Heat pumps. Any negative points about 3 phase?

[JohnMo]

7 minutes ago, Barnboy said:

outside humidity has been between 70% and 100%

But when air is heated the dew point moves. We have a heated summer house it has dMEV fan, humidity inside hasn't been above 40% for that last month. We have bearly had a dry sunny day in the last month humidity outside closer to 100% most the time.

 

Are you heating the house?

[Barnboy]

13 hours ago, JohnMo said:

Change the trickle vents to humidity activated one, but only in dry rooms (bedroom, living room etc).  Seal up any in wet rooms

https://www.ironmongerydirect.co.uk/product/trimvent-xr16-upvctimber-window-vent-recessed-352-x-16mm-white-906766

I think that these are the trickle vents that we have, I've looked and can't seem to find a  humidity controlled replacement, I think that they are the cheapest the Joinery company could be bothered to find.

[Barnboy]

Only source of heat is from body, cooking and showering.

[JohnMo]

11 minutes ago, Barnboy said:

Only source of heat is from body, cooking and showering.

There's your second issue, not just ventilation, no heating.

[JohnMo]

13 minutes ago, Barnboy said:

https://www.ironmongerydirect.co.uk/product/trimvent-xr16-upvctimber-window-vent-recessed-352-x-16mm-white-906766

I think that these are the trickle vents that we have, I've looked and can't seem to find a  humidity controlled replacement, I think that they are the cheapest the Joinery company could be bothered to find.

First hit in Google

https://www.bpdstore.co.uk/glidevale-energy-saver-humidity-sensitive-trickle-ventilator/p/182

[Barnboy]

9 hours ago, JohnMo said:

First hit in Google

https://www.bpdstore.co.uk/glidevale-energy-saver-humidity-sensitive-trickle-ventilator/p/182

I've already looked at these, they're too long. If they would fit over the recess left from mine they still wouldn't fit as I had to make a recess to be able to get enough insulation into the reveal.

[JohnMo]

These are 402mm long

https://www.shop24glasgow.co.uk/en/windows-accessories/836-manual-trickle-vent-vt600.html

 

 

[Nickfromwales]

So, 3ph heat pumps, back on topic folks!!!!!

[saveasteading]

10 hours ago, Nickfromwales said:

, 3ph heat pumps, back on topic folks!

It's been an interesting detour. 

But back to the early responses. My hunch is still that 3 phase would be the less complex "go to", rather than very clever, but complex, inverters from single ph to dc then to 3 ph which must carry some cost and increased fault risk.

 

[Nickfromwales]

41 minutes ago, saveasteading said:

It's been an interesting detour. 

Yes, but the fleas come with the dog, lol.