Monday, 11 January 2016

What are the benefits of radiant barriers in attics?

In hot climates, benefits of attic radiant barriers include both dollar savings and increased comfort.
Without a radiant barrier, your roof radiates solar-generated heat to the insulation below it. The insulation absorbs the heat and gradually transfers it to the material it touches, principally, the ceiling. This heat transfer makes your air conditioner run longer and consume more electricity.
An aluminum foil radiant barrier blocks 95 percent of the heat radiated down by the roof so it can't reach the insulation.
In summer, when your roof gets very hot, a radiant barrier cuts air-conditioning costs by blocking a sizable portion of the downward heat gain into the building. In the warm spring and fall, radiant barriers may save even more energy and cooling dollars by increasing your personal comfort. During these milder seasons, outdoor air temperatures are comfortable much of the time. Yet solar energy still heats up your roof, insulation, attic air, and ceiling to temperatures that can make you uncomfortably warm. An attic radiant barrier stops almost all of this downward heat transfer so that you can stay comfortable without air conditioning during mild weather.
You may also find that radiant barriers can expand the use of space in your home. For instance, uninsulated, unconditioned spaces such as garages, porches, and workrooms can be more comfortable with radiant barriers. Because radiant barriers keep attics cooler, the space is more usable for storage.
Roof-radiated heat also warms ductwork or mechanical equipment (air handler) in your attic. The proportion of the total heat gain the ductwork represents, compared to heat gain to the interior of the house, varies depending on the amount of attic and duct insulation you have.
How do radiant barriers "block" heat transfer?
Aluminum foil, the operative material in attic radiant barriers, has two physical properties of interest here. First, it reflects thermal radiation very well. Second, it emits (gives off) very little heat. In other words, aluminum is a good heat reflector and a bad heat radiator.
Your grandmother probably made use of these properties through "kitchen physics." She covered the Thanksgiving turkey with a loose "tent" of aluminum foil before she put it in the oven. The foil reflected the oven's thermal radiation, so the meat cooked as evenly on top as on the bottom. She removed the foil briefly to let the skin brown, but when she took the bird from the oven, she "tented" it with foil again. Since aluminum doesn't emit much heat, the turkey stayed hot until the rest of the meal was ready. To understand the concept of not emitting heat, let's use an analogy of a light bulb. When you turn on a light bulb, it emits light. If you paint the light bulb black, when it is turned on, there is no light emission. A radiant barrier has a similar effect on infrared heat. Your roof surface heats up in the sun and will emit infrared heat. When this infrared heat heats the radiant barrier it will not emit, or reradiate, the heat into your attic.

Cooking a turkey and painting light bulbs are simple analogies, but the same principles of physics apply to an attic radiant barriers. Aluminum foil across the attic airspace reflects heat radiated by the roof. Even if the radiant barrier material has only one aluminum foil side and that side faces down, it still stops downward heat transfer because the foil's low emissivity will not allow it to radiate the roof's heat to the insulation below it.

Sunday, 1 November 2015

What is Reflective Bubble Insulation?

Aerolam Insulations Reflective Insulation Provides Multiple Benefits
Aerolam Insulations products consist of single or double layers of Barrier Bubble material laminated between layers of metalized film to provide excellent thermal resistance. The bubble contains an air retention layer designed to provide increased strength and puncture resistance.
Insulation is used to either contain heat for maintaining warmth, or to resist heat for maintaining cold. In many applications, radiation is the dominant mode of heat transfer. Aerolam foil bubble is considerably more effective than conventional insulations in reducing radiant heat transfer.
Foil bubble reflects up to 95% of radiant energy in addition to resisting other types of heat transfer thus providing effective insulation.
High-Efficiency Performance
Thin, lightweight material provides resistance against the three types of heat flow: conduction, convection and radiation. It forms an effective barrier against moisture, air currents and vapors, while resisting fungus, insects and nesting rodents.
Easy to Use
It’s lightweight, compact and pliable yet resistant to punctures, tears and cracking. Conforms easily to fit complex shapes. Installation is quick and simple.
Cost-Effective and Versatile

An economical solution for a wide range of industrial, manufacturing and consumer applications.

What is Reflective Insulation

Thursday, 15 October 2015

Reflective Insulation and Radiant Barriers

Reflective insulation, is normally made of aluminum foil, it's also known as a radiant barrier and is very Flexible, Light-Weight and easy to Fit.
Everyone has seen reflective insulation without realising it. Paramedics use it as emergency blankets. Firefighters protect themselves from fires with reflective foil insulation. Companies such as NASA use reflective insulation on their shuttles, they protect astronauts with it aswell.
Reflective insulation, mainly blocks radiant heat from transferring through air gaps. Radiant barriers reflect and block excessive heat in the summer and retain heat through winter. Reflective insulation will also reflect the heat generated in your home back inside and block the heat from escaping. Meaning there is less heat escaping keeping your home warmer from less heating for longer. Resulting in lower fuel bills.
Radiant barriers are like all other types of insulation because they lower the amount of heat that enters or exits a home. Other types of insulation trap air inside the insulation, not allowing it to escape and consuming a lot of space. Reflective insulation works to decrease the flow of heat through an airspace using minimal space.
Reflective insulation does not absorb moisture. When used in conjunction with other insulation, it tends to keep the insulation drier and has a better overall performance. It can be used in homes, transportation, factories, greenhouses, summerhouses, barns, conservatories and Many More!
Benefits of Reflective Insulation
·         Light weight, very strong and easy to install
·         Moisture-proof - will not allow moisture to pass through in either direction
·         Eliminates condensation within the ceiling and walls when properly installed as a vapor barrier
·         Unaffected by humidity with lower moisture transfer and absorption rates than mass insulation - no mildew, mold or fungus growth
·         No significant mass to absorb and retain heat

·         No change thermal performance over time due to compaction, disintegration or moisture absorption - common concerns with mass insulation

Monday, 5 October 2015

Insulation - A Long-Term Power Saving Investment

Insulation, by definition, refers to a mechanism to shield an interior, by using material that prevents either heat loss or gain, or sound transmission. There are varied forms of insulation, such as fire insulation, electrical insulation or impact insulation, however, we would primarily be focusing on thermal insulation, since it plays a major role in raising our quality of lives, and helping us save on power-bills.
Modern day buildings and high-rises are a form of a miniature ecosystem unto themselves. Ideal temperature and humidity levels are maintained to keep the occupants comfortable, irrespective of what the weather outside is. Cities, with their traffic and other distractions can be pretty noisy too, and the interior of our buildings is also somewhat shielded from that noise. Insulation, is thus used to reduce unwanted heat loss or gain, and can decrease the energy demands of air-conditioning systems. Certain effective insulation materials in use are glass wool, cellulose, rock wool, polystyrene, per-liter, wood fiber, plant fiber, urethane foam, vermiculite etc.
Factors like a building's design, local climatic conditions, prevailing power tariffs, and the client's budget and requirements are taken into consideration before deciding upon what type of insulation to employ. Building codes pertaining to that region also play a role in the choice or type of building insulation used. Professionals like a qualified home energy auditor are consulted to analyze energy requirements, and decide upon the best insulation procedure. First and foremost, the 'thermal envelope' for the building has to be defined. A thermal envelope is the area in the building that needs to be insulated, wherein areas like the attic, and the basement are usually not included. The smaller the area to condition, the lesser the insulation costs and energy bills. It is imperative that proper planning for the layout of the insulation is done before the building work commences, since the retro - fitment of insulation requires parts of the building to be deconstructed to reach the inner layers for placement of the insulation material, which could be a major inconvenience to the occupants.

Often, as part of the insulation procedure, 'radiant barriers' are placed to reduce radiant heat transfer across an air space. Radiator insulation works in an effective manner by reflecting the heat, thereby not allowing it to get absorbed by the building. The downward heat flow is, thereby, also reduced, since the upward heat flow tends to be dominated by convection. The major component of building insulation is, however, the bulk insulators which block conductive heat transfer and convective flow, either into the building, or out of it.The bulk insulators are capable of resisting conductive heat transfer using the air spaces found in material like foam, fibers or plastic bubbles. Bulk insulators are particularly effective for air-conditioned buildings.