Navitron Renewable Energy and Sustainability Forum

HEAT PUMPS & Geothermal Energy => Heat Pumps => Topic started by: noah on May 25, 2018, 01:06:53 PM



Title: heat pump advice
Post by: noah 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.


Title: Re: heat pump advice
Post by: pdf27 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.


Title: Re: heat pump advice
Post by: ecogeorge 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.


Title: Re: heat pump advice
Post by: billi on May 26, 2018, 05:51:15 AM
 hi noah ,  what do you want to heat ?  and how ? radiators ?



Title: Re: heat pump advice
Post by: gnarly 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...


Title: Re: heat pump advice
Post by: billi 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



Title: Re: heat pump advice
Post by: noah 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...


Title: Re: heat pump advice
Post by: Countrypaul on May 29, 2018, 07:09:42 AM
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...

That appears to be a 3 phase unit, do you have a 3 phase supply?


Title: Re: heat pump advice
Post by: nowty 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


Title: Re: heat pump advice
Post by: noah 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.


Title: Re: heat pump advice
Post by: eabadger 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


Title: Re: heat pump advice
Post by: noah on May 29, 2018, 11:45:15 PM
steve
good to know thanks