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Old 01-16-19, 01:21 PM   #1
pavel
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Default NANOOK - open source DIY 19kW GWHP

Hi community, I just want to share my successful built of 19kW ground-water heat pump. Its completely open source, incl. calculations, chassis drawing, schematics and control software.
Anybody who wants to clone the construction is highly welcomed!

Here are some highlights:
- 19kW heating power
- 65C / 149F max. output temperature
- r134a refrigerant
- 950 meters ground loop
- easy to build
- 8 temperature sensors
- 4 pressure sensors
- 2 flow sensors
- EEV (with supercapacitor backed up closure on power failure)
- Panasonic/Sanyo scroll compressor
- soft starter
- 2 circulation pumps
- onboard control system running Linux
- configuration via web browser

Image gallery:
ownCloud

3D model:
https://cad.onshape.com/.../e/8527985f7e35e0cf1587fe34

KiCAD schematics and PCB on my Github:
https://github.com/burgrp?utf8=%E2%9...ype=&language=

Looking forward to see your comments!

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Old 01-16-19, 01:31 PM   #2
pavel
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Default few images...

few images, just for case the link above does not work
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Old 01-16-19, 06:13 PM   #3
Fordguy64
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Default

That’s beautiful! What kind of C.O.P are you getting?
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Old 01-16-19, 06:35 PM   #4
pavel
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Default

Thanks. COP is not measured yet. The built-in pulse flow meter is working, but is not calibrated yet. As soon as I do calibration by another flow meter, I will let the software calculate COP and will post it here.
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Old 01-18-19, 02:40 PM   #5
randen
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Default

Pavel

I'm impressed. That is a beautiful job.!!! You have went the extra mile with controls. Soft start will be well worth the effort for a machine that size. We can compare notes with my 5 ton DIY

Randen
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Old 01-19-19, 06:02 PM   #6
pavel
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Default

Quote:
Originally Posted by randen View Post
Pavel

I'm impressed. That is a beautiful job.!!! You have went the extra mile with controls. Soft start will be well worth the effort for a machine that size. We can compare notes with my 5 ton DIY

Randen
Hi Randen, I like your drum design I wish my NANOOK will be as reliable as your machine - 5 years in service, that's impressive!
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Old 02-15-19, 03:06 PM   #7
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Default Budget

Any idea of the total price of equipment and time to spend?
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Old 02-16-19, 06:20 PM   #8
pavel
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In terms of time, it was almost one year of development. Construction of the pump itself, when I had everything on table, took few days only, it went smooth, including refrigerant charging. In terms of money, the pump was about 2500 USD, collector 3500 USD.
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Old 02-17-19, 06:12 AM   #9
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Default Costs

What are the typical costs for producing energy now?
Mantainance eletricity etc...
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Old 02-17-19, 11:42 AM   #10
pavel
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Here in Czech Republic, I would spend at least 3000 USD per year for direct electric heating. So it's quite a good ROI - if that's what you are asking for.

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