Still getting condensation three weeks after PIV installed

Effician

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Ben1989 said:

That's way too much condensation. Turn it to max. I know it's cold but close your doors. My house doesn't get that cold just on the landing.

Not only will it be freezing, it will be noisy too. 

Plus you would have to heat 250m3 of freezing air every hour just to see it squeezed out of any gap to the outside, i guess some folks just turn up their heating to counter this.

Yes, if the condensation problem was remedied, I'd be OK with it, but it's not. I'll give it a week or two and if no improvement, I'm going to uninstall it! 

If condensation is predominately on the windows you may want to see why the internal panes are dropping below dew point, once you understand that then a solution should be easier to find.

We found by blocking the trickle vents & introducing circulating fans our condensation issue reduced dramatically, the reason being we had ( even with ventilation)limited air movement in the house in the areas it was needed & the trickle vents cooling effect on the internal panes dropped the temps well below dew point  even with low humidity.

Lots of different scenarios for many types of homes & unfortunately it's not a one size fits all.

We don't have trickle vents. 

So why are your inner panes dropping below the dew point , this is your house not mine so things will be different . You say 65% RH but at what temp ? , humidity in this context is relative & changes with air temp & pressure.

Doubleshotdamo

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Ben1989 said:

That's way too much condensation. Turn it to max. I know it's cold but close your doors. My house doesn't get that cold just on the landing.

Not only will it be freezing, it will be noisy too. 

Plus you would have to heat 250m3 of freezing air every hour just to see it squeezed out of any gap to the outside, i guess some folks just turn up their heating to counter this.

Yes, if the condensation problem was remedied, I'd be OK with it, but it's not. I'll give it a week or two and if no improvement, I'm going to uninstall it! 

If condensation is predominately on the windows you may want to see why the internal panes are dropping below dew point, once you understand that then a solution should be easier to find.

We found by blocking the trickle vents & introducing circulating fans our condensation issue reduced dramatically, the reason being we had ( even with ventilation)limited air movement in the house in the areas it was needed & the trickle vents cooling effect on the internal panes dropped the temps well below dew point  even with low humidity.

Lots of different scenarios for many types of homes & unfortunately it's not a one size fits all.

We don't have trickle vents. 

So why are your inner panes dropping below the dew point , this is your house not mine so things will be different . You say 65% RH but at what temp ? , humidity in this context is relative & changes with air temp & pressure.

Surely inner panes will get cold regardless? It's only a layer of gas between the two panes. Temperature in the bedroom when I went to bed last night was 17.9c

Doubleshotdamo

The dew point with rh at 65% and temp at 17.9c would be 11.2c. It got down to - 3c last night so stands to reason the inner pane will be below the dew point. 

Effician

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Ben1989 said:

That's way too much condensation. Turn it to max. I know it's cold but close your doors. My house doesn't get that cold just on the landing.

Not only will it be freezing, it will be noisy too. 

Plus you would have to heat 250m3 of freezing air every hour just to see it squeezed out of any gap to the outside, i guess some folks just turn up their heating to counter this.

Yes, if the condensation problem was remedied, I'd be OK with it, but it's not. I'll give it a week or two and if no improvement, I'm going to uninstall it! 

If condensation is predominately on the windows you may want to see why the internal panes are dropping below dew point, once you understand that then a solution should be easier to find.

We found by blocking the trickle vents & introducing circulating fans our condensation issue reduced dramatically, the reason being we had ( even with ventilation)limited air movement in the house in the areas it was needed & the trickle vents cooling effect on the internal panes dropped the temps well below dew point  even with low humidity.

Lots of different scenarios for many types of homes & unfortunately it's not a one size fits all.

We don't have trickle vents. 

So why are your inner panes dropping below the dew point , this is your house not mine so things will be different . You say 65% RH but at what temp ? , humidity in this context is relative & changes with air temp & pressure.

Surely inner panes will get cold regardless? . Temperature in the bedroom when I went to bed last night was 17.9c

So 17.9c & 65% RH will give a dew point of 11.2c, if your theory that It's only a layer of gas between the two panes how come others seem to suffer with less condensation.  

If there is 17.9c room temp airflow over the pane surface it will stay above dew temp, also with better thermal properties there will be less heat loss through better sealed units so more likely to stay closer to room temp & above dew point.

A RH calculator can come in handy  https://www.calculator.net/dew-point-calculator.html?airtemperature=17.9&airtemperatureunit=celsius&humidity=65&dewpoint=&dewpointunit=celsius&x=96&y=14

Doubleshotdamo

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Ben1989 said:

That's way too much condensation. Turn it to max. I know it's cold but close your doors. My house doesn't get that cold just on the landing.

Not only will it be freezing, it will be noisy too. 

Plus you would have to heat 250m3 of freezing air every hour just to see it squeezed out of any gap to the outside, i guess some folks just turn up their heating to counter this.

Yes, if the condensation problem was remedied, I'd be OK with it, but it's not. I'll give it a week or two and if no improvement, I'm going to uninstall it! 

If condensation is predominately on the windows you may want to see why the internal panes are dropping below dew point, once you understand that then a solution should be easier to find.

We found by blocking the trickle vents & introducing circulating fans our condensation issue reduced dramatically, the reason being we had ( even with ventilation)limited air movement in the house in the areas it was needed & the trickle vents cooling effect on the internal panes dropped the temps well below dew point  even with low humidity.

Lots of different scenarios for many types of homes & unfortunately it's not a one size fits all.

We don't have trickle vents. 

So why are your inner panes dropping below the dew point , this is your house not mine so things will be different . You say 65% RH but at what temp ? , humidity in this context is relative & changes with air temp & pressure.

Surely inner panes will get cold regardless? . Temperature in the bedroom when I went to bed last night was 17.9c

So 17.9c & 65% RH will give a dew point of 11.2c, if your theory that It's only a layer of gas between the two panes how come others seem to suffer with less condensation.  

If there is 17.9c room temp airflow over the pane surface it will stay above dew temp, also with better thermal properties there will be less heat loss through better sealed units so more likely to stay closer to room temp & above dew point.

A RH calculator can come in handy  https://www.calculator.net/dew-point-calculator.html?airtemperature=17.9&airtemperatureunit=celsius&humidity=65&dewpoint=&dewpointunit=celsius&x=96&y=14

That's the calculator I used. I bet it's curtains that's causing the problem. No movement of air like you say. 

Ben1989

I'd get a monitor for your RH% and monitor it. I would go full power to see if it improves. If you're not comfortable with the extra cold, then maybe a PIV isn't for you at all.

Effician

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Effician said:

Doubleshotdamo said:

Ben1989 said:

That's way too much condensation. Turn it to max. I know it's cold but close your doors. My house doesn't get that cold just on the landing.

Not only will it be freezing, it will be noisy too. 

Plus you would have to heat 250m3 of freezing air every hour just to see it squeezed out of any gap to the outside, i guess some folks just turn up their heating to counter this.

Yes, if the condensation problem was remedied, I'd be OK with it, but it's not. I'll give it a week or two and if no improvement, I'm going to uninstall it! 

If condensation is predominately on the windows you may want to see why the internal panes are dropping below dew point, once you understand that then a solution should be easier to find.

We found by blocking the trickle vents & introducing circulating fans our condensation issue reduced dramatically, the reason being we had ( even with ventilation)limited air movement in the house in the areas it was needed & the trickle vents cooling effect on the internal panes dropped the temps well below dew point  even with low humidity.

Lots of different scenarios for many types of homes & unfortunately it's not a one size fits all.

We don't have trickle vents. 

So why are your inner panes dropping below the dew point , this is your house not mine so things will be different . You say 65% RH but at what temp ? , humidity in this context is relative & changes with air temp & pressure.

Surely inner panes will get cold regardless? . Temperature in the bedroom when I went to bed last night was 17.9c

So 17.9c & 65% RH will give a dew point of 11.2c, if your theory that It's only a layer of gas between the two panes how come others seem to suffer with less condensation.  

If there is 17.9c room temp airflow over the pane surface it will stay above dew temp, also with better thermal properties there will be less heat loss through better sealed units so more likely to stay closer to room temp & above dew point.

A RH calculator can come in handy  https://www.calculator.net/dew-point-calculator.html?airtemperature=17.9&airtemperatureunit=celsius&humidity=65&dewpoint=&dewpointunit=celsius&x=96&y=14

That's the calculator I used. I bet it's curtains that's causing the problem. No movement of air like you say. 

It certainly isn't always as easy as reading reviews & throwing money at something believing it should work, some get lucky & it works first time some of us though have to think a bit more outside the box to find a solution.

Here's a thought,  where does the pressurised air pumped from the loft actually exit the building? if you had trickle vents would the pumped air be more likely to exit at the top of each window frame therefore causing warmer air to be pushed across the panes before exiting outside.

locky123

Does the central heating stay on over night at a set back temp or does it go fully off until early morning?

Doubleshotdamo

locky123 said:

Does the central heating stay on over night at a set back temp or does it go fully off until early morning?

I switch the CH off at night. There was condensation forming early evening. 

locky123

I dont know the insulation levels in your property but the inside room temp will be dropping from 18 when you go to bed before midnight with heating fully off and may well be 12-14 deg C early morning. Window surfaces will be less especially behind curtains, which means their reaching dew point. Only guaranteed cure is to reduce condensation is to raise room temp. Perhaps a dehumidifier may help. Perhaps a room stat with set back night temp. Either will consume more energy. North facing sides tend to get more condensation in our property and condensation was bad on them this morning similar to your photo.