Design and verification of thermostat with peltier thermoelectric modules
In the paper we deal with design, modeling and verification of thermostat with particularly thermally insulated chamber, based on Peltier thermoelectric modules (elements). A prototype of the designed thermostat has been realized. Parameters of the regulated system were obtained experimentally. We have developed the reliable model of the complete thermostat with the PSD regulation in the Matlab environment, as well. The model helps to optimize the parameters of the regulator according to desired temperature profiles inside the chamber. Measurements show a good agreement between the model and realized prototype of the thermostat.
Prototipo Generador de Agua con Celdas de Peltier
Con el fin de contribuir con una solucion a la problematica de la escases de agua se realizo el estudio de tecnologias que utilizaran celdas de Peltier para condensar las particulas de agua suspendidas en el aire y otras aplicaciones para posteriormente disenar un sistema prototipo generador de agua basado en esta tecnologia y como valor agregado la implementacion de un sistema de alimentacion fotovoltaico para la alimentacion del sistema.
A microcomputer-compensated crystal oscillator using a dual-mode resonator
The system described uses microcomputer-controlled compensation wherein the correction is implemented by adding a computed offset frequency to the output of a stable oscillator. Temperature sensing is done by the use of a dual-mode oscillator system using two C-modes of an SC-cut crystal, which are combined to produce a temperature-sensitive difference frequency. System accuracies of +or-20 p.p.b. have been achieved over a temperature range of -55 degrees C to +85 degrees C.<<ETX>>