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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.
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 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. 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.
WINTERIZING YOUR HOME? DON'T CAULK THE WINDOWS! The bigger leaks are in your crawl space or basement and in your attic. That is reason number 1 that caulking and weatherstripping aren’t going to help a whole lot. When you’ve got really big holes in the ceiling or floor, the gaps around the windows and doors pale in comparison. For example, there’s the bathtub hole in the floor, as WANT BAD AIR? PUT A HEATING & COOLING SYSTEM IN YOURSEE MORE ONENERGYVANGUARD.COM
WHERE WERE THE CONTROL FREAKS!? SUSPENDED CEILINGS ARE AIR No, the main building science crime is that they put this air-permeable insulation on top of an air-permeable ceiling. Air-permeable insulation can work fine if it’s completely encapsulated on 6 sides with materials that are air-impermeable. It can work OK sometimes when installed in ceilings and not encapsulatedon the top.
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 DOES YOUR SPRAY FOAM INSULATION NEED A THERMAL OR IGNITIONSEE MORE ONENERGYVANGUARD.COM
WILL OPEN-CELL SPRAY FOAM INSULATION REALLY ROT YOUR ROOF Murmurs and hearsay about open-cell spray foam insulation have been gaining traction for a while. It rots roofs, people have told me. Not long ago, someone even told me that in Florida, roofing companies won’t let their workers go up on roofs with open-cell spray foam because the roofs are so spongy, the guys fall right through. 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.
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 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. 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.
WINTERIZING YOUR HOME? DON'T CAULK THE WINDOWS! The bigger leaks are in your crawl space or basement and in your attic. That is reason number 1 that caulking and weatherstripping aren’t going to help a whole lot. When you’ve got really big holes in the ceiling or floor, the gaps around the windows and doors pale in comparison. For example, there’s the bathtub hole in the floor, as WANT BAD AIR? PUT A HEATING & COOLING SYSTEM IN YOURSEE MORE ONENERGYVANGUARD.COM
WHERE WERE THE CONTROL FREAKS!? SUSPENDED CEILINGS ARE AIR No, the main building science crime is that they put this air-permeable insulation on top of an air-permeable ceiling. Air-permeable insulation can work fine if it’s completely encapsulated on 6 sides with materials that are air-impermeable. It can work OK sometimes when installed in ceilings and not encapsulatedon the top.
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 DOES YOUR SPRAY FOAM INSULATION NEED A THERMAL OR IGNITIONSEE MORE ONENERGYVANGUARD.COM
WILL OPEN-CELL SPRAY FOAM INSULATION REALLY ROT YOUR ROOF Murmurs and hearsay about open-cell spray foam insulation have been gaining traction for a while. It rots roofs, people have told me. Not long ago, someone even told me that in Florida, roofing companies won’t let their workers go up on roofs with open-cell spray foam because the roofs are so spongy, the guys fall right through. HOME - ENERGY VANGUARD 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.
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. 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.
THE SCIENCE OF SAG
Sag – With joist-supported duct, they looked at natural sag and long-term sag. The difference between the two is that long-term sag represents and extreme case. Duct size – They used 6″, 8″, and 10″ diameter round ducts. The table above shows the amount of sag for the different compression percentages and duct sizes. 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 7 THINGS YOU MAY NOT KNOW ABOUT CEILING FANS A good fan will give you more than 100 cfm per watt; a poor one might be as low as 30 cfm per watt. Next time you’re looking for a ceiling fan, check the label. 4. Bigger is better with ceiling fans. While you’re checking those labels, you may notice a correlation. The fans with the longest blades have the highest efficacies and those with 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.
CAN YOU SAVE MONEY BY CLOSING HVAC VENTS IN UNUSED ROOMS A question I get asked frequently is whether or not it’s OK to close vents in unused rooms to save money. The answer may surprise you. The photo above shows a typical vent for an ducted HVAC system (air conditioner, heat pump, or furnace). On the return side, you’ll typically see plain grilles, but on the supply side, where theconditioned
IS COMPRESSED FIBERGLASS INSULATION REALLY SO BAD So, you don’t get the full R-value on the label, but the insulation still works perfectly well if all you’ve done is compress it. Here’s something you may not know. The standard R-19 fiberglass batt is 6.25″ thick. If you put that batt in a closed 2×6 wall, it will be compressed 0.75″ because a WILL SHADING YOUR AIR CONDITIONER SAVE YOU MONEY? In the Discussion section at the end of their report, the FSEC authors give the big reason why small scale shading like this doesn’t work. The temperature of the surrounding air has a much bigger effect on cooling efficiency than direct solar gain, and the volume of 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
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.) 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 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. DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? One of these products is a power factor correction device and can be seen here . This product claims: Residential customers throughout North America could see a realized savings of 8% – 10% typically and as much as 25% on their electrical usage MOISTURE AND THE QUIRKINESS OF OSB Moisture and the Quirkiness of OSB. Oriented strand board (OSB) gets blamed for a lot of problems that are really the fault of the designers and builders. Part of the problem, of course, is the perrenial confusion between correlation and causality. OSB hit the market as we really started getting serious about insulation and airsealing.
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.
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
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.) 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 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. DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? One of these products is a power factor correction device and can be seen here . This product claims: Residential customers throughout North America could see a realized savings of 8% – 10% typically and as much as 25% on their electrical usage MOISTURE AND THE QUIRKINESS OF OSB Moisture and the Quirkiness of OSB. Oriented strand board (OSB) gets blamed for a lot of problems that are really the fault of the designers and builders. Part of the problem, of course, is the perrenial confusion between correlation and causality. OSB hit the market as we really started getting serious about insulation and airsealing.
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. 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. 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.
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.
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.
DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? One of these products is a power factor correction device and can be seen here . This product claims: Residential customers throughout North America could see a realized savings of 8% – 10% typically and as much as 25% on their electrical usage 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. VAPOR RETARDER? VAPOR BARRIER? PERMS? WHAT THE HECK Class I: ≤ 0.1 perm (called impermeable) Class II: 0.1 to 1.0 perm (called semi-impermeable) Class III: 1.0 perm to 10 perms (called semi-permeable) The class I vapor retarders are also called vapor barriers because they pretty much stop the movement of water vapor. If the perm rating is greater than 10, it’s not considered a vaporretarder.
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 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 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 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.
DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? One of these products is a power factor correction device and can be seen here . This product claims: Residential customers throughout North America could see a realized savings of 8% – 10% typically and as much as 25% on their electrical usage 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 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.
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.) 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.
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 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.
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. 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 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.
DO POWER FACTOR CORRECTION DEVICES SAVE ENERGY? One of these products is a power factor correction device and can be seen here . This product claims: Residential customers throughout North America could see a realized savings of 8% – 10% typically and as much as 25% on their electrical usage 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 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.
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.) 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.
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 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.
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. 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.
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.
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. 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.
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 HOW MANY TONS OF AIR DOES YOUR HVAC SYSTEM MOVE? Density of air = 0.075 pounds per cubic foot. Now it’s easy to see the last step. Daily weight = (0.075 pounds per cubic foot) x (1,440,000 cubic feet per day) = 108,000 pounds per day. We have an easier unit to use when we get up to that many pounds, though. Let’s convert to tons: 108,000 pounds per day ÷ 2,000 pounds per ton = 54tons
WHY DO AIRTIGHT HOMES NEED MECHANICAL For now, we can summarize by saying that leaky homes need air-sealing. When they get tight enough, they need mechanical ventilation. Many homes fall into that grey area with the fuzzy borders somewhere in the middle between leaky and tight. More important, though, we need a better way of deciding when to install mechanical ventilation. 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. 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 4 PITFALLS OF SPRAY FOAM INSULATION Spray foam insulation is a great product. Homes insulated with it can be some of the most efficient and comfortable homes built. I’ve been in plenty of these homes and can tell you that a typical spray foam insulated house outperforms a typical fiberglass batt insulated house. Skip to main content* About
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THE LATEST FROM THE ENERGY VANGUARD BLOG A HOUSE NEEDS TO BREATHE...OR DOES IT? Posted by Allison Bailes on April 13, 2020 Have you ever lived in a home where you just couldn’t feel warm even though you had the heat...Read more
CAN YOUR HVAC SYSTEM FILTER OUT CORONAVIRUS? Posted by Allison Bailes on April 10, 2020 Yesterday I gathered with a few of my friends and colleagues from the building performance...Read more
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