Timer circuit

[HomerDodd]

I made a solar pool heater, but want to regulate the outlet flow. If it just flows unregulated, the water does not get warm enough.It needs more time in the sun before going into the pool. I want to install a sprinkler valve controlled by a timer circuit that will open at 3, 4 or 5 minute intervals and remaining open for approx 1 minute on time before shutting off. This will allow the water to absorb sunlight and heat up before discharging into the pool, essentially cycling on and off throughout the day. Hope this makes sense ! Can you give me some schematics for such a device. I can make it fixed time amount or adjustable. Much appreciated !! Thanks

 

[kellys_eye]

Easiest way for the non-electronics-inclined is to purchase a timer relay that has all the functionality you require and only needs you to connect the output contacts to the solenoid used to control the flow.

Companies such as RS Components (there are others) offer many such devices and you can chose the type you need from a 'list' by making various option selections (operating volatge, timer function, number of contatcs etc) - have look here:

https://uk.rs-online.com/web/c/relays-signal-conditioning/relays/timer-relays/

By far the simplest version would be to slow the flow of water through the heater though..... turn the tap down.

 

[Harald Kapp]

volatge

My own favorite typo
I can't remember how often I corrected this in my own writing - even less how many times I didn't recognize my fault. Glad others have this problem, too.

 

[bidrohini]

The easiest solution that is comming to my mind is,

Power supply-》 Arduino...》Relay...》Sprinkler

 

[Harald Kapp]

The easiest solution that is comming to my mind is,

Power supply-》 Arduino...》Relay...》Sprinkler

I think @kellys_eye 's approach is even more simple.

 

[Alec_t]

I don't see how using a timer will help.
If you slow down the average flow rate by a factor of 3, 4, or 5 as per post#1 then the pool will, of course, take proportionally longer to heat up to the required temperature. The total heat energy added to the pool over that longer period will be the same, with or without the timer.

 

[Delta Prime]

I can't remember how often I corrected this in my own writing - even less how many times I didn't recognize my fault. Glad others have this problem, too.

I'm dyslexic I don't see any probelm.

 

[danadak]

Why not base the timer on Temperature ? And sunlight level and or time of day ?


Regards, Dana.

 

[AnalogKid]

Per kelly's suggestion:

programmable timer relay for sale | eBay

Get the best deals for programmable timer relay at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items!

www.ebay.com

ak

 

[Delta Prime]

Can you give me some schematics for such a device

Asking for schematic is someone who's inclined. Because of your previous posts I have to ask this question... Did you put a pool in one of your Cadillac's?

 

[HomerDodd]

Asking for schematic is someone who's inclined. Because of your previous posts I have to ask this question... Did you put a pool in one of your Cadillac's?

If you can't answer my requests, please just don't respond. Your question if childish and stupid. BTW, I fixed the Cadillac in question as I needed and sold it.

 

[HomerDodd]

Why not base the timer on Temperature ? And sunlight level and or time of day ?


Regards, Dana.

That would work too. Once e temperature is reached the valve opens, allowing the hot water into the pool. THanks! How do I build it?

 

[HomerDodd]

I don't see how using a timer will help.
If you slow down the average flow rate by a factor of 3, 4, or 5 as per post#1 then the pool will, of course, take proportionally longer to heat up to the required temperature. The total heat energy added to the pool over that longer period will be the same, with or without the timer.

Wrong. The longer the water stays in the heater grid hoses the hotter it becomes. I've measured it at several intervals, it gets over 115 degrees on a hot day after not flowing for about 8-10 minutes, it will scald my hand after sitting in those black, coiled and hot grids. Now once again, can you give me a timer or temperature circuit to control the opening and closing of the valve? it is a simple yes or no question, thanks

 

[HomerDodd]

Easiest way for the non-electronics-inclined is to purchase a timer relay that has all the functionality you require and only needs you to connect the output contacts to the solenoid used to control the flow.

Companies such as RS Components (there are others) offer many such devices and you can chose the type you need from a 'list' by making various option selections (operating volatge, timer function, number of contatcs etc) - have look here:

https://uk.rs-online.com/web/c/relays-signal-conditioning/relays/timer-relays/

By far the simplest version would be to slow the flow of water through the heater though..... turn the tap down.

I have slowed it with a valve, but then the volume is too low to make a difference. I need to regulate output, that is the goal here.

 

[Delta Prime]

BTW, I fixed the Cadillac in question as I needed and sold it.

Thank you for answering.

 

[Delta Prime]

Or perhaps a feedback circuit
The bypass valve..

 

[kellys_eye]

I have slowed it with a valve, but then the volume is too low to make a difference. I need to regulate output, that is the goal here.

What has the volume got to do with it? The way you describe the situation you'd need to regulate the Sun....

You can't adjust the volume without adjusting the outlet temperature - slower=hotter, faster=cooler. 'Holding' water in the system until it reaches the desired temperature just results in a stop-go solution and adds complication.

The total heat/volume content ends up the same (mixed). Obviously you don't want to scald anyone so slowing the flow to a level that gives the desired temperature but keeps a constant flow should be the aim and a simple tap regulating the flow will do that. OK, it's not accurate to 'decimal point' values but does that matter?

@Delta Prime shows two complex systems that will work but the KISS principle applies and the complexity - as shown - will show zero different results from a part-open tap.

 

[Delta Prime]

This timer has 4 tabs per hour covering 24 hours in a day. That means that the timer turns something on and off in increments of 15 minutes. You could conceivably turn something on and off 48 times a day .Here's schematic with idiot lights on it.

 

[kellys_eye]

Cheap and cheerful - use a thermostatically controlled bath tap and feed cold water and the solar to it and set it to whatever temperature you want.

It's a circulatory system isn't it? Doesn't matter of the water going in is too cold as it will warm up when the sun shines!

 

[Bluejets]

By far the simplest version would be to slow the flow of water through the heater though..... turn the tap down.

hehehe....yup, my first thought also.
Although, there is most likely a good reason why it is designed to operate the way it is.