evacuated tube, definition of

An evacuated tube is most often encountered in solar hot water heating systems. This is where a glass tube is used, with a good heat conductor placed in the middle of it. All the air is removed from the tube, so that when the Sun light hits the heat conductor no heat is then lost out to the tube itself. This way the maximum amount of heat is caught and sent up the heat conductor to then heat the water passing over at the top of the tube.

The other advantage with this approach is that the tube will be placed to be always inline with the Sun as it move through the sky, i.e. no matter where the Sun is the central conductor will present the same surface area to heat.

Often these heating systems are so efficient, that over temperature valves and safety guards need to be put into the installed system.

• Carbon Offsets, what they are and how they help
  Carbon offsets can help with reducing overall carbon emissions by possibly balancing out the carbon impact on the environment. This article goes into more detail on the subject.
• Solar Water heating, how it works and the options available
  Solar hot water heating uses the sun to heat hot water. We explain what the hot water heating options are, their advantages and costs.

• Fixing a solar hot water controller
  Fixing a broken solar hot water controller need not be that expensive
• Cloud feedback wrong in climate models, paper
  A recent paper by Miller et al 2012 in the AMS Journal indicates that the climate models could be out by a factor of 19 with respect to actual cloud feedback.
• Droughts in the USA, not
  It appears that NASA's James Hansen has been caught out spreading unproven conclusions about droughts in the USA, when in actually it is not the case.
• Food - the other inconvenient truth
  Informative talk by Jonathan Foley on how our drive to produce yet more and more food is affecting our planet.
• Maths Bug on Android updated
  The Maths Bug app on Android has undergone major updates..
• If you want a democracy to fail...
  A video well worth watching that underlines what this is all about.
• The Denial Escalator
  Commentary on the supposed Denial Escalator and who really is in denial?
• Renewable power cannot reproduce base load availability
  We look at the question of whether renewable power is able to provide 100% coverage for base load and therefore remove the need for it.
• Extreme weather not related to Climate Change says IPCC
  In a rather surprising report from the IPCC they play down the link between extreme weather and Climate Change...
• Queensland cuts back on Green Schemes
  Queensland Premier Campbell Newman has ordered Anna Bligh’s husband to begin dismantling green energy programs he helped create, we examine what this will do.
• Labor loose big time in Queensland
  Labor have just lost Queensland in spectacular fashion, what does this mean for the Environment?
• Electricity Bills go through the roof!
  The cost of electricity in Australia is now amongst some of the highest in the world. We look at why and what you can do about it.
• New German anti AGW book and extensive media coverage
  Breaking News - new book published in Germany today called "The Cold Sun: Why the Climate Disaster Won't Happen". Also extensive anti-AGW newspaper coverage, amazing!
• Maths Bug Mental Maths app updated
  Maths Bug, our mental maths training Android application, has been updated!
• Wind power does not work - critical analysis
  Wind power, when put under critical fact based analysis is a really bad way to provide electrical power.
• Maths Bug app is out
  Frustrated by the lack of good maths teaching aid apps out there, we just went and wrote one cool maths game..
• ClimateGate FOIA Grepper available
  Search both ClimateGate I and II emails with ease.
• R Value Calculator App Updated!
  Some more functionality has been added to make it more useful.
• The Carbon War
  The Carbon War - how the ABC misrepresent the political and social situation in Australia around the Carbon Tax.
• Energy Consumption Calculator
  New Energy Consumption Calculator, work out appliance/devices energy usage and their cost, with phantom power costs.
• Al Gore Spamathon
  Al Gore wants access to your online accounts to spam all your friends!
• CSIRO government funded and government policy directed??
  We look at whether the CSIRO is a 'free' research organization or one whose research is driven by government policy.
• Sustainable House Day 2011
  Sustainable House Day is on again.
• Remote Sensing Editor Resigns over Spencer and Braswell paper
  Publishing a good paper that goes against the climate change 'consensus' is enough for a journal editor to resign over - OMG!
• Wind power in Australia...
  We look at what wind turbines need to operate then compare to available wind in Australia..
• Bob Kernohan interview wrt Julia Gillard
  2UE are about to release an interview with Bob Kernohan that could blow the top off the Australian Government...
• Power saving scams
  Power saving devices are often too good to be true and found to be scams that end up costing the Earth; be warned!
• Wind Power at least 6 times more expensive.
  When wind power is compared on a pure cost for watt basis it turns out to be at least 6 times more expensive than other established technologies.
• Last solar panel manufacturer in Australia, Silex Solar, stops making cells
  The last, of only ever two, solar panel cell manufacturers stops making cells in Australia..
• Medical Funding Research in Australia (NHMRC) budget needs protecting not cutting
  There could be plans to cut $400 million from the National Health and Medical Research Council (NHMRC) budget...
• Stop Coal Seam Gas...
  Seems now that we should stop coal seam gas, what are the pros and cons?
• Why Carbon Tax?
  Why do we want a Carbon Tax in Australia, this is a good question we will attempt to answer...
• Julia Gillard's Carbon Tax protest at Canberra
  Tomorrow in Canberra the Election Now No Carbon Tax Rally will do its thing...
• Carbon Tax Pros and Cons
  We look at the Pros and Cons of the Carbon Tax...
• The incredible shrinking carbon tax...
  Carbon tax is to be paid by even less industry, whilst in the US the Chicago Climate Exchange is finally put out of our misery..
• What is Carbon Pollution
  Carbon pollution, what is it?
• SpongeBob caught up selling Global Warming in schools
  Yep, its true, even good old little SpongeBob SquarePants is in on the act.. See the video below..
• Carbon Tax Convoy of No Confidence on its way to Canberra
  Want to be part of something Historic? Don't want to see Australia have a Carbon Tax? Read on...
• Keeping warm this Winter, the eco friendly way
  Tips on how to keep warm this Winter without breaking the bank or harming the environment.
• Home Ventilation
  Ventilating your home is important for your health and well being.
• What is weather and climate?
  What is the difference between weather and climate? We answer this question.
• What is climate change?
  We answer the question: what is climate change?
• Vaclav Klaus, President of the Czech Republic addresses the National Press Club
  The National Press Club Address in full by President of the Czech Republic, Vaclav Klaus: “The mass delusion of climate change”
• Window insulating trick
  Would just like to report a little trick we found out that dramatically improves window insulation qualities for little cost..
• Lord Monckton vs Richard Denniss at National Press Club
  A very interesting discussion between Lord Monckton and Richard Denniss showing the divide in logical reasoning between the well informed skeptics and the vague warmists. Worth watching.
• Carbon rap - even the young realise Climate Change is a fraud
  Good video explaining what is really going on with Climate Change
• Carbon Tax environmental train wreck
  The carbon tax in Australia is going to do zip to improve the environment.
• The Dead Carbon Tax Sketch
  Based on the classic Dead Parrot Sketch, enjoy!
• Mold Prevention
  Mold prevention, great new article
• Atmospheric carbon, man made Co2 measurement problems
  The 'man-made' carbon dioxide signature in the atmosphere is not as precise as it is being presented...
• Carbon Tax does not work
  Carbon Tax has been shown in the US to be totally ineffective; we compare against the situation with Carbon Tax in Australia.
• Free Green Dictionary App updated
  The Free Green Dictionary App has now been updated.
• Green Dictionary App available for Free
  We have taken the definitions off the Ecowho.com online dictionary and made them available for free in a standalone Android app.
• Property Assess App for buying or renting property released.
  We have just completed an application that will assist you with the process of considering properties for sale or to rent. It should take away much of the stress with keep track of notes, photos and key details.
• Cancun Cloud Feedback problems
  It appears that a 'weak' paper has been published supporting the IPCC cloud feedback models to coincide with the last day of Cancun.. hmm..
• Climate models are just wrong..
  In a recent paper climate models were hindcast tested against actual surface observations, and found to be seriously lacking if not totally useless... We provide some more background detail.
• 2010 the warmest ever; we think not
  The UN's WMO (World Meteorological Organisation) is saying 2010 will be warmest ever... The evidence does not back up the claim
• Will Kyoto fall on its own sword?
  It looks like Japan will stop Kyoto being extended and put a big cloud over Cancun.
• Climatic Models incomplete - poor understanding of mid level clouds cited
  Clouds play a major role in the climate-change equation, but they are the least-understood variable in the sky, observes a Texas A&M University geoscientist, who says mid-level clouds are especially understudied.
• Indonesia to cut down rainforests for $1Bn climate aid
  Indonesia plans to class large areas of its remaining natural forests as "degraded" in order to cut them down and receive nearly $1bn of climate aid for replanting them with palm trees and biofuel crops.
• Climate change is not the long term problem, environmental degradation is.
  We propose that man-made climate change, as a risk to society as we know it, is less of a real risk than current environmental degradation and pollution.
• CO2 global levels rising, is this a problem?
  According to recent reports in the media it looks like 2010 is 'expected' to be a record this year. We look into the actual facts and find this is just speculation prior to Cancum.
• Solar Panel Calculator
  Solar Panel Calculator, given the size, power and number of panels works out total power, rated voltage and amps.
• A Rational Discussion of Climate Change: the Science, the Evidence, the Response
  US House of Representatives Science Committee has a meeting today titled 'A Rational Discussion of Climate Change: the Science, the Evidence, the Response' - we give you the details.
• Green Blogging Sites
  if you run a green or eco blog, we would be interested in hearing from you
• Green gardening tips
  Just some simple tips I've found that make it easier to maintain a green garden.
• Plug pulled in French “Super Ministry of Environment”
  Its seems the French have given a big fat 'Nill Points' to the plans to set up a “Super Ministry of Environment” in France.
• ClimateGate Anniversary
  ClimateGate is just about to celebrate being one year old. We look at what has changed over the last year.
• Green Guffs of the week
  Quick summary of some major 'green' snarfs of the week in terms of not really doing the right thing to save the environment.
• Carbon trading is dead
  Carbon trading in the US is dead - the market set up to trade it is about to close down for lack of business.
• Biofuels destroying Rain Forests
  Biofuel producing crops are replacing rain forests, resulting in the silly situation that there is a net increase in carbon.

Related Tags: solar hot water