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Topic: Thermosiphon

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	Porous vapor valve for improved loop thermosiphon performance - Patent 6615912
		A loop thermosiphon according to claim 1 wherein said porous plug forms a valve that is (i) permeable to a liquid, and (ii) presents a barrier to vapor flow.
		A loop thermosiphon according to claim 6 wherein said at least one evaporator comprises a layered wick evaporator, having a wick formed on an interior surface of said chambered enclosure and is interconnected in flow communication with a wick disposed within a portion of said condensate conduit.
		A loop thermosiphon according to claim 5 wherein said porous plug forms a valve that is permeable to said liquid at a significantly reduced flow rate relative to a flow rate for an unobstructed portion of said condensate conduit.
	www.freepatentsonline.com /6615912.html (3761 words)

	Thermosiphon for cooling a high power die - Patent 5582242
		Thermal interfaces between the die and the thermosiphon are eliminated by directly coupling the die to the thermosiphon.
		Contaminant at the joint between the thermosiphon and the package housing are reduced by the use of a shrink ring seal.
		The thermosiphon fluid 32 of the invention enhances performance, is non-toxic, and is not considered flammable or combustible by standards established by the Department of Transportation.
	www.freepatentsonline.com /5582242.html (4147 words)

	Plate fin heat exchanger built-in type multi-stage thermosiphon - Patent 5385203 (Site not responding. Last check: 2007-10-29)
		According to the present invention there is provided a small-sized thermosiphon free from deterioration in its cooling efficiency caused by pressure loss of a refrigerant and in which a two-phase flow of a fluid to be cooled is sure to be distributed uniformly.
		The thermosiphon includes a cooling cylinder 1 having a plurality of independent refrigerant tanks 2 formed by partition walls 1c which are disposed between fluid inlet port 1a and outlet port 1b inside the cylinder, and a plate fin type heat exchanger 50 extending inside the cylinder through the partition walls 1c hermetically sealably.
		Under this construction, it is not necessary to use pipes for the circulation of refrigerant C between the refrigerant tanks 2 and refrigerant circulation paths 54 in the heat exchanger 50, thus preventing the deterioration of the cooling efficiency caused by pressure loss of the refrigerant.
	www.freepatentsonline.com:9003 /5385203.html (2934 words)

	Thermosiphon Water Heaters (Site not responding. Last check: 2007-10-29)
		Thermosiphon water heaters use solar panels or collectors to trap the sun's heat.
		Thermosiphon water heaters require no outside source of power because they use the natural tendency of water to rise as its temperature increases to push water from the collectors to the storage tank, which must be located 1-1/2 feet or more higher than the collectors.
		Thermosiphon systems may be able to supply up to 70 percent of a family's annual hot water needs.
	tva.apogee.net /res/rewhsts.asp (157 words)

	Solar water systems
		Due to the thermosiphon effect (the warmer the fluid, the lighter it is) the heated fluid rises naturally inside the tubes.
		With a thermosiphon system, both the storage tank and the solar collector panels are mounted on the roof.
		The thermosiphon effect is enough to circulate the fluid from the panel into the tank without an additional pump.
	www.choice.com.au /viewarticleasonepage.aspx?id=100954&catId=100519&tid=100008&p=1 (1491 words)

	7 Solar Water Heating System Designs by Michael Hackleman Issue #65 (Site not responding. Last check: 2007-10-29)
		Thermosiphon results when water heated in the collector expands and rises, pushing cooler water in the rest of the loop into flowing.
		One disadvantage of thermosiphon flow is that the plumbing must follow strict guidelines—bigger tubing, gentle turns, no low spots, and no restrictive valves—to ensure a smooth, unrestricted flow.
		For thermosiphon flow, this is not a good arrangement; you want the cold water return to the collector to exit directly from the bottom of the tank (Fig.
	www.backwoodshome.com /articles/hackleman65.html (4619 words)

	Frequently Asked Questions (Site not responding. Last check: 2007-10-29)
		A thermosiphon is a closed loop system which relies on the differences in density between the gaseous and liquid phases of the media to induce flow within the loop.
		Due to the nature of the thermosiphon, the compressor should be located within four feet of the evaporator.
		Additionally, there needs to be a minimum of 5” vertical separation between the cooler and the lowest point of the evaporator, and the tubing carrying liquid to the evaporator should have a constant downward slope from the cooling unit to the evaporator.
	www.avxcel.com /frequently_asked_questions.php (604 words)

	Celebrating Over 20 Years
		Thermosiphon units are a completely passive design that relies on buoyancy effects as opposed to pumps and controllers to circulate fluid through the collectors.
		Thermosiphon systems have insulated storage tanks which dramatically reduce nighttime losses.
		Thermosiphon systems use no pumps and electronic controls that require maintenance and consume electricity.
	www.mohrpower.com /mpweb/solardhw.htm (272 words)

	[No title]
		Good Freeze Protection for Mild Freezes Thermosiphon units (with separate tank and collectors) have serious problems with their collectors freezing and bursting, even in areas with only one or two mild freezes a year.
		Thermosiphon solar heaters depend on electrical power and/or water pressure (for freeze dribble valves) for freeze protection, so woe to you and your solar water heater if the power goes out during a freeze.
		Thermosiphon systems also have problems in hard water areas that batch heaters do not.
	www.ibiblio.org /intergarden/alternative-energy/homepower-magazine/archives/31/31p61.txt (1295 words)

	Manual 01 - Section 07
		All the Solahart domestic solar hot water systems are dependant on the natural thermosiphon principle for circulation of the heated collector fluid to the storage tank or vessel jacket.
		The potable water in the bottom of the tank flows down the cold down pipe at the left hand side of the collector and enters the bottom collector header to replace the heated water within the collector.
		The typical thermosiphon flow of the closed circuit J or K system is as shown below.
	www.digal.pt /Digal_i/s07.html (1154 words)

	Vital Signs - The Siegel House
		The house was designed to use a thermosiphon loop sytem with 14-foot-high steel tubes filled with river rock for thermal storage.
		In this report, student investigators examine how this design has fared over the years, specifically looking at the operation of the thermosiphon loop, comfort in the sunspace, effectiveness of thermal mass in the house, and stack effect in the two-story living room.
		They discover that several passive solar aspects of the design, in particular the thermosiphon loop, do not operate as originally intended by the designers.The owners have made a number of revisions to the house that also have an impact on its thermal performance.
	arch.ced.berkeley.edu /vitalsigns/bld/Casestudies/Abstracts/ucb_siegel_ab.html (155 words)

	Countryside & Small Stock Journal: Thermosiphon engine cooling: while this system is larger than pressurized cooling ... (Site not responding. Last check: 2007-10-29)
		Thermosiphon engine cooling: while this system is larger than pressurized cooling systems, it does have advantages.
		According to Webster's 1913 dictionary, a thermosiphon is "...an arrangement of tubes for assisting the circulation in a liquid." This simple definition translates into a simple system to cheaply and effectively cool any stationary water-cooled internal-combustion engine used on the homestead or elsewhere.
		It is not uncommon to find low to medium horsepower internal-combustion engines used on homesteads throughout the U.S. for generating electricity, pumping water, milling lumber, etc. Most of these engines are of the air-cooled variety, but some enjoy the benefit of...
	www.highbeam.com /library/doc0.asp?DOCID=1G1:131865505&refid=holomed_1 (240 words)

	The Siegel House - Background: The Siegel House Design
		The Siegel House is designed primarily around a passive solar design scheme that uses a thermosiphon loop.
		In a thermosiphon loop, the buoyancy of warm air is used to circulate heat from a collector area to a storage area.
		The three main components in the thermosiphon loop are shown in the diagram at left.
	arch.ced.berkeley.edu /vitalsigns/workup/siegel_house/sgl_bkgd.html (856 words)

	Great hot water comfort with solar storage tanks
		The thermosiphon storage tank Logalux SL is also protected against corrosion by the thermal glazing DUOCLEAN MKT.
		The upright, cylindrical Logalux PL storage tank is made of sheet steel and has connections for the heat generator and the heating circuits.
		With a certain delay, it transfers the heat to the water in the buffer part which is used to support the heating.
	www.heiztechnik.buderus.de /sixcms/detail.php/1737762 (879 words)

	Welcome to Linuo Paradigma! (Site not responding. Last check: 2007-10-29)
		The special, improved geometry of the mirror ensures that direct and diffuse sunlight falls onto the absorber even when the angle of incidence is not ideal.
		The thermosiphon system is a non-pressurized open loop system.
		The system relies on warm water rising, a phenomenon known as thermosiphon effect, to circulate water through the tubes and to the tank.
	linuo-paradigma.com /EN/FAQ (158 words)

	Thermosiphon (Site not responding. Last check: 2007-10-29)
		The world's finest thermosiphon storage tank and rugged, high performance flat plate solar collectors.
		A Thermosiphon unit is a completely passive design that relies on buoyancy effects to circulate fluid through the collectors as opposed to the pumps and controllers found in active systems.
		During periods of no sun, the cool fluid in the base of the collectors is not heated, does not rise, and thereby stops circulation of the antifreeze.
	www.solartrope.com /new/solar_w_siphon.htm (180 words)

	Solar Water Heating - Purchasing a Solar System
		The beauty of the Thermosiphon is that it efficiently uses natural thermosyphoning to heat the water and does not need a second pump for the closed solar loop.
		A small amount of soldering is required to hook up the Thermosiphon heat exchanger to your existing or to an additional water heater.
		Thermosiphon Heat Exchanger with Expansion Tank and all Connections (in place of "Quick Connect").
	www.biznet1.com /ae/solar-water-heaters/purchase (1530 words)

	Thermosiphon patent (Site not responding. Last check: 2007-10-29)
		It is, accordingly, an object of the present invention to provide a thermosiphon which can reduce the lowering of the efficiency of absorbing a heat of a container even if a cooling box equipping the thermosiphon tilts.
		[0009] Alternatively, in the above-described thermosiphon, the condensing member may be configured that the refrigerant is filled in the pipe and a portion of the pipe is thermally contacted by at least one heat-conduction block, the heat-conduction block being provided on a heat-absorbing section of the refrigerating machine.
		6 is a perspective view showing a structure of a thermosiphon according to a fifth embodiment of the present invention.
	www.freshpatents.com /Thermosiphon-dt20050526ptan20050109057.php (854 words)

	Frequently asked questions (Site not responding. Last check: 2007-10-29)
		The same thermosiphon process occurs, but in this case, the heat is "exchanged" from the closed circuit to the water in the cylinder.
		There are two types used, a conventional thermosiphon system with the storage cylinder mounted above the collectors either externally or internally and a forced circulation system with the storage cylinder positioned at any convenient point within the home.
		Collectors are mounted on the roof, and a small circulation pump moves the heat energy from the collectors to the cylinder.
	www.solarheat.co.za /faq.asp (4906 words)

	FF01
		When the sun's heat is no longer present, the thermosiphon effect stops, and hot water retained in the storage tank stays hot because of the tank's high density insulation and design.
		A jacket is located around the complete circumference of the potable water storage tank and this jacket is connected to the absorber.
		The same thermosiphon process occurs, but in this case, the heat is "exchanged" from the closed circuit to the water in the tank.
	www.digal.pt /Digal_i/ff01.html (788 words)

	TIMOR - Thermosiphon & Interface based MOdular Refrigerator
		Customers demands for cheaper products with great choice opportunities offer challenges for manufacturers to develop a wide range of products or variations, whilst at the same time maintaining low cost and rational manufacture through standardisation.
		The secondary system is a self-circulating unit known as a thermosiphon.
		The new system, including the compact condenser and the new air channels decrease energy-consumption by 2% compared to the reference refrigerator.
	epubl.luth.se /1402-1617/2000/083 (350 words)

	Island Hot Tub Company/Chofu Heaters - Propane Chofu Heater
		Like the Chofu Wood-Fired, the Propane Heater circulates water by thermosiphon (the pumping action created by rising hot water, see illustration), eliminating the need for a circulating pump or electricity.
		Inside the Chofu is an elaborate network of copper tubes with heat collecting fins, that are heated by six stainless steel burners.
		The configuration of the copper tubes is designed to create thermosiphon circulation by allowing the heated water inside the heater to rise up and flow into the tub.
	www.islandhottub.com /prophtr.html (385 words)

	Epics Proposal Viewer
		Started as a student design and construction project in spring semester 1999 at the Center for Sustainability’s former research site, the structure which supports the solar thermosiphon roof has been moved and set up at the Center’s new Research and Demonstration Site for Ecological Technologies off of Porter Road, past football parking area 25.
		The structure has been modified to accommodate a stand-alone composting toilet (not yet set up), and two sinks - an interior one for hand-washing, and an exterior one for washing garden produce.
		The interior of the structure has a 6’ x 9’ footprint; the Lexan glazing component of the thermosiphon is 4’ x 12’.
	labs.ee.psu.edu /courses/epics/view.asp?form=26 (177 words)

	TractorByNet.com - Overheating 1610D
		If you do have thermosiphon (no pump) make sure you just have distilled water in the system since antifreeze will really make the system not cool well due to decreased circulation.
		The critical factor is the ability of either liquid to dissipate heat, and water dissipates heat faster than glycol solution.
		The thermosiphon issue I said I was not aware of on the 1610.
	www.tractorbynet.com /forums/showflat.php?Board=yanmar&Number=456225 (905 words)

	Home-Barista.com - Odd Expobar problem - no thermosiphon
		Operating the vibe pump seems to get this flow going - I assume it is injecting cold water into the HX coil at the bottom, and this either jumpstarts the thermosiphon or physically circulates the water through the grouphead (I am uncertain).
		Once I have "kickstarted" the thermosiphon using the vibe pump, it stays hot all day.
		So if it was leaking or had some debris in it, it might try and pump water to the boiler when it should be pumping to the HX.
	www.home-barista.com /forums/viewtopic.php?t=538 (3500 words)

	Compact thermosiphon with enhanced condenser for electronics cooling page
		A heat sink assembly for cooling an eIectronic apparatus includes a fan housed in a shroud, the fan comprising a hub and fan bIades eхtending therefrоm for саusing an axiaI ly direсted airfIow via the shroud uроn rotation of the fan bIades.
		A thermosiphon includes an evaporator defining an evaporating chamber enclosing a working liquid there and additional comprising a condenser mоunted thereabove.
		The thermosiphon is роsitiоned at single finish of the shroud suсh thаt the fan is aIigned with the condenser for directing the proper airfIow there through.
	www.patentalert.com /docs/001/z00106744.shtml (244 words)

	Stirling refrigeration system with a thermosiphon heat exchanger (Site not responding. Last check: 2007-10-29)
		The inclusion might comprise a thermosiphon and a Stirling cooIer.
		The thermosiphon might comprise a condenser finish and an evaporator finish.
		The ends might be connected by a little diameter pipe and a empty diameter pipe.
	www.patentalert.com /docs/530/z53053875.shtml (64 words)

	REPP-CREST : ABOUT RENEWABLE ENERGY (Site not responding. Last check: 2007-10-29)
		First, for those who don’t know this type of system, let me explain that a thermosiphon solar water heater is a fairly simple system that has its storage tank mounted above the collector (usually on the roof) to provide a natural gravity flow of water.
		You might also ask a roofing contractor to inspect the trusses and see if they are sturdy enough.
		By the way, the thermosiphon system is the most popular system used around the world.
	listserv.repp.org /articles/static/1/1014806268_982708676.html (691 words)

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