Heat pump tumble dryer - do they create condensation and how long is a typical program for fully dry

Lorian

I have a Samsung Series 5 heat pump model (couple of years old) and it does not cause any noticeable condensation in the room. I do have the condensate pipe plumbed in to the sink drain rather than using the tank - not sure if that is possible on all models. My old regular condenser caused lots of condensation on the window and door this time of year. It always starts off saying its going to take 3 hours but it never does take that long. I can put the Tapo on it sometime and measure what it uses.

getmore4less

SnakePlissken said:

getmore4less said:

The key for condensation is the condenser efficiency how much of the moisture end up in the tank.

A decent model is around 90% not so good 80% 

That Samsung is 81% not very good.

That is double the moisture released to the room compared to the best.

1.56kWh for a full 9kg load is good

The specs are based on 60% residual moisture after the wash.

 most should have washers that are better than this (spin efficiency not spin speed), this results in lower energy use and faster drying than the specifications.

My guess based on our Grundig real life is the Samsung would do a load under 1kWh.

Thats the new EU standard, my bosch serie  8 dryer is 91%  and thats at the highest end of what you will acheive.
I have glass roof in room and no condensation.

But if boiling on ring lots if i dont close door fully closed, then steamed up roof and window.

The samsung with 81% is a b rating on new standards so not poor as rating is A to G.
Thats like saying A++ is a poor energy rating.

Full standard below..

https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1457088829567&uri=CELEX:32012R0392

And for purpose of OPs question he asked would he get condensation in room, which answer is no.

It's more than double the moisture for the worst B(81) rated against A(91) and 3 times some of the best A around

No HP dryer will be less than C (71-80) if you can find a C rated one it will be high 70%

the A rated bands on like for like(for 9kg
around  
<195kWh A+++
<260kWh A++
<341Kwh A+

A++ uses 30% more energy than just A+++  that's quite poor
A+ is using 75% more energy than the A+++ that's very poor.

Many(most) current machines are just scraping into their ratings.

Qyburn

Why don't heat pump driers recycle the hot air anyway?  Surely that would be better than venting to the room.

getmore4less

Qyburn said:

Why don't heat pump driers recycle the hot air anyway?  Surely that would be better than venting to the room.

What makes you think they pull in room air  and vent all air that has been through the cycle?

SnakePlissken

getmore4less said:

SnakePlissken said:

getmore4less said:

The key for condensation is the condenser efficiency how much of the moisture end up in the tank.

A decent model is around 90% not so good 80% 

That Samsung is 81% not very good.

That is double the moisture released to the room compared to the best.

1.56kWh for a full 9kg load is good

The specs are based on 60% residual moisture after the wash.

 most should have washers that are better than this (spin efficiency not spin speed), this results in lower energy use and faster drying than the specifications.

My guess based on our Grundig real life is the Samsung would do a load under 1kWh.

Thats the new EU standard, my bosch serie  8 dryer is 91%  and thats at the highest end of what you will acheive.
I have glass roof in room and no condensation.

But if boiling on ring lots if i dont close door fully closed, then steamed up roof and window.

The samsung with 81% is a b rating on new standards so not poor as rating is A to G.
Thats like saying A++ is a poor energy rating.

Full standard below..

https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1457088829567&uri=CELEX:32012R0392

And for purpose of OPs question he asked would he get condensation in room, which answer is no.

It's more than double the moisture for the worst B(81) rated against A(91) and 3 times some of the best A around

No HP dryer will be less than C (71-80) if you can find a C rated one it will be high 70%

the A rated bands on like for like(for 9kg
around  
<195kWh A+++
<260kWh A++
<341Kwh A+

A++ uses 30% more energy than just A+++  that's quite poor
A+ is using 75% more energy than the A+++ that's very poor.

Many(most) current machines are just scraping into their ratings.

Perhaps someone who owns a B rated dryer can comment  on if they experience condensation or not.

The horses mooth is always the best place tae get an awswer fae.

SnakePlissken

Qyburn said:

Why don't heat pump driers recycle the hot air anyway?  Surely that would be better than venting to the room.

Heatpump dryers kinda do that..

"What is a heat pump tumble dryer?
A heat pump tumble dryer absorbs the water from your laundry by passing hot air through the drum. This air then goes through an evaporator which removes the water and stores it in the tumble dryers’ reservoir. This air is then reheated and sent back through the drum multiple times until your laundry is dry.
This works considerably different to vented and condenser tumble dryers, as in both instances they do not take advantage of the air they have already warmed. Heat pump tumble dryers will use considerably less energy, as they are reheating the same air, which is already warm from the previous cycle."

https://www.stellisonselectrical.co.uk/blog/post/what-is-a-heat-pump-tumble-dryer#:~:text=A heat pump tumble dryer absorbs the water from your,until your laundry is dry.

As Bosch heat pump dryers expel little hot air into their surroundings and have a condensation unit to store extracted moisture, there’s no need for an exhaust hose to be installed. This means that you can place them anywhere in your laundry room, basement or kitchen — even under countertops or in a laundry cupboard.

https://www.bosch-home.in.th/en/experience-bosch/living-with-bosch/fresh-reads/6-reasons-why-you-need-a-bosch-heat-pump-dryer-in-your-life#:~:text=Unlike vented dryers and condenser,electricity than other dryer types.

Alnat1

If you dry another load straight after the first, the dryer is already warm and uses even less electricity 

Lorian

I'll put my temperature and humidity recorder next to the Samsung next time we do a dry and we'll have some real world stats.

It too has no air vent.

Qyburn

getmore4less said:

Qyburn said:

Why don't heat pump driers recycle the hot air anyway?  Surely that would be better than venting to the room.

What makes you think they pull in room air  and vent all air that has been through the cycle?

I must admit I'd always assumed they recycled. But if they don't vent to the room then why the concern about condensation?

Rheumatoid

I'm thinking about getting a heat pump drier but it would need to go in the garage and mainly be used in the cold months. Does this have any impact on their efficiency?