An Eccentric Anomaly: Page 4: Houses

Ed Davies's Blog


Pages tagged: Houses

House construction, energy efficiency, etc

Heatloss Calculation

My house designer is, understandably, a bit concerned about how he'll put the rather unconventional heating arrangements for my house into the SAP software. The other day we were discussing the emitters (radiators) involved and talked briefly about the size that would be required if we were to ignore the heat leakage from the thermal store which should in practice supply a lot of the background heat needed.

To get a grip on this myself I decided to update my heat loss calculations to the slightly evolved design of the house and to allow for the regulatory requirement that the emitters should be sufficient to keep one apartment at 21 °C and the rest of the dwelling at 18 °C.

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Planning Permission

I seem to have planning permission.

Looked online earlier today and it wasn't there but looked just now and it's shown as having been granted yesterday.

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MHRV Heat Exchanger Area

In my recent MHRV Ventilation Requirements post I established that I need the heat exchanger in the ventilation to recover about 1200 watts of sensible and latent heat from the outgoing airflow to warm the cruel cold air coming in from the outside.

Next it's worth working out the area of interface needed between the outgoing and incoming airflows to achieve this. This might seem strange without having first decided on the design of and materials in the exchanger but actually, as I'll show, the actual materials used don't make a lot of difference.

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MHRV Ventilation Requirements

Having got the design of my heat exchanger significantly wrong I'll, for now, just post the requirements bit which I'm fairly happy with.

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MHRV Oppsie

Over the last few days I've been writing a fairly detailed blog post about the design of the mechanical heat-recovery ventilation (MHRV) for my house. I got it all finished yesterday afternoon, did some shopping, then settled down to proof read it before uploading in the evening.

As I read it I thought of a point I should, perhaps, describe a bit more carefully so started scribbling a little diagram to help explain it. At this point I realised that my whole design (of the MHRV heat exchanger, not just the description in the blog post) was badly wrong.

Oops - feel a bit like this kitten. Back to the beginning - a post on the basics…

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Updated House Sketch

The planning application is, at last, in. It's taken a while with toing-and-froing between me and the house designer being fairly slow. He's been working on this a couple of evenings a week and a few hours many Saturdays which is plenty of time to allocate to the actual work but this design has been a lot more interactive than many of his projects - if I leave something to think about overnight or whatever it can easily mean a few day's delay before the next cycle completes.

Christmas and New Year blew a big chunk of our time budget as well as we both went away at various times. We were one day short of four weeks between one of my messages to him and his response. Quite understandable in the circumstances but tedious, none the less.

My original plans have survived reasonably well but we've made a few tweaks.

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SketchUp Components and Groups

Just over a year ago I posted Components and Layers in Google SketchUp. This is something of an update to that.

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Dehumidifier Arithmetic

The Navitron forum is having a discussion on dehumidifiers in which a few opinions are given and some numbers are produced but no arithmetic is used to connect these. Here goes…

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Triple Glazing, Right?

Normally for a well-insulated house you'd think putting in triple glazing would be a bit of a no-brainer as the price penalty for 3G is getting smaller, even in the UK. However, for the roof windows required for an A-frame-type house things are a bit more marginal and it seems worth doing the arithmetic.

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Resistance is Stainless

A couple of weeks ago Paul at the End Of The Road was wiring up some little bus bars using aluminium and M5 stainless bolts. I commented:

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