer - for reference. It has one motor that drives two fans and a drum, which is 120W. There are two heaters, it seems 1400 and 1000W. At the beginning, two heat up, after reaching the temperature - one.
3682 g wet after centrifugation 1200
2561 g after drying
1121 g of water was dried
time 1:10
electricity consumption 1.7 kWh
1.51 Wh per gram of dried water
16 g of water dried from the washing per minute of drying (drying speed)



the second wash, actually rinsing the same load and drying in a heat pump dryer Electrolux EDH 97980W.
3609 g wet after 1200 centrifugation
2591 after drying.
1018 g of water was dried
time 1:35
1.2 kWh
1.18 Wh per gram of dried water
10.7 g of water dried from the washing per minute of drying (drying speed)


According to the parameters of the instructions, a heat pump dryer should be half as economical than a condensing heater, with the same load. And it is only 20%.

For a dryer with a heater, the ambient temperature and the size of the room where it stands are important.
When it stands in a cold vestibule, it works more efficiently and faster than in a warm, small bathroom. In extreme cases, when the room heats up, it does not work at all.


For a small bathroom in a block of flats - with a heat pump.
For home, laundry, basement, vestibule, porch, vestibule - with a heater.

As for the washing temperature - it was similar in the tested dryers - There is a certain plus of the heater - it can cool the laundry. Not with the heat pump.

NOTE - the Electrolux EDH 97980W heat pump dryer is a fairly old model. It has two motors - one to drive the drum and one to drive the fan. Together they consume 300 W. The heat pump is rotary, but quite low power - probably 500 W nominal. Detecting the humidity of the laundry by testing the conductivity between the front and rear of the drum.
The heat pump Electroluxes sold now have one motor for the fan and the drum, and an inverter and inverter compressor with more power, so they probably have better results - but I didn't measure it.

Condenser dryer with AEG Electrolux LAVATHERM 88840 heater is an even older model, but then it was top and mature, with good thermal insulation (it is not even standard now). It also has a steam generator to refresh and iron clothes (and this is the feature for which it will be with me until my technical death). The ones sold now have not changed technically, but they do not have to be better.
Detecting the moisture content of the laundry by testing the conductivity between the blades and the drum plate.

Maras77, great matching!
One question - you wrote that "For dryers with a heater, the ambient temperature and the size of the room where it stands are important" - why? It seemed to me that with such a simple exchanger it does not matter.

Agree, nice combination, only the cost of the water used for drying remains. It should be emphasized that the given amount of water / minute of drying applies to evaporated water, and not to water collected and used for drying (applies only to a dryer with a heater, of course)

cezaarr wrote:

only the cost of the water used for drying remains.

Condenser dryers with an electric heater and a heat pump do not use water for cooling. Water for cooling is used by washer-dryers (I am not sure if all models are also available).

barti44 wrote:

Maras77, great matching!
One question - you wrote that "For dryers with a heater, the ambient temperature and the size of the room where it stands are important" - why? It seemed to me that with such a simple exchanger it does not matter.

The exchanger in the heater dryer is cooled with ambient air.



The colder it is, the more energy it can receive from the exchanger (water condenses gives off the so-called heat of condensation) and water can be condensed (temperature, dew point, etc.) at the same time.

And if the heater dryer is located in a small room, it will quickly heat the air around itself and will be able to receive less and less heat in the condenser at the same time.

And the heater heats up in the same way, so the shorter the drying time, the less electricity we use and the more efficient drying.

thank you maras77 for the measurements. Good engineering job!
The results are surprising!
And they reassure me - it's good that I chose a condensing one, not a pump.

Although condensing uses 20% more electricity, it can be said to be more economical than the one with a heat pump for at least 6 months a year. Why am I saying that? because the heating season lasts about 6 months and the heat from such a dryer heats the apartment and we will use less heat to heat the house for which we would also have to pay.

The dryer with the pump operates in a closed circuit - the heat generated by the evaporator comes from the cooling of the condenser, which means that it does not generate heat gains. The heat only comes from heating the aggregate, which is part of it.
And just - I thought, and probably the one with the pump, since it consumes 1.2kwh, it gives so much to the environment because the principle of energy conservation must be kept

this would mean that the room with the pump heats up slightly less than the condensing one. I think right? that is, all the advantages of the advertising of pump-dryers become only advantages on paper

Arbiter wrote:

And just - I thought, and probably the one with the pump, since it consumes 1.2kwh, it gives so much to the environment because the principle of energy conservation must be kept

this would mean that the room with the pump heats up slightly less than the condensing one. I think right? that is, all the advantages of the advertising of pump-dryers become only advantages on paper

It is more or less like that - with a heat pump it is the equivalent of a farelka in 1st gear placed in the room, and a silky one - more than a farelka in 2nd gear.
In addition, the heater dries shorter, so heating the room is more intense.

@ maras77 What power are you thinking of?
My dryer (with electric heater) uses an average of 1.62 kWh for the entire drying cycle, usually up to 90 minutes.

freebsd wrote:

@ maras77 What power are you thinking of?
My dryer (with electric heater) uses an average of 1.62 kWh for the entire drying cycle, usually up to 90 minutes.

My heater starts at 2.5kW, then goes down to 1.5kW, and finally cools 120W. And it usually dries faster than 90 minutes.

With a heat pump it starts at 600W and increases to 900W as it heats up.

Hello, I need a clothes dryer, I read about the heat pump, maybe I will take a chance with the classic one, because opinions differ, is this Elektrolux EDP12074PDW worth buying?

Estor:

Apart from energy consumption, I still think that a classic dryer (without a heat pump) is a much better choice:

a) lower cost of purchasing the device
b) lower failure rate (less complicated dryer system)
c) easy cleaning of the exchanger (which translates into its efficient operation)

Does anyone know this electrolux? It has a lot of good reviews in stores, but with opinions differently