NANOOK - open source DIY 19kW GWHP

pavel · 01-16-19, 01:21 PM

Hi community, I just want to share my successful built of 19kW ground-water heat pump. It’s 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
- 65°C / 149°F 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!

pavel · 01-16-19, 01:31 PM

few images, just for case the link above does not work

Fordguy64 · 01-16-19, 06:13 PM

That’s beautiful! What kind of C.O.P are you getting?

pavel · 01-16-19, 06:35 PM

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.

randen · 01-18-19, 02:40 PM

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

pavel · 01-19-19, 06:02 PM

Quote:

Originally Posted by randen

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!

johnnypeste · 02-15-19, 03:06 PM

Any idea of the total price of equipment and time to spend?

pavel · 02-16-19, 06:20 PM

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.

johnnypeste · 02-17-19, 06:12 AM

What are the typical costs for producing energy now?
Mantainance eletricity etc...

pavel · 02-17-19, 11:42 AM

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.

01-16-19, 01:21 PM	#1
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	NANOOK - open source DIY 19kW GWHP Hi community, I just want to share my successful built of 19kW ground-water heat pump. It’s 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 - 65°C / 149°F 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!

01-16-19, 01:31 PM	#2
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	few images... few images, just for case the link above does not work Attached Thumbnails

02-15-19, 03:06 PM	#7
johnnypeste Lurking Renovator Join Date: Oct 2015 Location: portugal Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts	Budget Any idea of the total price of equipment and time to spend?

02-17-19, 06:12 AM	#9
johnnypeste Lurking Renovator Join Date: Oct 2015 Location: portugal Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts	Costs What are the typical costs for producing energy now? Mantainance eletricity etc...

01-16-19, 06:13 PM	#3
Fordguy64 Journeyman EcoRenovator Join Date: Oct 2011 Location: Cincinnati ohio Posts: 338 Thanks: 40 Thanked 35 Times in 31 Posts	That’s beautiful! What kind of C.O.P are you getting?

01-16-19, 06:35 PM	#4
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	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.

01-18-19, 02:40 PM	#5
randen Uber EcoRenovator Join Date: Apr 2011 Location: Strathroy Ontario Canada Posts: 657 Thanks: 9 Thanked 191 Times in 129 Posts	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

02-16-19, 06:20 PM	#8
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	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.

02-17-19, 11:42 AM	#10
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	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.