OAKLAND – For one of the few times over the past week, Kevin Durant seemed to be at peace.Durant said he does not harbor the same anger he had after last week’s blowup with Draymond Green. He apologized directly to this reporter for snapping at a question about his relationship with Green after he unleashed a string of vulgarities and addressed his pending free agency next summer. He understands why the NBA was compelled to fine him $25,000 for “directing inappropriate language toward a fan” …
But hey, at least you can see it there. A more insidious form of accidental dehumidification happens inside building cavities. In the winter time, the air inside your home is more humid than the outdoor air.The condensing surfaces are — or should be — closer to outdoors. If you’ve got good double-pane windows and insulation in your home, the colder parts of the building are on the exterior side.Accidental dehumidification in wallsSo let’s say water vapor from indoors gets into a wall cavity. Let’s say that wall cavity is filled with insulation that doesn’t stop air movement, like fiberglass, cellulose, or mineral wool. That’s how most walls are insulated, after all.What happens when the water vapor gets through to the exterior side of that wall cavity? Unless the house has insulation on the outside of the sheathing, that sheathing (plywood or OSB usually) is going to be cold when it’s cold outdoors. It’s likely to be a condensing surface.If enough water vapor gets into the wall cavity, you can have some serious accidental dehumidification going there. That can result in rot and mold and indoor air quality problems. Not a good thing! It’s also in a hidden place, so you won’t see it like you do on the window.Preventing accidental dehumidificationThe physics makes it pretty clear what to do, right? Here are your options:Keep the air dry enough that it can’t find any condensing surfaces. Even if it gets into the wall cavity, the sheathing will be above the dew point if the air is really dry.Keep the indoor air at a decent humidity level but make sure that water vapor doesn’t get into the wall cavity. That mostly means making the interior side of the wall airtight, although there are situations where you might also need a vapor retarder to limit outward diffusion.Keep the exterior sheathing warmer by installing insulation on the exterior side.In short, you can reduce the amount of water vapor, you can keep the water vapor separated from the condensing surfaces, or you can eliminate condensing surfaces with exterior insulation. Which approach you choose to do depends on your situation, but the first option is usually the least preferable. You don’t want the indoor air to be too dry.I’ve been discussing accidental dehumidification in winter time here, but it happens in summer, too. The duct photo (see Image #2, below) shows condensation dripping from the bottom of a duct on a hot, muggy day in South Carolina. The wall photo (see Image #3, below) shows mold on the drywall inside a wall cavity, which happens when humid outdoor air finds its way to the condensing surface created by air conditioning the building. Whether it happens in winter or summer, though, accidental dehumidification generally isn’t a good thing.Thanks to Terry Brennan, James Cummings, and Joseph Lstiburek for suggesting the term “accidental dehumidification.” I was reading an article of theirs titled Unplanned Airflows and Moisture Problems on the plane the other day and that was one of the things they discussed. Allison Bailes of Decatur, Georgia, is a speaker, writer, energy consultant, RESNET-certified trainer, and the author of the Energy Vanguard Blog. Check out his in-depth course, Mastering Building Science at Heatspring Learning Institute, and follow him on Twitter at @EnergyVanguard. RELATED ARTICLESFundamentals of Psychrometrics, Part 1Fundamentals of Psychrometrics, Part 2Fundamentals of Psychrometrics, Part 3How to Use the Psychrometric ChartRating Windows for Condensation ResistanceAre Dew-Point Calculations Really Necessary?Q&A: Why do I have condensation on my windows? “Oops! The house just had an accident. Whose turn is it to clean it up?”Yep. We’re entering the season of accidental dehumidification. If you’ve got windows that start collecting water, like the one shown here, you’re a victim of accidental dehumidification. It’s not something you want in a building.Water vapor and condensing surfacesHere’s a quick lesson on accidental dehumidification.Air is a mixture of dry air and water vapor. (See my introduction to psychrometrics for more.)The dew point is the temperature at which the water vapor component of that air will start to condense, or go from the vapor to the liquid phase.Condensing surfaces, materials that are at or below the dew point, are where the action occurs. That window above is a condensing surface.Accidental dehumidification is happening on that window above because the glass and metal are colder than the dew point. If that happens occasionally, it’s not such a big deal. But if that window stays wet long enough, it can start rotting the wood around the window and growing mold.
Matt Asay Top Reasons to Go With Managed WordPress Hosting Related Posts Serverless Backups: Viable Data Protection for … Cloud Hosting for WordPress: Why Everyone is Mo… OpenStack has been around since 2010, but it wasn’t until 2012 that the open-source cloud computing project really took off. Since Rackspace established the OpenStack Foundation in September 2012, the project has exploded to over 1,000 code authors, and is now one of the world’s largest open-source communities, arguably even bigger than the Linux community. Given how central open source has become to software development, generally, it’s worth analyzing why OpenStack has taken off.It’s The Foundation, StupidWhile OpenStack always offered great promise, it wasn’t until Rackspace let go of the wheel that the project really exploded. This isn’t to suggest that Rackspace’s stewardship was somehow bad, but rather that moving to a foundation made the project more inviting.While Rackspace used to dominate code commits, now Red Hat is OpenStack’s biggest committer, with IBM quickly moving in on the second spot. Credit: BitergiaThis is pretty amazing. Just a year ago Rackspace was in control. Now it’s just one of the community. A key member of the OpenStack community, to be sure, but it’s a testament to the vitality of the OpenStack community that Rackspace is no longer the top code committer.A Common EnemyEqually impressive is how fast the number of code authors has increased, now at 1,031 at the time of publication. Part of this might be due to the foundation governance model, but a number of open-source projects – MySQL, JBoss and others come to mind – have been exceptionally succeessful with one primary developer.Hence, while moving to a foundation certainly helped, OpenStack’s success comes down to a range of different factors.Among them is simply need. As The Register‘s Jack Clark somewhat humorously highlights, “OpenStack is big because Amazon has terrified everyone into contributing code.” Or as Mat Keep, director of MySQL Product Management and Marketing at Oracle, puts it, vendors felt like they could only compete with Amazon as a cohesive unit. Importantly, Rackspace didn’t directly compete with the IBMs and Red Hats of the world, as Inktank vice president Neil Levine suggested to me over IM, and hence “companies felt less awkward about participating.” He concludes:“It’s easier to join a project where the authors have different business models to you (as a software business).”These are important motivations, sure, but there’s more to the OpenStack story. After all, if a common enemy and orthogonal business models were enough, we would have seen OpenOffice mount a serious challenge to Microsoft Office years ago, given its backing by Sun and then Oracle, among other industry titans.Making Contributing EasyNo matter the motivation to contribute and collaborate, the best open-source projects make it easy to do so. As Andy Grimm, an operations support engineer for Red Hat’s OpenShift, highlights, OpenStack chose both the most developer-friendly license (Apache v2) and a highly approachable programming language (Python), significantly lowering the legal and technical bars to participating.Couple that with a super-simple setup (“it just works (startup in 2 lines of code)”, as MongoDB community manager Francesca Krihely suggests and a modular architecture, echoing Rishidot Research principal analyst Krishnan Subramanian, and you have all the right elements for break-out success.Market Timing And More Than A Hint Of LuckIn sum, it’s hard to assign full credit to any particular element of OpenStack’s make-up in its runaway community success. More likely OpenStack has boomed due because it sits at the nexus of several key components of successful open-source communities. Some of this stems from market timing and luck, but much of its success also derives from laying essential infrastructure for open-source success (license, language, modularity, etc.).Back in 2006 I laid out the essential elements for architecting a successful open-source project. Among these were market timing, the right license, how applicable the code was to pressing business problems, code modularity and more. While other projects have attempted to pull these together, few can claim to have done so with as much precision, or success, as OpenStack.Which is why it now has 9,685 members standing behind the project. That’s real community. How Intelligent Data Addresses the Chasm in Cloud Tags:#cloud#community#IBM#Open Source#OpenStack#Rackspace#Red Hat
zoomOdfjell Terminals Jiangyin. Image Courtesy: Odfjell Norwegian shipping and tank terminal company Odfjell SE has finalized the sale of its stake in Odfjell Terminals Jiangyin (OTJ), China.The indirect 55% equity interest in OTJ has been sold by Odfjell Terminals Asia Holding to Yangzijiang Shipbuilding (Holdings) for a price of about USD 46 million.The transaction will result in a capital gain expected to be booked in Q3, and net proceeds to Odfjell estimated at USD 21 million, the company said.In May 2018, Odfjell revealed that American private equity firm Lindsay Goldberg (LG) was considering the sale of its 49% shareholding in Odfjell Terminals BV. After LG completed the sales of its shareholdings in the US and European terminals, LG is now in the process of selling its shareholding in the Asian terminals.Connected with this, Odfjell has decided to tag along on LG’s sale of its indirect shareholding in OTJ.Commenting on the transaction, Kristian Mørch, CEO of Odfjell, said:“We are pleased to have concluded the sale of our Jiangyin terminal and its jetty at what we believe is a fair valuation that is a testimony to the strength and quality of the investments made since 2007.”“This divestment is in line with our strategy to grow and focus on chemical terminals in locations where we can harvest synergies with Odfjell Tankers.”With a total storage capacity of 99,800 cbm and 22 tanks, OTJ has eight berths for coasters, barges or deep-sea tankers of up to 50,000 dwt. It is located in the Jiangyin Economic Development Zone on the south bank of the Yangtze River, approximately 150 km west of Shanghai and 12 hours sailing by ship from the entrance to the important Yangtze River.Related:Odfjell Finalizes Sale of Rotterdam Tank TerminalOdfjell Terminals Sells Its Singapore Terminal