Hot feed for washing machine

[JohnMo]

Sorry to throw a spanner in the works.

 

A heat pump dryer does not take or give air to the room. It a self contained system.

 

Look here for a simple explanation 

https://goclean.masscec.com/article/how-heat-pump-clothes-dryers-work/

[JohnMo]

43 minutes ago, LnP said:

The guy in the linked YouTube video isn't a fan of HP dryers and agrees with what @Nickfromwales says about drying times ...  link.

Watched the video to the half way point, sorry it's rubbish. He really has no idea how the heat pump side works. Testing with a dry drum is nonsense. The moist air condensing will be playing a major role.

[Nickfromwales]

51 minutes ago, LnP said:

I know a lot more about tumble dryers now 😀.

We knew this day would come......

[Dave Jones]

1 hour ago, Nickfromwales said:

Gutted. I’d have bought one without hesitation but all of the manufacturers literature put me right off. Some saying 4 hour cycles. 

 

it helps that the 'outide' air the dryer is using to drive the heatpump is allways around 21 so its not working hard. asked the mrs and she said a full load of towels is an hour tops.

[JohnMo]

26 minutes ago, Dave Jones said:

 

it helps that the 'outide' air the dryer is using to drive the heatpump is allways around 21 so its not working hard. asked the mrs and she said a full load of towels is an hour tops.

Outside the dryer air isn't used on the cycle at all, once you close the door. Not sure where @jack gets the interaction with room air?

 

 

[JohnMo]

1 hour ago, LnP said:

. If your tumble dryer has a 2.5 kW heater, all the 2.5 kW ends up in your house 

 

I know a lot more about tumble dryers now 😀.

Not sure you do know a lot more? Our HP dryer adds almost no heat to the room, a little radiated from the door but not much. 2.5kW is enough to heat the whole house at about -4 degs. Room temp would be about 50 degs if the dryer worked as described up thread.

[LnP]

48 minutes ago, JohnMo said:

Not sure you do know a lot more? Our HP dryer adds almost no heat to the room, a little radiated from the door but not much. 2.5kW is enough to heat the whole house at about -4 degs. Room temp would be about 50 degs if the dryer worked as described up thread.

Well, I think I know that you didn't read my post. I was talking about condenser dryers. The ~ 2.5 kW heat from a condenser dryer all ends up in the room .... well tbh all the heat from your heat pump dryer's compressor motor ends up in your room as well, however much that is 😉.

[LnP]

1 hour ago, JohnMo said:

Outside the dryer air isn't used on the cycle at all, once you close the door. Not sure where @jack gets the interaction with room air?

Catch up! He was talking about condenser dryers 😀. ... about which I didn't know much until this voyage of discovery.

Edited Monday at 19:02 by LnP

[SteamyTea]

I had a condensing washer dryer, can't remember if it was a Hotpoint or a Candy, but I seem to remember that it used the cold water feed to condense the moist air.

[jack]

2 hours ago, JohnMo said:

Outside the dryer air isn't used on the cycle at all, once you close the door. Not sure where @jack gets the interaction with room air?

 

I was talking about ordinary condenser dryers (like the one I have), not heat pump condenser dryers. Non heat pump versions definitely use room air to cool the condenser: 

 

[sharpener]

17 hours ago, SteamyTea said:

I had a condensing washer dryer, can't remember if it was a Hotpoint or a Candy, but I seem to remember that it used the cold water feed to condense the moist air.

 

Yes there was an intermittent feed that sprayed cold water into the air circuit. Brought the circulating air down to the temp of the cold water inlet but also ensured it was 100% saturated. Next to useless, worst machine I ever owned.