Watch Us Build a Passive House in New Zealand - Episode 4
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- Опубликовано: 12 сен 2024
- Follow the crew at Compound as they build an energy efficient home to passive house principles. In this 5 part series we will go into minute detail on what it takes to build a house like this in New Zealand.
Treated Floor Area : 146.9m2
Heating Demand kWh (m2a) : 23.9
Heating Load W/m2 : 12.6
Frequency of overheating (+25 'c) % : 1
Airtightness: 0.21 ACH
In this episode we cover our mechanical ventilation heat recovery, Solar energy & Tesla battery. We talk about the considerations when striving for the Passive House standard. How does it feel? What its like to live in a Passive House Low Energy Building and does the level of comfort match what was predicted in the PHPP modelling.
Wicked series! As a recent qualified builder in Auckland it’s super interesting to see the passive build process.
Thanks, Josh. Glad we were able to shed some light on the process!
Auckland is a great climate for Passive House Construction, and it is easier to achieve the standard there.
If you've got the time to do this on more builds, do it! So good to see it all happen.
It was a very interesting series! Thank you for sharing. Also good to see the you guy are starting with passive housing 😊. Many greetings from Freiburg Germany
Thanks Compound! Really appreciate you documenting this process for all us looking into PH in Aotearoa and how we might implement it!
There's lots of great content from the States too, but knowing how much of that can actually be used locally is always a bit of a blocker.
Our pleasure! Glad to hear it was helpful!
Loved to see this come together, stunning work
Thanks Toby! Glad you enjoyed the watch.
Nice work bro, good to see it done, looks amazing.
Ryan and the lads done a good job.🤜🤛
Nice video series fellas!
Thanks Joel!
Hi thanks for taking the time to share your build. Why did you miss out on the passive standard? Cheers
Hi Cam. Modelling showed on PHPP that we would achieve a "Low Energy Building" certification. We are extremely happy with the performance data from using PHPP, and we simple had no budget left to pursue certification (professional fees).
Awesome watch thank you.
Thanks Coryn, Glad you enjoyed it!
Great series and just shows you don't have to meet passive standards to build a super efficient house. What did you use for your walls they look amazing?
Thanks, Caolan!
It’s all about understanding how to build a very energy-efficient home. Implementing all the Passive House principles to the level within the budget for a healthy home.
Ideally, all homes would be to the certified standard, but this isn’t a reality in a market where building costs are soo high. But striving for it should be a priority. :)
The paint is French Wash by Porter’s Paints.
Nice
Veri nais :)😄What did modeling showed about humidity during the summer? And why did you choose hrv instead of erv?
Hi Joe, Great comment! This has me thinking more about ERV vs HRV.
Very low Humidity is predicted in the summer months and a 1% overheating value.
Our climate in Central Otago, New Zealand; the Summers are hot and low in humidity; winter mornings are often misty, the days cloudless and windless and the nights freezing.
We work alongside certified Passive House designers and ventilation specialists in New Zealand, a HRV was specified for the Heat recovery properties.
We find the living environment extremely comfortable. However, I think measuring the humidity going forward will be extremely valuable and we can do a smaller video on our findings.
Thanks for the great perspective.
So good, what's the finish on the interior walls?
Thanks Guys. It’s French Wash, by Porter’s Paints
You mentioned needing heating but what is your heating source? Is it a separate heating from the ERV?
Heating source is 2x 2kw Convection electrical panel heaters. In the coldest days of winter, these regulate the temperature in the early & late hours. However, usually the home sits at between 18-20degrees without heating.
What is the cost of reaching full passive home standard that allows your solar system including panels and battery to be efficient enough to produce net zero energy bill? I would argue it would be easily 200k. The ROI of this is not even close to being economical. Great for the environment but the economical argument does not stack up.
25% mehr als ein herkömmliches neues Haus in Deutschland. 👍🇩🇪
You raise a good point regarding ROI. We are coming up to net zero energy bill for 12months. $30k 5kw solar system with a 14kwh Tesla Powerwall 2 battery. We are still collecting data on this project. It will be great to spreadsheet out the numbers and the returns compounding over the years.
New Zealand insulation, window performance and energy standards for homes have now increased (H1). Inflation has also been rising rapidly since the Covid19 pandemic. So the cost of building a conventional home has increased significantly.
What it cost to build this home, is now what it would cost to build conventionally to the new New Zealand Standards which is significantly less energy efficient than this home.
Power prices are going to only increase as the world becomes more electrically dependant. So your ROI is going to only compound over time.
The goal is to be ahead of the curve and build homes that require little to no energy and promote health and well being to the occupants. E.g No bills, pay off more principal of your mortgage. Once mortgage free, no bills.
Freeing up your cashflow and promoting health is going to create opportunity in itself.
Or you could focus on re-sale and play the game most play, only to realise you could of been better off 10years down the line if you had just committed to building high performance home.
@@compound__ Your comments regarding cost of the passive home vs. a minimum standard home is very misleading. The cost of ALL construction has gone up considerably since you built this home, not just standard construction. Your passive home still costs considerably more to build than a traditional build today, just as it did a couple of years ago.
Lets do some numbers:
Average power bill per year - $3600 ($300pm)
Power wall system - $30K
Cost neutral period - 9 years
Warranty on your power wall - 10years (charging capacity starts to significantly reduce after this)
Let's be generous and estimate your power wall and panels last for 15 years before they need to be replaced. That's $21,600 you've managed to save and put towards your mortgage over 15 years!. You make it sound like your debt free significantly quicker this way. This pitch doesn't mathematically add up.
You would be much better off taking 30k less of construction debt, thus paying significantly reducing the amount of interest you are paying over the life of the loan.
Like I said. Love the idea of a healthy warm home. Do it for comfort and health reasons. But please don't claim it will save you money and allowing you to pay off your mortgage faster. The maths is not even close.
@@compound__ Any updates to the ROI information which can be shared? Used to own a house in J'Ville before heading overseas for work, now considering retiring back in Kiwiland so been looking around and came across your vid.
Would be interesting to compare the details to a friends new build in CHCH as he is slowing relocating from Wlgtn to CHCH and does not want solar nor a passive home.
Thank you in-advance for any your time and advise on the matter!
Whats the house use to heat hot water
STIEBEL ELTRON's hot water heat pump WWK 302|302H
@@compound__ thanks. I saw the heat transfer unit but missed the heat pump hot water system.
I have seen these units advertised in the magazine "Renew". I see now why the plant rooms are so big as the internally fitted heatpump needs a 13 sqm room. 13sqm if indoor. Thats quite a size. 3m x 1.8 x 2.4m. Quite hard to fit in an existing build. For aesthetic appeal dont want outside. 👍
@@Scooter1964NZ It is still possible to fit a split system. Your hot water cylinder remains inside (standard size) and the heat pump unit is external. A more traditionally sized heat pump, so less invasive aesthetically.
Reclaim does a system like this. Follow this link for a read if you like.
enveloped.co.nz/water-heaters.html?gclid=Cj0KCQjwkOqZBhDNARIsAACsbfKPG8WptToZhjCIU6lNXyCsccaPLLmOuM5uEtepYWpLr2e8_7QwhZEaAhvXEALw_wcB
An electronic system? So a normal windowed house is Passive... and this is active...Windows don't require power...what a load of wank.