Bathroom

[sonicboom]

How do you guys manage hot steamy showers - can the mvhr keep up ?

My current extractor pulls 560m3/hour to keep things at bay - any lower and the steam builds up quick. I don't like the idea of the entire house having to run at very high fan speeds because someone is taking a shower - especially if its at night or early morning.

[JohnMo]

8 minutes ago, sonicboom said:

current extractor pulls 560m3/hour

I would doubt it actually does anywhere near that. It may say that on the box, but most intermittent fans are just noise generators. Our last house said that, but when I put some tissue over the inlet it fell off. No suck going on.

 

MVHR, mine very rarely goes in to boost these days, no steam buildup. Even if it does it's gone very quickly.

 

When first installed on a new build we would get the MVHR boost quite often. After first year, almost never goes into boost. 

[sonicboom]

1 hour ago, JohnMo said:

I would doubt it actually does anywhere near that. It may say that on the box, but most intermittent fans are just noise generators. Our last house said that, but when I put some tissue over the inlet it fell off. No suck going on.

 

MVHR, mine very rarely goes in to boost these days, no steam buildup. Even if it does it's gone very quickly.

 

When first installed on a new build we would get the MVHR boost quite often. After first year, almost never goes into boost. 

 

Its a 150mm inline fan and makes the bathroom chilly. You can feel the current of air being pulled from the feet to the torso, so I have no doubt it pulls a lot of air.

 

Interesting, so I guess the humidity is so low in your property then ?

Whats the flow rate for your setup and whats the boost flow ?

[JohnMo]

2 minutes ago, sonicboom said:

Whats the flow rate for your setup and whats the boost flow ?

somewhere around 150m3/hr and boost is 20% above that.

 

Humidity for Dec, longer it spends cold the lower the humidity seems to get, from the 10th the average daily temp has been close to or below zero

 

[Kelvin]

Ours is 170m³/hr and boosts to 25% above that when it detects the  humidity is high. The boost speed isn’t particularly intrusive in the other rooms. Only the extract in the kitchen gets slightly louder and it clears the bathrooms very quickly. The shape of our humidity graph is similar to @JohnMo

[sonicboom]

Thanks. So what is the floor area (m2) of your properties ? I was expecting the boost to need to be much higher than that - a little stumped. Some more questions if you guys don't mind:

 

1. Where is the bathroom extractor located (middle of the room, where the bath is) ?

2. Is it on the wall or ceiling ?

3. What is the diameter of the extractor ?

4. What type of grille are you using ?

5. What mvhr unit are you using ?

Edited Friday at 15:51 by sonicboom

[JohnMo]

My total area is 192m²

 

Original flow rate was set per building regs, then after sign off reduced to closer passivhaus flow rates. Best guide I came across attached below.

 

12 minutes ago, sonicboom said:

1. Where is the bathroom extractor located (middle of the room, where the bath is) ?

2. Is it on the wall or ceiling ?

3. What is the diameter of the extractor ?

4. What type of grille are you using ?

5. What mvhr unit are you using ?

1. Above bath, as far from door as possible and opposite side of room to shower.

2. Ceiling - about 2.5m

3. 125mm

4. Big standard adjustable extract terminal 

5 Titan HRV - two times units due to layout.

[sonicboom]

15 minutes ago, JohnMo said:

My total area is 192m²

 

Original flow rate was set per building regs, then after sign off reduced to closer passivhaus flow rates. Best guide I came across attached below.

 

1. Above bath, as far from door as possible and opposite side of room to shower.

2. Ceiling - about 2.5m

3. 125mm

4. Big standard adjustable extract terminal 

5 Titan HRV - two times units due to layout.

That image is excellent, thank you very much for that.

 

The TItan's have an efficiency of about 88% - do you feel coolness as the temp drops to 0c ? This worries me as I like warmth and want as high an efficiency possible. What is your internal temp btw ? and are you running a low temp heating system ?

Edited Friday at 16:24 by sonicboom

[JohnMo]

Don't have any issues with cold blasts of air. Generally air clings to the ceiling and by the time it gets anywhere you feel it's at room temperature.

 

We keep the house between 20 and 21, sometimes a little warmer with solar gain. Bedrooms generally cooler, nearer 18/19. December data below. Currently batch charging the floor at night, and a day or evening top up. All UFH throughout.

 

[sonicboom]

Cool. What tool/gear do you use to monitor the temps ?

and what do you mean by batch charging ? I am assuming you are using ashp, you must be getting some really good COP ratios with UFH. Are you doing UFH on 1st floor too (assuming you have one) ?

[JohnMo]

2 hours ago, sonicboom said:

Cool. What tool/gear do you use to monitor the temps ?

That's a Shelly H&T, within Home Assistant. Shelly own webpage is pretty crude.

 

2 hours ago, sonicboom said:

and what do you mean by batch charging

Batch charging is using the floor as storage heater, in basic terms.  Charging the floor similar to storage heater in cheap periods.

 

We are single storey, so no real upstairs.