- Date
-
- All
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- Type
-
February 28th
Energy prices in Europe have continued to increase in 2011 by almost 15%, and should continue to grow if crude oil price remain above $100/bbl. Past crude oil price increases have impacted households’ energy bill strongly. Will housing energy expenditures continue to be impacted the same way in the future?
Read full story February 27th
In the washroom of a single-family home new lamps were installed around 1970 (Fig. 3.15). The new luminaires were refurbished with electronic starters in their very early days. Since then, one of the lamps has been replaced once and the other one never ever. Neither has any of the starters, of course.
Read full story
Unfortunately a substantial excess in pre-heating current also adds to the ageing impact of start-ups if current is really excessive, while pre-heating is basically essential to reduce the wear effect of starting procedures.
Read full story
At least this is what you would hope for. In fact, the luminaire is fed with AC, and whether the instantaneous current value at the instance of ignition, that is, of contact opening, is high enough right at that moment to generate a sufficiently high voltage impulse is an open question.
Read full story February 15th
Since before the invention of the incandescent light bulb, lighting in the home has been accomplished by the use of point light sources. As candlelight and gas lamps transitioned to electrical lighting, room light sources continued to be localized, either as light fixtures in the ceiling, or as lamps or accent lighting located for specific uses like reading or security lighting.
Read full story February 14th
Until recently, the main point of discord in the climate debate surrounded the opposition of investing in fossil fuels as opposed to investing in renewable sources. Since the Fukushima accident in 2011, the discussion has shifted towards the merit of investing in nuclear against investing in renewables, with the potential side-effects of nuclear technologies overshadowing the potential externalities of carbon emissions in the public debate. However, given the present and projected future technology costs, is such a divide well-founded when considering long-term climate goals?
Read full story February 6th
Concentrated PV systems can deliver electricity at costs below grid parity if produced in quantities above 150 MW per year, according to Israeli engineer Dov Raviv,.
Read full story Pages
