Lack of reliable operational methods makes it difficult for potential users to benefit from infrared survey systems which are already well tested technically. In order to develop operational routines for the use of thermography for building and district heating network applications, airborne, mobile and handheld infrared systems have been tested in two different investigation areas. Provided that perturbing factors were taken into consideration and surveys were made during stable weather conditions, with low windspeed, the infrared system tested was found to have good accuracy and low operational cost. An aircraft equipped with an infrared line scanner (8 -14 pm) seems to be the best system for surveying larger areas, while helicopter and mobile thermovision systems (8 -14 pm), are preferable for smaller investigation areas. The best way to analyze thermograms seems to be with an interactive computer -based image analysis systems.
One of the tools traditionally used in assessments of the thermal status of buildings is the application of JR-techniques. This application has to a large extent been restricted to indoor inspections of attics, external walls and basements, or to roof inspections by means of aerial thermography, or to detection of air leaks by pressurisation of the building. These applications have, in general, been very successful.In this paper is presented an evaluation of a staged process where major building envelope anomalies have been detected by outdoor thermography, classified using indoor thermography, moisture meters and fiber optics techniques, and evaluated with regard to their impact on energy consumption and envelope performance.In the evaluation of this process, inspections of external walls using indoor thermography and vehicleborne outdoor thermography have been compared to one another regarding factors such as the number of suspected thermal anomalies detected, the accuracy in predicting real damages, the time required for the operation and the image analysis, factors limiting operational efficiency, and the ease of the operation. Also, the measured external surface temperatures have been compared to those predicted by an analytical calculation.It is concluded that vehicle-borne JR-inspections may provide a quick way of detecting building thermal anomalies. The prediction accuracy relative to indoor inspections to some extent depends on the building design. However, most major damages detected by indoor thermography can, under suitable operating conditions, be detected also from the outside. Thus, a process combining outdoor thermography to detect building anomalies and indoor thermography to survey selected details, in a cost-efficient way gives a rather complete picture of building damages and building thermal status.To make an efficient use of the thermographic data collected, the information should be stored in a data base containing also other data on the building, for example, data on building function,design and operation. The whole process of gathering data by IR-techniques should be integrated into already existing schemes for building management, operation and maintenance. INTRODUCTIONBuildings require continous control and maintenance. The service life of buildings may vary from 20 to 100 years depending on buildingfunction and design and on maintenance frequency. Cheap energy and lack of reliable, operational methOds has led to a reduction in the frequency and extent of maintenance. In some cases, the maintenance of buildings has never had a high priority due to lacking interest or lack of economic resourses. However, neglect of control and maintenance of buildings sooner or later leads to severe building damages, increasing energy cost and deteriorating building performance. 92 / SPIE Vol 1313 Thermosense XII (1990) Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
A successful production of plants in a greenhouse requires a microclimate adapted to the needs of each specific type of plant produced. Ambient temperature and humidity are two important parameters. This paper describes preliminary results from a field study using infrared thermography to map the temperature distribution pattern of tables for plant production, gas heated infrared radiation tubes, and of plants at different stages of growth. Comparative studies are performed for one gas-IR heated greenhouse and one reference greenhouse with a conventional water based heating system. Preliminary results indicate that infrared thermography is an efficient way to detect temperature anomalies of the heating systems and of the heat distribution systems of a greenhouse. Thermography could also be used as a tool when calibrating and evaluating the function of greenhouse heating systems, and to indicate anomalies in the growth process of the plants.
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