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HVAC DESIGN PROTOCOLS However, Energy Vanguard is focused on work primarily in the United States and North America. For many reasons, including availble equiment, duct fittings, regional practices and the metric system we cannot practically offer service worldwide. Energy Vanguard can help you with a complete HVAC design. Fill in the form above right to findout more.
POWER ATTIC VENTILATORS BANNED BY NEW GEORGIA ENERGY CODE Builders can install them. They just can’t give them any electricity from the power company. Here’s what it says in the Georgia State Supplements and Amendments to the International Energy Conservation Code (2009 Edition): 403.10 Power attic ventilators. In new construction, power attic ventilators shall not be connected to theelectric grid.
THE DIMINISHING RETURNS OF ADDING MORE INSULATION The equation to calculate heat flow over a heating season is Q = U x A x HDD x 24. The result is the total number of BTUs of heat that flow through the wall under those conditions. The only thing that varies in the graph below is the R-value. U = 1/R. A = 1000 square feet. HDD =4400.
PERHAPS THE WORST HVAC DUCT IDEA EVER Panned joist return ducts are almost always terribly leaky. Those junctions between wood and metal are difficult to seal, and the thermal expansion and contraction of the wood will often cause sealing materials to fail. Occasionally, I see panned returns where the HVAC company actually tried to seal it up. The photos below show one that Iran
HVAC DESIGN DONE RIGHT Many people even know about Manual D, which describes how to design the duct system. Not so many, however, know about the missing links – Manual S and Manual T. If you want a properly designed HVAC system, you have to go through the whole process in all four protocols: J, S, T, and D. (It’s easy to remember the order.HEATING OR COOLING
The truth, however, is that we spend more on heating than on cooling, sometimes a lot more. The pie chart below shows the energy costs for an old, mostly uninsulated house with a low-efficiency furnace. (These data come from energy modeling in a home energy rating. I don’t have the actual energy bills for this home.) HOW TO DETERMINE THE SIZE OF YOUR CENTRAL AIR CONDITIONER Then find the lable that gives the data about your AC. It’ll look like the image below. Up near the top of the label, you see the model number (M/N) and serial number (S/N). The model number is where you can find the number you’re looking for. Not all manufacturers do this, but most will give you a 2 or 3 digit section that tells you how KEEP OUT! - ONE PLACE NEVER TO PUT HVAC SYSTEM DUCTS The insulation should provide the clue you need. Those ducts are going through a vaulted ceiling, and, just as a vaulted ceiling is a terrible place to put recessed can lights, it’s also perhaps the worst place you can put a duct for your HVAC system. Not only does the duct displace insulation, it’s also right up against the roof deck. HOW MUCH SHOULD YOU WORRY ABOUT ASBESTOS IN THE HOME Asbestosis is an inflammation leading to shortness of breath, coughing, and other breathing problems. Mesothelioma is a cancer of the protective membrane around the lungs. Lung cancer is well known because so many people succumb to it each year, mostly from smoking. THE #1 REASON POWER ATTIC VENTILATORS DON'T HELP Three years ago I wrote an article titled, Don’t Let Your Attic Suck – Power Attic Ventilators Are a Bad Idea.Nearly a hundred thousand page views and 93 comments later, it’s still generating lots of heat. I don’t know why so many people are so defensive about power attic ventilators, but here are a few of the things they’ve said tome in the comments:
HVAC DESIGN PROTOCOLS However, Energy Vanguard is focused on work primarily in the United States and North America. For many reasons, including availble equiment, duct fittings, regional practices and the metric system we cannot practically offer service worldwide. Energy Vanguard can help you with a complete HVAC design. Fill in the form above right to findout more.
POWER ATTIC VENTILATORS BANNED BY NEW GEORGIA ENERGY CODE Builders can install them. They just can’t give them any electricity from the power company. Here’s what it says in the Georgia State Supplements and Amendments to the International Energy Conservation Code (2009 Edition): 403.10 Power attic ventilators. In new construction, power attic ventilators shall not be connected to theelectric grid.
THE DIMINISHING RETURNS OF ADDING MORE INSULATION The equation to calculate heat flow over a heating season is Q = U x A x HDD x 24. The result is the total number of BTUs of heat that flow through the wall under those conditions. The only thing that varies in the graph below is the R-value. U = 1/R. A = 1000 square feet. HDD =4400.
PERHAPS THE WORST HVAC DUCT IDEA EVER Panned joist return ducts are almost always terribly leaky. Those junctions between wood and metal are difficult to seal, and the thermal expansion and contraction of the wood will often cause sealing materials to fail. Occasionally, I see panned returns where the HVAC company actually tried to seal it up. The photos below show one that Iran
HVAC DESIGN DONE RIGHT Many people even know about Manual D, which describes how to design the duct system. Not so many, however, know about the missing links – Manual S and Manual T. If you want a properly designed HVAC system, you have to go through the whole process in all four protocols: J, S, T, and D. (It’s easy to remember the order.HEATING OR COOLING
The truth, however, is that we spend more on heating than on cooling, sometimes a lot more. The pie chart below shows the energy costs for an old, mostly uninsulated house with a low-efficiency furnace. (These data come from energy modeling in a home energy rating. I don’t have the actual energy bills for this home.) HOW TO DETERMINE THE SIZE OF YOUR CENTRAL AIR CONDITIONER Then find the lable that gives the data about your AC. It’ll look like the image below. Up near the top of the label, you see the model number (M/N) and serial number (S/N). The model number is where you can find the number you’re looking for. Not all manufacturers do this, but most will give you a 2 or 3 digit section that tells you how KEEP OUT! - ONE PLACE NEVER TO PUT HVAC SYSTEM DUCTS The insulation should provide the clue you need. Those ducts are going through a vaulted ceiling, and, just as a vaulted ceiling is a terrible place to put recessed can lights, it’s also perhaps the worst place you can put a duct for your HVAC system. Not only does the duct displace insulation, it’s also right up against the roof deck. HOW MUCH SHOULD YOU WORRY ABOUT ASBESTOS IN THE HOME Asbestosis is an inflammation leading to shortness of breath, coughing, and other breathing problems. Mesothelioma is a cancer of the protective membrane around the lungs. Lung cancer is well known because so many people succumb to it each year, mostly from smoking. HVAC DESIGN PROTOCOLS However, Energy Vanguard is focused on work primarily in the United States and North America. For many reasons, including availble equiment, duct fittings, regional practices and the metric system we cannot practically offer service worldwide. Energy Vanguard can help you with a complete HVAC design. Fill in the form above right to findout more.
7 WAYS TO IMPROVE DUCTS IN AN UNCONDITIONED ATTIC A lot of people have gotten the message that ducts for your HVAC system—and the system itself—should be in conditioned space. Researchers at the National Renewable Energy Lab (NREL) studied the effect of ducts in an unconditioned attic and found they add 25% to the cooling load in hot climates. In their study, the NREL team assumed the ducts were sealed well. WHAT IS THE BEST WAY TO DEAL WITH CRAWL SPACE AIR Putting a little bit of supply air from the HVAC system into the crawl space. Using an exhaust fan to move air from the crawl space to outside. Installing a dehumidifier. Let’s take a look at each of these methods. 1. Vent the crawl space to the outside. Do this in a humid climate, and you’re asking for trouble. IN OR OUT? WHERE DOES THE PAPER FACING OF BATT INSULATION The upshot here is that If you put the kraft paper on the wrong side and it gets wet, it won’t trap moisture. The wetter it gets, the better it dries. If you put it on the right side, where the humidity is, it’s not much of a vapor retarder. Also on the graph is the permeance of polyethylene. As Dr. Joe says in the article, “ Plastic A HEATING LOAD RULE OF THUMB THAT WORKED John Mills developed the 2-20-200 rule for heating loads in 19th century buildings. Click the image to read about him on HeatingHelp.com. Add those three numbers together, and that gives you the Equivalent Direct Radiation (EDR) in square feet. WHY AN OVERSIZED AIR CONDITIONER IS A BAD IDEA When an air conditioner is oversized, it starts up and shuts down a lot more because it runs for only a short time to meet the thermostat setpoint. Then a few minutes later, it comes on again and runs for a short time. Over the course of a day, an oversized air conditioner can have a lot more start-ups and shut-downs than a properly sized air DUCTS IN AN UNCONDITIONED ATTIC INSTALLED TOO HIGH Subscribe to the Energy Vanguard Blog and Newsletter. Your source of knowledge about the world of building science, home energy efficiency, green jobs and more. AIR HANDLER IN AN UNCONDITIONED ATTIC INSTALLED VERTICALLY Subscribe to the Energy Vanguard Blog and Newsletter. Your source of knowledge about the world of building science, home energy efficiency, green jobs and more. FLEX DUCTS IN AN UNCONDITIONED ATTIC INSTALLED AS LOW AS Flex ducts in an unconditioned attic installed as low as possible FLEX DUCT CRUSHED BY PEOPLE CRAWLING OVER IT Subscribe to the Energy Vanguard Blog and Newsletter. Your source of knowledge about the world of building science, home energy efficiency, green jobs and more. HOME - ENERGY VANGUARDABOUTKNOWLEDGENEWSROOMCONTACTBOOK DR.BAILESENERGY STAR
Allison was hired to design and teach a training class to introduce our employees to HERS ratings and general building science. He took a difficult and complex subject and condensed it into an enlightening and entertaining two hour class that made quite an impression on ourstaff.
POWER ATTIC VENTILATORS BANNED BY NEW GEORGIA ENERGY CODE A couple of months ago, I wrote about why you don’t want power attic ventilators in your home.Whenever I’ve written about this topic, it just seems to set some people off. I get comments like, “You really should do more research before you post blogs like this,” and, “ You don’t know what you are talking about!” My favorite, I think, was, “ You need to go get some more degrees DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? Today we’re running a guest post by Chris Kaiser of Mapawatt.com. I met Chris recently because we’re both blogging from the great city of Atlanta, and our blogs complement each other well. Here at Energy Vanguard, we focus mainly on THE #1 REASON POWER ATTIC VENTILATORS DON'T HELP Three years ago I wrote an article titled, Don’t Let Your Attic Suck – Power Attic Ventilators Are a Bad Idea.Nearly a hundred thousand page views and 93 comments later, it’s still generating lots of heat. I don’t know why so many people are so defensive about power attic ventilators, but here are a few of the things they’ve said tome in the comments:
THE DIMINISHING RETURNS OF ADDING MORE INSULATION The key is to figure out how much it’s going to cost you to get those savings. Going from R-11 to R-13 just involves using a different insulation, but going from R-13 to R-15 (the whole-wall R-value for 2×6 walls) requires going from 2×4 to 2×6 walls and thus more insulation, more lumber, and doors and windows with wider jambs. THE UNINTENDED CONSEQUENCES OF HIGH-MERV FILTERS But you’re in luck. As it turns out, the PM2.5 particles can be filtered out of the air with the right type of filter. After my article on indoor air pollutants, I wrote about filters and even included a nice chart from my friend John Semmelhack. It shows the percent of different size particles trapped by filters with differentMERV ratings.
HEATING OR COOLING
Yes, it’s definitely better, but these homeowners will stay pay about twice as much for heating as they do for cooling. (Notice also that in a high performance home the lights and appliances become the dominant part of the energy costs because the building envelope and HVAC equipment are so much more efficient. HOW MUCH SHOULD YOU WORRY ABOUT ASBESTOS IN THE HOME Asbestos was a popular material for most of the twentieth century, mainly because of its ability to insulate and act as a fire retardant. In fact, it’s still used heavily in HOW TO DETERMINE THE SIZE OF YOUR CENTRAL AIR CONDITIONER Allison – nice topic, which Allison – nice topic, which as you know leads to others. First the SEER 13 designation. The prefix designation applies to the whole family (series) of air conditioners from a 1.5 ton unit up to a 5 ton unit. WHAT'S THE NAME OF THE OUTDOOR PART OF A HEAT PUMP Finally, there’s a dehumidifier model that’s a split system. The Ultra-Aire SD12, unlike other dehumidifiers, dumps its waste heat outdoors.(Disclosure: Therma-Stor, which makes the SD12, is an advertiser here.) The outdoor unit of a split-system dehumidifier is always a condensing unit because that’s where you’re dumping theheat.
HOME - ENERGY VANGUARDABOUTKNOWLEDGENEWSROOMCONTACTBOOK DR.BAILESENERGY STAR
Allison was hired to design and teach a training class to introduce our employees to HERS ratings and general building science. He took a difficult and complex subject and condensed it into an enlightening and entertaining two hour class that made quite an impression on ourstaff.
POWER ATTIC VENTILATORS BANNED BY NEW GEORGIA ENERGY CODE A couple of months ago, I wrote about why you don’t want power attic ventilators in your home.Whenever I’ve written about this topic, it just seems to set some people off. I get comments like, “You really should do more research before you post blogs like this,” and, “ You don’t know what you are talking about!” My favorite, I think, was, “ You need to go get some more degrees DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? Today we’re running a guest post by Chris Kaiser of Mapawatt.com. I met Chris recently because we’re both blogging from the great city of Atlanta, and our blogs complement each other well. Here at Energy Vanguard, we focus mainly on THE #1 REASON POWER ATTIC VENTILATORS DON'T HELP Three years ago I wrote an article titled, Don’t Let Your Attic Suck – Power Attic Ventilators Are a Bad Idea.Nearly a hundred thousand page views and 93 comments later, it’s still generating lots of heat. I don’t know why so many people are so defensive about power attic ventilators, but here are a few of the things they’ve said tome in the comments:
THE DIMINISHING RETURNS OF ADDING MORE INSULATION The key is to figure out how much it’s going to cost you to get those savings. Going from R-11 to R-13 just involves using a different insulation, but going from R-13 to R-15 (the whole-wall R-value for 2×6 walls) requires going from 2×4 to 2×6 walls and thus more insulation, more lumber, and doors and windows with wider jambs. THE UNINTENDED CONSEQUENCES OF HIGH-MERV FILTERS But you’re in luck. As it turns out, the PM2.5 particles can be filtered out of the air with the right type of filter. After my article on indoor air pollutants, I wrote about filters and even included a nice chart from my friend John Semmelhack. It shows the percent of different size particles trapped by filters with differentMERV ratings.
HEATING OR COOLING
Yes, it’s definitely better, but these homeowners will stay pay about twice as much for heating as they do for cooling. (Notice also that in a high performance home the lights and appliances become the dominant part of the energy costs because the building envelope and HVAC equipment are so much more efficient. HOW MUCH SHOULD YOU WORRY ABOUT ASBESTOS IN THE HOME Asbestos was a popular material for most of the twentieth century, mainly because of its ability to insulate and act as a fire retardant. In fact, it’s still used heavily in HOW TO DETERMINE THE SIZE OF YOUR CENTRAL AIR CONDITIONER Allison – nice topic, which Allison – nice topic, which as you know leads to others. First the SEER 13 designation. The prefix designation applies to the whole family (series) of air conditioners from a 1.5 ton unit up to a 5 ton unit. WHAT'S THE NAME OF THE OUTDOOR PART OF A HEAT PUMP Finally, there’s a dehumidifier model that’s a split system. The Ultra-Aire SD12, unlike other dehumidifiers, dumps its waste heat outdoors.(Disclosure: Therma-Stor, which makes the SD12, is an advertiser here.) The outdoor unit of a split-system dehumidifier is always a condensing unit because that’s where you’re dumping theheat.
A HEATING LOAD RULE OF THUMB THAT WORKED Sizing a heating or cooling system should start with an assessment of the heating or cooling load.. Nowadays, we know the physics behind heat transfer, so we can come up with fairly accurate predictions of how much heating and cooling a building will need even before it’sbuilt.
MANY NEW HOMES HAVE COMPLEX BUILDING ENCLOSURES Many new homes have complex building enclosures. The many corners, windows, and roof-wall intersections add framing and reduce thewhole-wall R-value.
WHAT IS THE BEST WAY TO DEAL WITH CRAWL SPACE AIR In this method, you use a standalone dehumidifier for the crawl space. (Again, we’re talking about encapsulated crawl spaces only; although some people try, you can’t dehumidify the whole outdoors.)It’s controlled by the conditions in the crawl space, not the house above, so it this method will do the best job of keeping the crawl space dry. HVAC DESIGN PROTOCOLS HVAC design is more than ACCA Manual J. Most HVAC contractors, home energy raters, contractors and others in the residential construction field know about Manual J. HOW TO DETERMINE THE SIZE OF YOUR CENTRAL AIR CONDITIONER Allison – nice topic, which Allison – nice topic, which as you know leads to others. First the SEER 13 designation. The prefix designation applies to the whole family (series) of air conditioners from a 1.5 ton unit up to a 5 ton unit. THE BASIC PRINCIPLES OF DUCT DESIGN, PART 1 When it comes to heating and cooling homes, forced air distribution is king. Yeah, my Canadian friend Robert Bean of Healthy Heating pushes radiant for both heating and cooling, and my Texas friend Kristof Irwin drank that koolaid and installed what may be the first radiant cooling system in Texas.Even if radiant distribution systems completely take over, though, we’ll still need forced air HOW MUCH SHOULD YOU WORRY ABOUT ASBESTOS IN THE HOME Asbestos was a popular material for most of the twentieth century, mainly because of its ability to insulate and act as a fire retardant. In fact, it’s still used heavily in some parts of the world, such asIndia and China.
HOW MANY TONS OF AIR DOES YOUR HVAC SYSTEM MOVE? Glad to hear the tornado. Glad to hear the tornado missed you, Roy. That kind of air movement gives a whole new meaning to weight of air. At the beginning of the article, I mentioned work and energy but didn’t explore that topic further after the calculation. BUSTING A MYTH ABOUT LOW-STATIC DUCTED MINI-SPLITS I like mini-split heat pumps, especially of the ducted variety. And because I don’t like to pay for a lot of excess power, I prefer to use ducted mini-splits with smaller blower motors operating at a low total external static pressure. IN OR OUT? WHERE DOES THE PAPER FACING OF BATT INSULATION If you install fiberglass batt insulation* with a kraft paper vapor retarder in a home, which way do you face the vapor retarder? To the inside of the home or the outside of the home? For many buildingscience questions,
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THE LATEST FROM THE ENERGY VANGUARD BLOG THE #1 REASON TO HAVE AN ALL-ELECTRIC HOME Posted by Allison Bailes on October 2, 2019 Maybe you've heard the rumblings coming out of the environmental and building science crowd. Maybe...Read more
THE THIRD WORST PLACE TO PUT A DUCT Posted by Allison Bailes on August 14, 2019 Ah, so many choices. If you want to design and install a duct system to create problems, the...Read more
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