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Author Topic: heat pump advice  (Read 2295 times)
noah
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« on: May 25, 2018, 01:06:53 PM »

I am thinking of installing a water/water heat pump in my workshop (maybe 5kw)
I have (in winter certainly) plenty of power from waterwheel/hydroturbine to run it and - being a hydro site - no shortage of input water.
Does anyone have any recommendation re makers/suppliers: i`m looking for a selfcontained unit which I can plumb in myself.
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pdf27
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« Reply #1 on: May 25, 2018, 01:17:43 PM »

I'd think seriously about an ASHP as an alternative - much easier and cheaper to install, and the main advantage of a ground/water source heat pump (slightly higher COP) is minimised if you're in an irregularly occupied workshop with your own hydro available. Navitron have got a suitable unit on at 720, and occasionally you can find a bargain on eBay. I also wouldn't discount resistance heat if you don't use it that much - better to spend the cash elsewhere in a lot of cases.
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ecogeorge
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« Reply #2 on: May 25, 2018, 10:52:05 PM »

Installed a Navitron 9kw  (9kw of heat uses approx 3kw running ) several yrs ago. Very pleased works a treat but fitted about 700m pipe underground.
With water so  readily available i'd go water -water  -- its finding a small water-water heatpump.
IIRC my 9kw wanted a water flow of 21 litres /min.
Just check if buying its not a swiming pool pump -these dont get high enough temps for heating .
George.
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billi
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« Reply #3 on: May 26, 2018, 05:51:15 AM »

 hi noah ,  what do you want to heat ?  and how ? radiators ?

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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
gnarly
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« Reply #4 on: May 26, 2018, 07:32:27 AM »

700m of pipe, ecogeorge?  How was that installed?  Seems like your brine temp should stay nice and high!

The smallest heat pump is the Kensa shoebox, at 3kW.

One thing bothers me about heat pumps is all the polythene pipe that goes in the ground... not exactly good for reducing plastic in the environment!  I wonder if this is a problem or not as it is buried so should stay buried, but it will break down into small pieces over 100s of years...
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billi
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« Reply #5 on: May 26, 2018, 07:55:24 AM »

or the  Ochsner Europa mini  EWP  with 3 kW, comes with a 75  meter copper coil gas filled  heatexchanger

http://ochsnerireland.com/ochsner-product-description.php?parent_id=25

Its discribed here to heat DHW  , but i know people that use it  for heating in passive houses

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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
noah
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« Reply #6 on: May 28, 2018, 11:24:12 PM »

Seen this on ebay

https://www.ebay.co.uk/itm/NEW-HOME-GROUND-SOURCE-WATER-TO-WATER-HEAT-PUMP-HEATER-22KW-RRP-3999/352352915043?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D9953ea5661c74bb58f92ecd3eab6c856%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D352352915043%26itm%3D352352915043&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A0cc0aacc-62c6-11e8-a8fc-74dbd1807c4f%7Cparentrq%3Aa8db5f4b1630ac3c491539bdfffad9f3%7Ciid%3A1

- worth a punt ? (can get for a bit under 2k I think) has Toshiba pump but otherwise not much info...
company has good ebay feedback and been around for a few years at least...
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Countrypaul
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« Reply #7 on: May 29, 2018, 07:09:42 AM »


That appears to be a 3 phase unit, do you have a 3 phase supply?
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nowty
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« Reply #8 on: May 29, 2018, 09:09:48 AM »

Looks like they do single phase versions too.


https://www.ebay.co.uk/itm/NEW-HOME-GROUND-SOURCE-WATER-TO-WATER-HEAT-PUMP-HEATER-12-5KW-RRP-2499/352344618331?_trkparms=aid%3D888007%26algo%3DDISC.MBE%26ao%3D1%26asc%3D52344%26meid%3Decfe9bf64ba5411f82fa82b8603015ea%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D352352915043%26itm%3D352344618331&_trksid=p2047675.c100009.m1982
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11kW+ of PV installed and 54+ MWh generated.
Lithium battery storage of 50+ kWh.
Hot water storage of 15+ kWh.
Heat storage of 15+ kWh.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
250,000+ litres of water harvested from underground river.
Home grown Fruit and Veg.
noah
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« Reply #9 on: May 29, 2018, 09:58:09 AM »

I have 3 phase supply : this is a big place 22kw would just be a bit of background heat. At the moment my 11kw hydro turbine has a diverter so in winter all 11kw goes into resistance heating when nothing else is on. This is in 7500 sq ft (grd floor - about 18,000 ft with upper floors). There is an existing (wood fired) system which is hardly used as I dont generate enough waste wood anymore and also a water/water heat exchanger which used to take wast heat offa 100kva  diesel generator befor I got mains 3 phase. So plumbing in to h/e should be simple enough.
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eabadger
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« Reply #10 on: May 29, 2018, 06:46:16 PM »

i have the air source version of the one above, needed to make some guess at settings and how to unlock controller, but working well and using excess solar to heat all our water, we use about 250l a day and can get to 54* after an hour an a half with 5x 1.2kw towel radiators also on.
happy with company and unit.

steve
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
noah
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« Reply #11 on: May 29, 2018, 11:45:15 PM »

steve
good to know thanks
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