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27 posts

Geek
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Topic # 240260 29-Aug-2018 16:11
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HRV means Heat Recovery Ventilation

 

(remember ventilation means removing stale, humid air)

 

 

As far as I have been able to find out, there is only one New Zealand company that manufactures a true HRV system and it is not HRV (hrv.co.nz). It is Cleanaire or AVON Electric based in Christchurch. (http://www.cleanaire.co.nz/)

 

 

There is great confusion in this country about what constitutes a true HRV. I'm sure many of you already know this but thought an explanation would be good to know for some.

 

 

A true HRV system: -

 

 

1.) Brings in FRESH outside air

 

2.) Filters out dust.

 

3.) Passes the air through a heat exchanger which warms it (see 4.) so cold air is not blown into the house. This saves energy.

 

4.) The warm, stale, humid air in the house is drawn out and passes through the heat exchanger so its heat is not expelled from the house, just the stale, humid air.

 

5.) Any excess condensation is drained from the main unit.

 

6.) The whole main unit and all ducting is insulated.

 

7.) The heat exchanger is metal, not one of those absurd cardboard ones DVS uses. Think about it and heat transfer????

 

8.) Two separate, large, quiet fans - one for intake and one for expelling.

 

9.) In vents in lounge/dining bedrooms with warmed fresh air. The vents are by the windows so full cross ventilation happens not like "hrv.co.nz" whose vent are by the door??? Come on basic ventilation. Again a joke.

 

10.) Out vents in kitchen, laundry and bath/shower room so the moisture is removed BUT not the heat and again cross ventilation happens.

 

 

See animated diagram:

 

http://www.cleanaire.co.nz/why_a_cleanaire/What+does+a+HRV+do.html

 

 

Works best with a Heat Pump ( heat in winter, cool in summer) and ceiling, wall and floor insulation in the house.

 

Note: Yes even the concrete slab floors should be insulated as they act as a heat or cool store depending on season.

 

 

Works in reverse in the summer so the cooled aircon air cools the incoming fresh air, again saving energy.

 

A heat exchanger is just that a heat exchanger so it doesn't care from where the hot or cold is coming from.

 

Here in Hawke's Bay in the summer we shut the aircon off at night as we have cool evenings even after 30 degree plus day time temperatures. The HRV blows the cool, fresh evening outside air around the house so we sleep well.

 

 

Benefits:

 

1.) Constant fresh air brought into house 24/7 - we never open our windows which is good for security .

 

2.) No condensation what so ever. Even on the window aluminium frames - not double glazed yet - that's next!

 

3.) The heat from the kitchen, laundry, bath and shower is recovered and the moisture is removed. Saves money!

 

4.) Since moving into this house over 3 years ago I have not caught a cold or the flu (no shots by the way) and I'm over 65 and asthmatic!

 

5.) We are warm ( or cool) and dry. No mould in house even in bathroom

 

 

Maintenance:

 

1.) Wash heat exchanger with garden hose once a year.

 

2.) Wash air filters once or twice a year.

 

 

I trust this will help clear up some misconceptions.

 

 


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1791 posts

Uber Geek
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  Reply # 2080900 29-Aug-2018 16:39
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Look into Brinks, Nilan or Zehnder systems. They're available in NZ

 

 


91 posts

Master Geek
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  Reply # 2080948 29-Aug-2018 17:08
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Am I missing something?

 

Isn't this what some of the balanced Smart Vent systems do as well?

 

https://smartvent.co.nz/smartvent-synergy-evolve

 

https://smartvent.co.nz/smartvent-balance


864 posts

Ultimate Geek
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  Reply # 2080951 29-Aug-2018 17:11
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evilengineer:

 

Isn't this what some of the balanced Smart Vent systems do as well?

 

https://smartvent.co.nz/smartvent-synergy-evolve

 

https://smartvent.co.nz/smartvent-balance

 

 

Yes its a true HRV.


623 posts

Ultimate Geek
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  Reply # 2081312 30-Aug-2018 12:18
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The DVS Reclaim Balanced Pressure Heat Recovery Ventilation System seems to have a heat exchanger does that qualify?

 

Not that I would touch them with a barge pole, we just brought a house with a basic 2yo DVS system already installed, asked them to quote on a summer kit, you know get fresh air that is not hot from outside the ceiling cavity. $2800. Nope not happening. We will turn the DVS off in summer if it gets too hot.


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Uber Geek
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  Reply # 2081316 30-Aug-2018 12:20
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I believe (haven't looked for a few years) that HRV also offer a proper heat recovery system.

 

We had Smart-vent installed our previous house in Nelson and found the local agent and the product excellent.





Mike

30 posts

Geek
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  Reply # 2081401 30-Aug-2018 14:15
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Add Fantech and Moisture Master to the list



27 posts

Geek
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  Reply # 2081404 30-Aug-2018 14:27
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New Zealand made.

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  Reply # 2081408 30-Aug-2018 14:41
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Advertising plug only?




27 posts

Geek
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  Reply # 2081451 30-Aug-2018 15:46
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Just personal experience to help people make an informed choice. Perhaps reread?

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  Reply # 2081453 30-Aug-2018 15:48
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AACTech: HRV means Heat Recovery Ventilation (remember ventilation means removing stale, humid air)

 

As far as I have been able to find out, there is only one New Zealand company that manufactures a true HRV system and it is not HRV (hrv.co.nz). It is Cleanaire or AVON Electric based in Christchurch. (http://www.cleanaire.co.nz/)

 

That is abysmal research. If I Google "heat recovery ventilation NZ" I find three additional heat exchange systems in the first five search results!

 


1. cleanaire.co.nz

 

2. moistureMASTER

 

3. Smart guide, Ventilation and heat recovery systems, Ministry of Business, Innovation and Employment

 

4. The Heating Company

 

5. Mitsubishi Electric

 

 

 

 

 

P.S. Maybe the trick is the qualifier "manufactures"?




27 posts

Geek
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  Reply # 2081544 30-Aug-2018 17:07
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I sorry if some of you have missed the point. I'm not a prfessional writer so my fault.

 

 

The purpose of the post was simply to explain what a true HRV system is as I've found a lot of misunderstanding and confusion out there. Of course I used the example of the system that came with our house as this is the one I know.

 

 

So again apologies if perhaps I didn't word it carefully enough.

 

 

Cheers all!

 




27 posts

Geek
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  Reply # 2081549 30-Aug-2018 17:11
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" P.S. Maybe the trick is the qualifier "manufactures"?

 

 

Yes that is correct. I like to support local or at least New Zealand companies.

 


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  Reply # 2081647 30-Aug-2018 20:10
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AACTech: Just personal experience to help people make an informed choice. Perhaps reread?

 

I can read. I finished school. I know Avon Electric very well. I hope Colin is still there. But your post seems very advertising-centric which I thought was not allowed here


13189 posts

Uber Geek
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  Reply # 2081648 30-Aug-2018 20:12
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AACTech: " P.S. Maybe the trick is the qualifier "manufactures"? Yes that is correct. I like to support local or at least New Zealand companies.

 

Sorry, but "It is Cleanaire or AVON Electric" and you will know they are the same company.


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  Reply # 2081687 30-Aug-2018 22:06
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HRV is just a brand name like KFC. I don’t believe it reflects any particular system. The company offer a range of products. Shame their sales and marketing tactics are dodgy as. These systems have already been discussed on GZ ad-nauseam. Do we really need another?




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