Simple fan control - Page 2 - Electronic Circuits Projects Diagrams Free

joshua_33 · 6th July 2009, 06:08 PM

Quote:

Originally Posted by audioguru

Why blow around hot air with a fan?
Get an air conditioner instead.

It is often cold outside and hot inside the house.

audioguru · 6th July 2009, 06:24 PM

Quote:

Originally Posted by joshua_33

It is often cold outside and hot inside the house.

What is heating your house?
Maybe your house has poor insulation and heats in the daytime by the sun.
Maybe you need awnings over the windows on the sunny side.

Hero999 · 6th July 2009, 07:29 PM

Turn the heating off if it gets too hot in winter.

Where are you going to get 24V at 30A from? A 720W SMPs isn't going to be cheap.

BrownOut · 6th July 2009, 07:43 PM

I live in a thinly insulated house on Monte Sano mountain in northern Alabama. It was built back in the 1950's by the rocket engineering community that was so vital to the area at the time. Here, the temp routinely gets into the hight 90's in the Summer. The morning Sun heats my house from the exposed East, but in the afternoon, I can cool by drawing air from the shady side and moving it through the house with fans. It takes a little energy to run the fans, but waaaay less than the A/c would use. In the 8 years I've lived here, I've only run the A/C three or four days.

Hero999 · 6th July 2009, 08:41 PM

I don't know about where you live but here in the UK you can get government grants to help you insulate your home if you can't afford it. If you can afford it you might be able to save enouhgh money on your annual heating/cooling bill to pay for the insulation in a few years.

bailey45 · 7th July 2009, 04:58 PM

Back to the original question. Fan and power supply cheap and easy.

If you are going to use 12-24 volt fans i.e. the fan used in a PC I would recommend also using the power supply from an old PC. The power supply will have various outputs +5V, -5V, +12V, -12V anmd possible +3.3V. In various configurations you van have 5V, 10V, 12V, 17V and 24V which you can used for various speeds on your fan with the addition of a switch.

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6th July 2009, 07:29 PM	#18
Hero999	Turn the heating off if it gets too hot in winter. Where are you going to get 24V at 30A from? A 720W SMPs isn't going to be cheap. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

6th July 2009, 07:43 PM	#19
BrownOut	I live in a thinly insulated house on Monte Sano mountain in northern Alabama. It was built back in the 1950's by the rocket engineering community that was so vital to the area at the time. Here, the temp routinely gets into the hight 90's in the Summer. The morning Sun heats my house from the exposed East, but in the afternoon, I can cool by drawing air from the shady side and moving it through the house with fans. It takes a little energy to run the fans, but waaaay less than the A/c would use. In the 8 years I've lived here, I've only run the A/C three or four days. __________________ You don't need a quadraphonic Blaupunkt -- you need a curve ball.

6th July 2009, 08:41 PM	#20
Hero999	I don't know about where you live but here in the UK you can get government grants to help you insulate your home if you can't afford it. If you can afford it you might be able to save enouhgh money on your annual heating/cooling bill to pay for the insulation in a few years. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer. Last edited by Hero999; 6th July 2009 at 08:42 PM.

7th July 2009, 04:58 PM	#21
bailey45	Back to the original question. Fan and power supply cheap and easy. If you are going to use 12-24 volt fans i.e. the fan used in a PC I would recommend also using the power supply from an old PC. The power supply will have various outputs +5V, -5V, +12V, -12V anmd possible +3.3V. In various configurations you van have 5V, 10V, 12V, 17V and 24V which you can used for various speeds on your fan with the addition of a switch.