domingo, 30 de septiembre de 2007

Refrigeracion con Celulas Peltier

Refrigeracion con Celulas Peltier (TEC Cooler)


Las células Peltier son otro de los métodos de enfriamiento usados para hacer overclock extremo. Su uso no esta muy extendido dado que la relación coste/rendimiento no es de las mejores teniendo en cuenta las soluciones alternativas que hay, asi que no voy a alargar mucho la entrada.

Estas células se basan en el efecto Peltier descubierto por Jean Peltier, y que a grandes rasgos se basa en interconectar metales parecidos (tipo p y tipo n) entre sí a través de la unión Peltier.

Definicion: Consiste en la creación de una diferencia térmica a partir de una diferencia de potencial eléctrico. Ocurre cuando una corriente pasa a través de dos metales similares que están conectados entre sí en dos uniones (uniones Peltier). La corriente conduce una transferencia de calor desde una unión hasta la otra. Una unión se enfría mientras que la otra se calienta. El efecto es utilizado para refrigeración termoeléctrica.

A efectos prácticos lo que se consigue es que una cara de la célula esté muy caliente y la otra esté muy fría, la cual será la que acoplaremos al procesador para darle un extra de frío.

Ahora vienen los contras. Las células Peltier decentes, las que montaríamos en nuestros ordenadores, disipan entre 100 y 150 W (superándolo en muchos casos), ya que tienen un consumo de energía altísimo (entre 5 y 15A, llegando hasta los 20A). Ésto implica que tener el microprocesador a una temperatura aproximadamente de 30 - 40 ºC por debajo de la temperatura ambiente, pero a la vez tener una cara caliente que nos esta disipando el mismo o incluso más calor que la misma CPU, con lo cual hemos de acompañar la célula con un disipador u otros métodos de enfriamiento que he enseñado en entradas anteriores.

Eso sí, si no nos importa el consumo y tenemos una buena solución para enfriar la célula, podemos tener un equipo funcionando 24 horas al día a una temperatura en la mayoría de casos bajo cero.

AMD ha patentado la utilización de células peltier para la refrigeración de microprocesadores, según la patente Nº 6.800.933 de la oficina de patentes de los U.S.A.

La peltier como método para refrigerar micros con tecnología de 0.065micras se podría conectar a 12v. Pero parece ser que aún es pronto ya que faltan cosas por esclarecer como el precio que costaría tener este sistema.

Espero les haya sido útil, un saludo muy grande para GeeKtacora por el articulo, Patagonian.



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