Latest: Chelsea 4 Maribor 0 – Blues heading for resounding victory

first_imgDidier Drogba’s penalty – his first goal since returning to Chelsea – helped put them in a commanding position in the Champions League Group G clash. Drogba scored eight minutes after coming on for Loic Remy, who injured himself while scoring the opening goal to put the Blues in control, and John Terry’s breakaway strike and an own goal by Mitja Viler made it 4-0.Remy collected Terry’s pass and shifted the ball on to his left foot before firing into the far corner of the net to put the Blues ahead.However, the France striker, who appeared to pick up a groin strain early on, seemed to aggravate the problem as he struck the ball and after limping on for a couple of minutes he was replaced by Drogba on the quarter-hour mark.Drogba had last netted for Chelsea when he scored the Champions League-winning penalty in the shoot-out against Bayern Munich in 2012, having also got their all-important equaliser.And he made no mistake from the spot after Ales Mertelj handled as he attempted to block Willian’s ball into the box.Terry’s was a nicely worked goal, Eden Hazard cleverly finding Cesc Fabregas whose low cross teed up the skipper for a simple close-range finish.Chelsea continued to dominate after the interval and went further ahead courtesy of some good fortune on 54 minutes.Hazard retrieved Filipe Luis’ cross at the far post and when the Belgian steered the ball back towards the goalmouth it was diverted into the net by the unlucky Viler.Maribor were then awarded a penalty and a chance to pull a goal back when Agim Ibraimi was bundled over by Nemana Matic.But Ibraimi thumped his spot-kick against Petr Cech’s left-hand post. Chelsea: Cech; Ivanovic, Zouma, Terry, Filipe Luis; Matic, Fabregas; Willian, Oscar, Hazard; Remy (Drogba 15) Subs: Courtois, Azpilicueta, Cahill, Ake, Salah, Solanke.Follow West London Sport on TwitterFind us on Facebooklast_img read more

What’s a Blower Door Good For?

first_imgAn alternative way to explain air leakage to homeownersDefenders of the ACHnat make the seemingly valid point that it’s conceptually easier to explain to homeowners. When you extrapolate from a house under test pressure to a house under “natural” pressure differences, the ACHnat tells you how quickly the air in your house is exchanging with outside air.If, for example, a house comes in at 0.5 ACHnat, the energy auditor will tell the homeowner that all the air in their home is exchanged with outside air every two hours. Yes, it’s an easy concept for homeowners to grasp, but, as I’ve shown above, it’s not true.There’s another option here that has far less uncertainty. Blower door results can be turned into leakage areas. The two main ones are Effective Leakage Area (ELA) and Equivalent Leakage Area (EqLA). Both attempt to quantify the size of the hole based on the cfm50.Another relation that I use also turns cfm50 into hole size: Each 1000 cfm50 is approximately equal to 1 square foot of hole. Don’t believe it? Set up your blower door and try it. Run your test as normal and find your result. Then go to the other side of the house and add a 1 square foot hole. You can do this most precisely with saws, but homeowners and builders probably won’t appreciate your leaving a permanent hole. I usually open a window and measure it to get one square foot. Run the test again, and you’ll find that it’s approximately 1,000 cfm50 higher.So if you’ve done a blower door test and the result is 6,240 cfm50, the house has a hole that’s about 6 square feet. Point to that 2030 window in the kitchen and tell them that they’ve got a window that size completely open to the outside, 24/7/365. I’ve found that to be just as effective as telling them how many times the air in their house exchanges… and I feel a lot better about my truthfulness when I do so. Allison Bailes of Decatur, Georgia, is a speaker, writer, energy consultant, RESNET-certified trainer, and the author of the Energy Vanguard Blog. You can follow him on Twitter at @EnergyVanguard. The problem with extrapolationWhat the blower door cannot do, however, is tell us anything about the pressure differences that the home experiences. When the blower door is operating, it puts the house under a controlled pressure difference. When the blower door is not running, the pressure in the house varies season to season and moment to moment. The main driving forces for those changes are wind, the stack effect (warm air rising in the house), and mechanical systems.Calculating the ACHnat based on a single point test attempts to factor in the effects of wind and stack effect, but at great cost to the precision. You go from ~3% uncertainty to 20%, 30%, possibly even 50% or more. I don’t think it’s helpful to tell a homeowner, “Your home leaks at the rate of 1 air change per hour — but it could be as low as 0.5 or as high as 1.5, and if you’ve got problems with the mechanical systems, it could even be 2 or more air changes per hour.”Pressure differences created by mechanical systems can eclipse those created by wind and stack effect. The disconnected supply duct, the leaky panned return, the 1200 cfm commercial range hood with no makeup air — all these things can dwarf the effects we’re trying to capture in ACHnat. Now, the blower door is really good at telling us about the pathway, that is, the hole in the house. The more air flow a blower door measures, the bigger the hole in the house. (When I say “hole,” singular, I’m referring to the sum of all the leakage sites.) It doesn’t tell us anything about the distribution of the holes or their individual sizes and shapes, although we can walk around with the blower door running and locate the larger leaks. Joe Lstiburek wrote a great article about this last year: Just Right and Airtight. Blower doors help us estimate how big the holes areI believe that the pathways for air leakage are really all we need to be concerned with when we’re talking about blower door results. If a house has a hole, we want to know how big it is, if it’s small enough to meet the code or program requirements, and what we can do to make it smaller. That’s what the blower door is good at. We can still help builders and homeowners without extrapolating to the point of meaninglessness if we just focus on the hole.My point about normalizing the (almost) raw number, cfm50, to the surface area rather than the volume makes sense when you see it this way. If you’ve got a hole in the building enclosure, you compare it to the size of the building enclosure, not the volume.Yes, pressure differences are important, but let’s understand the limitations of the blower door. It’s great at telling us about the pathways for air leakage through the building enclosure. It can’t tell us anything about the “natural” pressure differences a building will experience.If we have this tool — the blower door — that gives us numbers with a precision of +/-3%, why would anyone want to manipulate the results into something with uncertainties of 20%, 30%, possibly even 50% or more?!It’s time to quit using ACHnat to talk about infiltration.center_img Air leakage and blower door basicsAir leakage happens when you have both of the following:a pressure difference, anda pathway.If the pressure outside a building is the same as the pressure inside, you can open all the windows, and little air will move through them. Likewise, you can have a huge pressure difference across the building enclosure, but if there are no holes, there’s no air leakage. So, if you eliminate one or the other of those two conditions, you eliminate the air leakage. RELATED ARTICLES In last week’s blog, I suggested that talking about infiltration rates in terms of air changes per hour isn’t an accurate way to portray air leakage. The problem is that you’re dividing by volume but the leaks happen at the surface. I don’t think ACH50 is going away anytime soon, and I use it myself because everyone else does, even though it’s biased toward larger houses.The quantity that drives me bonkers, though, is ACHnat, which stands for Air Changes per Hour under “natural” conditions. Every HERS rater and BPI class teaches people how to calculate this thing and what it means: A house with 1 ACHnat exchanges all it air with outside air once each hour. The only problem is that it isn’t true. Let’s start from the beginning. Blower Door Testers Wanted — Scientists and Engineers PreferredHow Much Air Leakage in Your Home Is Too Much?Air Leaks Happen at the Surface, Not in the VolumeBlower Door BasicsQuestions and Answers About Air BarriersPinpointing Leaks With a Fog Machinelast_img read more

All that matters in life is cricket

first_imgI love cricket, all 24 hours of it. Even if it is a Kenya-Canada match. For a spectator like me, cricket is one of the primary motives for living.In fact, in recent years cricket’s move from playing field into drawing room, bar, movie hall, newspaper ad, television commercial, phone tweets and downloads, T-shirt, office computer, wall calendar, including cricket’s appearance on shot glasses, table mats, home crockery and cutlery, has added thrills to a sport once restricted to the playing field.Cricket is life. I can watch it for 12 hours on TV, then – during working hours – switch to the office computer. When I am on the move I can see it on my mobile, or download expert comments for a discussion with friends. In a cricket bar you can give me the finest scotch or a glass of warm buffalo milk. If Brett Lee is bowling to Viru, I couldn’t care less.OmnipresenceLuckily, something to do with cricket is on television all the time – a match, an analysis of a match, a rerun of a match, a rerun of a rerun?. In a 24-hour day, somewhere, in some part of the world there is daylight, so cricket is being played. If you are in the Indian time zone then get set to spend the working day watching the India- Bangladesh- Pakistan Triangular at Kanpur. At close of play, when your eyes have absorbed eight hours of cola commercials and your head is a catalogue of fresh statistics, you can switch channels to catch England’s tour of South Africa for the next eight hours.advertisementBut as soon as night falls in Pretoria, you can switch to the Australia- West Indies test at Barbados. I always make sure I keep the remote; that way I can also keep checking on the Sussex- Middlesex county match on ESPN. At a recent World Cup match the stoning of the West Indian team was a minor oversight by some irate Bangladeshi fans wishing to target their own loosing team. But a loss in the World Cup is a humiliation few democratic societies will tolerate. So what if the women are in purdah, and the kids are not in school. The idea that a country’s patriotism is based on the outcome of a game played by only 14 countries is a loss difficult to bear. During the particularly gruesome Tri-series in 1993 in Dhaka, in which only one nation took part, the now famous fielding triumph by Rasheed Ahmed at deep third man is the stuff of history books. Rasheed being Rasheed, and having been coached by his chemistry teacher threw himself at a ball that was speeding towards the boundary. And again, Rasheed being Rasheed, missed the ball completely, but for some reason the ball, swished soundlessly along the grass, and stopped just short of the boundary.Bangladesh won the match by one run, and Rasheed was hailed the architect of the victory. For his performance, the government made him an MP from Chittagong.But for missing the ball, he was shot by a firing squad.Once at Lords, a match was being played during the Round Table Conference of 1936, between the Queen’s XI and the Indian Freedom Fighters XI. Ramsey MacDonald had suggested the match, as an attempt to patch up differences, and having played Ranji Trophy for Gujarat, Sardar Patel happily agreed. But tensions arose during the second innings, when Mahatma Gandhi was at the crease. After sixteen consecutive maidens, in sheer frustration, Gandhi sent the ball speeding across the grass with a fine cut towards deep third man. Everyone was surprised that a man who had put up such a spirited fight against South African apartheid, would be content with a mere boundary down the off side. Fielding the shot was none other than Winston Churchill, who refused to pick up the ball. Later at a news conference, he explained, “I will never bend down for that naked fakir”. As a consequence of Churchill’s action – rather inaction – India won the match by three runs. Unable to stomach the humiliation, the British left India soon after.Cricket’s role in world negotiations too cannot be denied. Some years back when the world economy was in a mess and Manmohan Singh was attending an emergency meeting of the G-20 in London, during an afternoon session on the role of the World Bank, there was an active discussion on Virat Kohli’s jersey number between Gordon Brown and Nicolas Sarkozy.Nature Brown maintained that Kohli had dropped his lucky No. 27 after India’s loss in the 2006 President’s Cup. Sarkozy, in the usual way of opposing anything English, insisted that the change was made after the 2004 debacle in Pakistan. For resolution, the two had turned to Manmohan Singh only to be given a vague unsure response, despite the 900- strong Indian delegation. The meeting broke up soon after, and Singh returned to India.advertisementObviously injuries are rampant in any sport where eleven men in sparkling white clothes straight out of a surf ad stand around listlessly on freshly mowed grass for five days. Many have been carried out on stretchers after a tiresome fly has buzzed around a member of the fielding side and has diverted his attention from the young actress sitting braless at the pavilion end.Such is the complex nature of the game that it allows a complete participation in life’s other activities. Cricket is in fact the nearest thing to philosophy, except in philosophy you sweat a little more and aren’t allowed breaks for tea. Besides, if you get stuck on those thorny issues about the nature of nature, or existance vs. existence, you can’t have a philosopher walk in from the pavilion and do your thinking for you.I remember when Anil Kumble was fielding at Point during the 1995 India- Australia match, he had the sudden urge to write a love note to his wife.Memorabilia Just newly married, this was natural.Anil pulled out a ream of A4 sheets, and lay down on the grass to write. Being a 5- day match there was plenty of time. He had written some 40 odd pages when Ponting – out of sheer spite for his productivity – sent a ball in his direction.Anil continued writing but leaned slightly to field the ball and send it back to the bowler. By the second day he had a first draft ready, almost 180 pages. He put these on a laptop, borrowed from Srisanth, and went off to call Penguin India. Before the match ended, Anil not only had a complete manuscript as well as a publisher, but also an agent in London who wanted all South Asian rights.Besides, the match had been successfully concluded as a draw, and as part of the semi- victorious Indian team, Anil was given a hero’s welcome in Bangalore.Of course the real test of the game’s popularity lies in the annual cricket auction at Christie’s. A finger on the nose, a tilt of the head, the 2006 auction saw a Gujarati liquor baron pick up the plastic Bisleri bottle used by Sachin during the 1998 Sri Lanka India Quadrangular. The same baron also paid a quarter million dollars for two gobs of gum chewed by Rahul Dravid during the 1993 Zimbabwe- India quarter final match.Even the toilet paper used by the Nawab of Pataudi, during the country’s 1973 tour of England has been on view in a special display at the British Museum.Of course the failed robbery attempt in 2007, led to tightened security around the popular exhibit, which today is surrounded by round the clock electronic surveillance. Sadly, because of the sealed enclosure, many visitors from India can no longer smell the exhibit, and leave disappointed.advertisement- The writer is a well known architectlast_img read more