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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2026 Efficiency Improvement and Performance Analysis of Solar Collector Using Nano fluids Kumar Gaurav1, C. Uthirapathy3 1U.G. Student Dept. of Mechanical Engineering, SRM Institute of Science and Technology, Chennai, India 2Assistant Prof., Dept. of Mechanical Engineering, SRM Institute of Science and Technology, Chennai, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Solar storage tank is getting used worldwide for vasoconstrictorapplicationslargelywithinthedomesticsector for laundry garments and bathing functions. Thermo syphon flat plate solar storage tank âmayâ be a solar passive system, which may turn out plight within the temperature vary of 60â 90 computers. The warmth transfer constant, outlet temperature and entropy generation among four totally different Nano fluids like Cu water, âAl2O3 water, TiO2 water and SiO2 water provided attention-grabbing results concerning the result of Nusselt range, Bejan range, density, heat capability and potency on the performance of a solar dish. Similarly, a theoretical study on the performance of Al2O3 water nanofluid during a flat plate solar storage tank was analyzed for various particle sizes and volume fractions; conjointly the result of Prandtl range on flow and warmth transfer was analyzed exploitation FEM technique.â Key Words: Solar flat plate collector, Nano fluids, absorber tubes, flat plate collector, efficiency. 1. INTRODUCTION Flat-plate âcollectorsâ are the foremost common solar thermal technology. They carries with it an (1) Enclosure containing (2) A dark coloured absorbent plate with fluid circulation passageways, and (3) A clear cowl to permit transmission of solar power into the enclosure. A fluid is circulated through the absorber's fluid passageways to get rid of heat from the solar dish. The âcirculation fluid in tropical and sub-tropical climates is often water. In climates wherever temperature reduction is probably going, a heat-transfer fluid almost like AN automotive liquid answer could also be used rather than water, or in an exceedingly mixture with water. If a heat transfer fluid is employed, a device is often utilized to transfer heat from the solar dish fluid to a predicamenttank. The foremost common absorbent style consists of copper conduit connected to thermally conductive copperorAl fins. A dark coating is applied to the sun-facing facet of the absorbent assembly to extend itabsorptionofsolarpower.A typical absorbent coating is flat black enamel paint.Inhigher performance solar dish styles, the clear cowl is tempered glass with reduced iron compound content (the inexperienced color visible once viewing a pane of sheet glass from the side). The glass may additionally âhave a stippling pattern AN anti-reflective coating to entice a lot of solar power by reducing reflection. Absorbent piping configurations include: âą arp â ancient style with bottom pipe risers and high assortment pipe, utilized in low thermo siphon and pumped up systems; âą flooded absorbent consisting of 2 sheets of metal sealed to supply a circulation zone; âą physical phenomenon absorbent collectors consisting of many layers of clear and opaque sheets that change absorption in an exceedingly boundary layer. As a result of the energy is absorbed within the physical phenomenon, heat conversion could also be a lot of economical than for collectors wherever absorbed heat is conducted through a clothbeforethewarmthisaccumulated in an exceedingly current liquid. Polymerflatplatecollectors are an alternate to metal collectors and are currently being created in Europe. These âcould also be completely compound, or they'll embody metal plates before of freeze- tolerant water channels manufactured from synthetic rubber. Polymers are versatile and thus freeze-tolerant and may use plain water rather than liquid, in order that they'll be measured directly into existing water tanks rather than needing heat exchangersthatlower potency.âByâdispensing with a device, temperatures needn't be quite thus high for the circulation system to be switched on, thus such direct circulation panels, whether or not compound or otherwise, may be a lot of economical, significantly at low lightweight levels. Some early by selection coated compound âcollectors suffered from heating once insulated, as stagnation temperatures will exceed the polymer'sâ freezing point. For instance, the freezing point of plastic is a hundred and sixty °C (320 °F), whereas âthe stagnation temperature of insulated thermal collectorsâ will exceed a hundred and eighty °C (356 °F) if management ways aren't used. For this reason plastic isn't usually utilized in glazed by selection coated solar collectors. More and more polymers like high temperate silicones (which soften at over 250 °C (482 °F)) are getting used. Some non-plastic compound based mostly glazed solar collectors are matte black coated instead of by selection coated to scale back the stagnation temperature to a hundred and fifty °C (302 °F) or less.â
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2027 2. DESIGN Solar Water Heater Design Consideration Assumptions 1. Water Consumption 2. Inlet Temperature of water 3. Ambient Temperature 4. Inclination of Collector 5. Wind Speed 6. Fluid to heat transfer Coefficient. Characteristics of Collector- 1. Collector efficiency - the ratio of useful âgained thermal energy for period of to the solar radiation incident onto the collector for the sametime period. 2. Pressure Drop - the difference in pressure between the inlets to the collector the outlet due to circulation friction. 3. Stagnant Conditions is characterized by no fluid circulation inside collector the period in which the absorbing surface area receives a considerable incident radiation. 4. Incidence Angle Coefficient - the ratio of optical efficiency of solar with fixed beam angle of incidence to the optical efficiency of the collector at its normal. 5. Collector Efficiency Factor -the ratio of the real energy output of collector to the energy output in. the case when the total âabsorber area was at average fluid temperature with same fluid quantity of flowing water. 6. Collector Flow Factor- It is the `ratio of energy that collector can deliver at average temperature of the fluid to energy that the` collector can supply at the inlet collector temperature. 7. Collector Heat Removal Factor - It is the ratio of energy `collector output to energy output of the collector in temperature of the inlet fluid. It is temperature dependent. 8. Collector Heat -Loss Coefficient - Coefficient of thermal`loss of collector is defined as ratio of temperature difference per unit area of the coverto the`ambient temperature. 9. Incidence Angle Coefficient - The ratio âof optical efficiency of solar collector with fixed beamangleof incidence to optical efficiency âof collector at its normal. 10. Acceptance angle - theangle throughwhicha source of light can be moved and still converge at the receiver (Hsieh, 1986). A concentrator `with small acceptance angle is required to track the sun continuously while. A concentrator with large acceptance angle needs only seasonal adjustment. 11. Absorber area is total area of the `absorber surface that receives the concentrated solar radiation. 12. Concentration ratio(C) is defined as the ratio of the aperture area `to the absorber area i.e. C the optical potency is outlined because the magnitude relation of the energy absorbed by the absorbent material to the energy incident on the concentrator aperture. Fig -1: 2D view of setup Fig -2: Circular tube setup Fig -3: Triangular tube setup
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2028 Fig -4: Square tube setup 3. FABRICATION PROCEDURE Step 1: A steel plate was taken and cut into required dimensions. Step 2: The cut pieces were then welded to form containers which would later act as inlet and outlet water storage, where the initial and final temperatures of the water and aluminum oxide solution i.e. Nano fluid would be measured and noted. Step 3: The copper pipes are taken and altered the shapes in order to fit the experiment requirement of absorber tube of different geometry. The absorber tube is heated and then forged into square tube. The brazing operation was also done in case of triangular tube. The different geometry will increase the efficiency of the solar collector which is mainly due to the difference in surface area. Step 4: The solar component which is the main component containing the absorber tubes is then fabricated. The length and breadth of the collector is 14.5 inches and 12 inches respectively. Step 5: The solar collector is fabricated in such a way such that there is a glass cover at the top under which black aluminum sheet is kept. Step 6: The absorber tubes are then covered with wool so as reduce heat dissipation thus acting as insulation. Astopcock is fitted at the exit of the solar collector to regulate the flow of water and also to note the readings periodically. Fig -5: Experimental setup 4. ANALYSIS The objective of gift study is to perform CFD simulation and fabricate the reflector. The results obtained by CFD simulation are validated with experimental results. The experimental conditions âtaken for solar air collector, a similar has been used for CFD simulation. The general aimof work is grasp the flow behavior and temperature distribution of air within the reflector and compares the outlet âtemperature of air with experimental results. Fig -6: Temp VS Nano Fluids 4.1. CIRCULAR Fig -7: Circular absorber tube Fig -8: Experimental setup 4.2. TRIANGULAR Fig -9: Triangular absorber tube
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2029 Fig -10: Experimental setup 4.3. SQUARE Fig -11: Square absorber tube Fig -12: Experimental setup 5. TESTING Inlet temperature of the water and temperature of the hot water in the storage tank were tabulated on hourly basis, both the collector efficiency ofthecollectorswerecalculated. 5.1. TRIANGULAR TUBE TABLE -1: OBSERVATION (USING WATER AS WORKING FLUID) S.No I.S.T hours Inlet temperature Ti (in 0C) Outlet Temperature To (in 0C) 1 8.00 25 26 2 9.00 26 31 3 10.00 26 35 4 11.00 27 43 5 12.00 28 46 6 13.00 29 49 7 14.00 30 48 TABLE -2: OBSERVATION (USING AL2O3 AS WORKING FLUID) S.No I.S.T hours Inlet temperature Ti (in 0C) Outlet Temperature To (in 0C) 1 8.00 25 27 2 9.00 25 33 3 10.00 26 36 4 11.00 26 45 5 12.00 27 47 6 13.00 28 50 7 14.00 30 48 5.2. CIRCULAR TUBE TABLE -3: OBSERVATION (USING WATER AS WORKING FLUID) S.No I.S.Thours Inlet temperature Ti (in 0C) Outlet Temperature To (in 0C) 1 8.00 25 25 2 9.00 26 30 3 10.00 26 34 4 11.00 27 41 5 12.00 28 43 6 13.00 29 47 7 14.00 30 46 TABLE -4: OBSERVATION (USING AL2O3 AS WORKING FLUID) S.No I.S.T hours Inlet temperature Ti (in 0C) Outlet Temperature To (in 0C) 1 8.00 25 26 2 9.00 25 32 3 10.00 26 35 4 11.00 26 44 5 12.00 27 46 6 13.00 27 50 7 14.00 30 47 5.3. SQUARE TUBE TABLE -5: OBSERVATION (USING AL2O3 AS WORKING FLUID) S.No I.S.T hours Inlet temperature Ti (in 0C) Outlet Temperature To (in 0C) 1 8.00 25 26 2 9.00 25 34 3 10.00 26 37 4 11.00 26 43 5 12.00 27 45 6 13.00 28 49 7 14.00 30 46
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2030 TABLE -3: OBSERVATION (USING WATER AS WORKING FLUID) 6. CALCULATION Calculation of Instantaneous Efficiency Constant Terms:- Length of the absorber plate âLâ = 14.5 inches Breadth of absorber plate âBâ = 12 inches I.S.T (When reading was taken) = 11.00 Hrs. Location of Chennai = 13.0827° N, 80.2707° E I.S.T Longitude = 82.5 degree East Date of experiment = 8th and 9th April 2019 Collector is facing due south Mass flow rate = 0.5 LPM Variable Terms:- Inlet temperature of water = XÂș C Outlet temperature of water = XÂș C Angle of tilt = XÂș Average Solar irradiation on earth (in terms of energy) R = 900 W/m2 Hr. Solar irradiation on earth in 7 hours (in terms of energy) R = 900*7 W/m2 day R = 6300 Wh /m2 R = 22680000 W Sec/m2, where A = Area of Flat plate collector in m2 T1 = inlet temperature (in ÂșC) T2 = outlet temperature (in ÂșC) Specific heat of water = 4.182 KJ KG ÂșK Area of the flat plate collector, A = L W m2 = 14.5*12 inches = 0.11.4 m2 Q = MCP (T2-T1) η = For Triangular tube:- Q=100*4.187*103(47-27)=837400000 J η = (837400000/23014700) = 36% For circular tube:- Q= 100*4.187*103(44-28) =669920000 J η = (669920000/23014700) = 29% For square tube:- Q= 100*4.187*103(48-27) =628050000 J η = (628050000/23014700) = 27% 7. RESULT AND DISCUSSION This paper bestowed a review of the nanofluid applications in solar thermal engineering. The experimental and numerical studies for solar collectors showed that in some cases, the potency may increaseremarkablybyvictimization nanofluids. Of course, it's found that employing a nanofluid with greater volume fractionation, always isn't the simplest possibility. Therefore, it's instructed that the nanofluids in numerous volume fractions ought to be tested to search out the optimum volume fraction. it's additionally seen that the out there theoretical works provide totally different results on the results of particle size on the potencyofcollectors. Itâs price to hold out associate experimental work on the result of particle size on the collector potency. From the economic and environmental purpose of read, the previous studies showed that victimization nanofluidsincollectorsendsupin a discount in greenhouse emission emissions and annual electricity and fuel savings. Another reportable works of the application of the nanofluid in solar cells, solar thermal energy storage, and solar stills are reviewed. Itâs in addition stressed that for study of solar system (example cooling of solar cells), it's higher to use new thermo physical (temperature-dependent) model along with a pair of half mixture model for the nanofluid to possess a plenty of precise prediction of system performance. Finally, the foremost necessary challenges on the utilization oftheNano fluid in solar systems as well as high prices of production, instability and agglomeration issues, inflated pumping power and erosion square measure mentioned. These challenges are also reduced with the event of technology within the future. S.No I.S.T hours Inlet temperature Ti (in 0C) Outlet Temperature To (in 0C) 1 8.00 25 25 2 9.00 26 30 3 10.00 26 34 4 11.00 27 42 5 12.00 28 44 6 13.00 29 47 7 14.00 30 45
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2031 REFERENCES [1] S. M. Metev and V. P. Veiko, Laser Assisted Microtechnology, 2nd ed., R. M. Osgood, Jr., Ed. Berlin, Germany: Springer-Verlag, 1998. [2] J. Breckling, Ed., the Analysis ofDirectional TimeSeries: Applications to Wind Speed and Direction, ser. Lecture Notes in Statistics. Berlin, Germany: Springer, 1989, vol. 61. [3] S. Zhang, C. Zhu, J. K. O. Sin, and P. K. T. Mok, âA novel ultrathin elevated channel low-temperature poly-Si TFT,â IEEE Electron Device Lett., vol. 20, pp. 569â571, Nov. 1999. [4] M. Wegmuller, J. P. von der Weid, P. Oberson, and N. Gisin, âHigh resolution fiber distributedmeasurements with coherent OFDR,â in Proc. ECOCâ00, 2000, paper 11.3.4, p. 109. [5] R. E. Sorace, V. S. Reinhardt, and S. A. Vaughn, âHigh- speed digital-to-RF converter,â U.S. Patent 5 668 842, Sept. 16, 1997. [6] (2002) The IEEE website. [Online]. Available: http: www.ieee.org [7] M. Shell. (2002) IEEEtran homepageonCTAN. [Online]. Available: http: www.ctan.org tex-archive macroslatex contrib supported IEEEtran [8] FLEXChip Signal Processor (MC68175 D), Motorola, 1996. [9] âPDCA12-70 data sheet,â Opto Speed SA, Mezzovico, Switzerland. [10] A. Karnik, âPerformance of TCP congestioncontrol with rate feedback: TCP ABR and rate adaptive TCP IP,â M. Eng. thesis, Indian Instituteof Science,Bangalore,India, Jan. 1999. [11] J. Padhye, V. Firoiu, and D. Towsley, âAstochasticmodel of TCP Reno congestionavoidanceandcontrol,âUniv.of Massachusetts, Amherst, MA, CMPSCITech.Rep.99-02, 1999. [12] Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification, IEEE Std. 802.11, 1997.
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