Abstract
The practical use of the exhaust heat has a great potential in saving energy. Uprating the absorption refrigerator is one of the options. For the optimum equipment design, two or three-dimensional thermometry is important. Laser induced fluorescence (LIF) is often used to measure the temperature of water. In the absorber of absorption refrigerator, the water amount varies momently. The change of dye concentration affects the LIF signal, therefore, there are few techniques to measure temperature applicable to absorption refrigerator. In this study, authors propose a new technique that combines the LIF and particle tracking velocimetry (PTV). We developed a new hollow microcapsule tracer by doping temperature sensitive fluorescent dye. This method does not need to dissolve the fluorescent dye to the working fluid and quantitative measurement would be possible regardless of the change of concentration. Results showed that the functional particles of this study have a high sensitivity.
