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Re: [Phys-l] Heat transfer lab



The relief valve lets air out as the pressure builds allowing steam to enter the radiator. As soon as it senses steam it closes (often with a loud clang). After the boiler shuts down and the steam has condensed in the radiator, the valve opens again - there is no vacuum to deal with.

Bob at PC
________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Bennett [bennett@oakland.edu]
Sent: Friday, November 19, 2010 4:48 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Heat transfer lab

I think the vent stays open except when steam wets or heats it.

On Fri, Nov 19, 2010 at 1:01 PM, chuck britton <cvbritton@mac.com> wrote:

I suspect any 'boiler system' has to have a way to equalize to atm
pressure when the heat is off.
It's designed for pressure - but couldn't handle the vacuum that
would result upon cool down?

At 9:17 AM -0800 11/19/10, Bernard Cleyet wrote:
bc, still puzzled by from where the air comes. (Gets in the
system.) Since it's a closed system, I'd think any initially
dissolved air would soon be expelled. In domestic water systems
such air is necessary to prevent water hammer.
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--
Clarence Bennett
Oakland University
Dept. of Physics, (retired)
111 Hannah
Rochester MI 48309
248 370 3418
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