Experimental studies on heat transfer and friction factor characteristics of thermosyphon solar water heater system fitted with spacer at the trailing edge of twisted tapes

Jaisankar, S.; Radhakrishnan, T. K.; Sheeba, K. N.

doi:10.1016/j.applthermaleng.2008.06.009

Cited by 149 publications

(42 citation statements)

References 12 publications

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“…They found that the direction of twist to grooved surface (clockwise and anticlockwise) influenced the thermo-hydraulic characteristics. Jaisankar et al [13] investigated the heat transfer and friction factor characteristics of thermosyphon solar water heater system with full length twist tape, twist tape fitted with rod and spacer fitted at the trailing edge. It was observed that the overall performance for the twist tape fitted with rod was greater than that for the twist tape fitted with spacer.…”

Section: Introductionmentioning

confidence: 99%

Turbulent heat transfer enhancement by counter/co-swirling flow in a tube fitted with twin twisted tapes

Eiamsa-ard

Thianpong

Eiamsa-ard

2010

Experimental Thermal and Fluid Science

241

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Section: Introductionmentioning

confidence: 99%

Turbulent heat transfer enhancement by counter/co-swirling flow in a tube fitted with twin twisted tapes

Eiamsa-ard

Thianpong

Eiamsa-ard

2010

Experimental Thermal and Fluid Science

241

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“…Heat transfer enhancement of about 10-15 % is reported by the use of twisted tapes, rods and spacers [7].…”

Section: Introductionmentioning

confidence: 99%

“…About 15-30 % daily average efficiency are possible with Natural Convection System (NCS) mode and 30-40 % with Forced Circulation System (FCS) mode [2,3]. Various ways of improving the system performance have been attempted over the years [4][5][6][7][8][9][10][11]. Various system configurations are attempted in [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of natural circulation type domestic solar hot water system performance by using a wind turbine

Ramasamy¹,

Srinivasan²

2011

J. Therm. Sci.

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Performance improvement of existing 200 litres capacity natural convection type domestic solar hot water system is attempted. A two-stage centrifugal pump driven by a vertical axis windmill having Savonius type rotor is added to the fluid loop. The windmill driven pump circulates the water through the collector. The system with necessary instrumentation is tested over a day. Tests on Natural Circulation System (NCS) mode and Wind Assisted System (WAS) mode are carried out during January, April, July and October, 2009. Test results of a clear day are reported. Daily average efficiency of 25-28 % during NCS mode and 33-37 % during WAS mode are obtained. With higher wind velocities, higher collector flow rates and hence higher efficiencies are obtained. In general, WAS mode provides improvements in efficiency when compared to NCS mode.

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“…Jaisankar et al also carried out several experimental investigations of heat transfer, friction factor and thermal performance of thermosyphon solar water heater systems fitted with twisted-tape insert devices. [6,7,8] The authors found that the heat transfer enhancement in the twisted tape collector was higher than in the standard collector.…”

Section: Introductionmentioning

confidence: 99%

Experimental Heat Transfer Research in Enhanced Flat-Plate Solar Collectors

Martı́n

Pinar

García

2011

Linköping Electronic Conference Proceedings

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Enhancement techniques can be applied to flat-plate liquid solar collectors towards more compact and efficient designs. Tube-side enhancement passive techniques can consist of adding additional devices which are incorporated into a smooth round tube (twisted tapes, wire coils), modifying the surface of a s mooth tube (corrugated and dimpled tubes) or making special tube geometries (internally finned tubes). For the typical operating flow rates in flat-plate solar collectors, the most suitable technique is inserted devices. Based on previous studies from the authors, wire coils were selected for enhancing heat transfer. This type of inserted device provides better results in laminar, transitional and low turbulence fluid flow regimes. To test the enhanced solar collector and compare with a standard one, an experimental side-by-side solar collector test bed was designed and constructed. The testing set up was fully designed following the requirements of EN12975-2 and allow us to accomplish performance tests under the same operating conditions (mass flow rate, inlet fluid temperature and weather conditions). In this work the preliminary results obtained are presented and the standardized efficiency curve is shown for both tested solar collectors. A relevant improvement of the efficiency has been reported and quantified through the useful power ratio between enhanced and standard solar collectors.

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Experimental studies on heat transfer and friction factor characteristics of thermosyphon solar water heater system fitted with spacer at the trailing edge of twisted tapes

Cited by 149 publications

References 12 publications

Turbulent heat transfer enhancement by counter/co-swirling flow in a tube fitted with twin twisted tapes

Turbulent heat transfer enhancement by counter/co-swirling flow in a tube fitted with twin twisted tapes

Enhancement of natural circulation type domestic solar hot water system performance by using a wind turbine

Experimental Heat Transfer Research in Enhanced Flat-Plate Solar Collectors

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