andy97

iTrader: (1)

How do you find the humidity control with MHVR? I know you can vary the levels and even use CO2 sensors to enhance control of humidity

I'm installing myself whilst all rooms are just stud-work, Floor joists are 'Pozi Joists' so open to having piping. Looking forward to the job, prefer the techy type projects. Next will be LAN throughout. .

ALi-B

iTrader: (1)

Its radial ducted with a xpelair Vent Axia kinetic high-flow (I wanted a Zehnder q600 but It was going to require more work to fit as its dimensions are slightly larger, plus it’s a lot more money).

Early days as I only have one partly functioning bathroom (shower cubical was only fitted this week! ) Humidity sensors are a bit hair -trigger to be honest. Set at the default 70% (no idea if that’s actual humidity, relative or just an arbitrary percentage), its very lethargic to respond. 60% however makes respond to the slightest sneeze! I’ve settled on 64% at the moment as that seems to give a good balance. There is no control of ramp rate from normal seed to boost speed. I’m experimenting with ducting the tumble dryer into it via a inline filter to stop the fluff and extract what would otherwise be wasted heat with mixed results (should have ran an extra duct for it...long term I’ll replace with a heat pump dryer but as it’s a Miele its worth too much to discard it just yet).

I pre-wired for manual momentary-press boost switches that are in the bathrooms and kitchen that activate a timed boost, but this could easily be swapped to occupancy sensors or a home automation wifi relay triggered by a IFTT command based on networked air-quality sensors. I think this maybe the way forward with controlling the system rather than the inbuilt controls as they are not as featured/controllable as I would prefer: But there are plenty of auxiliary input and output options which I hope to utilise speed control based on outdoor indoor temps and seasonal variations...for example you would probably want more airflow in summer at night to keep the house cool (evening/night purge can do this but its strictly time based not temperature based), but in winter you want less on a cold night to prevent excessive heat loss and more airflow during the day when ambient temps are higher; There is no inbuilt way of doing this.

Im having similar issues with the heat pumps weather compensation...I feel I’d get better efficiency during winter if it slightly overheated the house on a milder day and under heated a little on a cold night, using the houses thermal mass (and buffer water tank) to better advantage, but that’s a much more complex job...turns out the weather curves are totally manual and fixed...there is no learning or self adaption, which is a bit crap as Honeywell could do this 20yrs ago! And IVT as well as their agents prefer the system set a static setting 24/7! Surely logic would dictate it would be more efficient to limit operation when its -5c outside to only essential heating, and operate it more intensely when its milder outside!?

House already stuffed with LAN cables! That was the easy bit

andy97

iTrader: (1)

My system is Ventaxia radial design, I think the humidity is set a 60% from factory. I have 4 momentary switches for bathrooms/toilets and I'll wire up via extra input for cooker hood for boost too.

The hysteresis of underfloor heating systems is always an issue, but I do much prefer warm even temperature under foot, We have it on timer and just boost when it ever feels a bit cold

ALi-B

iTrader: (1)

Sorry it is Vent Axia. So probably same controls as yours, factory humidity is 70%, speeds are 20% low, 30% normal, 50% Boost. There is also a cooker hood mode connection hidden away that’ll put the extract fan onto 100%. It wouldn’t take too much in terms of wiring to activate each mode using home automation.

Noise levels needs tweaking, despite reassurances I was told 500mm x 200mm duct silencers would be sufficient. IMO they aren’t, above 30% is too noisy for my likening (near silence is achieved at approx 22%). So I will swap them for 1000mm silencers and put addition silencing material in the spigot plenums. But it is a very very quiet house (accoustic material between floors and walls), so this does make it more noticeable

andy97

iTrader: (1)

I'd heard that the system needs to be setup as per building regs, but then folk turn down the speeds a tad to make them near silent. The darn thing is pretty quiet out of the box, something like 35db at normal speed

Mine turned up today, so Monday's job

ALi-B

iTrader: (1)

Yep, it’s been ‘commissioned’ in the loosest sense of the word; in order to get the certificate and also the 5% vat on cost of the unit, the supply, second fix and commission had to be done by a MVHR guy. Vents are all adjusted for balanced flow rates in each room as per regs. But as building works were incomplete (no floors!) it will need further tweaking.

In the end of the day you just need to ensure the house gets enough air changes per day, how you achieve that within a 24hr window is up to you. There’s no need for it to run at normal speed at night when its cold outside where even with heat recovery you will still loose heat: Today it’s 0 outside..room temps about 20c, supply air temp 15c although anti frost is active so the supply fan is on minimum (something to be aware of if you have open fire or room vented gas appliance) the house loosing 5 degrees via the ventilation, however that’s a massive improvement to having an open window or leaving the trickle vents open (all trickle vents are sealed now).

andy97

iTrader: (1)

Ta for the advice re anti frost. Id seen the summer bypass mode, which I thought was a neat half way to aircon solution, but the flip side is winter where you dont want to drawing in too much cold air. I suppose thats where the additional inline heater unit kicks in.

andy97

iTrader: (1)

Our Teslas received the latest update last night. The update brought greater range, enhanced one pedal driving and more performance, a few other entertainment additions.

Driving this morning the car is even more smooth in acceleration and deceleration, regen braking is much stronger pulling the speed down more rapidly. The performance has been increased by 5% on acceleration, certainly feels more eager to race up to 60mph. Extra performance with increased range

Edit Looks like Tesla is bringing model Y manufacturing to germany BMW aren't gong to like that

andy97

iTrader: (1)

Ultra fine particles from ICE damaging every cell in humans and every other species

https://www.theguardian.com/environm...n-new-research

dpb

More likely to be struck down by silent electric car I suspect


Seen 3 tesla in the 3 days I’ve been here in Melbourne suburbs

BMWhere?

Did you not bother to read the link in my earlier post?
UFPs from brakes, tyres and road wear dwarfs the amount produced by diesels and even more so petrol vehicles. All vehicles, including EVs are responsible for the majority of traffic related UFPs!

andy97

iTrader: (1)

Model 3 only started arriving in Australia last month. To see some already is good news, deliveries will begin to pick up pace in coming months.

Model 3 is a fantastic vehicle, practical, fast, safe and zero emissions whilst driving. I can see them being extremely popular in Melbourne, Sydney and other cities

andy97

iTrader: (1)

EVs hardly use brakes, I only brake in the last 5 yards to come to a stop in my Tesla and hardly ever touch the brakes in the Leaf because it has fully 'one pedal' driving. EVs are not the major brake dust emitters

BMWhere?

I barely brake either, that's my driving style.
I'm not an expert on one pedal driving, but is it not possible that depending on pedal position the brakes may still be applied even though you're not pressing the brake pedal?
EV's still have tyres and still drive on the road and are also heavier than equivalent sized ICE vehicles, so tyre and road wear will be greater! Due to the extra weight, even if you generally brake less, there is more mass to stop, so the brakes will have to work harder too!
So, sorry to burst your smug EV bubble, but your EV's are still responsible for a significant amount of traffic related UFP's even if it is marginally better than a petrol car!

andy97

iTrader: (1)

Im telling you from a personal point of driving EV, you dont hardly ever touch the brakes. The Electric motor regen is that strong it pulls speed down nearly as quickly as braking in a ICE. I touch the brakes just in the last few yards, by then Im doing 5-10 mph. Its known EV brakes lasting towards 100,000 miles before needing changing. One pedal driving does it the same, only in the last few yards the car automatically engages brakes to bring the car to a stop. EVs dont wear out brakes anything like the same rate as ICE. So my point is valid. Regarding tear wear, again on the Leaf, which is coming up 35000 miles its tyres on the front are about 60% worn. So I would dispute accelerated wear. The smoothness of acceleration and deceleration probably contribute to lower tyre wear, as long as the driver isnt slinging the car around corners.

But EV drivers care about the environment and accordingly drive steadily, well that's the micky take from ICE users

BMWhere?

Tyre wear and road wear account for over 60% of fine particulates, even if your brake wear was zero, which it is not, and the extra weight of an EV had zero impact on tyre and road wear, which it doesn't, you're still producing >60% of fine particulates!

BMWhere?

https://www.bbc.com/news/science-environment-49759626

Another (not so) green triumph for EVs

andy97

iTrader: (1)

Like oil rigs now then

BMWhere?

Similar yes, but oil rigs drill a small hole and don't churn up the entire seabed! I would liken it more to bottom trawling!

andy97

iTrader: (1)

What they do,do is **** crude oil out in slicks hundreds of miles long killing millions of sea creatures.

I really don't understand your reluctance to accept EVs are far superior to ICE. , They may not be perfect but are a darn sight better. When something even better comes along we will move onto that.

To not accept that using an ICE for local journeys as terribly polluting the atmosphere is luddite in thinking.

I predict and I'm pretty good at spotting a good idea-TaDa

EV's will be extremely popular

BMWhere?

I'm not a climate change denier and I'm under no illusion that ICE vehicles are bad and need to be replaced, but I accept EVs for what they are! Yes they will be popular and they will improve air quality in inner cities, but they won't save the environment! I'm not against EVs per say, I just take a more realistic viewpoint that they are not some sort of miracle cure for global warming. My greatest fear is that we push EVs so much that we stop looking for better solutions. Governments, the media and many people have a sort of tunnel vision when it comes to EV's and they only focus on one thing! From an environmental point, Hydrogen is already a better solution and if the same effort was put into Hydrogen vehicle development as EVs, we'd be heading in the right direction. There may be other viable solutions around the corner which could be even better!

Ultimately though, when it comes to climate change, we're really focusing on the wrong things. All road traffic accounts for just around 1% of human produced CO2, of which the majority is from trucks, so even if we all switched to 100% CO2 free road transport, nothing is going to change! Air travel is a much bigger problem, but still only limited levels of savings. Global shipping is by far the worst cause of transport related pollution. Ships burn the absolute dregs of the oil based fuel producing the most pollution. Just 15 of the largest container ships produce as much CO2 as all the private vehicle usage in the world! International shipping is currently excluded from all the climate agreements, so nobody is accountable for all the CO2 produced by international shipping and almost nothing is being done to improve shipping efficiency - its a classic case of "not my problem"! Even worse than shipping is the production of cement for the building industry. We build so much out of concrete and bricks that could be built using other less damaging materials. Then there is deforestation which is removing the Earths natural ability to recycle CO2. Forget ICEs vs EVs, it really makes so little difference, we need a wholesale change to the way we live and the global economy if we want to save the environment.

So yeah, its not an argument that ICEs are somehow good, they are not, but they are also not the greatest evil and EVs are no panacea. Nothing against people buying EVs, I only have a problem with the smug, holier than thou, attitude that many EV owners have criticising me for still owning an ICE sports car while they have completely misunderstood the greater problem! I'm doing my bit for the environment in a considered fact based way looking at the whole picture and not just jumping on the EV bandwagon like some kind of sheep!

What am I doing?
- reduced private travelling, especially involving flying.
- cut business trips by using more video conferencing
- cycling to work as much as possible
- moving closer to work so I can cycle more and drive less
- building a new house out of wood (not bricks or concrete) with 60% less energy needs than the average house
- 100% of my electricity will by generated by solar power and the excess supplied to the grid
- Reduced my plastic usage by 3/4 over the last few years
- Buying local products as much as possible and trying to stick to seasonal fruit and veg
- Cooking all meals from scratch, not using packaged products
- reduced meat consumption
- avoid all products containing palm oil
- stopped drinking soft drinks.
- always travel with a refillable water bottle rather than buying bottled water

coupe_20vt

iTrader: (2)

So you'd be happy to replace oil rigs with seabed mining?

andy97

iTrader: (1)

I dont know enough to make an informed comment on the theory of cobalt mining on the seabed. The idea I understand has been researched for decades, but technology hasn't been available to explore the possibility of how it would work.

lozgti1

per se

The whole thing is bollocks

Markyscoob

The only time we use the brakes on our Leaf is when the battery is full. You can't regen into a full battery so it simply doesn't slow down! Quite a shock at first as we live up a hill. Don't think we could afford a Tesla with all our kids. Would if I could.

dpb

Well that's one way saving the planet I guess

andy97

iTrader: (1)

Tesla begin their roll-out of 250 kW chargers in the UK. first site in London

What that means is the ability to charge a battery at over 1000 miles an hour

dpb

Not that much use in Yorkshire

IdonthaveaScooby

1-100 percent take up in 15 years

knee jerk reaction !

ALi-B

iTrader: (1)

Well if they ban petrol/diesel looks like I’ll have to convert to wood gas and bung a gasifier on the roof rack

The WVO lister CHP plan is starting to look appealing...relying on the national grid for everything from power, heat AND transport just feels like i’m putting all of my eggs into the same basket