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Temperature sensing based on optical transmission in a LiBr heat pump

Published online by Cambridge University Press:  01 February 2011

Miguel Basurto-Pensado ,
Rosenberg J. Romero ,
Jesús Escobedo-Alatorre ,
Margarita Tecpoyotl-Torres ,
Aurelio H. Jiménez-Heredia  and
Javier Sanchez-Mondragon
Miguel Basurto-Pensado
Affiliation:
mbasurto@uaem.mx, Universidad Autónoma del Estado de Morelos, Av. Universidad # 1001 col. Chamilpa, Cuernavaca, Morelos, Mécxico, Mexico, 777 3297084, 7773297984
Rosenberg J. Romero
Affiliation:
rosenberg@uaem.mx, Universidad Autónoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas,, Mexico
Jesús Escobedo-Alatorre
Affiliation:
jescobedo@uaem.mx, Universidad Autónoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Mexico
Margarita Tecpoyotl-Torres
Affiliation:
mago_torres03@yahoo.com.mx, Universidad Autónoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas,, Mexico
Aurelio H. Jiménez-Heredia
Affiliation:
aheredia@susu.inaoep.mx, Universidad Popular Autónoma del Estado de Puebla, Depto. de Física,, Mexico
Javier Sanchez-Mondragon
Affiliation:
jsanchez@inaoep.mx, Universidad Autónoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Mexico
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Abstract

A new technique, based on Optical Methods, has been tested for the evaluation of the lithium bromide (LiBr) concentration, a corrosive substance frequently used in heat pumps. Those solutions have large oxidizing capabilities. This technique avoids the direct contact between the electrodes and the LiBr aqueous solution within a thermodynamic absorption cycle. The viability of this technique in a potential commercial device, resides on its capability to detect working fluid concentrations within a temperature range from 25 °C up to 70 °C, those limiting temperature values correspond to the operating wavelengths of 1.33 μm and 1.55 μm, respectively. Our system determines the correlation among the signal and temperature data, for various concentrations, between 49 and 58 mass percentages. This function of two variables is represented as a surface with the transmittance, concentration and temperature as parameters and wavelength as reference. We discuss the adequate parameters characterization used in this technique.

Keywords

optical propertiessensorchemical composition
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 888: Symposium V – Materials and Devices for Smart Systems II , 2005 , 0888-V03-17
Copyright
Copyright © Materials Research Society 2006

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References

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