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Archive for the ‘chp’ Category

The Green Building Council published a response in July to the Draft Statutory Instrument (which comes into force on October 1) for stamp duty exemption as proposed by our now Prime Minister in the last budget. I wish I had read it more carefully at the time…

Colleagues and I have been trying to disentangle the most cost-effective routes to achieving Code Level 6 of the Code for Sustainable Homes for a number of far-sighted and sincere clients who want to deliver the most efficient housing possible, and not just for those that can afford it.

Anyway, the budget announcement stated that zero-carbon homes would be exempt from stamp duty, which in reality is nothing more than a political gesture as the costs involved outweigh the stamp duty savings. Originally, the Code was written to allow for accredited offsite renewables which could demonstrate clear additionality, to be acceptable in achieving true zero carbon status. This was a bold step that, despite the uncertain mechanics of administration had the potential to allow developers the choice of investing in off-site renewables. Imagine being able to deliver say 30-50% CO2 reductions for the cost of a planning requirements of 10%? Or even a 100% reduction for an acceptable extra over to secure a particularly plum site. Too good to be true perhaps?

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In Building yesterday, a study by London South Bank University says a quarter of schemes in London are exceeding the 10% target. The article states:

In total the study, undertaken by London South Bank University, looked at 113 detailed energy statements for schemes that had been given planning approval.

Erm, but none of those scheme has been built yet. And currently there’s no mechanism for enforcing adherence to the commitment by developers – unless it’s written into a Section 106. This enforcement mechanism is a tricky issue that hasn’t been resolved as far as I know. The study also finds that:

…the most effective technologies at cutting carbon are CHP and CCHP, particularly where biomass fuel is used.

Fantastic, and I’m looking forward to seeing more biomass in London. We’ve specced it on a number of jobs, the first of which is up and running. But I can say that using biomass heating (never mind biomass CCHP) brings its own logistical tangles. It’s one thing to tot it up on a spreadsheet and another entirely to bring to fruition.

Without succumbing to the pessimism that seems de rigeur when blogging about the government’s or the GLA’s green policies, I’d just like to add a note of caution. The schemes have been granted planning permission but are by no means home and dry. A follow up survey is needed to see what’s actually built.

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What’s going on?

There’s been a fierce debate among energy bods this summer over the environmental effectiveness of combined heat and power (CHP) and CHP with cooling (CCHP) – a debate closely tied to assumptions about the carbon emissions associated with grid electricity in the UK.

What happened?

As noted in this blog in May, Arup associate director James Thonger opened up with a broadside aimed at the GLA policy of requiring CHP and CCHP on new developments. In particular he refuted LCCA claims that gas CHP saves 54% of carbon relative to grid electricity. The LCCA is headed up by Allan Jones, former green god of Woking and now darling of the London Mayor, who didn’t take the criticism lightly.

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Just heard from the folks at the Carbon Trust who are doing the micro-CHP field trials. The release date for the next interim report has been pushed back to the end of August with the methodology to follow some time after. Advise not holding breath.

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There was an article in the Guardian last Saturday (thanks to Tessa for spotting it) by Alex James, the bassist from Blur, about having an architect come to his home to give green advice. It’s a scheme run by the RIBA where architects provide green advice in exchange for a donation to charity. At first glance this sounds positive. Certainly it’s a great channel to spread information on energy efficiency.

But things get a little weird when the article states that thick rubble walls keep the house warm in winter – which they don’t. Then architect George Stowell suggests that Alex installs a biomass CHP unit to generate his own electricity on site from wood chips. But there aren’t any commercially available biomass CHP units on a single house scale (or even twenty times that big). He may have meant biomass heating, but it’s a hell of a mistake to make, recommending something that doesn’t exist.

It might be better to send a services engineer. CIBSE should consider something similar to the RIBA programme.

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Via Tom N, a great article in BSJ on whether CHP (and CHP + cooling) actually has as much potential to reduce carbon emissions as the industry (and Ken Livingstone) would have you believe.

In general, I agree with James Thonger’s conclusions. However… (more…)

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According to online energy auction house BuyEnergyOnline, during April 2007 UK gas wholesale prices rose by just 1% while electricity prices increased 13%, making the widest spark gap since deregulation. (more…)

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The people in charge of the micro-CHP field trial at the Carbon Trust say their next interim report will be delayed until early June with the calculation methodology to follow soon after. So we’ll have to wait a little longer for the verdict on micro-CHP. Interestingly, the MicroGen units are still in the trial so maybe it will become clearer why BG Microgen closed down.

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I saw on zerochampion that GTC Europe have got together with Cambridge Consultants to produce a single-house micro CHP unit. The key difference between this unit and the Mircogen or Whispergen is that it’s based on a Rankine cycle engine rather than a Stirling engine.

It’s got a similar electric-to-heat output ratio as the Whispergen and Microgen (1 kWe/9 kWt) but they claim that it operates at high efficiency at part load. They also say 2000 units will be available for sale by the end of this year at around €5000 each. It’ll be impressive if they hit the release target as the unit seems to have come out of nowhere. (more…)

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It was announced this month that BG Microgen are closing their doors. Microgen is one of two major players in the much hyped and still nascent domestic-scale CHP market. Why would a company backed by British Gas, with over £50m already invested, and poised to take a significant share of a huge market (so we’re told) close their doors just like that? (more…)

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