An Eccentric Anomaly

Ed Davies's Blog

Do radiators radiate?

Specifically, do the sort of metal devices that Europeans tend to screw to their walls and run hot water through in order to heat their houses radiate much heat, as opposed to transferring it to the room by convection and conduction? Similarly, what proportion of the heat emitted by underfloor heating is in the form of thermal radiation?

Of course they radiate some heat. However, it's commonly said that they work mostly by convection and conduction. I think that's right and it's quite reasonable to call them convectors for this reason. Unfortunately, some people get a bit carried away with this and say that radiation is completely negligible. I don't think that's quite so right.

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Infrared Myths

I see a lot of confusion about infrared when it comes to interactions with buildings, astronomy and so on. Here's a bit of a brain dump to refer to in such cases which I hope will throw some light, of various wavelengths, on the matter.

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House Energy Budget

I'm quite confident of having plenty of energy for most of the year in my house. The two months or so of the worst bit of the winter are a bit tricker.

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Access!

I can now drive on to my land. Starting Wednesday last week the contractors (JW Sinclair) put in the entrance, track, and parking and turning space and cleared the topsoil down to clay for the house site.

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Gorse and Willows

I'm busy waiting for the structural engineer to come back with design details and the roads department to issue a road opening permit so I can get the contractors in to make the entrance, access track and parking area to the north of the house.

In the mean time I've been mucking with vegetation a bit. Not the greatest use of my time but it at least gives the feeling of getting stuff done which is better than getting frustrated at the rate the year's slipping by.

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A Rant About Kilograms On Mars

The CACM have published a reasonably interesting article by Gerard J. Holzmann about verification of the software on the Curiosity Rover: Mars Code.

Near the beginning, though, it says:

On Earth, Curiosity weighed 900 kg. It weighs no more than 337.5 kg on Mars because Mars is smaller than Earth.

Nope!

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Vapour Resistance of OSB

In the past there's been a lot of confusion in discussions on the Green Building Forum (GBF) about the ability of OSB to impede or allow the transfer of water vapour. This is quite significant as OSB is a handy and cheap material for wall and roof constructions where movement of water vapour is a significant concern (although by which modes and in which directions is also a bit controversial).

Somebody using the pseudonym “A.L.” on the Navitron Forum sent me some references and discussion regarding my concerns about my roof build up following on from discussion on the GBF: Ventilation gap under sarking board which might throw some light on the inconsistency of quoted OSB vapour performance values.

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Interior Design

After a couple of rather numeric posts it's time for something a little more entertaining. I've previously shown some images of the planned exterior of the house but not said much about the interior design so …

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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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