Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




404 posts

Ultimate Geek
+1 received by user: 83

Subscriber

Topic # 222846 31-Aug-2017 11:35
Send private message quote this post

I'm helping a mate with a project for his kids as per title as we realised we had most of the ingredients laying around to give it a go.

 

The basic design we have as below with main considerations being maximum solar energy absorption, insulation and ability to assist heating with wood burner / BBQ:

 

 

What improvements would you make?


Create new topic

mdf

1536 posts

Uber Geek
+1 received by user: 386

Trusted
Subscriber

  Reply # 1855869 31-Aug-2017 11:52
Send private message quote this post

Cool idea.

 

We have a hose tap for hot water on the outside of the house (the removable handle type) and use it all the time to fill our padding pool with warm water. One of the better home reno decisions we've made. That said, we've got continuous gas hot water and our paddling pool is *way* smaller than 5500L.




404 posts

Ultimate Geek
+1 received by user: 83

Subscriber

  Reply # 1855877 31-Aug-2017 12:00
Send private message quote this post

One thing I was wondering was if adding some sort of "thermal mass" in the form of heavy concrete pavers etc to the bottom of the pool would help to store heat or if it'd have the opposite effect.

 

Also whether floating some black plastic balls on the surface would help absorb & trap heat more so than making the bottom black.


 
 
 
 


mdf

1536 posts

Uber Geek
+1 received by user: 386

Trusted
Subscriber

  Reply # 1855878 31-Aug-2017 12:03
Send private message quote this post

Wouldn't the water already be a reasonably good thermal mass?


101 posts

Master Geek
+1 received by user: 40


  Reply # 1855885 31-Aug-2017 12:14
One person supports this post
Send private message quote this post

poolI have a pool that size in the picture, I use a black polyurethane sheet that does the trick.  After 1 hot sunny morning the water temp is over 22c.

 

The trick is not to sink the sheet to the bottom, have it slightly submerged.


2597 posts

Uber Geek
+1 received by user: 473


  Reply # 1855886 31-Aug-2017 12:18
Send private message quote this post

You will need a better pump, if you are planning to have to coil on the roof.

 

The pump provided with the pool will be $hit and will die if you use it to pump 5500l up any significant head....




404 posts

Ultimate Geek
+1 received by user: 83

Subscriber

  Reply # 1855890 31-Aug-2017 12:29
Send private message quote this post

wellygary:

 

You will need a better pump, if you are planning to have to coil on the roof.

 

The pump provided with the pool will be $hit and will die if you use it to pump 5500l up any significant head....

 

 

I imagine once the system is primed there shouldn't be any extra head? Air bubbles may cause issue though..




404 posts

Ultimate Geek
+1 received by user: 83

Subscriber

  Reply # 1855900 31-Aug-2017 12:41
Send private message quote this post

mdf:

 

Wouldn't the water already be a reasonably good thermal mass?

 

 

Relative to concrete? Another option I'm thinking is to stick the whole thing in a greenhouse...

 

Already have a ton of clear plastic sheet to re-purpose a cheap 3x3m Gazebo.


1835 posts

Uber Geek
+1 received by user: 575

Subscriber

  Reply # 1856092 31-Aug-2017 18:33
Send private message quote this post

I say definitely upgrade the pump. Those pumps struggle to push water higher than 1m or so. This was from a camping trip up north when me and some friends made a heated version of one of those pools. Using an old car radiator, modified 200L steel oil drum, and a washingmachine drum as the fire pit. It easily got the water in the radiator to boiling point as that pump couldn't push enough flow. And then the radiator failed as some of the tubes melted due to them steam locking. And heat output quickly went down due to the radiator filling up with soot. It sounds like a good idea, but in practice it takes alot to keep a pool nice and warm. Using a "bodge" system Biggest heat loss is from water exposed to the air - far bigger than from the sides, even if the sides were uninsulated steel.

 

You need 1KW/Hr of energy to heat 32L of water on a 25deg temp rise. So to heat 5500L to a nice spa temp, you will need 172KW/hr of energy. And in reality more to counteract thermal losses during heatup and while you are using it. Either way you are going to need some serious heating. See if you can find a secondhand wood chip heater, with a high output wetback fitted.






126 posts

Master Geek
+1 received by user: 14


  Reply # 1856999 1-Sep-2017 22:22
Send private message quote this post

I saw someone using an old freestanding wetback fire to heat their spa pool. Thougt that was a good idea. They paid $10 for it on trademe.

Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Chow brothers plan to invest NZ$100 million in technology
Posted 24-Sep-2017 16:24


Symantec protects data everywhere with Information Centric Security
Posted 21-Sep-2017 15:33


FUJIFILM introduces X-E3 mirrorless camera with wireless connectivity
Posted 18-Sep-2017 13:53


Vodafone announces new plans with bigger data bundles
Posted 15-Sep-2017 10:51


Skinny launches phone with support for te reo Maori
Posted 14-Sep-2017 08:39


If Vodafone dropping mail worries you, you’re doing online wrong
Posted 11-Sep-2017 13:54


Vodafone New Zealand deploy live 400 gigabit system
Posted 11-Sep-2017 11:07


OPPO camera phones now available at PB Tech
Posted 11-Sep-2017 09:56


Norton Wi-Fi Privacy — Easy, flawed VPN
Posted 11-Sep-2017 09:48


Lenovo reveals new ThinkPad A Series
Posted 8-Sep-2017 14:37


Huawei passes Apple for the first time to capture the second spot globally
Posted 8-Sep-2017 10:45


Vodafone initiative enhances te reo Maori pronunciation on Google Maps
Posted 8-Sep-2017 10:40


Voyager Internet expand local internet phone services company with Conversant acquisition
Posted 6-Sep-2017 18:27


NOW Expands in to Tauranga
Posted 5-Sep-2017 18:16


Windows 10 Fall Creators Update coming Oct. 17
Posted 4-Sep-2017 14:10



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.