Tuesday 17 November 2009

FEED-IN TARIFFS

FEED-IN TARIFFS

QUESTION: Why are there more photo voltaic solar collectors (PV’s) in Munich than in Manchester?

Is it:
A) Because there is more sun in Munich than Manchester

Or
B) Because investing in photo voltaic panels in Munich will bring a guaranteed return on investment but in Manchester it will be a very expensive way to buy electricity


Answer…..B)


But from April 2010 the British government will be introducing feed-in tariffs for small scale photo voltaic, wind energy, hydropower, biomass and anaerobic digestion installations



What is a feed-in tariff?

A feed-in tariff is when a power company buys back surplus electricity generated in from renewable sources at a guaranteed price above market rates and the electricity is fed back into the grid. The buy back price is set above the grid cost and guaranteed for a number of years, usually 20 or 25 years. The ‘buy back’ price is set in relation to the cost of generation, so the buy back price for PV’s is higher than wind power because the installation cost of the former is higher. There is therefore a guaranteed return on the investment in the installation. The aim is to encourage investment in alternative, clean energy sources to cut down carbon emissions and reliance on fossil fuels.

But the cost of producing electricity from PV’s at present is far greater than from fossil fuel and greater than other forms of clean energy such as wind power. It is argued that the money could better be spent elsewhere

So how are feed-in tariffs financed?

The payment to the few with PV feed-in is financed by the power companies by a surcharge on the many who do not. But is this like the pensions problem….the larger the number of the ‘few’ who benefit from payments becomes….the smaller the number of the ‘many’ who pay!


The case against-
• a very expensive way to harness solar energy
• makes very little inroad into the government’s carbon emission targets

The case for-
:
• brings a lot more people into contact with green issues-it widens the debate.
• Stimulates investment in green businesses and creates jobs
• Develops expertise
• Has export potential
• Raises the UK profile in the green energy sector.
• Wider benefit to the economy. The panels themselves are likely to be mass produced in low cost base economies like China, but subsidies to encourage investment in green energy will encourage home grown industries and business and create jobs, benefitting the wider economy.
• There is the aim of reducing the cost of producing and installing PV panels so that there is ‘grid parity’- the point at which PV electricity is as cheap as that coming from conventional power stations


Germany has a huge number of PV installations-much larger than the UK. With volume comes lower cost and a growing reputation for Germany as a supplier and exporter of green technology.


There is a parallel with wind turbines-the UK has no manufacturers of wind turbines-they are imported from Denmark. Why? Is it A) because they have more wind or B) Because the Danish government has supported the installation of wind turbines with feed-in tariffs? Answer B)

The British government proposes to limit feed-in tariffs to small scale installations and retain the requirement for the incorporation of renewable energy contributions in larger schemes, so the proposals will have limited effect on overall carbon reduction. But as a measure to stimulate the home market in renewables and hopefully develop exports then subsidies in the form of feed-in tariffs is very cost effective…and good news for UK Plc.

Thursday 12 November 2009

Magnetic Levitation in the bathroom!


Noisy extract fans in bathrooms are a nuisance! Typically fans are controlled by the lighting circuit with an over-run after the light is switched off. The purpose of the extract fan is to remove smell and to lower humidity.
But over time the fan can become noisy. Extract fans offered by RHL of Reading England use magnetic levitation technology to eliminate contact between the fan shaft and the bearing and longer life and less noise are claimed see www.rhldirect.com

Removing humidity at source is the key to reducing condensation. Changing a bathroom extract from an over-run control to a humidistat controlled fan where a sensor detects the humidity level and runs the fan only until the humidity is reduced to acceptable levels will be more efficient in controlling moisture and save energy


Fixing Draughty Floors

We found a floor that had been sanded and varnished, but with the gaps between the boards left unfilled. In most UK houses with timber ground floors, the space under the floor is (or should be) ventilated to the cold outside air. It is surprising how the area of the narrow gaps between the boards adds up. In a typical room of say 25 square metres, each gap of 2mm between boards would be equivalent to an open letter box!

Unfilled joint on the left.Filled joint on the right

Ideally, gaps should be filled when the floor is sanded, using a binder mixed with the left-over sanding dust, but it can be done later after the floor has been varnished, although it is very time consuming. Go to a local joinery shop and ask for some sanding dust. You will need about a supermarket plastic bag full for a 25m2 room. You might get the dust for nothing or for a small charge. We used Bona Kemi Mix and Fill for the binder, because it is water based and easy to work with. Mix a small quantity (put the liquid in first and add the dust) and mix to the consistency of porridge. Work it into the joints with a paint scraper.



When put in during initial floor sanding the joints are usually over-filled and sanded back level. When doing it later, the gap filler will shrink back slightly, but this maintains the definition of the board joints and gives a pleasing effect. If there is a significant gap between the skirting and the floorboards, this can be covered with a timber quadrant bead or scotia moulding, either painted to match the skirting or stained to match the floor - tip: paint or stain it first before fixing.



The whole floor then needs a light sanding and re-varnishing. An easy DIY job for autumn and a very cost effective energy saving home improvement.

Tuesday 10 November 2009

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