February 23, 2020

Mavericks guard JJ Barea has season-ending Achilles tear

first_imgKevin Durant out with Achilles injury; to undergo MRI on Tuesday PLAY LIST 03:12Kevin Durant out with Achilles injury; to undergo MRI on Tuesday00:50Trending Articles00:50Trending Articles02:14Carpio hits red carpet treatment for China Coast Guard02:56NCRPO pledges to donate P3.5 million to victims of Taal eruption00:56Heavy rain brings some relief in Australia02:37Calm moments allow Taal folks some respite03:23Negosyo sa Tagaytay City, bagsak sa pag-aalboroto ng Bulkang Taal01:13Christian Standhardinger wins PBA Best Player award Barea was technically the backup to starting point guard Dennis Smith Jr., although the 21-year-old in his second season has missed 14 games, mostly with a right wrist sprain.Smith’s absence has made the versatile 19-year-old Doncic the starter at the point. Once Smith is healthy, Barea’s injury could increase his presence in the rotation.There’s no question Brunson will get more opportunities after his role has varied widely through the first half of the season. While he has spent most of the season in the rotation, he’s had stretches where he played sparingly or not at all.After Barea’s injury, Brunson hit a big 3-pointer late in the fourth quarter against the Timberwolves before Doncic scored seven straight Dallas points, the last on a 3 that put the Mavericks ahead for good with 23 seconds left.The injury to Barea came against the only other team for which the native of Puerto Rico has played.ADVERTISEMENT Sports Related Videospowered by AdSparcRead Next He signed a four-year, $17 million contract with the Timberwolves after winning the title with the Mavericks. Barea returned to Dallas after agreeing to a buyout of the final year of the deal with Minnesota. He’s in the final season of a four-year contract with the Mavericks. Ginebra beats Meralco again to capture PBA Governors’ Cup title View comments Dallas Mavericks’ J.J. Barea, right, prepares to lay up as Minnesota Timberwolves’ Jeff Teague defends in the first half of an NBA basketball game Friday, Jan. 11, 2019, in Minneapolis. (AP Photo/Jim Mone)The Dallas Mavericks have lost an important piece in their push for a return to respectability with guard J.J. Barea’s season-ending Achilles injury.Barea tore his right Achilles tendon in the fourth quarter of a 119-115 victory at Minnesota on Friday night. The team said Saturday that Barea was weighing his options for surgery.ADVERTISEMENT Don’t miss out on the latest news and information. Will you be the first P16 Billion Powerball jackpot winner from the Philippines? Philippine Army to acquire MANPADS, self-propelled howitzers Japeth Aguilar wins 1st PBA Finals MVP award for Ginebracenter_img Gretchen Barretto’s daughter Dominique graduates magna cum laude from California college Tom Brady most dominant player in AFC championship history MOST READ Nadine Lustre’s phone stolen in Brazil Ginebra beats Meralco again to capture PBA Governors’ Cup title The 34-year-old Barea was averaging 10.9 points and a team-high 5.6 assists as a key part of the second unit for Dallas. The injury is likely to mean a significant increase in playing time for rookie Jalen Brunson, a two-time NCAA champion at Villanova and second-round draft pick.Barea is in his second stint with the Mavericks after being a catalyst for Dallas’ rally from a 2-1 deficit in the 2011 NBA Finals against Miami. The Mavericks won the franchise’s only title in six games.FEATURED STORIESSPORTSGinebra beats Meralco again to capture PBA Governors’ Cup titleSPORTSJapeth Aguilar wins 1st PBA Finals MVP award for GinebraSPORTSGolden State Warriors sign Lee to multiyear contract, bring back ChrissBoosted by a sensational rookie season so far from third overall pick Luka Doncic, the Mavericks are seeking a return to the playoffs after falling out of the race early and finishing near the bottom of the Western Conference the past two seasons.Losing the trusty veteran presence of Barea won’t help. He was a big part of what made Dallas deeper than it has been in several years, with his pick-and-roll ability and playmaking in the lane helping the offense’s efficiency. In fight vs corruption, Duterte now points to Ayala, MVP companies as ‘big fish’ LATEST STORIES OKC Thunder to retire Nick Collison’s No. 4last_img read more

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Region 1 hosts mini STEAMS Fair

first_imgThe Education Department of Region One (Barima-Waini) hosted a mini Science, Technology, Engineering, Arts and Mathematics (STEAMS) Fair and Exhibition on Saturday on the lawns of the Education Department in Mabaruma to officially begin activities in observance of Education Month 2018, celebrated under the theme “Education for a Good Life – Through Innovation and STEAMS”.Regional Chairman Brentnol AshleyIn delivering remarks at the event, Assistant Chief Education Officer-Primary (ACEO-P) Owen Pollard reminded the gathering of students, teachers and parents that without an effective education system a country cannot progress.Pollard said it is towards this end that the Education Ministry (MoE) will leave no stone unturned to educate the nation’s children in keeping with modern methodologies and concepts. With a focus on the theme, Pollard said it is imperative that an education system in the 21st century produces children who are able to function in the wider world.He is quoted by the Department of Public Information as saying that, “as a country we need scientists and other technically savvy citizens to guarantee Guyana taking its rightful place in the world”.Brentnol Ashley, Regional Chairman for Region One, said making education a priority irrespective of any prevailing circumstances is a mantra his region reverences highly. He said, “Children will have the opportunity to unravel the skills they have within,” Ashley quipped.Further, he noted that it is important to ensure that every child has an opportunity to maximise their potential and leaders should assist in ensuring such opportunities are provided.The Regional Chairman told the gathering that his region will be expending more monies for the continued development of education in Barima-Waini. “Education is everyone’s business, unless we take ownership of education and place emphasis on its importance much will not be achieved, for a society to be transformed education has to take its rightful place”.Meanwhile, District Education Officer (Region One), Marti DeSouza was in a celebratory mood because his region in keeping with the theme this year, established their first smart classroom. According to DeSouza, this technology will substitute for a teacher who might be absent since children from another school can be taught by another teacher from a separate school.The use of the smart classroom was demonstrated at the exhibition whereby students were given a Mathematics lesson on subtraction with regrouping.The schools participating were Mabaruma, Hosororo, Wauna, Aruka and Barbina Primary schools and North West Secondary.Following the opening of the Fair, the Welfare Department presented school supplies, inclusive of bags, footwear and exercise books to a number of students.last_img read more

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Man City go head-to-head with Arsenal for Argentina striker

first_img1 Manchester City are now the favourites to prise Gonzalo Higuain away from Napoli this summer.talkSPORT told you yesterday that Arsenal had made contact with the Serie A club about a possible move but were instructed to increase their initial bid of £42m.According to Tuttomercatoweb, City are also preparing a similar offer for the Argentine striker but it is thought they would be willing to up their bid if Napoli demand it.Manuel Pellegrini is looking to beef up his strike-force next season and sees Higuain as the perfect foil for fellow Argentina hitman Sergio Ageuro.City will also be able to offer Higuain Champions League football next season although the Blues could still face competition from Manchester United and Atletico Madrid for the 27-year-old. Napoli’s Gonzalo Higuain last_img read more

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Miller nearing return

first_img Switch it up? Before Tuesday’s game, coach Andy Murray said he was considering starting Jason LaBarbera in goal Thursday against Atlanta, but LaBarbera got some work Tuesday when he replaced Mathieu Garon after one period. Including Tuesday, Garon has started 19 of the Kings’ past 21 games, but LaBarbera had a three-game conditioning assignment in the American Hockey League last week and Murray would like to keep him fresh. “The way I was in practice (Tuesday), I hope that can carry over, because that’s the best I’ve felt in a long time,” LaBarbera said. LaBarbera, who started the season with a 5-0 record, has an 0-3-2 record since Nov. 3. He played three games in Manchester of the AHL, where he had a stellar 2004-05 season for Hartford, and had a 1-1-1 record in his conditioning assignment. Yes, again: The Kings’ season of attrition took another predictable turn Tuesday when Alexander Frolov had to be scratched because of flu-like symptoms. The Kings recalled Matt Ryan and Richard Petiot, and both played Tuesday because the Kings also were without Eric Belanger, whom they had expected to return until he reinjured his groin Monday. That meant Petiot got to make his NHL debut, the seventh King to do so this season. With the Kings short one forward, Murray said before the game that he might use Petiot, a defenseman, as a winger. Almost ready: Lubomir Visnovsky missed a second consecutive game with a cervical strain, but skated Monday morning. Murray said Visnovsky remains on track to return Thursday. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! By Rich Hammond, Staff Writer Aaron Miller, out nearly a month with severe back pain, has made great strides in recent days, and cracked wise when asked when he thought he might be able to resume practicing with his Kings teammates. “Hopefully soon,” Miller said. “I’d like to meet some of those guys.” KINGS NOTEBOOK Miller nearing return center_img AD Quality Auto 360p 720p 1080p Top articles1/5READ MOREGift Box shows no rust in San Antonio Stakes win at Santa Anita As if on cue, Craig Conroy walked by a moment later, stuck out his hand and introduced himself. Miller laughed, which is something he hasn’t been able to do much of this season. Even before he left the lineup Dec. 21, Miller had been playing in pain for several weeks, but now he seems to be on the comeback trail. “It wasn’t getting much better for a long time,” Miller said. “Now I’m able to do a lot more, as far as strength and getting on the ice. I don’t know how close am I, but at least I can see some sort of light. “I want to get back as soon as I can, but at the same time I don’t want to waste all the time I spent resting my back. I don’t want to come back too soon and be in the same position again.” Miller had a second epidural shot last week, enjoyed a significant improvement and has been skating before practices, but likely would need several days of full-team practices before he could return. last_img read more

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first_imgSUPER STEPHEN!DONEGAL man Stephen Rodgers has completed his solo cycle from Mizen Head to Malin Head – making sure of course he had his Donegal jersey on.The Dungloe man was raising money for leukaemia research.“I made it safely to Malin Head after 4 days and 646 kilometers and I can say my legs are feeling it now,” he laughed. His modesty knows no bounds.Just ask friend Mark Gallagher.He told us: “What Stephen has gone through in the past eight years having had leukaemia and both his hips replaced put his achievement of his cycle into perspective for all of us and should help us see what can be achieved instead of what can’t!”  HE’S MADE IT – STEPHEN COMPLETES MIZEN TO MALIN IN HIS DONEGAL TOP! was last modified: September 14th, 2012 by BrendaShare this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Telegram (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Skype (Opens in new window)Click to print (Opens in new window) Tags:HE’S MADE IT – STEPHEN COMPLETES MIZEN TO MALIN IN HIS DONEGAL TOP!last_img read more

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‘We call him the low-key GOAT’: A’s club option on Yusmeiro Petit may be easy money spent

first_imgFlash back a few months to the summer’s rise that preceded a hard October fall: in particular, a 4-3, extra-inning mid-July comeback win against the Astros in Houston that sent a shockwave through the clubhouse a Richter Scale might pick up.In it Matt Olson hit a game-tying, three-run homer off Roberto Osuna in the ninth inning. Ramón Laureano hit a go-ahead single in the 11th. The story revolved around how the A’s defied odds, used flashy heroics to mend an Achilles heel. But behind the …last_img read more

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Bafana score vital away win over CAR

first_img10 June 2013Bafana Bafana enhanced their chances of playing in the 2014 Fifa World Cup with a hard-fought but convincing 3-0 victory over the Central African Republic (CAR) in Yaounde, Cameroon on Saturday.However, Group A leaders Ethiopia won 2-1 against Botswana in Lobatse, making next Sunday’s encounter in Addis Ababa a likely decider of the winner of the group.“The CAR team is really a tough side. They showed it both in Cape Town, and again today. But I am proud of my boys. They had so much belief and worked for each other,” coach Gordon Igesund said after his team’s victory.‘Team spirit’“I like the team spirit. The guys on the bench were celebrating with the players on the field, and that is what builds true camaraderie, which I believe we had today. I just want to celebrate this win tonight (Saturday) and tomorrow I will start thinking about Ethiopia.”Igesund added: “I am proud of the players because since our match with Lesotho last weekend, we had only one training session due to some setbacks we do not want talk about again. Winning 3-0 away from home shows some character. I am happy with the score line, though we dropped a bit in the second half.“We can build the momentum from this result going to Ethiopia.”Neutral venueThe match between Bafana Bafana and CAR was moved to a neutral venue due to political instability in the Central African state and preparations for Bafana were less than ideal as they were first stranded in Douala and missed a day’s training before embarking on a treacherous road trip to Yaounde.The CAR started the qualifier brightly but Bafana Bafana fought off an early onslaught to break the deadlock on 26 minutes through Bernard Parker. The Kaizer Chiefs hitman scored when he was fed by Siphiwe Tshabalala, who had a blinder of a game. After collecting the ball in his own half, “Shabba” slotted it through to Parker, who reacted quickly to beat a CAR offside trap before slipping in the opening goal.Tshabalala then added his name to the score-sheet to make it 2-0 in the 41st minute following a fine midfield interchange with Reneilwe Letsholonyane, which ended with Tshabalala breaking free and rounding the goalkeeper before planting the ball in the back of the net.Parker almost made it 3-0 on 47 minutes, but Emmanuel Yezzoat, in the CAR goal, did well to smother a threatening move. A minute later Khune was called into action to deny the CAR.3-0Moroka Swallows’ star Katlego Mashego, who came on for Parker, increased the score to 3-0 in stoppage time following a solo run by Oupa Manyisa. The Orlando Pirates’ man had come on for Tokelo Rantie.It was a vintage performance by Igesund’s men, setting up what looks like a treat of a game next Sunday. In fact, apart from the opening minutes of the game, Bafana never looked like losing in Yaounde.The defence was impressive and gave nothing away. At the same time, the midfield was effective and the two goals from the midfielders gives credence to their effectiveness.‘Team effort’Bafana captain Itumeleng Khune commented: “I am a big fan of team effort. This is not about me or anyone else but Bafana Bafana. Three goals and a clean sheet, we could not have asked for anything better.“We showed mental strength out there. The approach to the game was positive. That is why we came out tops,” Khune said.“For now, we need to enjoy the victory but must quickly remember that we still have a mountain to climb in Addis Ababa. Both teams have won their matches and they will go into this clash high in spirits. But I am positive we can complete this mission.”With three points safely secured in the bag, Bafana Bafana head to Addis Ababa for what should be a bruising battle for the Group A leadership.StandingsEthiopia remain out front of the group with 10 points from four matches, with three wins and a draw in South Africa. Bafana Bafana are second with two wins and two draws, on eight points.The CAR lies third on three points after a win over Botswana and three losses, two of them to South Africa. Botswana are bottom of the table with one point from a draw with South Africa in Botswana. They have lost the other three games they have played.REMAINING FIXTURES 15 June Botswana vs CAR, Lobatse Stadium, Lobatse15 June Ethiopia vs SA, Addis Ababa Stadium, Addis Ababa  6 September SA vs Botswana, TBA6 September CAR vs Ethiopia, TBA SAinfo reporter and South African Football Associationlast_img read more

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GBA Prime Sneak Peek: Reassessing Passive Solar Design Principles

first_imgRELATED ARTICLESThe History of Superinsulation in North AmericaSolar Versus Superinsulation: A 30-Year-Old Debate Study Shows That Expensive Windows Yield Meager Energy ReturnsAll About Thermal MassCost-Effective Passive Solar DesignPassive Solar HeatOverheating from South Windows Here are the five bedrock principles of passive solar design for a cold climate:The long axis of the house should be oriented in an east-west direction.The rooms where people will spend most of their time should be located on the south side of the house, while utility rooms, bathrooms, closets, stairways, and hallways should be located on the north side of the house.There should be lots of extra glazing area on the south side of the house, and little or no glazing on the north side of the house.The roof overhang on the south side of the house should be designed to shade the south windows during the summer solstice, but to allow the sun to shine through the south windows on the winter solstice.The house should include extra interior thermal mass to soak up some of the solar heat gain that comes through windows on a sunny day.Solar vs. superinsulationIn October 2009, the Passive House Institute U.S. invited me to give a presentation at the Fourth Annual North American Passive House Conference in Urbana, Illinois. In that presentation, “The History of Superinsulation in North America,” I discussed the debate between “solar house” advocates and superinsulation advocates during the late 1970s and early 1980s. After Joe Lstiburek and John Straube saw my presentation online, I was invited to present it again at the 14th Annual Westford Symposium on Building Science (August 3, 2010).Some of the information from that presentation was incorporated into a 2010 GBA article, Solar Versus Superinsulation: A 30-Year-Old Debate.Here’s a quick summary of the relevant history: during the late 1970s and early 1980s, advocates of superinsulation raised questions about the validity of passive solar design principles. A debate ensued, and superinsulation won.Although I’m quite familiar with the historic debate, and I side with the superinsulation crowd, certain aspects of the passive solar approach — an emphasis on careful solar orientation, a concern for proper roof overhangs on the south side of a house, and a preference for south-facing windows over north-facing windows — seem embedded in my DNA.Lately, however, I’ve begun to wonder whether there is any technical justification for these recommendations. Do these design principles result in energy savings? Or am I just dragging around the stubborn legacy of my hippie past?Forget the thermal massSome passive solar principles — especially the old belief in the near-magical effects of thermal mass — never made much sense to me. Thermal mass is expensive. Thermal mass complicates remodeling. Thermal mass makes a home unresponsive to sudden changes in the weather. By keeping a home cold when the occupants want to warm it up, or by keeping a home hot when the occupants want to cool it off, thermal mass is as likely to interfere with occupant comfort as it is is to contribute to energy savings.For most cold-climate builders, the disadvantages of extra interior thermal mass outweigh any advantages. Even radiant floor designers, many of whom sang the praises of thermal mass in decades past, have mostly accepted the new consensus: low-mass floors are easier to control, and result in higher levels of occupant comfort, than high-mass floors. (For more on this issue, see All About Thermal Mass.)This passive solar home in Lafayette, New Jersey was built in 1984. Photo credit: EnergySage.com.How much south-facing glazing?My faith in another passive solar principle — adding plenty of south-facing glazing — was first shaken by Gary Proskiw’s 2010 paper, “Identifying Affordable Net Zero Energy Housing Solutions.” (For a discussion of the report’s ramifications, see my GBA article, “Study Shows That Expensive Windows Yield Meager Energy Returns.”)Briefly, here’s what Proskiw found:South-facing windows are so expensive that the value of the heat gathered by the windows is too low to justify the cost of the windows.Money that a builder might want to spend on extra south-facing windows would be better invested in other energy-saving measures.The area of south-facing glazing “should be limited to that necessary to meet the functional and aesthetic needs of the building.”It turns out that every extra square foot of glazing beyond what is needed “to meet the functional and aesthetic needs of the building” is money down the drain.In a way, this advice is liberating: it compels the designer, secure in the knowledge that no technical or functional issues are at play, to think about aesthetic issues — and that’s almost always a good thing.Proper orientationWhat about orientation? According to conventional wisdom, the wise designer studies a site carefully, looking for a knoll with good southern exposure, and tries to align the long dimension of the house in an east-west direction.Lately, building scientist Joe Lstiburek has delighted in puncturing this balloon. “I don’t think orientation matters anymore,” Lstiburek told me on the phone. “I see passive houses that are overheating in summer as well as winter — in Chicago! These houses need to reject the heat, not collect the heat.”So where did the passive solar design principles come from? What’s changed since the 1970s?Today’s houses are better insulated and less leakyFor one thing, passive solar buildings never worked all that well. Even back in the 1970s, they were cold on winter mornings and hot on sunny afternoons. But most solar enthusiasts were so excited by the idea of “free heat” that we accepted uncomfortable conditions as a necessary part of the brave new solar future we were all busy creating.Second, today’s houses are better insulated and a lot more airtight than they used to be. That’s good, because they require less energy to heat and cool than homes built in the 1970s. However, recent improvements in insulation and air-sealing standards make homes with lots of south-facing glazing more susceptible to overheating — so it’s more important than ever to avoid excessive glazing area.It’s also essential that we make the right decision when choosing between high-solar-gain glazing and low-solar-gain glazing. That decision has gotten trickier lately, especially since Proskiw’s calculations have called into question the entire idea that south-facing windows are heat-collecting devices. Some designers (including Joe Lstiburek) have abandoned the idea of orientation-specific glazing specifications and now advise that all windows should have a low SHGC.Lstiburek says, “Don’t do it”In a 2014 article titled “Zeroing In,” Lstiburek addressed passive solar design principles with his usual bluntness.“Don’t bother with the passive solar,” Lstiburek wrote. “Your house will overheat in the winter. Yes, you heard that right. Even in Chicago. … You should go with very, very low SHGCs, around 0.2, in your glazing. If this sounds familiar to those of you who are as old as me, it should. We were here in the late 1970s when ‘mass and glass’ took on ‘superinsulated.’ Superinsulated won. And superinsulated won with lousy windows compared to what we have today. What are you folks thinking? Today’s ‘ultra-efficient’ crushes the old ‘superinsulated,’ and you want to collect solar energy? Leave that to the PV.”Why passive solar doesn’t work very wellFour salient facts undermine the old premises of passive solar design:In a well-designed house, the energy required for space heating represents a smaller percentage of a home’s energy budget than it did in the 1970s. In many low-energy homes, domestic hot water requires more energy than space heating. For more information on this concept, see It’s Not About Space Heating.While large expanses of south-facing glass help heat up a home on a sunny day, the solar heat gain doesn’t come when heat is needed. Most of the time, a passive solar home has either too much or too little solar heat gain, so much of the solar heat gain is wasted.At night and on cloudy days, large expanses of south-facing glass lose significantly more heat than an insulated wall.These days, investing in a photovoltaic array yields more useful energy than an investing in a south-facing window.A new look at the old principlesSo what kind of advice would I give a young designer contemplating the five passive solar principles listed at the beginning of this article?The long axis of the house should be oriented in an east-west direction. I still have a sentimental attachment to this principle, even though I know it won’t save any energy. The reason I like to follow this principle — at least when the site allows it to be followed — is that it allows more rooms to get sun during the day. If you live in a cold climate, winter sun is cheerful. [P.S.: In Comment #6 below, Dana Dorsett makes an important point: While the passive solar principle favoring east-west orientation may be hard to defend from a space heating perspective, most new homes should, if possible, include a roof that is optimized for the installation of a PV array. An east-west orientation makes this possible.]The rooms where people will spend most of their time should be located on the south side of the house, while utility rooms, bathrooms, closets, stairways, and hallways should be located on the north side of the house. It won’t save any energy, but this is still a good principle, for the same reasons that it makes sense to orient the long axis of a house in an east-west direction. However, if you live in a mixed climate or a hot climate where the sun is oppressive and shade is your friend, this principle can be ignored.There should be lots of extra glazing area on the south side of the house, and little or no glazing on the north side of the house. This principle is overstated. If your site has a wonderful view to the north, of course you want to include north-facing windows — and you may want your living room or dining room to face north. Moreover, there is no reason to include extra glazing on the south — only what’s necessary (in Proskiw’s words) “to meet the functional and aesthetic needs of the building.”That said, every house I have ever designed had more south glazing than north glazing — because sunshine is cheerful and I like sunny rooms. (Up to a point; watch out for glare. Many passive solar houses are so sunny on winter afternoons that the occupants all flee to the home’s dark northern corners.)The roof overhang on the south side of the house should be designed to shade the south windows during the summer solstice, but allow the sun to shine through the south windows on the winter solstice. Although there’s nothing wrong with this idea, it’s worth pointing out that it has always been impossible to design an overhang that will keep out the sun when it is unwanted and admit the sun when it is wanted. At best, the designer can come up with an overhang that kind-of, sort-of, almost works, but not quite. The sun is tricky. It follows the same path through the sky in March, when sun may be welcome, as it does in September, when it may be unwelcome. Moreover, at 10:00 a.m. and 2:00 p.m., it sneaks in sideways, at an angle, and stubbornly undermines the intent of the designer’s overhang.So it’s OK to shrug your shoulders and accept imperfection in this department — especially if you take Lstiburek’s advice and just jump on the low-SHGC bandwagon.The house should include extra interior thermal mass to soak up some of the solar heat gain that comes through windows on a sunny day. I’m happy to throw this principle out the window. However, if you live in a hot climate with high air conditioning bills, you may want to build a house with a lot of interior thermal mass. Just remember that many of the benefits of thermal mass can be achieved at a lower cost by installing extra insulation. GBA Prime subscribers can read a great many posted comments at the page where this article was originally published: Reassessing Passive Solar Design Principles. If you are a GBA Prime subscriber, that page remains the best place to post comments. Non-subscribers are invited to post comments below.P.S.: Readers interested in reading a 1978 research paper on this topic may want to check out this report by Rob Dumont: Passive Solar Heating. Our thanks to Bronwyn Barry for sharing this document.center_img GBA Prime subscribers have access to many articles that aren’t accessible to non-subscribers, including Martin Holladay’s weekly blog series, “Musings of an Energy Nerd.” To whet the appetite of non-subscribers, we occasionally offer non-subscribers access to a “GBA Prime Sneak Peek” article like this one.Everybody loves passive solar design. Back in the 1970s, “passive solar” was the essential first step for cold-climate builders. It was considered an approach with obvious advantages over complicated “active solar” schemes that required pumps, fans, and electronic controls.While the definition of a “passive solar house” was well established by the 1980s, Wolfgang Feist muddied the waters in the 1990s when he decided to call his new superinsulation guidelines “the Passivhaus standard.” Ever since that fateful day, journalists and owner/builders have confused passive solar design principles with Feist’s superinsulation standard from Germany.Rather than focusing on the confusion between passive solar design principles and the Passivhaus standard, however, I’d like to travel back in time to the 1970s, the heyday of the passive solar movement, to identify the original principles espoused by passive solar designers. Once these principles are identified, we’ll examine how many of them have stood the test of time.last_img read more

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Measuring Moisture in a Double-Stud Wall

first_imgOne of the key principles of high-performance, zero-energy homes is reducing energy use to a minimum. Since space heating and cooling have traditionally been the biggest residential end uses of energy, there is considerable emphasis on building insulation and air sealing. In most climates, it’s less expensive to increase wall insulation than it is to install a ground-source heat pump or more solar panels. For this reason, the walls of zero energy homes in heating-dominated climates usually require something thicker than 2×6 framing.This leads to the inevitable comparison of two high-R wall options. You could attach several inches of rigid insulation sheathing on the outside of the walls or build a thicker cavity using the double-stud approach. I compared those two approaches in a previous post called High-R Walls, Part 1: Wall Assembly. While exterior foam sheathing is widely accepted as a good way to prevent condensation in wall cavities, the moisture performance of the double-stud approach is rightly questioned because of the potential for condensation. Since this was such a big issue, I discussed it in a follow-up post called High-R Walls, Part 2: Moisture Content where I mentioned that I embedded a data logger in the wall cavity of my new home to test the moisture performance. Now it’s time to look at the results. The resultsThe highest RH measured at the exterior sheathing was 91%. Since condensation occurs at 100% RH, we can say that there isn’t liquid water on the sheathing. The graph shows a stretch of time with the highest RH levels over the two-winter test period (see Image #2, below).One interesting result is that the RH varies by 4 to 12 points over the course of any given day. The peak was generally at the coldest time of the night.This particular double-stud wall with fiberglass insulation didn’t experience condensation. If you looked up the temperature and water vapor amounts on a psychrometric chart or did a WUFI computer model, you would expect to see condensation. Why did condensation not occur in this case? While my test can’t provide conclusive evidence, there are several beneficial factors that reduce the condensation potential.Air sealing: The blower door test on this house showed 1.0 ach50. It’s not as tight as a passive house, but it’s tight. The primary air barrier is the exterior sheathing which is glued to the studs, plates, and subfloor. Drywall was glued to the interior face of the studs and plates (although I didn’t see this with my own eyes). I, myself, caulked the drywall to the subfloor and coated all the electrical boxes with a thick layer of duct mastic. Taken together, these measures allow almost zero air from the inside to migrate into the cavity.Why is air leakage a moisture issue? Because moist air carries much more water vapor into building cavities through air leaks than does diffusion through the wall materials themselves.Ventilation: Our house is equipped with a Lifebreath energy recovery ventilator (ERV). The humidity of air in the living space varies between 35% and 45%, a level low enough to protect the building. The ERV is balanced slightly negative. That means that slightly more air is exhausted than is supplied. The slight negative pressure means that most leakage through the building shell will be to the inside. This tends to prevent moist interior air from flowing into the structural cavities.Vapor retarder paint: The vapor retarder in this wall is a coat of poly-vinyl acetate primer with a perm rating of just under 1. Normally any water vapor that manages to squeeze into the wall through air leakage, diffusion, or other means has the opportunity to diffuse back through the drywall to the inside.Wood framing: For decay organisms to grow, wood must be at saturation, which is around 20% moisture content. So, wood framing, if installed dry, generally has a significant capacity to store moisture before becoming saturated. Framing will absorb moisture when RH is high in winter and release it when the RH drops during warmer, dryer months. This moisture storage capacity buffers the moisture level in the walls. This process is highly dependent on the local climate. Once fully cured, framing lumber around here has a moisture content of around 8%. (Moisture content of wood should not be confused with relative humidity of the air even though they are both expressed in percent.)Local climate: We live in a high desert climate with annual precipitation of only 8-11 inches. The climate itself is very forgiving. If wetting does occur, it will quickly dry out.The bottom line of this experiment was that under my specific conditions, double wall construction did not lead to a moisture problem. But given that this is backyard science with a sample of one, I won’t claim that it applies across the board. Nevertheless, I’m willing to speculate that the beneficial factors taken together allowed my wall cavity to avoid condensation conditions. And these same factors should be taken into consideration when designing wall assemblies in any climate. Here’s the setup. I used a HOBO UX100-023 Ext Temp/RH data logger to record the data from my own net-zero energy house. This data logger measures temperature and relative humidity (RH) using a probe on a 6-foot cable, allowing me to mount the probe inside a north-facing wall during construction. I placed the probe on the inside surface of the 5/8-inch OSB wall sheathing. This post originally appeared at the Zero Energy Project. RELATED ARTICLES How Risky Is Cold OSB Wall Sheathing?Monitoring Moisture Levels in Double-Stud WallsThe Return of the Vapor Diffusion BogeymanTwo Views of Double-Stud WallsExterior Rigid Foam on Double-Stud Walls Is a No-NoHow to Design a WallIs Cold Sheathing in Double-Wall Construction at Risk?Lstiburek’s Ideal Double-Stud Wall DesignGBA Encyclopedia: Double-Stud Walls BLOGS BY BRUCE SULLIVAN Banish ‘Payback’Making the Case for Prefab Zero-Energy HomesOn-Site Storage Is the Great Equalizer Simple Techniques for Lowering the Cost of Zero-Energy Homes Theory vs. measured resultsThe house has two stud walls: a structural wall on the outside and a second interior wall where the drywall is attached. Both walls are framed with 2x4s with an overall thickness of 10 inches. Packed with blow-in-blanket fiberglass, the insulating value of the assembly is around R-40.In theory, this is a recipe for condensation and all the problems that come with it. The OSB has a perm rating of about 0.7, so it qualifies as a vapor retarder. Thick insulation blocks heat flow from the inside making the sheathing very cold in winter. When humid indoor air seeps into the wall cavity, you would expect there to be a considerable amount of condensation. If condensation occurs it tends to collect on the sheathing, since it offers a large cold surface.I live in Bend, Oregon, which sits in Climate Zone 5 with about 6,800 heating degree days. I collected data over two winters. It’s not the arctic, but we do have our share of sub-freezing weather. The second winter saw an extended cold spell with many single-digit days in a row and several nights dipping below 0°F. This would seem to be a reasonable test of condensation in double-stud wall construction.last_img read more

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Farakka barrage a curse for Bihar, say experts

first_imgEchoing Bihar Chief Minister Nitish Kumar’s concern for the receding water flow in the Ganga and increasing silt deposit due to Farakka barrage causing floods in Bihar every year, experts on Sunday advocated “urgent review” and comprehensive study of the barrage to make the river rejuvenated.Magsaysay award winner Rajendra Singh, also known as Waterman, advocated removal of the Farakka barrage and said:“On the basis of what we have discussed so far, we can easily say that Farakka is inauspicious (ashubh) for Bihar. It is a curse (abhishap) which needs to be removed. Because unless and until we remove it, we cannot move forward.” Mr. Singh was addressing an international seminar, organised by Bihar’s Water Resources Department, on “Incessant Ganga” on the second day.“We have so far discussed so many aspects such as engineering and technological aspects of the Farakka, but there are other aspects such as environmental, cultural, natural, spiritual that need to be discussed,” he said.Speaking on the occasion, environment expert Himanshu Thakkar advocated urgent need for review of the Farakka barrage which, he claimed, had failed to fulfil any of the purpose — irrigation, hydro-electric power, water supply — of the barrage for which it was built.The barrage was built to maintain the navigability of the Kolkata port, he added.Mr. Thakkar, who is a coordinator of South Asia Network on Dams, River and People, New Delhi, said: “There is a need for urgent review of the barrage which is 42 years old. In the US, review of barrage is conducted in every 20 years, but in our country this practice is not followed.”last_img read more

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