Introduction
Buildings of all kinds, from homes, factories to high rise, can by problems related to planning, construction and maintenance, which can be difficult to diagnose and resolve to be disturbed. The biggest problems in buildings include:
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Excessive energy consumption due to missing or damaged insulation, insulation, that the implementation is inadequate, and excessive air leakage through the thermal perimeter Moisture damage from leaks or condensation,especially in the walls or roofs Ice damage to sloped roofs Hvac distribution or poor performance Insufficient verification of construction details or structural delamination performance of façade materials "Sick building syndrome", mold and other health issues
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And their causes and consequences - - Often the problems can not simply be seen to have done after costly damage. Can be at this point the only way out extensive, costlyReconstruction. For example, a commercial building, a nursing home, had extensive problems with a poorly designed roof / ceiling insulation system to melt them contain excessive heat loss in winter and as a result of extensive ice damage by snow. Hundreds of thousands of dollars in various ill-conceived attempts to spend to correct the causes. At the end of the owners lived simply, with the additional problem because corrective actions were considered toexpensive. Despite this unfortunate resolution, helped the thermograms to negotiate a financial settlement with the owners, the architects and builders.
If used properly, allows thermal imaging camera owners, architects, contractors and building inspectors to verify performance to validate potential problem areas and corrective action solutions.
A great value of infrared thermography is that there is to do a means to see the invisible thermal signaturesMany of these problems in buildings. If used properly, thermography allows building owners, architects, contractors and inspectors to locate problems, verify building performance, and validate solutions. When people act on this information, buildings are significant savings and better! All surfaces radiate invisible heat energy. They have felt that energy emitted by the sun or a hot plate. Infrared cameras are electronic devices detect thermal specially developedRadiation. They convert this radiation into thermal images and thermograms, which visually represent temperature differences as small as 0.05 ° C. This portable, battery-powered devices detect the thermal data as either silent, or digital images on standard video tape or digital video. The image is displayed in a live viewfinder or an LCD view. Various radiant temperatures as different colors or shades of gray shown. Although it can sometimes be useful to displayTemperature values, this is often not required in the construction. Rather, the temperature differences are usually most interested. Under the right conditions, most buildings have characteristic thermal patterns that can be interpreted by a qualified person. The infrared systems themselves are quite easy to use and thus cause a number of thermographers building inspections. Finding the task of interpreting the images, understanding the causes of problems and solutions are all moredifficult. For this reason thermographers often work closely with a team of builders, architects and builders. The key to successful use of thermography to understand, which examines patterns of heat with the problems and know when will these patterns are linked visible in the infrared image.
Creating Applications for thermography
Thermography has been used since the mid-60s to solve building. During the late70s and early 80s, a time when fuel prices rose dramatically, was widely thermography as a tool to determine Building hugging performance. Since then, other applications have been developed and refined, especially the verification of structural performance based. The main building applications for the technology are listed below.
Insulation tests
Missing, damaged or non-performing insulation is clearly in a thermal image if it contains at least one10 ° C (18 ° F) temperature difference between the stable air conditioned room and the outside air. It is often possible, with less common due to the temperature differences in heat capacity of the building materials do. The test is usually carried out from inside and outside. Often the best results from the interior due to the reduced influence can be won, but a better overall understanding of the building can often be obtained from larger views of the outsideSurveys.
Missing, damaged or non-performing insulation is clearly in a thermal image if it contains at least 10 ° C (18 ° F) temperature difference between the stable air conditioned room and the outside air.
It is important that the type of insulation in the building and construction details, including how the insulation was installed white. Isolation may be present, but not offered on stage, often a destructive evaluation is to determineInitial conditions or understand the precise design detail. Any type of thermal insulation has a characteristic pattern. A soft foam insulation is prone to shrinkage and cracking in poorly installed. Many factors affect the image you are going to see. If the work is done during the day or early evening, the effects of solar loading are considered. The effects last 6-8 hours of sun light on both the inside and outside, after a wall was exposed. This often results in theDirection of heat flow is reversed, what pictures to confusion and misdiagnosis. Wind will also be expected, since they both can quickly eliminate the thermal difference to improve an area, as well as others. When buildings are wind-related problems, that "we are on cold windy days," then it is wise to consult with the testing of a wind load. The cost for the poor performance of the insulation are enormous. In addition to excessive energy consumption, it can be expensive freezing of water pipes or fireSprinkler systems; health issues with mold growth in cold places, damage to roofs and interiors by ice dams, condensation, and the intrusion caused by water.
Air Leakage Location
Excessive air leakage can be up to half of the energy systems of buildings account. Of course, adequate air exchange is for the residents' health and safety is important, but most buildings have a much higher air change rate is necessary. The cause is often poor design and / orConstruction to move the air across the thermal boundary. The problems can be as simple as a failed door weather seal, or as complex as an airway through a plumbing chase in an interior wall or ceiling plenum. The leakage path is often complex and not infrared, to visualize extremely difficult. Air leakage inspections are best performed when the air flow directed and controlled. This can be fans, blower door specialist, or be at greaterBuildings, through a temporary change to the HVAC system to a negative pressure inside. During the heating period, the resulting sites of air infiltration seem cooler. The work can any time of year are performed, as long as the indoor / outdoor temperature difference is greater than a few degrees. Blower Door fans can also be used to quantify air leakage rates. This technique is invaluable in predicting building performance and monitoring of air sealing work. Most types of insulation are not effectiveto reduce air movement through the thermal limit. Good construction practice includes indoor air sealing, if it does not exist effectively, can move air through the inner and outer surfaces and through the insulation. Unfortunately, fiberglass is particularly vulnerable to this problem. So while the insulation may be present, it is not working as expected when the building is under a pressure gradient. This will usually remain unnoticed until the fuel bill ispaid.
Ingress of moisture or condensation
As building designs and techniques close heat, produce moisture (leaks or condensation) has become more and more problems created. The water can penetrate through a tiny gap, but it is then trapped between the relatively dense materials. Good construction techniques usually need both air sealing and moisture retarder accumulate a lot of moisture within the wall sections to keep. Locating moisture withThermography is often easier, because water has both a high thermal conductivity and high heat capacity. The determination of the origin of the moisture can be difficult. Condensation, leakage, instead, is often the culprit so it is important that the sources of air leakage that can transport moist air into the wall sections and the cold spots, which condenses into their result can identify. The classic case is that the warm, moist air behind the insulation in a metal building or mobile home;as it contacts the cold underside of the metal roof it condenses and freezes often, so that inmates who think, wrongly, that the roof is leaking. Structural damage due to condensation include mildew, chipping bricks, roofing fastener corrosion and reduced insulation value.
Construction of thermal insulation composite systems (ETICS)
The growing popularity of buildings with EIFS was accompanied by numerous cases of moisture associated with structural damage.Although often attributed to leaky windows, water penetrates into the rule where sealing or flashing systems were inadequate have started or to fail. The moisture is then trapped under the relatively impervious foam. In warm climates the decay of wood structural elements that can be done very quickly, is a big problem. Mold growth often accompanies the moisture resulting in health concerns. Thermography is an invaluable tool to find moisture in EIFS. Inspections are best conducted in the earlyEvening from the outside to a sunny day with little or no wind. It may also be possible to find moisture from the interior during the cooling or heating conditions. The foam insulation boards tend to be more absorbent to water over time.
HVAC performance
HVAC systems can design and installation problems, which are plagued by excessive energy consumption and / or unpleasant building. Thermography helps building specialists visualize the otherwise invisible effects ofthis poor performance as by excessively hot or cold areas. Once these have been localized, the causes can be identified, these can be reversed or misdirected airflow or poorly placed supply channels, leading to short-circuit the air directly to the return channels. Unfortunately, many of these problems are a result of poor construction, by the time they thermographer identified, it is too late to correct. On the other hand, some problems (such as diffusers vice versa) is very simpleto correct. It is also possible to visualize the air flow itself! Several studies carried out by hanging thermographic layers plastic mesh in a room. As the air flows through them, the temperature of the network are mapped. In most comfort-related cases, it is probably wise to simply image the walls and objects in space, a technique that is much easier.
Subsurface heat sources
Heating coils are used more and more to keep out of either sidewalks orRemove snow from entrance ramps to provide heat or to land and premises to hot water or electrical cables. Thermography provides a quick way to check this site and service to underground equipment. Typically, the thermal pattern is very clear, even if the heat source is embedded in several inches of concrete. Similarly, water pipes are well localized in wall sections in the rule. Water drips from the pipe, whether in a wall section or under a blanket, can also be removed by means of infraredImaging (though in the air ultrasound may also be an effective method). To use infrared imaging techniques, a temperature difference can be induced in the control of hot water through the pipe. Note that leaks under concrete slabs can not express himself, because the discharged water in the sand / gravel base course and the effects are not visible from the surface may thermal. As a side note, thermographers are often asked to locate reinforcing steel in buildings. This is much more difficult.Heating the steel is no easy task, usually with an inductive coil or direct DC-powered heating. Second, the heat is often not sufficient to bring to the surface expression. Other methods for transmitting and receiving radio signals is based are probably more useful.
Verification of construction details
No area of application is important in these days, especially in commercial buildings, as the verification of construction details and performance. Thermographyis used with great success to bond beams and placement of reinforcement in concrete masonry unit (CMU) walls and structural elements of the pre-cast, tip-up walls to verify. How? The fixed parts of the walls change temperature more slowly than the others. The inspection at any time, the wall will be conducted in a thermally constant status - usually in the early evening when it cools. Since the inspection is performed during the construction phase, defects can be corrected beforethe crew with a relatively small inconvenience. Checking the placement of insulation in masonry unit walls is more important than in the past because of high energy costs and health concerns about mold formation in cold wall cavities.
Sick Building Syndrome
When buildings are too tight or too moist, health problems come quickly to the fore. Together as "sick building syndrome", this can stem from inadequate HVAC performance, moisture trapped in GroupedWalls, mold growth on cold, damp surfaces and inadequate air exchange rates. Many of them can be visualized and diagnosed, at least partially, with thermography to solve this very serious and common problems. The diagnosis of these problems is often a very complex process, and given the fact that litigation may be involved, it is not something to be entered easily.
Facade delaminations
Much of the work has done in Southeast Asia inspection of the facades of large buildingsfor delaminations. Losses from these materials can lead to serious injury. The brick walls are used to the building face tend to change temperature relatively quickly if they relate to the underlying structure to which they were affixed to start in comparison delaminate. The diurnal cycle is usually the driving heat source and inspections are the best in the early evening after a warm sunny day done.
Roof Moisture Inspections
The inspection of flat roofs, especially builtRoofing (BUR) has proven for a number of years. The technique allows the detection of moisture trapped in the roof system, over time this moisture leads to premature degradation of the roof. The humidity will be warmer at night after a sunny day because of its greater heat capacity. The roof surface must be dry and the technique works best on the roof with an absorbent insulation. Inspection work can be either in a survey roof or aerial photographs obtained from a survey conductedHelicopter or fixed wing aircraft and crafts.
Standards and References
Some important standards exist to work to support implementation of thermographers building inspections. These include among others the following:
ASTM C 1060-97 - Practice for Thermographic Inspection of Insulation Installations in Envelope cavities of Frame Buildings ASTM C-1153-1197 - Practice for the Location of Wet Insulation in Roofing Systems Using Infrared Imaging ISO 6781 - ThermalInsulation, qualitative detection of thermal irregularities in building envelopes, Infrared Method American Concrete Institute Design Standard 530 / American Society of Civil Engineers Standard 5, masonry building code and specification
Another good reference, though not a standard, the Canadian General Standards Board Manual for Thermographic Analysis of Building Enclosure (149-GP-2MP). Many buildings have been related papers published over the years, many arecollected on a CD-ROM from SPIE, entitled Selected Papers from the Proceedings of Thermal Sense, edited by John Snell and Doug Burleigh, available from the SPIE organization.
Completion
When used properly by trained personnel, the thermal imaging technology to play a strong role in visualizing otherwise invisible problems and building conditions. Contractors and architects alike, both with thermography, in order to guarantee the performance of their buildings. BuildingSpecialists to help include thermography, and diagnose difficult problems that remain unresolved expensive or dangerous. Owners rely on thermography as a tool for commissioning a new building. While a foundation of knowledge the successful use of thermography for building diagnostics are based on need, the entry with the most applications is often not difficult. A corresponding infrared system is required, with proper training and experience for the user as well. After additionalKnowledge of construction science or access to this information is also important. The primary return on an investment in building thermography gaining a higher degree of safety as intended and are building occupants more comfortable, often at a lower price.
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