Home  |  Contents 
Solar
  Forum Index : Solar         Section
Subject Topic: Solar hot water and frost. Post ReplyPost New Topic
<< Prev Page of 4
Author
Message << Prev Topic | Next Topic >>
DaveP68
Regular Member
Regular Member
Avatar

Joined: 25 November 2014
Location: New Zealand
Online Status: Offline
Posts: 62
Posted: 18 August 2016 at 2:04am | IP Logged Quote DaveP68

Hey Fred

just got to see your reply to a post on windmills and came across this. You seem to really know your stuff on this, PV solar and F&P Wind turbines. Keep up the good work, as I may have to pick your brains one day when I escape the city heading to a country lifestyle block and kiss good by to the grid connection...

Cheers

David


Back to Top View DaveP68's Profile Search for other posts by DaveP68 Visit DaveP68's Homepage
 
flc1
Senior Member
Senior Member


Joined: 20 November 2011
Location: New Zealand
Online Status: Offline
Posts: 109
Posted: 18 August 2016 at 2:59am | IP Logged Quote flc1

Gday Dave,thanks for the compliment,,you know more about f n p stators than I do

Edited by flc1 on 27 November 2016 at 6:10am
Back to Top View flc1's Profile Search for other posts by flc1
 
flc1
Senior Member
Senior Member


Joined: 20 November 2011
Location: New Zealand
Online Status: Offline
Posts: 109
Posted: 27 November 2016 at 6:28am | IP Logged Quote flc1



new solar water heater, glass tubes are filled with water, which heats water in tank and there is a copper coil inside tank which has the water for shower,bath etc flowing through it, cold water in one end and hot coming out the other , heat transferr to coil from hot water in tank. this one is alot more efficent than the other one that had the copper rods in the glass tubes.
Back to Top View flc1's Profile Search for other posts by flc1
 
Warpspeed
Guru
Guru


Joined: 09 August 2007
Location: Australia
Online Status: Offline
Posts: 697
Posted: 11 December 2016 at 5:32am | IP Logged Quote Warpspeed

Madness wrote:
In that case it would be worth looking at the frost valves that just work on temperature and drain water out of the panels.

I am pretty familiar with those frost protection valves, but it was a long time ago.

Draining off water sounds very dramatic, like Niagara Falls, or Little Johnny.

But those valves just dribble and drip a bit, and not much water actually comes out.
What happens is a needle valve opens at only a couple of degrees above freezing, and the needle valve holds that slight positive temperature at the drain valve body.

So if its only -5C or something for a few hours just before dawn, you might lose only a very few liters of water all night.
The water volume and total heat loss is absolutely insignificant.
It would make an excellent backup system for any other frost protection system you have.

This is all so very important.
I would not be confident that a single frost protection system is adequate, unless you test it frequently, which would be very difficult and inconvenient to do.

Most people just fit some frost protective device that is never tested again after initial installation.
It might go on working for thirty days, or thirty years, who knows ?
You will never know it has failed to operate until one day its too late.



__________________
Cheers, Tony.
Back to Top View Warpspeed's Profile Search for other posts by Warpspeed
 
flc1
Senior Member
Senior Member


Joined: 20 November 2011
Location: New Zealand
Online Status: Offline
Posts: 109
Posted: 08 January 2017 at 2:06am | IP Logged Quote flc1

blowing off some steam

Back to Top View flc1's Profile Search for other posts by flc1
 
Madness
Guru
Guru
Avatar

Joined: 08 October 2011
Location: Australia
Online Status: Offline
Posts: 685
Posted: 08 January 2017 at 2:13am | IP Logged Quote Madness

There is a bit more than just steam there, looks like a wet blow off. My Rheem glass topped panels give up at about 80 degrees and the water never gets above there.

Edited by Madness on 08 January 2017 at 2:14am


__________________
Off the grid and on the cloud
Back to Top View Madness's Profile Search for other posts by Madness
 
flc1
Senior Member
Senior Member


Joined: 20 November 2011
Location: New Zealand
Online Status: Offline
Posts: 109
Posted: 08 January 2017 at 3:18am | IP Logged Quote flc1

Madness
When we get a few fine days in a row this time of year we are getting a lot of hot water, can hear the solar water heater on the roof start rumbiling away and thats what you see in photo,
we are doing some clothes washing with warm water n having baths etc just to use it, ha, good way to be I sappose.It will be a diffrent story in winter though.

The new 300litre heater with the copper coil in the tank works well,so much better than the copper rod peice of junk that it replaced as decribed further back in this post,
Within days of replacing the copper rod heater, we had the surplus hot water.
Fred

Edited by flc1 on 08 January 2017 at 3:30am
Back to Top View flc1's Profile Search for other posts by flc1
 
DaveP68
Regular Member
Regular Member
Avatar

Joined: 25 November 2014
Location: New Zealand
Online Status: Offline
Posts: 62
Posted: 08 January 2017 at 4:02am | IP Logged Quote DaveP68

Hi Fred

Awesome result, well for summer time like you point out. You have surplus energy, bit like Rustyrod with him living in a windy location.

Need to get a solar system of my own up and running, will use PV array first off then supplement it with water heating like you have.

Cheers

David
Back to Top View DaveP68's Profile Search for other posts by DaveP68 Visit DaveP68's Homepage
 
flc1
Senior Member
Senior Member


Joined: 20 November 2011
Location: New Zealand
Online Status: Offline
Posts: 109
Posted: 09 January 2017 at 12:19am | IP Logged Quote flc1

yep that would be a good start,with your pv array, try to use panels that are all the same , makes life easier, not like my setup.
Back to Top View flc1's Profile Search for other posts by flc1
 


If you wish to post a reply to this topic you must first login
If you are not already registered you must first register

  Search the forums using Google.
<< Prev Page of 4
In the news...
 
Post ReplyPost New Topic
Printable version Printable version
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Powered by Web Wiz Forums version 7.8
Copyright ©2001-2004 Web Wiz Guide

This page was generated in 0.0781 seconds.
Privacy Policy     Process times : 0, 0, 0, 0.08