Detailed comparison of the performance of flat-plate and vacuum tube solar collectors for domestic hot water heating

The performance of a DHW system fitted with flat-plate and vacuum collectors has been analysed. Simulations were carried out on the basis of equal aperture or gross areas of basis using TMY data for hour-by-hour dynamic simulation generated for 1036 sites located in different regions of the world. The performance indicators of solar fractions and number of days were determined for specific water mean temperatures in the storage tank of 37 °C, 45 °C and 55 °C. It has been shown that vacuum tube collectors provide slightly better DHW performance indicators than typical flat-plate collectors having the same aperture area. However, since the space that needs to be provided and directly or indirectly paid for is what matters to the user of solar heating systems, the analysis was also carried out on equal gross area basis; on this basis, the advantages of using vacuum collectors are not obvious.

[1]  李旭光,et al.  All-glass evacuated solar collector tube , 2009 .

[2]  Wilfried Zörner,et al.  Performance of Vacuum Tube and Flat Plate Collectors Con- cerning Domestic Hot Water Preparation and Room Heating , 2005 .

[3]  C. Estrada-Gasca,et al.  Theoretical analysis of the thermal performance of all-glass evacuated tube solar collectors with absorber coating on the outside or inside of the inner tube , 1992 .

[4]  T. Akomolafe,et al.  The influence of construction parameters on the performance of a low cost flat-plate collector , 1991 .

[5]  Zhimin Li,et al.  Assessment of uncertainty in mean heat loss coefficient of all glass evacuated solar collector tube testing , 2006 .

[6]  Ram Chandra,et al.  Performance comparison of two-pass modified reverse flat-plate collector with conventional flat-plate collectors , 1983 .

[7]  Brian Norton,et al.  Geographic Variation of Solar Water Heater Performance in Europe , 2006 .

[8]  Simon Furbo,et al.  Theoretical variations of the thermal performance of different solar collectors and solar combi systems as function of the varying yearly weather conditions in Denmark , 2009 .

[9]  Simon Furbo,et al.  Vertical evacuated tubular-collectors utilizing solar radiation from all directions , 2004 .

[10]  Sanford Klein,et al.  Calculation of flat-plate collector utilizability , 1978 .

[11]  Shahab Sokhansanj,et al.  A dynamic performance simulation model of flat-plate solar collectors for a heat pump system , 1993 .

[12]  He Zinian,et al.  A comparison of optical performance between evacuated collector tubes with flat and semicylindric absorbers , 1997 .

[13]  G. N. Tiwari,et al.  Transient performance of normal/reverse flat plate collector with selective absorber surface , 1983 .

[14]  김성일,et al.  순환 유동층 보일러의 동적 성능 모사 = Dynamic performance simulation , 2014 .

[15]  Kamran Siddiqui,et al.  Experimental study on the effect of heat transfer enhancement devices in flat-plate solar collectors , 2009 .

[16]  S. Klein,et al.  Analysis of solar domestic hot water heaters , 1980 .

[17]  Brian Norton,et al.  The Annual Number of Days that Solar Heated Water Satisfies a Specified Demand Temperature , 2006 .

[18]  Björn Karlsson,et al.  The impact of optical and thermal properties on the performance of flat plate solar collectors , 2000 .

[19]  Xing Zhang,et al.  An experimental study on evacuated tube solar collector using supercritical CO2 , 2008 .

[20]  Ali M. El-Nashar,et al.  Effect of dust deposition on the performance of a solar desalination plant operating in an arid desert area , 2003 .

[21]  Ali M. El-Nashar,et al.  The effect of dust accumulation on the performance of evacuated tube collectors , 1994 .

[22]  W. Beckman,et al.  A general design method for closed-loop solar energy systems , 1977 .

[23]  W. Beckman,et al.  Solar Engineering of Thermal Processes , 1985 .

[24]  S. R. Dhariwal,et al.  Analytical expressions for the response of flat-plate collector to various transient conditions , 2005 .

[25]  A. Georgiev,et al.  Simulation and experimental results of a vacuum solar collector system with storage , 2005 .

[26]  Ashvini Kumar,et al.  Thermal performance of flat-plate solar collectors manufactured in India , 1991 .

[27]  Aman Dang,et al.  Performance of flat plate solar collectors in off-south orientation in India , 1983 .

[28]  Douglas T. Reindl,et al.  Thermal performance testing of flat-plate collectors , 2008 .

[29]  W. Heidemann,et al.  Comparison Test of Thermal Solar Systems for Domestic Hot Water Preparation and Space Heating , 2004 .

[30]  Yong Kim,et al.  Thermal performances comparisons of the glass evacuated tube solar collectors with shapes of absorber tube , 2007 .