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Author Topic: Heat pump hot water  (Read 558 times)
jonesy
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« on: November 19, 2018, 08:10:31 PM »

A friend is thinking about installing a small, say 100 litre, heat pump cylinder like this one
http://www.ariston.com/ww/Air_sourced_water_heaters/NUOS_EVO_WH 
It's for 2 people, with no PV. Here in France there are no real incentives for any sort of sustainable projects. The standard install here is a 300L tank running on off peak electricity.
Anyone any experience of these heat pumps, or can recommend a different brand. Equally, what are the downsides - the marketing blurb shows very good economies.
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Warble
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« Reply #1 on: November 19, 2018, 09:21:15 PM »

There are the Panasonic Aquarea DHW systems which can extract heat from ambient air or from ventilation air taken from shower rooms, etc. I don't have any experience of them but they seem good on paper.
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gb484
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« Reply #2 on: November 20, 2018, 10:00:02 PM »

have no experience of these, but as you are in France: https://www.atlantic.fr/Chauffer-l-eau/Chauffe-eau/Chauffe-eau-thermodynamique or this: https://www.leboncoin.fr/bricolage/1508995546.htm/ or
https://www.leboncoin.fr/bricolage/1491533988.htm/
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gb484
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« Reply #3 on: November 20, 2018, 10:07:40 PM »

and then I found this: https://www.leboncoin.fr/bricolage/1503205086.htm/
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todthedog
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« Reply #4 on: November 21, 2018, 06:10:42 AM »

hello  Jonesy
Not sure it helps but I bought a heat pump in the uk and shipped to France.
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Fionn
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« Reply #5 on: November 21, 2018, 07:49:42 AM »

Has anyone experience with split heat pump water heaters with CO2 refrigerant?

This one (sandenwaterheater.com) has been tested to provide a COP of 2 at -8C and 2.75 at 0C
At 20C it rises to 4.2

Independent laboratory analysis here:
https://www.sandenwaterheater.com/sanden/assets/File/Sanden_CO2_split_HWPH_lab_report_Final.pdf
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linesrg
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« Reply #6 on: November 21, 2018, 08:40:37 AM »

Good Morning All,

I like the fact that this water heater uses CO2 GWP = 1 as opposed to the R410A in my CTC heat pump with a GWP = 2000, completely the opposite side of the scale.

It seems to get a good write up. One drawback is that the unit as tested doesn't appear to have any facility for immersion heaters as a back up?

Regards

Richard
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Fionn
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« Reply #7 on: November 21, 2018, 08:43:44 AM »

I think it does, they're mentioned in the test cycle for the repeated 8 minute shower test sequence.
The COP at high output temperature (and low ambient) is very impressive.
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Fionn
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« Reply #8 on: November 21, 2018, 09:01:51 AM »

Sorry, I was mistaken.
In the conclusions it says: There is no resistance element, or any backup heating system with this HPWH.  It is designed to always  heat with the compressor. "
However given that it can always achieve greater than 1.0 COP in conditions likely to occur in this part of the world I don't see it as a huge issue.
Given the compressor is variable speed I'd imagine it wouldn't take a whole lot to have it vary speed based on excess PV available.
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jonesy
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« Reply #9 on: November 29, 2018, 09:00:50 PM »

Thank you for the feedback everyone. The sanden unit seems a bit steep just now- it's about double a normal one, which is a shame as the figures are outstanding.  Time will fix that.
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