If D from BC were a plumber:
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From: Archimedes' Lever on 17 Apr 2010 12:27 On Sat, 17 Apr 2010 16:32:34 +0100, Baron <baron.nospam(a)linuxmaniac.nospam.net> wrote: >Its not unknown for debris to build up in the pipe and lodge in a bend >to cause varying water pressure and flow. Nope. Such a blockage as you describe is rare, but any such blockage will only affect flow rate maximum, and NEVER pressure. The pressure will always rise to the same pressure on the feed side of the blockage. Figure out how water pressure regulators and gas pressure regulators work. It is not by mere blockage.
From: Baron on 17 Apr 2010 12:41 Archimedes' Lever Inscribed thus: > On Sat, 17 Apr 2010 16:32:34 +0100, Baron > <baron.nospam(a)linuxmaniac.nospam.net> wrote: > >>Its not unknown for debris to build up in the pipe and lodge in a bend >>to cause varying water pressure and flow. > > > Nope. Such a blockage as you describe is rare, but any such > blockage will only affect flow rate maximum, and NEVER pressure. > > The pressure will always rise to the same pressure on the feed side > of the blockage. Agreed ! Bad choice of words. > Figure out how water pressure regulators and gas pressure regulators > work. It is not by mere blockage. -- Best Regards: Baron.
From: Copacetic on 17 Apr 2010 12:41 On Sat, 17 Apr 2010 16:44:54 +0100, Baron <baron.nospam(a)linuxmaniac.nospam.net> wrote: >I disagree. The transfer of heat would take place even if the water >were moving in either or both pipes. > You do not understand at all. Once water begins moving, the temperature of the water FEEDING that point in the pipe is the master that defines the temperature of the flow from that point on. You need to understand how in-line water heaters work. They burn 1200 watts or more to heat water flowing directly over the radiating heating element. The coupling between two pipes, even if they were soldered to each other would come nowhere near ANY ability to transfer the thousands of BTUs required to heat the water once in motion. So, the HOT side would HAVE to be on, at at least a trickle, to maintain its feed water temp. THAT heat would then require several minutes to transfer over to JUST THAT SHORT segment of a pipe full of non moving cold water. If it moves, the job is killed immediately. If they are both moving, the job is killed. If neither is moving, the job is killed by homogenization with each other and ambient air. Regardless, your contention is about as dubious as it gets. Even the operation of a simple water cooled PC CPU proves these facts. If the water is not moving, the cpu only heats the water local to the contact face. Once moving, the system water bath temp takes over... BIG TIME. Think before you refute. Otherwise you re-size your mouth with your foot.
From: Baron on 17 Apr 2010 12:47 krw(a)att.bizzzzzzzzzzzz Inscribed thus: > On Sat, 17 Apr 2010 16:44:54 +0100, Baron > <baron.nospam(a)linuxmaniac.nospam.net> wrote: > >>Copacetic Inscribed thus: >> >>> On Thu, 15 Apr 2010 19:26:01 -0700, Charlie E. <edmondson(a)ieee.org> >>> wrote: >>> >>>>Two possibilities. First, the hot and cold line for the shower may >>>>be adjacent, so the cold line is slowly heated to the same temp as >>>>the >>>>hot line. then, when you run the hot line, it gets a little cooler >>>>as the tank goes down, but the cold is still the same temp. >>>> >>>>OR >>> >>> >>> That is silly. To heat the cold water pipe's water, said water >>> would >>> have to be stationary. >>> >>> Otherwise, the water temp flowing in the pipe RULES against any >>> peripheral heating. >>> >>> A completely silly suggestion. >> >>I disagree. The transfer of heat would take place even if the water >>were moving in either or both pipes. >> >>> So, IF the hot water is the ONLY water on for a LONG enough time >>> to >>> heat a siamesed pipe's water (A VERY LONG TIME), THEN said water >>> would be warm or hot, but that would end IMMEDIATELY, once the water >>> in that >>> pipe is turned on. If the hot water is not ran constant, it too >>> will cool to ambient temps. >> >>Its quite common to lag together both hot and cold pipes for a common >>run. The idea is that the hot water flow prevents the cold water >>freezing in its pipe and causing a burst. > > I have *never* seen anyone do such a stupid thing, even in Vermont > where it does get cold (and there is an overabundance of stupid people > - Demonicrats). Just because you have never seen it done, doesn't mean it isn't nor does it make it stupid. I don't see what it has to do with politics either ! >>Admittedly a much less common occurrence nowadays with the use of >>plastic pipes. >> >>> A totally false claim you have made there. -- Best Regards: Baron.
From: Copacetic on 17 Apr 2010 12:46
On Sat, 17 Apr 2010 16:44:54 +0100, Baron <baron.nospam(a)linuxmaniac.nospam.net> wrote: >Its quite common to lag together both hot and cold pipes for a common >run. The idea is that the hot water flow prevents the cold water >freezing in its pipe and causing a burst. That is flawed logic, and this is true, even in colder climates, and would ONLY work if the hot side was kept flowing at all times at each endpoint it is carried to. As soon as flow ceases, the hot begins moving toward the local ambient temp all the way back to the water heater itself. Basic common sense. |