Sunday, 30 October 2011
I have seen the light
Tuesday, 25 October 2011
"We applaud the well-mannered box"
Sunday, 23 October 2011
Architecture: Political, risky and unexpected? No, thank you!
Thursday, 20 October 2011
Dimmers getting dimmer and dimmer and I'm not sure I can see the light any more
Tuesday, 18 October 2011
Please help me, I know too much
Sunday, 16 October 2011
Pictures of windows - not recommended for any over-excitable readers - contains explicit pictures (of windows)
Just been going through the photos again and making many more albums and removing a tiny number of photos. Not sure if progress is going in the right direction.
I had just been throwing any pictures of windows into a "windows" folder--eat your heart out Bill Gates--but decided they should really be grouped with pictures of the same window. It was a bit tricky in a few places to work out which rectangular shape on a flat wall was being represented. I wish the computer would help, as it tries to do with pictures of people. They're getting better and better at face-recognition, but wall-recognition and even angle-of shot recognition in general have a lot of work to do. Perhaps it should be up to GPS and direction-sensors in the camera.
Anyway, among over 300 shots, there wasn't much fairness in the distribution between the 18 windows in the house. There were over 30 of the upstairs window on the west wall. I think my desk may end up under this, so I will probably continue to spend a lot of time looking at it. I've just noticed that in around the third shot the handle suddenly switched from the right side to the left side. This must have either been put in upside down, or switched for another window.
There were only two shots of this window in the washitsu, the Japanese room, at the north of the house. Here's one of them. I should probably start taking more pictures of this.
Actually the most pictures were taken of this window on the north, although most of them were taken, at around 10-second intervals, while it was being installed. As usual, among most of the pictures several were identical, where I've been diligently charting progress on a daily basis of a process that is characterised by weeks of stagnation and then rapid change.
I think my favourite is this one in the kitchen though. Notice the sockets to the right creeping around with our prevarications.
Thursday, 13 October 2011
Early house guests
I started writing this message on July 28th, the day after a visit to
the house by a delegation viewing plus-energy houses.
I didn't take any pictures of them, but here is a list of the people
who visited the house to see the insulation and airtightness work. I
may have some of the names wrong. Sorry!
Hiroshi Ishiguro from Kyoei House in Chitose city, Hokkaido, the
northernmost island of Japan.
株式会社 協栄ハウス 北海道千歳市 石黒浩史
http://www.kyoueihouse.jp/
Takahiro Suzuki and Shigeichi Saruta from Suzukiyo in Noshiro city,
Akita ken up north.
株式会社 鈴喜代 能代市秋田県 鈴木隆宏 猿田茂一
http://www.suzukiyo.com/
Mr. Mikame and Mr. Kabashima of Tokyu Homes in Shibuya ward, Tokyo.
株式会社 東急ホームズ 東京都渋谷区 三瓶 樺島
http://www.tokyu-homes.co.jp/corporate/profile.html
Hideo Tomita from Hideo Tomita studio in Nerima ward, Tokyo.
富田秀雄建築アトリエ 東京都練馬区 富田秀雄
Hideyuki Motobashi from Altas Ever in Yokohama city, Kanagawa, South
west of Tokyo.
アトラスエヴァ株式会社 神奈川県横浜市 本橋秀之
Kei Kato from Atelier Kei in Kamakura city, Kanagawa.
アトリエけい 神奈川県鎌倉市 加藤景
Two Kusakaris and a Mr Yoshida from Macklife in Yokohama city, Kanagawa.
株式会社 マックライフ 神奈川県横浜市 草刈 x 2 吉田
http://www.macklife.co.jp/
Mr. Sekine of Channel Original, Wooden siding manufacturers in Yokohama.
チャンルオリジナル株式会社 神奈川県横浜市 関根
http://www.channel-o.co.jp/
Messrs. Ishizaka, Oyama, Higashino, Odanaka from Gadelius in Minato ward, Tokyo.
ガデリウス 東京都港区 石坂 尾山 東野 小田中
http://www.gadelius.com/
Mr. Sasaki from Nagano P.S. in Nagano city.
長野ピーエス 長野市 佐々木
http://www.dcn.ne.jp/~ren/text/menu.html
and of course Messrs. Egawa and Kobayashi from Shinetsu BIB in Nagano.
信越BIB 江川、小林
It felt nice to have so many visitors, and a few of them said thank
you, that they had learnt something and that it had been interesting.
Some of them just scowled. None of them introduced themselves.
To give some context, apparently the purpose of this visit was to
persuade a skeptical group of the merits and techniques of glass wool
insulation, so their scowling may have been towards the host of their
tour and his apocryphal techniques, and not just a sign of rude guests
in my house.
One guy brought some cakes as a gift. I wish I knew who, so I could
say thank you.
Perhaps I should have been a bit more assertive, although it seemed
like a good opportunity to talk to the electrician and site foreman,
and actually get some practical decisions made, so I stayed out of the
house when they were all inside. Also, I felt there was a danger of me
breaking into some kind of argument either with the architect or the
insulation guy, so it seemed safer to avoid the conflict and loiter
under the scaffolding.
As it was, my architect was evidently standing there holding court
about why and how he'd made all the decisions on his house, when in
fact for most of the time he has been misunderstanding or sneering at
them.
Meanwhile under the scaffolding some important solidarity was built up
with the site foreman and electrician, who are doing a lot of the real
work to build the house, rather than drawing pictures that aren't even
particularly pretty.
Tuesday, 11 October 2011
Science East and West
Sunday, 9 October 2011
Buying lights
Friday, 7 October 2011
Low-voltage tension cables. Back to parallel not series
The electrician has been correspondeding with Nayuta, manufacturers of constant current power supplies, and they had the perfect model, with the right voltage and the right range of currents that could be varied. The problem was, they did not know how to vary the current. The power supply has a screwdriver trimmer wheel on it, and there are terminals to connect something to vary the current, but they do not have the something, nor could they, or the electrician, find one. If you can understand that, please explain it to me, because it does not make sense.
I also found some power supplies from AudioQ (Japanese only), with volume controls, which looked promising. They put out up to 350 milliamps, which should be about right for a 12 volt, 4 watt bulb, between 2 and 26 volts.
We want 3 bulbs on one circuit, which at first I thought would be no problem--they would just not come on at full brightness. Then I remembered the VI curve for LEDs and that the D is for diode. If there is much less than 12 volts going through each LED, or 36 volts total, then they will not come on at all, however many amps are available.
So this would only work if we had two bulbs on each circuit. Also, the electrician seemed much happier with something in a box, rather than having to install a bare circuit into the wall.
There is another nagging worry though. Even if the current could be adjusted, and the voltage kept at suitably high, would the bulbs actually respond properly, or would their circuits mess things up?
I'm sure the parts must be out there somewhere, but after a few months of searching we haven't been able to find them, so it's time to go to plan B, which is to use a standard voltage dimmer switch, get LED bulbs that work with dimmer switches and hope for the best. The danger with this is incompatibility between dimmer and bulbs, leading to flickering. As there are three bulbs, one of them may flicker at any level, and we'd be left with an elaborate on/off switch.
I'm about to order some lumilux fully dimmable LEDs from EarthLED, which apparently work with magnetic transformers and dimmer switches. These seem to be available, although the electrician's first suggestion was a switching power supply and a pulse wave modulation (PWM) dimmer switch. As each of these, and no doubt the controller within the dimmable LEDs, are electronic circuits, each with their own frequencies, the chances of interference, harmonics or beats is quite high.
Not at all relevant, but here's another constant current, non-variable, power supply.
Wednesday, 5 October 2011
Prevarication, procrastination and still in the same house at the beginning of another winter
Monday, 3 October 2011
Dimmable bulbs
I visited Hisashi's bar, Oread, in Tatsuno the other day, and he was saying he wanted to change his lights to LEDs, but had been told it was impossible. He puts on live music in his bar and would like to use LEDs for his stage lights, and adjust them with the row of dimmer switches.
So, if all you need to do to dim an LED is change the current, then why would any LED NOT be dimmable?
The problem is that whenever an LED is packaged into a bulb or fitting, some electronics are added. This is essential to put a cap on the current or voltage and stop a melt down. So the question is whether the bulb has a one-size only approach, and will only send a specific current through the LEDs, or whether it has a cap, and will allow any current to go through, as long as it is no more than the limit.
If the electronics will only send the designated current, then all bets are off regarding dimming. If there is not enough power going into the light, the required voltage will not be reached and no current will flow. LEDs may not obey Ohm's law, but they do obey P = V I. The power will always be the product of the voltage and current. This is sometimes erroneously referred to as Watt's law, but Watt actually had nothing to do with electricity, and the unit we use for electricity was given his name posthumously. P = V I is actually a Joule's law, or a combination of P = I2 R with Ohm's law, V = I R. Back to the LEDs with fixed current internal power supplies, either there will be enough power, and the voltage will be high enough for the full current to flow, or there will not be enough, and no voltage will flow. However fancy the dimmer circuitry on the outside is, dimming won't happen.
If, on the other hand, the electronics put a limit on the current and will only allow current to flow below the meltdown level, then we're in with a chance.
Anyway, there are plenty of dimmable LEDs, in the sense of dimming with a conventional dimmer. Here's one from the US:
I'm only really looking at MR16 GU5.3 bulbs at the moment. These are low-voltage halogen types that I need for the tension wire system.
I got some E17 bulbs for around eight or nine hundred yen to play around with and try out in various appliances we already have. On the bulb instructions, it said we should not, under any circumstances, use the bulb in a fitting with a dimmer, so we tried it in a desk light with a dimmer. Nothing really exciting happened.
As we turned the switch up, first of all, nothing at all happened. Then the light came on, flickering very quickly, almost too quickly to notice, a little below full brightness, then it flashed in one pattern, then flashed in another fashion, then came on at full brightness. What seemed to be happening is that the dimmer on the desk light was interfering with the circuit inside the bulb.Sharp have a regular lightbulb-like LED, left, which will apparently change brightness.
This site from KC Lightech also boasts dimming LEDs, in GU5.3. It looks like Cree LEDs inside. They recommend a Panasonic power supply. I wasn't sure how I could actually buy them so I called. They have no stock and will ship an order of a hundred. I only want six!There is a Philips light here for 6,384 yen a throw, 10W, which can dim, depending on the power supply. They don't always work, but do with Maxray, Daiko, Endo and Koizumi.
This 5.5 W light from Decolight is only 1,200 yen. although it doesn't mention which power supplies it will work with, and careful inspection reveals that it is 100 volts AC. And I thought MR16 GU5.3 was a 12 volt DV size.
Saturday, 1 October 2011
Fred took some photos of the house the other day with his old Nikon and wide angle lens. It was a terribly rainy day, so the pictures are all inside. Apparently that's not a bad thing as the light is well dispersed. He was using a flash anyway.
These pictures are unusual as I'm in them. Also, there is an incredibly rare shot of me actually doing something useful in the house, rather than getting in the way, complaining and giving impossible demands.
I will always look at the bookshelf on the balcony with pride, as I had a part in its construction, even though it was only holding it up for about five seconds. I hope you like the way the carpenter and I wore matching T shirts too!