Temporary IE

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Here are temporarily some various data, links, notes etc.

Picture of connecting relay made orgininally at Noisebridge 2010

Heating and cooling unit 13/6/2012 OK we are going to play with the relay circuit switching on and off peltier (100 w) and fans (120 mm "PSU") by arduino. I wonder if 250 W power source from PC power supply unit would be suitable? I can get it for free ... I want to use at least one 120 mm axial-flow type. I wonder what how I can find more about the static pressure

  • A fan with high static pressure is more effective at forcing air through restricted spaces, such as the gaps between a radiator or heatsink; static pressure is more important than airflow in CFM when choosing a fan for use with a heatsink. The relative importance of static pressure depends on the degree to which the airflow is restricted by geometry; static pressure becomes more important as the spacing between heatsink fins decreases. Static pressure is usually stated in either mm Hg or mm H2O.

because in our case we have a heat sink with fins just behind the ventilator. The idea in this moment is to connect two peltiers to one heat sink one peltier on each side. When we need to cool, one with the "cold side" to heat sink is switch in + the fan in the internal duct and the external fan cooling the external heatsink by the hot side of the peltier. When we need to heat up the second peltier with the hot side connected to the heat sink is switched on so is the internal fan and if necessary external fan cooling the heat sink on the external cold side of the peltier. In this case there would be just one heat sink in the internal circulation connected on one side to the hot side of the peltier module and on the other side to the cold side of peltier module.

So to play with this we need:

  • bigger hardware

- 250 W PSU source - 2x peltier - heat past - 2-4x 120-80 mm fans - ventilation duct

  • arduino/circuit

- arduino - relay - diode - transistor - 10 k resistor