Simulation of the parabolic trough solar energy generation system with Organic Rankine Cycle

A model for a typical parabolic trough solar thermal power generation system with Organic Rankine Cycle (PT-SEGS–ORC) was built within the transient energy simulation package TRNSYS, which is formed by integrating several submodels for the trough collector system, the single-tank thermal storage system, the auxiliary power system and the heat-electricity conversion system. With this model, the effects of several key parameters, including the interlayer pressure between the absorber tube and the glass tube (pinter), the flow rate of high temperature oil in the absorber tube (v), solar radiation intensity (Idn) and incidence angle (θ), on the performance of the parabolic trough collector field based on the meteorological data of Xi’an city were examined. The study shows that the heat loss of the solar collector (qloss) increases sharply with the increase in pinter at beginning and then reaches to an approximately constant value. The variation of heat collecting efficiency (ηhc) with v is quite similar to the variation of qloss with pinter. However, Idn and θ exhibit opposite effect on ηhc. In addition, it is found that the optimal volume of the thermal storage system is sensitively dependent on the solar radiation intensity. The optimal volumes are 100, 150, 50, and 0m3 for spring equinox, summer solstice, autumnal equinox and winter solstice, respectively.

[1]  D. L. Larson.  Final report of the Coolidge solar irrigation project , 1983 .

[2]  H. Price,et al.  Modular Trough Power Plant Cycle and Systems Analysis , 2002 .

[3]  D. Mills.  Advances in solar thermal electricity technology , 2004 .

[4]  D. Kearney,et al.  Test results: SEGS LS-2 solar collector , 1994 .

[5]  Soteris A. Kalogirou,et al.  Modelling, optimisation and performance evaluation of a parabolic trough solar collector steam generation system , 1997 .

[6]  A. Thomas,et al.  Solar steam generating systems using parabolic trough concentrators , 1996 .

[7]  F. Lippke,et al.  Simulation of the part-load behavior of a 30 MWe SEGS plant , 1995 .

[8]  Jing Li,et al.  Analysis of low temperature solar thermal electric generation using regenerative Organic Rankine Cycle , 2010 .

[9]  Li Zhao,et al.  A review of working fluid and expander selections for organic Rankine cycle , 2013 .

[10]  Markus Eck,et al.  Direct steam generation in parabolic troughs: Final results and conclusions of the DISS project , 2004 .

[11]  Alvaro Lentz,et al.  Electricity production at low powers by direct steam generation with parabolic troughs , 1998 .

[12]  J. Pacheco,et al.  DEVELOPMENT OF A MOLTEN-SALT THERMOCLINE THERMAL STORAGE SYSTEM FOR PARABOLIC TROUGH PLANTS , 2001 .

[13]  S. C. Kaushik,et al.  Exergetic analysis of a solar thermal power system , 2000 .

[14]  E. Prabhu,et al.  Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics; November 2000 -- May 2005 , 2006 .

[15]  A. C. Ratzel,et al.  Techniques for reducing thermal conduction and natural convection heat losses in annular receiver geometries , 1979 .

[16]  Theocharis Tsoutsos,et al.  Technical and economical evaluation of solar thermal power generation , 2003 .

[17]  M. Behnia,et al.  Modelling of Parabolic Trough Direct Steam Generation Solar Collectors , 1998, Renewable Energy.