In this paper, a solar water heater using supercritical carbon dioxide as working fluid is proposed and experimentally studied. For supercritical carbon dioxide, a small change in temperature or pressure can result in large change in density, especially in the state close to the critical point. Thus, natural convective flow of the supercritical carbon dioxide can be easily induced by solar heating or water cooling. Such convective flow absorbs and transports heat to water in solar collector tubes. Motivated by the above idea, an experimental setup was designed, and a solar water heater was tested. The obtained results show that natural convective flow is well induced, and a flow of 1900 Reynolds number can be achieved even in winter, when the lowest level of solar radiation condition occurs. Furthermore, the measured collector and heat recovery efficiencies are 66.0% and 65.0%, respectively. More details of its mechanism are to be studied, and a complete performance analysis is needed.
1.
Davidson
, J. H.
, Mantell
, S. C.
, and Jorgensen
, G.
, 2002, “Status of the Development of Polymeric Solar Water Heating Systems
,” Advances in Solar Energy
, D. Y.
Goswami
, ed., American Solar Energy Society
, Boulder
, Vol. 15
, pp. 149
–186
.2.
Chen
, G.
, Dresselhaus
, M. S.
, Fleurial
, J. -P.
, and Caillat
, T.
, 2003, “Recent Developments in Thermoelectric Materials
,” Int. Mater. Rev.
0950-6608, 48
, pp. 45
–66
.3.
Greffet
, J. J.
, Carminati
, R.
, Joulain
, K.
, Mulet
, J. P.
, Mainguy
, S.
, and Chen
, Y.
, 2002, “Coherent Emission of Light by Thermal Sources
,” Nature (London)
0028-0836, 416
, pp. 61
–64
.4.
Mancini
, T.
, Heller
, P.
, Butler
, B.
, Osborn
, B.
, Wolfgang
, S.
, Vernon
, G.
, Buck
, R.
, Diver
, R.
, Andraka
, C.
, and Moreno
, J.
, 2003, “Dish-Stirling Systems: An Overview of Development and Status
,” ASME J. Sol. Energy Eng.
0199-6231, 125
, pp. 135
–151
.5.
Kalogirou
, S. A.
, 2004, “Solar Thermal Collectors and Applications
,” Prog. Energy Combust. Sci.
0360-1285, 30
(3
), pp. 231
–295
.6.
Budihardjo
, I.
, and Morrison
, G. L.
, 2009, “Performance of Water-in-Glass Evacuated Tube Solar Water Heaters
,” Sol. Energy
0038-092X, 83
(1
), pp. 49
–56
.7.
Dubey
, S.
, and Tiwari
, G. N.
, 2008, “Thermal Modeling of a Combined System of Photovoltaic Thermal (PV/T) Solar Water Heater
,” Sol. Energy
0038-092X, 82
(7
), pp. 602
–612
.8.
Anderson
, T. N.
, and Morrison
, G. L.
, 2007, “Effect of Load Pattern on Solar-Boosted Heat Pump Water Heater Performance
,” Sol. Energy
0038-092X, 81
(11
), pp. 1386
–1395
.9.
Esen
, M.
, and Esen
, H.
, 2005, “Experimental Investigation of a Two-Phase Closed Thermosyphon Solar Water Heater
,” Sol. Energy
0038-092X, 79
(5
), pp. 459
–468
.10.
Morrison
, G. L.
, Budihardjo
, I.
, and Behnia
, M.
, 2005, “Measurement and Simulation of Flow Rate in a Water-in-Glass Evacuated Tube Solar Water Heater
,” Sol. Energy
0038-092X, 78
(2
), pp. 257
–267
.11.
Morrison
, G. L.
, Budihardjo
, I.
, and Behnia
, M.
, 2004, “Water-in-Glass Evacuated Tube Solar Water Heaters
,” Sol. Energy
0038-092X, 76
(1–3
), pp. 135
–140
.12.
Dahl
, S. D.
, and Davidson
, J. H.
, 1997, “Performance and Modeling of Thermosyphon Heat Exchangers for Solar Water Heaters
,” ASME J. Sol. Energy Eng.
0199-6231, 119
(3
), pp. 193
–200
.13.
Mason
, A. A.
, and Davidson
, J. H.
, 1995, “Measured Performance and Modeling of an Evacuated-Tube, Integral-Collector-Storage Solar Water Heater
,” ASME J. Sol. Energy Eng.
0199-6231, 117
(3
), pp. 221
–228
.14.
Rosengarten
, G.
, Morrison
, G.
, and Behnia
, M.
, 1999, “A Second Law Approach to Characterising Thermally Stratified Hot Water Storage With Application to Solar Water Heaters
,” ASME J. Sol. Energy Eng.
0199-6231, 121
(4
), pp. 194
–200
.15.
Lorentzen
, G.
, 1990, “Trans-Critical Vapour Compression Cycle Device
,” International Patent Publication, Patent No. WO 90/07683.16.
Lorentzen
, G.
, and Pettersen
, J.
, 1992, “New Possibilities for Non-CFC Refrigeration
,” Proceedings of the IIR International Symposium on Refrigeration, Energy and Environment
, Trondheim, Norway, pp. 147
–163
.17.
Hashimoto
, K.
, and Saikawa
, M.
, 2004, “Trend Report of Development of Residential CO2 Heat Pump Hot Water Heater in Japan
,” Proceedings for the JSME Ninth Power Energy Technical Symposium
, pp. 425
–430
.18.
Kim
, M. H.
, Pettersen
, J.
, and Bullard
, C. W.
, 2004, “Fundamental Process and System Design Issues in CO2 Vapor Compression Systems
,” Prog. Energy Combust. Sci.
0360-1285, 30
, pp. 119
–174
.19.
Nekså
, P.
, Rekstad
, H.
, Zakeri
, G. R.
, and Schiefloe
, P. A.
, 1998, “CO2-Heat Pump Water Heater: Characteristics, System Design and Experimental Results
,” Int. J. Refrig.
0140-7007, 21
, pp. 172
–179
.20.
Nekså
, P.
, 2002, “CO2 Heat Pump Systems
,” Int. J. Refrig.
0140-7007, 25
, pp. 421
–427
.21.
Stene
, J.
, 2005, “Residential CO2 Heat Pump System for Combined Space Heating and Hot Water Heating
,” Int. J. Refrig.
0140-7007, 28
, pp. 1259
–1265
.22.
Zhang
, X. R.
, Yamaguchi
, H.
, Fujima
, K.
, Enomoto
, M.
, and Sawada
, N.
, 2005, “A Feasibility Study of CO2-Based Rankine Cycle Powered by Solar Energy
,” JSME Int. J., Ser. B
1340-8054, 48
, pp. 540
–547
.23.
Zhang
, X. R.
, Yamaguchi
, H.
, Uneno
, D.
, Fujima
, K.
, Enomoto
, M.
, and Sawada
, N.
, 2006, “Analysis of a Novel Solar Energy Powered Rankine Cycle for Combined Power and Heat Generation Using Supercritical Carbon Dioxide
,” Renewable Energy
0960-1481, 31
, pp. 1839
–1854
.24.
Zhang
, X. R.
, Yamaguchi
, H.
, and Uneno
, D.
, 2007, “Experimental Study on the Performance of Solar Rankine System Using Supercritical CO2
,” Renewable Energy
0960-1481, 32
, pp. 2617
–2628
.25.
Zhang
, X. R.
, and Yamaguchi
, H.
, 2008, “An Experimental Study on Evacuated Tube Solar Collector Using Supercritical CO2
,” Appl. Therm. Eng.
1359-4311, 28
, pp. 1225
–1233
.26.
Zhang
, X. R.
, and Yamaguchi
, H.
, 2007, “Forced Convection Heat Transfer of Supercritical Carbon Dioxide in a Horizontal Circular Tube
,” J. Supercrit. Fluids
0896-8446, 41
, pp. 412
–420
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