plastic hot water tank with heat pump backup

ferox · 10-12-13, 05:40 AM

Hi to all

My solar hot warer tank is maded from a 1000L PP plastic tank used for chemichal produts, inside I have 4 pieces of beer keg 50L each, 10cm insulation, the top of the tank is used for storing.
The heat pump is a 24000btu R22 external unit with a direct heat in the tank with a copper coil 40m long, diam. 9.52mm.

I made a test to heat the tank to 60 deg Celsius and it works fine, I must test this at low temperatures 0 deg C. From 40C to 46 in 1h

I will made the controller for the heat pump with arduino, the solar controller is maded with arduino with data loged on xively

I will put picture and links later, I'm to new hear.

ferox · 10-12-13, 06:34 AM

The heat pump is modified a litle, I made to run in the summer whet the oustide temperature is more then 5 C and with water in the winter when is 5 C bellow (the winter side is not ready yet).
I do not know if it was worth it, but it was the simpliest way to start fror somewere, without masive change for pipings.
If you have some tips for this setup please leave a comment.

ferox · 10-12-13, 06:35 AM

I made a litle schetch to understand beter what I thought.

ferox · 10-12-13, 06:54 AM

The schetch

Click image for larger version

Name: schema pompa de caldura3.JPG
Views: 1109
Size: 19.4 KB
ID: 3481

Outside unit panasonic R22 24000 btu

Click image for larger version

Name: DSCN7259-2.JPG
Views: 1682
Size: 37.1 KB
ID: 3480

tank

Click image for larger version

Name: 05.jpg
Views: 1015
Size: 505.7 KB
ID: 3482

Click image for larger version

Name: 08.jpg
Views: 2074
Size: 120.7 KB
ID: 3483

Click image for larger version

Name: 13.jpg
Views: 1299
Size: 149.1 KB
ID: 3485

Click image for larger version

Name: 11.jpg
Views: 1134
Size: 120.9 KB
ID: 3484

Inside and outside the tank

Click image for larger version

Name: 20.jpg
Views: 1345
Size: 479.2 KB
ID: 3486

Click image for larger version

Name: 22.jpg
Views: 1288
Size: 492.4 KB
ID: 3487

Solar and heat pump heat exchanger

Click image for larger version

Name: 33.jpg
Views: 1068
Size: 574.3 KB
ID: 3489

Click image for larger version

Name: 44.jpg
Views: 1888
Size: 563.8 KB
ID: 3488

NiHaoMike · 10-12-13, 08:19 AM

Why is there a reversing valve? Ground source doesn't need to defrost.

ferox · 10-12-13, 09:03 AM

I got the air conditioner with this valve and made minimal change posible.
The ground surce part is not done yet and maybe I'll use in this winter.
I invest just in the coper coil, external unit I received for free from a friend.

Scifficus · 10-12-13, 09:22 AM

How thick is the insulation?

ferox · 10-12-13, 09:32 AM

insulated with extruded polistyren in most of the parts, 10cm.
temperature loss is ~2 Celsius in 6 hours.
logged data from xivley for beter improving https://xively.com/feeds/541753585
the pump and the heatpump is not logged, rapid heating of the tank is with heat pump turned on.

Ron342 · 02-09-17, 09:08 AM

May want to check your link, shows up bad for me?

Fordguy64 · 02-09-17, 10:20 AM

This thread is almost 4 years old.. Links are probably bad.

10-12-13, 05:40 AM	#1
ferox Lurking Renovator Join Date: Mar 2013 Location: Oradea Posts: 21 Thanks: 6 Thanked 5 Times in 3 Posts	plastic hot water tank with heat pump backup Hi to all My solar hot warer tank is maded from a 1000L PP plastic tank used for chemichal produts, inside I have 4 pieces of beer keg 50L each, 10cm insulation, the top of the tank is used for storing. The heat pump is a 24000btu R22 external unit with a direct heat in the tank with a copper coil 40m long, diam. 9.52mm. I made a test to heat the tank to 60 deg Celsius and it works fine, I must test this at low temperatures 0 deg C. From 40C to 46 in 1h I will made the controller for the heat pump with arduino, the solar controller is maded with arduino with data loged on xively I will put picture and links later, I'm to new hear.

10-12-13, 06:54 AM	#4
ferox Lurking Renovator Join Date: Mar 2013 Location: Oradea Posts: 21 Thanks: 6 Thanked 5 Times in 3 Posts	The schetch Outside unit panasonic R22 24000 btu tank Inside and outside the tank Solar and heat pump heat exchanger

10-12-13, 08:19 AM	#5
NiHaoMike Supreme EcoRenovator Join Date: Oct 2008 Location: Austin, TX Posts: 1,154 Thanks: 14 Thanked 257 Times in 241 Posts	Why is there a reversing valve? Ground source doesn't need to defrost. __________________ To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...

02-09-17, 09:08 AM	#9
Ron342 Apprentice EcoRenovator Join Date: Feb 2010 Location: Maryland Posts: 120 Thanks: 26 Thanked 12 Times in 8 Posts	link? May want to check your link, shows up bad for me?

10-12-13, 06:34 AM	#2
ferox Lurking Renovator Join Date: Mar 2013 Location: Oradea Posts: 21 Thanks: 6 Thanked 5 Times in 3 Posts	The heat pump is modified a litle, I made to run in the summer whet the oustide temperature is more then 5 C and with water in the winter when is 5 C bellow (the winter side is not ready yet). I do not know if it was worth it, but it was the simpliest way to start fror somewere, without masive change for pipings. If you have some tips for this setup please leave a comment.

10-12-13, 06:35 AM	#3
ferox Lurking Renovator Join Date: Mar 2013 Location: Oradea Posts: 21 Thanks: 6 Thanked 5 Times in 3 Posts	I made a litle schetch to understand beter what I thought.

10-12-13, 09:03 AM	#6
ferox Lurking Renovator Join Date: Mar 2013 Location: Oradea Posts: 21 Thanks: 6 Thanked 5 Times in 3 Posts	I got the air conditioner with this valve and made minimal change posible. The ground surce part is not done yet and maybe I'll use in this winter. I invest just in the coper coil, external unit I received for free from a friend.

10-12-13, 09:22 AM	#7
Scifficus DIY addicted! Join Date: Jan 2013 Location: Denmark Posts: 11 Thanks: 5 Thanked 1 Time in 1 Post	How thick is the insulation?

10-12-13, 09:32 AM	#8
ferox Lurking Renovator Join Date: Mar 2013 Location: Oradea Posts: 21 Thanks: 6 Thanked 5 Times in 3 Posts	insulated with extruded polistyren in most of the parts, 10cm. temperature loss is ~2 Celsius in 6 hours. logged data from xivley for beter improving https://xively.com/feeds/541753585 the pump and the heatpump is not logged, rapid heating of the tank is with heat pump turned on.

02-09-17, 10:20 AM	#10
Fordguy64 Journeyman EcoRenovator Join Date: Oct 2011 Location: Cincinnati ohio Posts: 338 Thanks: 40 Thanked 35 Times in 31 Posts	This thread is almost 4 years old.. Links are probably bad.