Setup (say via comparator) the thresholds for the temp
Have the output connected (via amp) to the fan so when the upper limit is reached the fan turns off, when the lower limit is reach the fan turns on
Keeping the "temp" within this band
How to do it digitally...
Well not to sure although you could probably use a 74HC14 schmitt ability for the hystersist with enough input conditionally
I am not proposing that you overkill this thing but you need to understand that "constant" is a relative term and with a basic proportional control your room temperature will still fluctuate as your fan speeds up/slows down and as the load in the space changes. The fluctuations may be small enough that it achieves your goal of "constant."
its true sir, the fan is for the person rather people who enter the room, if a person enter the room, the room temparature will vary so the the circuit (temperature regulator) will automatically on, and regulate the room temperature.
no sir, i want to set a constant or rather a range of temparature. like i said to sir audiogure, this circuit will automatically on in its detect that the temp changed.
OOps. I didn't notice the country.
I bet its pretty cold about 5,000m above the ground over there.[/quote]
hehe...
(sharing gen. info) actually sir, if it is summer in our country (february - may) the temp can raised up to 35 C. rainy season from june to august, sometimes in september. from this season to january, the temp can decrease to 8 C.
A fan by itself won't regulate the temperature of a room. A furnace will heat it if it is too cold and an air-conditioner will cool it if it gets too warm.
Thermostats for temperature sensing and control of a furnace or air-conditioner are mechanical or programmable electronic.
I've never seen a room full of people with a big heatsink on top of the room. It must be a pretty big fan.
My spelling-checker lit up on every 5th word.
You will need to define the scope or breadth of the problem to be sure that include all of the requirements.
One possible setup for the problem - you have a room that has a cooling load that always exceeds the losses thru the walls to the outside. This is true of modern office and manufacturing areas. In order to ventilate and cool the room you would supply varing amounts of conditioned air to the space. By varying the amount of conditioned air the temperature of the room can be adjusted. The amount of air delivered is determined by the fan speed. The is quite the common arrangement in commercial and industrial spaces.
I don't know if you are allowed to define the problem or if it has been done for you and you've not mentioned it because you felt it was not relevant. It does matter and would help us to help you.
I don't know if you are allowed to define the problem or if it has been done for you and you've not mentioned it because you felt it was not relevant. It does matter and would help us to help you.
I dont get much sir what u min in the line "or if it has been done for you and you've not mentioned it because you felt it was not relevant" but w/ my understanding, we can define the problem as long as we cover the conditions.
If you are allowed to define the problem I would suggest that you use the example that I described. Variable air volume is a common method for adjusting the amount of cooling or heating supplied to an occupied space. Many real life situations are such that cooling to a greater or lesser degree is always required - an internal office with lights and computers almost never needs any heat. Limiting the problem to cooling only is simpler.