Hooking up a cold rad to 80C water

[sukhjeetgrewal]

I had asked this question somewhere else aswell.
What would happen if I hook up a Cold Radiator to an 80C hot water system all of sudden.

Apart from getting too hot as usual my concern is WOULD THAT DAMAGE THE RADIATOR IN ANY WAY.
I know one thing for sure that hot metal will suddenly expand and will make creaking noises.

Any other effects on the Rad.

Kind Regards
Gary

 

[Jackrae]

so why would you "suddenly" connect it to the system. simply crack one of the valves open slowly.

 

[sukhjeetgrewal]

so why would you "suddenly" connect it to the system. simply crack one of the valves open slowly.

well Im researching on sudden ramp up time
we are trying to find out what happens if we introduce sudden hot water (like if radiator systems are connected to a hot water storage cylinder)

would there be any bad effects if do it on a daily basis
we are trying to build a boiler system that stores 80C water

thanks

 

[Dan Robinson]

I'm not sure I should ask...but why?


Anyway, they're not made of glass.

 

[Jackrae]

What you ask about is absolutely no different than a multizone system in which a closed zone valve is driven open to connect a collection of cold radiators onto an already hot circulating system.

 

[sukhjeetgrewal]

I'm not sure I should ask...but why?


Anyway, they're not made of glass.

Please ask any question you want I might learn something.

The problem with metal is that when it gets hot it expands a bit.

If we do it slow and steady. the expansion will also be slow(unnoticeable)
If we do it fast that metal will expand at quite a high rate. and i've heard that some one heard loud creeks when he did that .

My question is that does if you do it suddenly on a daily basis what are the side effects

Kind Regards

 

[Dan Robinson]

The odd creak is the only side effect.

But I am struggling to imagine what you are doing that is any different to a thermal store.

 

[sukhjeetgrewal]

The odd creak is the only side effect.

But I am struggling to imagine what you are doing that is any different to a thermal store.

I couldnt find any boiler which stores 80 degree water. I'd appreciate if you can suggest me a boiler that has similar system.

All i know is that normally when heating is turned on. there is a gradual rampup because the burner comes on and water starts from cold. then gets to 25..30..35... and so on
But then thing that im gonna try will have a sudden one.
water stored at 80 degree pushed into heating using a pump

cheers.

 

[petertheplumber12]

In New York I was in an apartment with about 25 apartments on 7 floors and they were all heated by a central boiler in the basement which heated them with steam.
When the heating came on you could hear the steam condensing in the rads but nothing about rads creaking with sudden expansion. Perhaps you should be investigating the effects of steam since that is much more violent,
The temp change in a rad wont be that sudden since it will start off with cold water in it and that will be change to hot, that wont be instant.
Most of the noise on steel rads is caused by the movement of the rad on the bracket when they expand that is why they now supply plastic clips top go on the bracket.

 

[Dan Robinson]

I couldnt find any boiler which stores 80 degree water. I'd appreciate if you can suggest me a boiler that has similar system.

All i know is that normally when heating is turned on. there is a gradual rampup because the burner comes on and water starts from cold. then gets to 25..30..35... and so on...

But why? The ramp up is there to improve efficiency especially with TPi controls.

Why do you need to dump 80 degrees into a rad stragiht away?

Why 80? Sub 60 is best.

 

[sukhjeetgrewal]

I couldnt find any boiler which stores 80 degree water. I'd appreciate if you can suggest me a boiler that has similar system.

All i know is that normally when heating is turned on. there is a gradual rampup because the burner comes on and water starts from cold. then gets to 25..30..35... and so on...

But why? The ramp up is there to improve efficiency especially with TPi controls.

Why do you need to dump 80 degrees into a rad stragiht away?

Why 80? Sub 60 is best.

Hello Dan,

Please forgive me I have no idea about TPi control. Might be worth looking into. regarding you previous question if its any different to any other store.

normal system store boilers have a heat exchanger between the store and heating system. so even in that case there is a slow rampup.

In my case im going to store hot water in a cylinder first and when the heating is turned on .. the same stored water(@80C) is pushed into the system. I think it will save time on heating any apartment and thus a lot of energy.

Please let me know what you think.

Kind Regards

 

[Dan Robinson]

But But why do you want to dump heat at 80 to the heating.

What you are talking about is a thermal store and it's nothing new.

My wind up spidey senses are tingling.

 

[sukhjeetgrewal]

In New York I was in an apartment with about 25 apartments on 7 floors and they were all heated by a central boiler in the basement which heated them with steam.
When the heating came on you could hear the steam condensing in the rads but nothing about rads creaking with sudden expansion. Perhaps you should be investigating the effects of steam since that is much more violent,
The temp change in a rad wont be that sudden since it will start off with cold water in it and that will be change to hot, that wont be instant.
Most of the noise on steel rads is caused by the movement of the rad on the bracket when they expand that is why they now supply plastic clips top go on the bracket.

Hello Peter,
Thanks for the suggestion. I think you are right about steam being more violent as we are dealing with more than 100 degrees over here.
I will start searching for problems associated with steam heating. I'm sure i'll find something on it.

About the second para I have never really seen a radiator expanding. Its all just imagination at the moment. I dont want to end up bursting a radiator. that is great info you provided over there.

thanks again

 

[Jackrae]

sounds a bit like a school project with the homework being done by others

 

[JohnD]

teapot.

cold.

boiling water poured into it.

Damage? Nil.

Do it dozens of times a day.