NANOOK - open source DIY 19kW GWHP - Page 2

Murdock · 02-19-19, 11:42 AM

Nice build, professional look

Can you comment a bit on your start-up and shutdown procedure?

pavel · 02-19-19, 05:42 PM

There are three sequences controlled by the software:

START:
- turn both circulation pumps ON
- close EEV by 500 steps, open EEV by 150 steps
- ramp compressor SSR up from 50% to 100% in 800ms
- switch compressor coil relay ON
- switch compressor SSR OFF
https://github.com/burgrp/nanook-js/...r.js#L218-L243

STOP:
- switch compressor SSR ON
- switch compressor coil relay OFF
- switch compressor SSR OFF
- close EEV by 500 steps
- turn both circulation pumps OFF
https://github.com/burgrp/nanook-js/...r.js#L252-L280

MEASURE:
Is a simple sequence launched every 5minutes when HP turned off. It just turns output circulation pump ON for 30seconds, measures water temperature, and then turns the circulation pump OFF. This way there is no need for external temperature sensor.
https://github.com/burgrp/nanook-js/...r.js#L327-L338

Murdock · 02-26-19, 11:55 AM

looks like you have 3 speed-circulator pumps; Have you allready experimented with the speed of these pumps? I guess you could control the speed via 2 relays

pavel · 02-27-19, 04:49 PM

It could be controlled, but it seems to be not necessary. The secondary side is switched to minimum which is enough to transport the heat to accumulator tank. The primary side is switched to maximum, while the temperature drop is a bit higher then it should be - so I probably need more powerful pump here.

pavel · 03-24-19, 02:34 PM

Git repositories have been moved under DEVICE.FARM organization:
https://github.com/device-farm?utf8=...ype=&language=

02-19-19, 11:42 AM	#11
Murdock Lurking Renovator Join Date: Aug 2017 Location: Essen (Belgium) Posts: 4 Thanks: 1 Thanked 0 Times in 0 Posts	Nice build, professional look Can you comment a bit on your start-up and shutdown procedure?

02-19-19, 05:42 PM	#12
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	There are three sequences controlled by the software: START: - turn both circulation pumps ON - close EEV by 500 steps, open EEV by 150 steps - ramp compressor SSR up from 50% to 100% in 800ms - switch compressor coil relay ON - switch compressor SSR OFF https://github.com/burgrp/nanook-js/...r.js#L218-L243 STOP: - switch compressor SSR ON - switch compressor coil relay OFF - switch compressor SSR OFF - close EEV by 500 steps - turn both circulation pumps OFF https://github.com/burgrp/nanook-js/...r.js#L252-L280 MEASURE: Is a simple sequence launched every 5minutes when HP turned off. It just turns output circulation pump ON for 30seconds, measures water temperature, and then turns the circulation pump OFF. This way there is no need for external temperature sensor. https://github.com/burgrp/nanook-js/...r.js#L327-L338

02-26-19, 11:55 AM	#13
Murdock Lurking Renovator Join Date: Aug 2017 Location: Essen (Belgium) Posts: 4 Thanks: 1 Thanked 0 Times in 0 Posts	looks like you have 3 speed-circulator pumps; Have you allready experimented with the speed of these pumps? I guess you could control the speed via 2 relays

02-27-19, 04:49 PM	#14
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	It could be controlled, but it seems to be not necessary. The secondary side is switched to minimum which is enough to transport the heat to accumulator tank. The primary side is switched to maximum, while the temperature drop is a bit higher then it should be - so I probably need more powerful pump here.

03-24-19, 02:34 PM	#15
pavel Lurking Renovator Join Date: Jan 2019 Location: Czech Rep. Posts: 14 Thanks: 0 Thanked 4 Times in 3 Posts	Git repositories have been moved under DEVICE.FARM organization: https://github.com/device-farm?utf8=...ype=&language=