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greatest possiblethermal resolution, in most systems, the sensorconsistsof a singleinfra-reddetector(suchas In this paper, several automotive climate control mercury/oadmlum/telluride). Electromechanicalservos applications for IR thermographyare described. Some of (galvanometers)oscillate mirrors to perform horizontal these applicationscan be performed usingconventional and verticalscanningof the image ontothe detector.The IR techniques. Others, such as visualizing the air detector respondsto the sum of the emitted, reflected, temperature distributionwithin the cabin, at duct exits, and transmitted energies (radiosity) coming from the and at heater and evaporator faces, require new target. experimental methods.In order to capture the 1"oobtainthe targettemperature,the emittedenergy temperaturedistribution withinan airstream, a O.25-mm-must be separatedfrom the total radiosity. The emitted thick (0.01 inch) fiberglass screen is used. This screen energy must be compensated(scaled up) by the target can be positionedperpendicularor parallelto the flow to emittanceto obtain an equivalentblackbodyemittance. obtainthree-dimensional spatialmeasurements. In many Finally, this blackbody emittance is converted to a cases, the air flow pattern can be inferred from the temperatureby referenceto Planckblackbodydistribution resultingtemperature distribution, allowingimprovedair information. In this way, an IR imaging system can distribution designs. In all cases,significantimprovement captureand process108temperature measurementsper in the speed, ease, and quantity of temperature second. These signalsare digitizedby a microprocessor distribution informationcan be realizedwiththermography and converted to grey-scale or color video images. A as compared to conventional thermocouple array high-resolutionvideo recorder can be used to store techniques. Comparisons are presented between IR transient images for later post-processing. Typical thermography images and both thermocouple personal computer or workstation post-processing measurementsand computational fluid dynamics(CFD) capabilitiesinclude identificationof isotherms,minimum predictions, and maximumtemperatures,and temperatures along a particularline,curve, or boundary. As a real-time interactive diagnostic tool, IR

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The technical community has questioned the validity and cost-:effectiveness of open cycle ocean thermal energy conversion (OC-OTEC) systems because of the unknown effect of noncondensable gas on heat exchanger performance and the power needed to • 10. D. L. Block, et al., Therm oeconomic optimization of OC-OTEC electricity and water production plants. Report FSEC-CR-108-84 and TM-977, Florida Solar Energy Center and Creare R&D, Inc. (1984).

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