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Overheating from South Windows

first_imgThese are part of the solar shading plan. The idea is to install the louvers in spring and keep them around until fall, and then take them off and stash them for the winter. These louvers will prevent high-angle light from making it through the window in the summer and heating the interior space. By installing them on the outside, we minimize heat gain inside — hopefully most of the heat that is generated when sunlight is absorbed by these shades will re-radiate into the outside air, rather than heating the inside of the house. Andrea and I recently started sleeping in the house, so some things that I’ve been noticing about the heating profile of the house are starting to become clear.When we finally got the HRV running a few weeks ago, I was disappointed to notice that we don’t have the kind of evenness of temperature between the upper and lower stories of the house that we were hoping for. My first panicked theory about this was that the HRV wasn’t working. Panicked, because the ducts are all nice and snug behind walls now, so if we got it wrong, it’s going to be a real pain to fix.The good news is that I don’t think the problem is the HRV, although I’m contemplating one tweak to the vent layout which we could do without any wall surgery. A recent updateIn August 2014, Ted Lemon wrote the following update on the overheating issue.Over the past two years, we’ve learned that there isn’t a problem with overheating in spring. As summer approaches, before it gets really hot, night flushing is completely adequate to keep the house comfortable.As the summer progresses, the sun gets high enough that there is minimal solar gain. Not none, but minimal. This turns out to be beneficial, because summers in Vermont are humid, but not much hotter than our preferred indoor temperature. With a little solar gain through the windows, we wind up running the heat pump in air conditioning mode enough to bring down the humidity; without the solar gain it would get too cold.There is a bit of an issue with overheating in late summer, when the sun is lower but it’s still warm out. Louvers might help a bit with that, but I think we’re talking about somewhere between two weeks and a month, and as the weather gets crisper, night flushing should start to be effective again.We were having trouble with overheating upstairs last summer, and I started to use a box fan laid flat to push cold air up and basically stir and mix the air in the house. This turned out to be quite effective. So partway through the summer we had Bill Congleton install a Haiku fan in the atrium. This draws about 35 watts on full blast, and we don’t generally run it on full blast because it isn’t necessary and creates too much of a breeze. Once we had the fan in, we haven’t had any problems with temperature gradients — it’s about the same temperature upstairs as down. The fan’s very pretty, too. RELATED ARTICLES Passivhaus Buildings Don’t Heat ThemselvesAll About Glazing OptionsHigh-Solar-Gain Glazing Study Shows That Expensive Windows Yield Meager Energy Returns We specified high-solar-gain glazingWe’re experiencing some overheating. Why is Peter seeing different results? I don’t know, but I have a theory. I think the windows in the houses in Charlotte may not have the same solar heat gain coefficient as ours, and may reflect more high-incidence light, while letting low-incidence light in, so that they gain more heat in the winter than they do in the summer, even if the same amount of light is hitting them. The way our house is set up, we have a heat pump indoor unit on the wall downstairs, right in the center of the house. We have nothing upstairs. So the reason I was worried that the HRV wasn’t working is that one possible interpretation of the data is that we’re cooling the house adequately, but the HRV isn’t doing its job in redistributing the heat evenly throughout the house. If that’s the case, it’s kind of a big problem.But having just spent the morning sitting down next to the windows with the heat pump off, I have a different theory. For most of the morning, it was nice and cool downstairs, but as more sun came in and the day went on, it started to get hot, just as it is upstairs in the afternoon. In other words, the heat coming in from the windows is heating the upstairs and downstairs evenly; the reason that it feels hotter upstairs is because the cooling effect of the heat pump completely counteracts the heating effect of the windows. I’ve confirmed this by turning the heat pump back on.So this gives me some real confidence that when we get around to building and installing the louvers, we will stop experiencing overheating in the south part of the house. I’m still a little tempted to add one more ventilation supply vent (fresh air grille) on the south side of the house upstairs, but that’s something I’m hoping to have a chance to debate with the guys at Zehnder. If it needs to be done, it’s a really easy fix, because I can do it up in the utility loft, which doesn’t have a finished floor.center_img Our original plan included exterior louversWhen we talked with Peter Schneider (one of the two energy consultants on our project) about the possibility of overheating, he reported his experience with some of the houses that Efficiency Vermont has designed up in Charlotte, Vermont. These all have lots of south-facing windows, and Peter hasn’t seen problems with overheating in the summer. Based on Peter’s reports, we were kind of hoping to get away without doing one of the features we’ve got on the plan: active shading on the south-facing windows.If you look at the drawing of the house shown below, which is a view of the south face, you’ll see that the lower windows have what looks like louvers on them. Low indoor humidity during the winterThe bad news is that we’re having problems with low indoor humidity during the winter. We’d originally imagined that because we were sealing the house so tightly, we’d have indoor humidity issues, but that was based on an incorrect understanding of the reason why houses get humid: lack of air exchanges. With the HRV running at 30% or 60% of capacity most of the winter, we were seeing humidity getting down into the 20-30% range, which was uncomfortable.This is the one big failing of the fancy HVAC arrangement so far. It’s actually quite hard to counteract because there are so many point sources of air and so many exhaust ducts that there’s no good place to install a humidifier where it will affect the whole house other than inline with the HRV.We talked with Zehnder about this, but they have had bad experiences with whole-house humidifiers causing condensation in the ducts when customers have installed them, so they strongly recommend against the installation of a humidifier.I think it would be possible to have a very tightly controlled humidification system coupled with an HRV that wouldn’t cause condensation because it would be sensitive to the inner temperature of the house and the humidity of the input air, but that appears to be a product waiting on someone to decide to make it.We can get the humidity up a bit by drying clothes indoors, but we don’t do enough laundry for this to be a complete solution to the problem. So this is our little bit of remaining future work; I have a few ideas, but nothing concrete enough to talk about yet. For the past two years, Ted Lemon and Andrea Lemon have been living in a single-family Passivhaus which they built in Brattleboro, Vermont. Ted Lemon wrote the essay below in July 2012. Ted Lemon lives in Brattleboro, Vermont. He is a computer programmer and network expert who works for Nominum Inc. and is on the administrative/editorial board of the Internet Engineering Task Force. Ted and Andrea Lemon write the Vermont Passive House blog (formerly known as the “Almost Passive House” blog).last_img read more

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Meet Me at the Table: Family Mealtimes and the Holidays

first_imgDuring the holidays, schedules are chaotic, with kids being out for school holiday breaks and parents being home from work. These factors can make family mealtimes stressful because they are different from the family’s regularly scheduled routine.Added stress of relatives coming into town for the holidays or having to travel to relatives houses to spend the holidays with them can leave families with not a whole lot of time to stick to their mealtime routines.The stress of having to cook a big family meal can be overwhelming. Focusing on the “why” of fixing the meal over the “how” can put things in perspective.Routines really do have an great impact on family mealtimes and can stress parents and kids out when those routines  are off balanced. Try to mirror holiday mealtimes as closely to normal routines as possible, but still highlighting the importance of the season.Positive mealtimes lead to kids eating more healthier foods!Parental emotions are super important during family mealtimes; positive emotions lead to healthier relationships within the family.Involving kids in meal preparation (grocery shopping, meal planning, and cooking) can lead to a more positive experience for the whole family and can be teaching opportunities on healthy choices and step by step cooking instructions.Involving kids in the process gives them a say in food choices and their own unique preferences; they tend to have healthier diets and stronger preferences for fruits and vegetables.These skills translate once kids grow up and they tend to continue these healthy habits into adulthood.The importance of mealtimes is being together as a family and enjoying each other’s company.These insights on family mealtimes and more come from the Family Resiliency Center at the University of Illinois. They have several podcast episodes available, including one entitled ” Holiday Chaos in the Kitchen: Ease Tension, Improve Health, Enjoy the Holiday.”The Family Resiliency Center also has a series of public service announcements called “Mealtime Minutes.” These videos cover various topics including balancing work and life stress, positive communication at the dinner table, and limiting the effects of excessive screen time and media. Click here to view these helpful videos.If you joined us for our collaborative webinar on The Power of Family Mealtimes in August 2018, then you know just how powerful dining together can be in relation to health and wellbeing. If you missed this webinar, you can view the archived version here.ReferencesMonahan, R., Saltzman, J. & Melcalfe, J.  (2017). Holiday Chaos in The Kitchen: Ease Tension, Improve Health, Enjoy the Holiday. Family Resiliency Center Podcast. Retrieved from:  https://soundcloud.com/user-346411005/holiday-chaos-in-the-kitchen-ease-tension-improve-health-enjoy-the-holidayThis blog was written by members of the MFLN Family Development Team. The Family Development team aims to support the development of professionals working with military families. Find out more about the Military Families Learning Network Family Development team on our website, Facebook, and Twitter. By: Jason M. Jowers, Bari SobelsonPixabay[Christmas Dinner Table by vivienviv0 on December 25, 2014, CC0]The holidays are a busy time filled with obligations galore- including family and food! Why not make the best out of this holiday season by combining the two and reap the many benefits of family mealtimes? You’re probably thinking that this is a lot easier said than done with all of the other items on your “plate” including shopping, office parties, and everything else holiday related. But, it may be easier than you think! Here are some important things to remember about family mealtimes and suggestions from various resources on how to make mealtimes work during the busiest time of the year!last_img read more

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Absence of Negative Isn’t Proof Of Positive

first_imgAbsence of negative isn’t the same as the presence of positive.The fact that you aren’t negative, pessimistic, and cynical doesn’t indicate that you are positive, optimistic, and empowered. Your attitude can lie somewhere on this continuum between the two poles, even though we know that optimism is a far healthier choice.An absence of illness is not proof of good health. Even though you may not be sick, you may not be healthy, just like not being poor isn’t proof you are wealthy. There is some state between an absence of illness and an absence of well-being where most people live.Because your dream client is engaged with you in a sales conversation that is following your sales process and your assumptions about client journeys without expressing any real concern isn’t an indication that there are not risks to the opportunity. The absence of a threat isn’t proof a threat does not exist, nor does it prove you are succeeding in winning your dream client’s business.A client who is not unhappy isn’t necessarily pleased and satisfied. The lack of complaints or concerns is not evidence that they are over the moon with you, your service, or your relationship. One key stakeholder being thrilled is not proof that their peers are not horribly unhappy.When there isn’t evidence of something negative, it’s easy to mistakenly believe something is positive. The absence of one is not proof of the other, and if you want to know where things stand, the best strategy is to ask for confirmation.Is there something negative that you can’t see because you haven’t explored or asked for confirmation, being afraid of a confirmation that something isn’t quite right? Is there something positive you aren’t tracking because you fear asking the question might change someone’s perception? In either case, you eliminate your ability to improve your circumstances unless you uncover the evidence. Get the Free eBook! Learn how to sell without a sales manager. Download my free eBook! You need to make sales. You need help now. We’ve got you covered. This eBook will help you Seize Your Sales Destiny, with or without a manager. Download Nowlast_img read more

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Metro to JLN Stadium rolls out, Phase-II almost complete

first_imgFile photo of Delhi Metro.A crucial link to the main Commonwealth Games venue of Jawaharlal Nehru Stadium, the Central Secretariat-Sarita Vihar corridor today rolled out to the public just hours before the inauguration of the sporting extravaganza.The 15-km corridor, which will facilitate the travel of people attending the opening ceremony of the Games, was inaugurated without much fanfare, though DMRC Managing Director E Sreedharan was present at the Central Secretariat station.A brand-new Standard Gauge train began its journey from the Central Secretariat station at 8 am after it was flagged off by the Station Master in the presence of Sreedharan.The line is part of the Central Secretariat-Badarpur corridor, whose deadline was September 30. But, the DMRC decided to throw it open till Sarita Vihar only as some signalling work is pending on the small stretch from Sarita Vihar to Badarpur.With this, the Delhi Metro’s ambitious Phase-II has almost been completed except the Airport Express Line, which could not get the safety clearance.”It is a matter of great pride and glory for all of us in Delhi Metro that the Badarpur line has been substantially opened up to Sarita Vihar. This marks almost the completion of our Phase-II project,” an elated Sreedharan told reporters at the Jawaharlal Nehru Stadium.He recalled that the line was sanctioned only in 2007 and it has been completed within just three years and four months.Since the line connects the JLN Stadium, Delhi Metro will runs 29 trains on it till the end of the Games at an all- time high frequency 2.40 minutes.advertisementDMRC spokesperson Anuj Dayal said that Sreedharan himself will monitor train movement on the line on Sunday from the Operation Control Centre at Metro Bhawan.”Since it is the opening ceremony, he will be there at the OCC the whole day and monitor the train movement. Senior officials and experts from South Korea and Germany have also been stationed at various places to ensure no technical glitch takes place today,” he said.This is the second Standard Gauge line to come up in the country after the Delhi Metro’s Inderlok-Mundka corridor.Work on the line was delayed after an under-construction pillar collapsed in Zamrudpur in south Delhi last July killing seven people.Immediately after the line opened, a number of people, especially Games volunteers, took the Metro to reach the Games venue.The JLN Stadium station wore a festive look and Sreedharan visited it along with his wife and senior DMRC officials.At the Central Secretariat station, Sreedharan and other officials took part in a ‘havan’ before taking a ride on the train.The line is expected to be further extended up to Badarpur from Sarita Vihar in about 10 days time.With its inauguration, the total operational Metro network expands to 153 kilometres with 130 Metro Stations and the travel time from Central Secretariat to Sarita Vihar will be approximately 26 minutes.Central Secretariat has now become one of the biggest interchange Metro stations with both Standard and Broad gauge lines merging in the national capital.last_img read more