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Old 03-02-14, 03:31 AM   #1
geoheatnz
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Default New Zealand DIY Water Source HP.

Hi Everyone,
i finally have my project near completion and currently running in my shed for testing, bring on the winter!
I have a small stream that is 60 metres from my house and i use this as my heat source. My stream heat exchanger is stainless steel tube formed into a helix to improve internal turbulence and heat transfer.
Evaporator and condenser are coil in shell , titanuim and pvc . All heat exchangers are supplied by vaportec , a company in NZ.

It is a water to water heatpump that will be heating infloor radiant slab .
I will attach some photos of unit and stream exchanger in a few posts.

Cheers Andy

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Old 03-02-14, 03:34 AM   #2
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photo of heat exchanger
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Old 03-02-14, 03:35 AM   #3
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photo of heatpump





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Last edited by Daox; 03-03-14 at 10:17 AM..
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Old 03-02-14, 03:39 AM   #4
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Hopefully photos attached.
The stream heat exchanger is 3 x 6metre lenghts and gives me about 2.2m2 of area and when on full load , if stream is 17 c i will get water returning at 13c , cool it down 2k to 11c and round it goes. The stream stays at or above 10c in winter so a good source that was to good to go past.
If you would like any more info ,let me know.
Cheers Andy





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Last edited by Daox; 03-03-14 at 10:18 AM..
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Old 03-02-14, 09:29 AM   #5
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how many btu's of capacity are you shooting for?
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Old 03-02-14, 12:16 PM   #6
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According to the performance tables for the compressor at my running conditions , i have 9.5kw on evaporator side and 12.2 on condenser. So 32437btu evap and condenser 41655 btu.

Last edited by geoheatnz; 03-02-14 at 12:20 PM..
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Old 03-02-14, 12:52 PM   #7
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I know just where you are! Just a stone throw north from Massey University where I have lectured as a visiting professor.

Your climate is quite moderate and with this heating/cooling capacity, you can provide for a large home.

A beautiful area if I can say.

Steve
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Old 03-03-14, 02:22 AM   #8
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Hi Steve , yes we are 20 kilometers from Palmerston North in friendly Feilding.
Yes we do have a mild winter temps with no sustained freezing temperatures , sometimes just overnight. The calculated heatloss at 0c outside and 20c inside is 6kw . The HP is controlled by a VSD so i can adjust output to suit.
Cheers Andy
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Old 03-03-14, 10:22 AM   #9
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Welcome to the site Andy!

That looks like a very cool setup. How long have you been working on it? How is the testing going so far?
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Old 03-03-14, 12:35 PM   #10
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Hi DAox , i have been collecting the parts over the last couple of years as we started to plan the house build. The blue steel base and compressor come from an old dairy farm milk cooler, one pump comes from a supermarket sea food case and other from an old radiator heating system and so on.

The VSD had an earth fault and was thrown out , i fixed that and it works great . It gives me alot of information , kw/h , run hours, running amps , running kw, a start delay and a soft start plus of course the variable speed and load output. I have it connected to a high pressure transducer so it runs at 55hz for the start of heating and as it nears setpoint it will slow down to 40hz , this prevents the condenser approach temp from increasing to much and helps efficiency.

I must get to work ,
Thanks Andy

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