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- From: rbw3q@rayleigh.mech.Virginia.EDU (Brad Whitehurst)
- Subject: Re: Lorenz' Weather
- Message-ID: <1992Nov20.224219.25645@murdoch.acc.Virginia.EDU>
- Sender: usenet@murdoch.acc.Virginia.EDU
- Organization: University of Virginia
- References: <1e7bmaINNslq@network.ucsd.edu> <1992Nov19.233804.19456@murdoch.acc.Virginia.EDU> <gordon.722277803@tramp.Colorado.EDU>
- Date: Fri, 20 Nov 1992 22:42:19 GMT
- Lines: 42
-
- In article <gordon.722277803@tramp.Colorado.EDU> gordon@tramp.Colorado.EDU (GORDON ALLEN R) writes:
- >rbw3q@rayleigh.mech.Virginia.EDU (Brad Whitehurst) writes:
- >>>
- >> Quite a lot of solar heating systems were/are set up that
- >>way. They are not as high performance as forced circulation, but
- >>then, they don't have all the hardware, either. The cooling systems
- >>in some old engines were thermosyphon also. And any process where you
- >>are heating a vessel from the bottom could exhibit this behavior,
- >>couldn't they? (you'd have convection cells, rather than water
- >>running in a pipe, though)
- >
- >A couple of fairly recent applications include some very inexpensive solar
- >hot water systems, that circulate heated water from the collector to the
- >storage tank by virtue of the convective effect.
-
- Actually, that kind of solar heater has been popular since the
- late '60s for pool heating and household hot water, esp. in the solar
- heyday of the oil embargo era. (Remember those fun Whole Earth
- Catalogs??)
- >
- >There is a device that uses heat from a wood stove to heat water in a coil
- > that rises to a special condenser above the stove. The heated water then
- >circulates around a closed heating loop and back to the coil in the stove.
- >
- Also the "heatilator" fireplace inserts. Some are fan driven,
- and some are passive.
-
- >Its all 'passive'. Is not the old coffee percolator an example of this effect?
-
- Actually, a percolator cheats. It has a check valve in the
- stem of the basket. Also, it may depend on a little local boiling to
- get a 2 phase flow.
- >
- >allen
- >--
-
- Brad
-
- --
-
- Brad Whitehurst | Aerospace Research Lab
- rbw3q@Virginia.EDU | We like it hot...and fast.
-