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Topic # 14044 12-Jun-2007 20:16
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Can anyone tell me the difference between a DVS & HRV system?  Both seem to do the same thing.  And why did aircon get rebranded as heatpumps?




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  Reply # 74432 12-Jun-2007 20:19
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Sorry but I am not sure, but would be very interested to know the difference between the two companies.

AFAIK Aircon is a form of Heat pump. Link

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  Reply # 74442 12-Jun-2007 21:19
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We have a Weiss home ventilation system (www.weiss.co.nz) which is around $1250 before installation (it cost us $1850 installed). Does the same thing as a DVS and HRV. It is great for eliminating moisture from the house (no condensation on the windows!) but doesn't seem to do much heating of the house (ours anyway) except on really sunny days. I suspect (but have no proof) that the house feels warmer as there is less moisture in the air.

Cheers, Matt.




My views (except when I am looking out their windows) are not those of my employer.

 
 
 
 


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  Reply # 74444 12-Jun-2007 21:28
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I assume the systems are the same, I used to have details technical specs on the systems but have lost to the time.

They are basically fans which either suck air into the ceiling cavity, or blow it back down coupled with a microcontroller and a couple of temp-sensors (I simply used a PIC for mine which had two pipes, one into the ceiling for standard ventilation and one into the basement for cool summer air and a Peltier for "moisture removal")

Good for ventilation though I would be dubious about the cost as some seem prohibitivly expensive.. the in-pipe Bathroom shower  fans are pretty cheap really if you want a basic vent..

"Heat pumps" allow the system to run in reverse cycle so they can heat in winter, as do most air-conditioning units
It's really more of a sales gimmick than anything really to make it seems more "charming" as a heater for winter..

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  Reply # 74457 13-Jun-2007 00:06
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I have DVS with built in heater in my house (was here when I bought the place).

The DVS works great to removed the condensation on the windows.   I always wondered why the heater didn't seem to make any difference. Turns out it had a blown element. haha.. Anyway, DVS came and replaced the ENTIRE heater unit with a new one (newer model) free of charge and put a brand new warranty on the whole system.

That's pretty good customer service!

I'm keen to try out the heater sometime... alas the unit is switched off at present as I'm decorating and it likes to suck the plaster dust and clog up the filter. :)  That damn dust gets everywhere! ;)

I think DVS may have been the first?  It's amazing how suddenly all these 'dvs' type units are popping up.


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ZollyMonsta





Check out my LPFM Radio Station at www.thecheese.co.nz cool


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  Reply # 74458 13-Jun-2007 00:40
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I just checked their websites on "how they work" and asked a mate whom has seen many..

DVS  was the orig he said and possible better quality, the HRV is almost a "cheaper, simpler clone" but he's heard of no problems.

Yikes, they are pretty simple, only blowers, not even sucking like my home-made showerfan heap was.

good idea I must admit, and certainly spinning the old cash as most of these modern houses are horrid plastic airtight boxes.

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  Reply # 74564 13-Jun-2007 21:18
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I think they are all the same.

My parents got a HRV system installed. We did have one problem with the control pad having a error and wouldn't work but next thing you know the guys came back and fixed it. All done within a hour,

When it was turned on five minutes later i felt warmer. And now i feel safer spending money on IT as i know its alot dryer.

edit: All done in the hour meaning installing the thing and fixing the control pad problem. Also the guys who installed it were quite nice.



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  Reply # 75392 20-Jun-2007 20:07
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Out of the two the HRV is the far superior system.

DVS is a heat transfer, with a basic filter and a de-humidifier. If you want heating it costs extra. Dont get me wrong DVS is still good but HRV is better.

HRV does all of the above but has a few features more than the DVS for the same price. HRV will basically re-cycle the air in your house every 20-30 mins so gets rid of cooking smells, condensation, mould and mildew etc etc. I did alot of research when installing mine and the HRV won hands down and i would certainly reccomend it to anyone.

My parents have a DVS and dont get me wrong its great but not a patch on the HRV.

Also HRV has a "burnt toast mode" apparently that dispells the worst of all smells although im yet to try this out.

but yea definatly HRV over DVS anyday.

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  Reply # 75395 20-Jun-2007 20:14
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JamesHayward:

HRV does all of the above but has a few features more than the DVS for the same price. HRV will basically re-cycle the air in your house every 20-30 mins so gets rid of cooking smells, condensation, mould and mildew etc etc. I did alot of research when installing mine and the HRV won hands down and i would certainly reccomend it to anyone.


Does this mean it has higher running costs?

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  Reply # 75413 20-Jun-2007 21:06
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rscole86:
JamesHayward:

HRV does all of the above but has a few features more than the DVS for the same price. HRV will basically re-cycle the air in your house every 20-30 mins so gets rid of cooking smells, condensation, mould and mildew etc etc. I did alot of research when installing mine and the HRV won hands down and i would certainly reccomend it to anyone.


Does this mean it has higher running costs?


By a few cents.

I think its like 8 bucks a year to run including that feature.

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  Reply # 75428 20-Jun-2007 22:10
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The sales rep told me it costs about $1 a week to run the whole system and i can believe it. My first power bill since i had it installed had dropped by more than 50%

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Reply # 75432 20-Jun-2007 22:26
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Ok, speaking about these heat transfer things, I saw an ad for "HRV Telemarketers wanted, 29k - 65k, only 2 out of 8 positions left"

Hmmmmm.... Companies that cold call Telemarket can eat my boot as far as i'm concerned.

I might design one of these systems properly myself (already done in half an hour during today on my N95 phone - PIC, ULN Line driver IC to drive the mains control relays, 2x temp sensors, Hygrometer and an LCD driver and an oLED display) and get it made in China for 1/4 the cost and put these crowds out of business.

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  Reply # 76520 1-Jul-2007 22:51
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paradoxsm: I just checked their websites on "how they work" and asked a mate whom has seen many..

DVS  was the orig he said and possible better quality, the HRV is almost a "cheaper, simpler clone" but he's heard of no problems.

Yikes, they are pretty simple, only blowers, not even sucking like my home-made showerfan heap was.

good idea I must admit, and certainly spinning the old cash as most of these modern houses are horrid plastic airtight boxes.


The difference between DVS and HRV (heat recovery ventilation) is simple.  HRV put vents right through the home, so you can get the advantages of helping to heat your whole home rather than some of it.  HRV uses the best filtering system in the world.  They also run their systems on a Mercedes Benz fan, which has been running none stop for 25 years now without ever breaking down.

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  Reply # 76522 1-Jul-2007 22:55
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jessh1:

The difference between DVS and HRV (heat recovery ventilation) is simple.  HRV put vents right through the home, so you can get the advantages of helping to heat your whole home rather than some of it.  HRV uses the best filtering system in the world.  They also run their systems on a Mercedes Benz fan, which has been running none stop for 25 years now without ever breaking down.


What makes it the best in the world?

In regards to the fan, does it run for 25 years with regular servicing? Or do you just set and forget it?

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  Reply # 76523 1-Jul-2007 23:01
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The reason it is the best is becase it's a constitina filteration system, which you can't just buy.  Because of this filter, it actually purifies 99.4% of the air that you breathe so it helps with allergies, pollands, heyfevour, all those sorts of things.  And no the fan is montiored to make sure that everything is ok.

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  Reply # 76556 2-Jul-2007 10:29
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I measured the temperature of the air in our ceiling on a sunny winter day and it was only 10 deg. There's no way I'm blowing 10 deg air into our house. Why pay to heat that air when it's already a lot warmer inside? (Our house isn't that damp.)




 

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