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Parabolic Trough Solar System Piping Model Final Report NREL Contract No. AAA-2-32432-01 The flow rate in the East-West cold header for this example is 229 kg/sec, and is calculated as follows: 234,700,000 J sec (H_Therminol 393 C − H_Therminol 288 C , J/kg) (4) where 234,700,000 J/sec is the thermal rating of the collector field, and the ‘4’ repre- sents one-fourth of the collector field. The flow rate in the standard collector loop is 6.4 kg/sec, or 1/36th of the flow in the section header. The flow rate in the third header section is 217 kg/sec [229 kg/sec - (2)(6.4 kg/sec) for the two standard collector loops fed by this section]. The balance of the cold header and hot header section flow rates are calculated in a similar fashion. ‘I’ Field Layout An example of a possible ‘I’ field piping layout for a representative 30 MWe plant has been developed, as follows: • The field is divided into 2 header-pair sections, with the power block located at the center of the field. • Acoldoilheader,inparallelwithahotoilheader,runsEast-Westthroughthe center of the section. • Each collector loop consists of 16 LS-2 solar collector assemblies, with the flow going out from the cold header through 8 assemblies, reversing direction, and then returning to the hot header through the remaining 8 assemblies. A total of 22 loops is supplied from the two headers. The arrangement is illustrated in Figure 2. The flow rate in the cold header for this example is 172 kg/sec, and is calculated as follows: [1] 88,000,000 J sec (H_Therminol 393 C − H_Therminol 288 C , J/kg) (2) [2] where 88,000,000 J/sec is the collector field thermal rating, and the ‘2’ represents one- half of the collector field. The flow rate in the standard collector loop is 7.8 kg/sec, or 1/22nd of the flow in the quadrant header. The flow rate in the third header section is 156 kg/sec [172 kg/sec - (2)(7.8 kg/sec) for the two standard collector loops fed by this section]. The balance of the cold header and hot header section flow rates are calculated in a similar manner. - 7 - September 15, 2002PDF Image | Parabolic Trough Solar System Piping Model
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