Solar Collectors using glass evacuated tubes, called Solar Tubes, are the most efficient Collectors available and are particularly suitable for the UK and other northern European countries. Their efficiency is such that they heat water all year round working even on cloudy days.
The HS-VAC1.8 is the solar absorber. It absorbs solar energy converting it into heat and is a “twin-glass tube”. This type of tube performs reliably and is a component part of tube type solar water heating panel. Fifteen HS-VAC1.8 tubes are mounted on a vertical incline into a heat exchanger to form a solar hot water Collector.
How it works
The process by which solar radiation is converted into heat is as follows.
The HS-VAC1.8 has an excellent selective absorption coating which produces an efficient method of heat generation. This heats the inside skin of the glass tube where the heat is transferred through conduction and radiation to the centreing metal heat fins and the central copper tube. This tube contains pure water with anti corrosion additives. The inside of the tube is at a reduced pressure so that the water boils at around 30°c. The hot water vapour rises to top of heat pipe where the heat is transferred to the circulating water, the vapour condenses and drains back down the tube.
As the HS-VAC1.8 has less parts to absorb heat before any meaningful heat transfer can take place, it starts producing heat more quickly than flat solar panels, even on cloudy days. It can even produce heat on sunny days at -30°c. It also is more resistant to frost damage and scaling. Each HS-VAC1.8 works independently of other tubes in the same racking system. This means that if a tube is damaged, the other tubes are unaffected and the system still produces solar energy.
The HS-VAC1.8 performs better than flat plate solar collectors in cold weather because it minimises heat transfer losses to the water.
Solar water heaters using the HS-VAC1.8 are aligned in parallel; the angle of mounting depends upon the latitude of the particular location. In general, the efficiency of a HS-VAC1.8 system depends upon a number of factors, one important one being the level of solar in the region.
Basic Specifications of the HS-VAC1.8
|Structure||All-Glass Double-tube co-axial structure|
|Glass Material||High borosilicate 3.3 glass|
|External pipe diameter/thickness||58mm, +/- 0.6mm; T=1.6mm|
|Internal pipe diameter/thickness||58mm, +/- 0.6mm; T=1.6mm|
|Sf*dime»nt method||3 Target magnetron sputtering plating|
|Idle sunning property parameters||Y=260-300m2 7KW|
|Solar Irradiation for preset water temperature||H<=4.7MJ/m2(O58)
|Solar irradiation for preset water temperature||H<=3.7MJ/m2(047)
|Average Heat Loss coefficient||ULT= 0.4-0.6 w/( m2 °C)|
Solar hot water heating systems use the free heat from the sun to provide your hot water requirements, be this for your home or your business. During the winter and at times in the springs, autumn and even summer, it is necessary to additionally heat the water with a conventional boiler or immersion heater. However, when solar energy is available the amount of fuel needed for this purpose is dramatically reduced or removed all together.
How do they work?
- Solar water heating systems use panels, called Collectors that are fitted to a roof or mounted free-standing on flat roofs or even in flower beds. South facing, pitched 45° angle positions are best but Collectors can be east or west facing. Two distinct types of solar water heating panels are commercially available.
- Flat Plate Collectors. These comprise an insulated frame with a glass cover in which sits an absorber plate and pipework. The Collectors can be fitted in the roof or on the roof, which is the easiest method for retrofit installations. More radiation is absorbed if the cover glass is made from iron-poor safety glass as this allows light in the short-wave spectrum to pass through. The shorter the wave length the more energy is in the light. Flat Plate Collectors are less efficient than Glass Evacuated Tube Collectors and do not work well in winter.
- Glass Evacuated Tube Collectors. These are also called Solar Tubes and use the principle of the vacuum flask to efficiently capture the suns rays to heat water all the year round. Far more efficient than Flat Plate Collectors, each tube concentrates heat in its pure copper tip. The tip of each tube is inserted into a manifold where the heat is transferred to the water. Solar Tubes will heat water to over 60°c in strong sunshine when the outside temperature is -30°c. They also work better than simple Flat Panel Collectors in east-west orientations. Larger Glass Evacuated Tube Collector systems can se used to heat or supplement the heating of a home or business but mainly in summer and sunny days in spring and autumn.
When installing Collectors other factors such as the condition of the roof, shading, aesthetics and accessibility need to be considered when choosing where to locate a Collector.
- An indirect circulation system is used to pump the heat transfer fluid (mixture of water and antifreeze) from the Collectors to the heat exchangers in the hot water cylinder or other heat dump zones. Some indirect protect themselves from over heating to stop the glycol fluid from becoming super-heated when demand is low and solar radiation is high.
- Antifreeze. The indirect circulation system is pressurised and uses an expansion vessel. The heat transfer fluid comprises a non-toxic food grade glycol-water mixture with the concentration of glycol dependant on the likely minimum temperature. As the system is pressurised, the boiling point of the heat transfer fluid is much higher than that of water.
- Drainback systems. These use pumps to push the water through the Collectors when there is solar radiation. When the pumps stop the water drains into a reservoir tank so there is no water in the Collect to freeze in cold weather. Fine in theory, but these systems are more difficult to install and get right so that the piping always slopes downward to completely drain from external area that can freeze.
- Storage of hot water is the next consideration. Here, a Solar Cylinder needs to be installed to store the water heated by the sun. For most central heating systems this will mean replacing the existing gravity fed hot water cylinder. Modern combi-boilers have no hot water cylinder but flash heat mains pressure water on demand. This is a more difficult installation but be achieved by using valves to separate the two systems.
- The important point here is to make space the largest Solar Cylinder that can be accommodated. The thermal efficiency of these means that water heated the day before yesterday can often be used today; or at worst act as pre-heated water that only needs to be topped up.
Why install solar hot water heating
- Cut fuel bills. Once the initial installation cost is paid the hot water costs will be slashed.
- Cut your carbon footprint. Solar hot water from sunlight is a green and will reduce carbon dioxide emissions.
- The cost of gas, electricity, oil and coal is likely to rise faster than interest on savings and wages.
Cost and payback
- The Energy Savings Trust says the typical cost of solar water heating system range from £3,000 to £5,000.
- Savings are good, although the Energy Savings Trust just say “moderate – a solar water heating system can provide about a third of your hot water needs”. This depends on some extent to where you live in the UK and how much hot water you use. A guide would be 50-80 litres per person per day. From our experience a solar heating system provides nearer to 70% of hot water needs, which is double the modest claims of the Energy Savings Trust – and of course there’s the CO2 emission savings too.
Things to consider
- The Energy Savings Trust suggest you will need a minimum of 5 m² of space for a solar hot water collector system, although two of our 2 m² glass evacuated tube Collector seem to be fine for most households.
- Solar heating needs a sunny position for the Collectors. South facing is best but east to west will work with two panels, one facing east and one facing west. The installation of this configuration will be more expensive, but the parts costs from SolarSave are around the same.
- Planning permission is not normally needed but it’s always best to consult your local planning authority if you live in a Listed Building, or a building in Conservation Area or World Heritage Site.
- Collectors don’t always have to be mounted on a roof, they can be fixed to a frame on flat roofs or even in the garden. If you have a heated swimming pool then they are seriously worth considering – providing you have the space.
Everyone is trying to live “greener” and become more environmentally friendly. Many people don’t realise is that it’s also much cheaper.
Choose Environmentally Friendly Products for an Environmentally Friendly Home
– Use recycled paper plates, paper towels and napkins. These are available beside the normal paper products. There are even coupons available which make them the same price as similar products.
– Say no to bottled water. Filtered tap water is perfectly safe. Plastic water bottles do not decompose well and are filling up the landfills too fast. PET bottles can be recycled, but why are we making so many of them in the first place. We drink 3 litres of water a day. that’s 6 plastic bottles. Now there should be a cut off point – these bottles are completely re-usable. We should already have no need for plastic bottles as we have a stock in our home. Sadly not, we throw them away and buy another tomorrow. This is disastrous for environment and significantly increasing our carbon footprint.
– Switch to environmentally friendly cleaning products. These products do not contain toxic chemicals that they are between up in the sewers, ocean and water supply. In addition, they produce very little if any fumes so they improve the air quality inside the home.
Energy for an Environmentally Friendly Home
– Install a programmable thermostat. This one is a no brainer and can possibly save the most money. Remember less energy waste equals more household savings. It also means less use of renewable energy we create, and therefore less reliance on fossil fuels.
– Insulate the home better – cavity wall insulation and loft insulation can make significant differences to your heating bill, and subsequently, the amount of energy used in the home.
– Weather strip and caulk all doors and windows. To determine if this needs to be done, hold a lighter near the cracks of windows and doors. If the flame flickers, there is a draft that needs to be sealed. You’ll see the flame drawn and pushed away from the window quite easily.
Washing Clothes in an Environmentally Friendly Home
– Skip the dryer. Instead get a clothes line, or simply hang the items up on hangers in the closet to dry. If the closet door remains open most clothes will dry fine by themselves. If there’s plenty of sunlight and wind, your clothes will be fresher for it as well.
– Always wait until there is a full load of laundry before running the washing machine. The same goes for the dishwasher too. Setting off half a load is extremely wasteful, not the detergent, I am sure you put less in, but the same electrical energy is used. We can’t afford to waste our solar power.
Outdoor Ideas for an Environmentally Friendly Home
– Don’t throw away hazardous waste. Not only does this apply to paint, paint thinner, automobile oil, and chemicals.
– Use a manual lawn mower. These require no gas, make no noise and allow users to get a little exercise while using them. This is a win-win for both the home owner and the environment.
Save Water to Have an Environmentally Friendly Home
– Install a low-flow toilet. Low flow toilets save tons of money and water. If a new toilet isn’t in the budget, place a clean brick in the tank of the toilet will achieve the same benefit.
– Stop leaks. Check all of the faucets, inside and out, and make sure that there are no drips or leaks. Water is precious, don’t waste it.
– Trying to have a more environmentally friendly home is not only good for the environment it’s good for the family too.
Don’t replace, sash window repair is the new eco hack
Whatever you do, don’t replace your sash windows, there’s a dozens more alternatives out there before replacing your original joinery and we will take a look at them together. It’s possible you have some rot, and your sill or sash need a splice, many companies will tell you they need entirely replacing, in fact some unscrupulous companies hide behind the ethos of repair, to validate the fact they condemn all windows and offer a hard sell. Just take an example poor customer who was duped into having all her sash windows removed for an inferior UPVC, when all she really needed was a good bit of sash window repair.
There are dozens of articles out there about sash window repair and how to fix sash windows with broken cords, and then there are even more comprehensive sash window repair resources available here which detail exactly how to go about repairing sash windows rather than costly replacement. Sash windows can also be draught proof and there are several government incentives to go green with your sash windows. Basically depending on your London postcode theres a fair chance your windows can be repaired, draught proofed, and if lucky you might even be entitled to double glazing. This is incredibly good incentives from governments, who are being forced to aware of the perils of climate change and carbon footprints which in recent studies have proven to be of significant cause for concern.
We highly recommend you carry out sash window repair before replacing, the damage to the environment is not limited to the glass that needs to be manufactured, trees also need cutting down to make new windows and then the energy required to process the tree into a window is no small matter. Sash window repair on the other hand is sympathetic and cost effective making it the perfect eco hack.
One of the most common ways to light your home at night in Asia is solar lighting. Amazingly China are leading the way in the battle against use of outdated lighting methods. They are mass producing solar lighting which are lasting for over ten years as well as costing the home absolutely nothing to run, now don’t call me a conspiracy theorist but why on Earth is a part of the planet this is so over populated coming up with brilliant ways to not necessarily save money but actually produce power that a centralised government simply is not capable of doing.
Now take a look at a developed country such as The UK or anywhere is Europe for that matter solar lighting is extremely expensive and very scarce. I’ll give you an example. This nice little light that produces ample visibility for your garden path is 1$ for one in China, now in the UK this very same item is £15 in most retail shops.
Look I’m getting out of control here with my rants this was supposed to be about solar lighting and I am going off on a tangent. Here’s the bottom line. Solar lighting in China costs peanuts, please if you have a night light use it. They work in a simple but brilliant way. They have a small storage capacity which will allow the solar panel to absorb energy enough that the light can stay on all night whilst the next morning the power will be close to low and the charging process will begin all over again. By making sure the power charges up and down slowly everyday the battery will continue to hold power for ten years no problem at all. For the small cost of plastic the saving to the environment is massive. Just imagine if we all swapped over to this form of lighting. The savings in electric produced would be phenomenal as we ll as the jobs that are created by manufacture! Seriously guys solar power is affordable and we’ve got to start taking advantage of it.
If you think we will buy a normal light there really is no damage to the environment at all as it’s simply a case of swapping over the method in which we light our homes. Solar lighting is one way we are going to keep our homes relevant and up to date. Now you might be wondering if this truly is the future because Elon Musk has released unbelievable roofing technology for solar power however, for the average home it just is not viable yet and he is being hit by governments not willing to reduce tax on increase property value, as well as the cost of the install itself.
Sash window repairs London are one of the best eco hacks for any period property homeowners. The cost to the environment of entirely replacing sash windows with ugly UPVC , which was once considered high tech and good quality is horrendous. We are simply running out of places to throw away all this plastic. At least when a wooden window is replaced like for like it is disposable and a renewable source. So always best to carry out sash window repairs, London rather than replace if at all manageable.
It’s been said sash window repairs in London can be considerably more costly than replacement. Typically the homeowner needs to research further because plenty of sash window companies in London will repair windows for a fraction of the cost of replacement, even a fraction of nasty plastic windows. Normally sash window repairs can be carried out for less than half the cost of replacement, and in some cases not even a quarter. It’s a brilliant saving in money, and even more of a saving in carbon emissions. We must all do our bit when we can.
The latest technologies are used when carrying out sash window repairs London, a super new invention called epoxy resin is used to fill areas that have rotted away. Firstly the Sash Window Repairs London company will cut away the rot and then use the resin primer to seal in the repair. Once the resin cures it’s a simple case of sanding and priming. Once complete we are as good as new then without the damage to our environment.
Sash windows can be repaired in many ways. Sill sections can be cut out and replaced. Normally this will be with a hard or softwood at the discretion and budget of the homeowner. Hardwood is recommended for a longer lasting finish. The labour costs more than the timber and makes sense to invest in your home first time, properly.
Broken panes of glass can be replaced and putty made good. Window pulleys that are stiff or squeaky can be repaired, replaced, or lubricated. Normally lubrication is sufficient to take the edge off a squeaky pulley wheel.
Sashes that are rotten need not automatically be binned. The Sash Window Repairs London Company can make good in most cases and even offer a five year guarantee on these repairs. Normally when these repairs are done a draught proofing system will be installed because it does not increase costs and is a fantastic upgrade that drastically improves the comfort of a period home whilst reducing energy use. The primary energy is gas which is a great positive for the environment . Any time we can save energy, save money, and improve the environment we should be taking full advantage of that opportunity
Solar panels and solar setups work in two distinct ways. One is on grid, the other off grid. Off grid is currently rather expensive because the cost to replace batteries is prohibitive. As technology has improved, so has the viability of an off grid system because batteries are holding more power, longer. It’s still not quite there in terms of a cost efficient mechanism to replace coal power stations. We are not that far away however.
If you have access to the grid, then you should have solar panels installed. It’s as simple as that. In most countries around the world solar panels are relatively cheap. A full 5000 Watt system should not cost anymore than £4000 and another £1000 to install. This will power most homes comfortably to the point minor top up may be required from the grid, however that’s unlikely. You are more likely to be feeding the grid.
One major requirement for solar panels is roof space. To get a 5000 Watt system on your roof would require 40m2 of free space. This is normally going to be ok for your average 3 bed home. The maintenance is absolutely minimal and mid quality cells from China are still going to last fifteen years providing an astonishing payback. By the way after fifteen years your solar panels are not useless they will have lost a fair amount of performance however, in the region of 30%. It is certainly not even close to throw away. Many homes run on 3000 Watt systems according to varying sources. There is every reason to think a solar system will last twenty five years.
The only thing stopping this revolution is the upfront cost. Government incentives will hopefully make this all the more attractive proposition in the near future and continued improvement in battery technology allowing for homes without grid to become normal. Government have already recognised many other technology savings, such as sash window draught seals, so why not cut solar tax? It’s an exciting time in human history. Think about it – Elon musk has just announced his new high tech roof will only cost a mere $22 a square foot. Now combine the over supply of electric with an electric car – and that is a warm thought to not be powering our vehicles and home on dirty fossil fuels. He’s also gone on record as stating that his wonderful system may only require 40% roof coverage in the high tech beautiful solar tiles, the rest being ordinary. That means the remaining 60% can be used to power our car, or heat our water with electric, and maybe do away with gas in the home as well. I believe the future to be solar and it’ll be in every home as standard pretty soon.
Cavity wall insulation is a great way to reduce the cost of your energy bills whilst improving the quality of your home comfort. Cavity wall insulation serves to reduce heat loss, and a handy bi product is the reduce noise transfer through walls, leaving you feeling extra snug and secure.
Cavity wall insulation is an epoxy foam that is pumped into the cavity of your walls. This stops draughts and air transfer as well as binding the walls together nicely. Many holes are drilled externally so that the foam does not need to be injected into one area alone. Multiple holes ease and assist the transfer through the cavity reducing friction, and increasing the likelihood of completely filling the cavity without leaving spaces.
Once the holes are drilled and the foam is filled entirely the compound is left to set and cure. Once cured any foam that escaped can now be trimmed off and the drilled out holes can be made good. It’s a little difficult on exposed brick homes as you can clearly see the drilling which is unfortunate but the benefits far outweigh the negative impact on aesthetics. If your home is rendered then the impact is minimal. The render is patch and then painted over leaving no visible marks from the installation of foam.
20% of heat is lost through walls and it is the second most important part of improving the conditions in your home. Loft Insulation being the only better value job pound for pound. I suggest you take a look at loft insulation first if you haven’t already.
This is the second largest heat loss area, second only to the loft. The cost of cavity wall insulation has risen dramatically in the last few years mainly because the amount the government will subsidise this important energy saving job has reduced significantly. Most homes that are large, will need to contribute more than the government now does if your unlucky. The costs contribution your end might range from £200 to £500. However much the cost, the job provides assured heating payback as well as making the home more comfortable. I highly recommend cavity insulation as long as your house brickwork does not suffer from damp or your in coastal areas.
The last remaining important factor to discuss is the quality of tradesman you use. There is a big difference between a poor and a good cavity wall installation. If your installer does not drill enough holes close together the chance of having pockets of air is quite high. You also must consider a good installation will have as smaller impact on the aesthetics of your home as is possible.
Eco hack draught proofing sash windows.
There are dozens of good reasons to draught proof your original period sash windows. There are almost no reasons not to do it, other than the initial upfront outlay which may be prohibitive. However looking at a short three years we cannot name the upfront outlay as a reason not to do it either, because payback is already in full.
Draught proofing sash windows, above all, stops annoying, draughts! the brush pile creates a complete perimeter seal to block air movement both in and out. This will significantly improve the heat retention. It’s said that each window draught proofed will save £50 per year on heating. It’s only beaten in value by loft insulation and cavity wall insulation. This is a typical figure and will vary on size, as well as how draughty the windows were before the service. A room with a bay window of sashes will still have single glazing and therefore the heat loss through glass will still be significant, although you’ll be surprised just how much more comfortable the room feels with draught proofing. In the case of a room with one or two small sash windows the impact is significant. The heat retention is almost instant.
Draught proofing also helps to cut down on noise. It will not stop piecing noise but it will keep the drone out as well as reduce that piercing noise to something far more bearable. Some homeowners consider double glazing of sash windows in the event sound is the main issue.
Sash window draught proofing provides an opportunity to serve your sash windows. If your windows are stuck, or painted in, or need an overhaul it’s a great time to get a draught proofing system as the installer will need to remove sashes as part of the draught proofing system.
Draught proofing your sash windows will stop annoying rattles of the sash to frame. If you’ve ever been on a bus route, all too common is the rattle from a throaty engine passing by. This is will be eliminated instantly from the point of professional draught proofing system installed.
Typically sash window draught proofing in a ten window home will reduce energy consumption by £500. That is a lot of gas! If we consider the payback may be around 3 to 4 years every single home should be looking for this upgrade. Sometimes draught proofing is combined with heavy curtains, in an attempt to create, similar conditions to secondary glazing. You can checkout these London Draught Proofing Sash Windows Specialists. Heavy curtains really work, and some are not all that expensive. It normally boils down to the preferences of the homeowners, some prefer modern blinds and shutters which do not offer the same protection from the elements.