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600 !nTpoints 800 !nPpoints 6000.0 !tabPmin 21000.0 !tabPmax 20.0 !tabTmin 700.0 !tabTmax number of temperature points number of pressure points table minimum pressure (kPa) table maximum pressure (kPa) table minimum temperature (C) table maximum temperature (C) Experience has shown that one of the most common errors in operating CYCLES III is forgetting to change the table limits when operating the cycle on a new fluid which requires a new pressure range. If the user should desire to add different fluids than those that are listed in HXdata.txt, the fluid files are called in the subroutine readHX. The fluid files must be located in the path: C:\Program Files\REFPROP\fluids\ or the subroutine READHX must be changed to reflect a different position. In HXdata.txt, IP: Nsec: Npipe: Dpipe: Apipe: Elpipe: xsi_pipe: rough_pipe: the pipe data appears below the heat exchanger data. It is read in as follows: Tells the code which path is being described. Don't change these. Tells the code how many sections are in that path so it can read the data correctly How many pipes are described by the data for a certain section. For example, Npipe might be 48 for the first section of IP=1. This means that the precooler will be divided into eight modules, each with six outlet plena for a total of 48 outlet plena. The number six comes from the construction of the recuperators and the number of modules is up to you (within reason of course). pipe inner diameter pipe flow area. Obviously this must be compatible with the pipe inner diameter length of the pipe The K factor describing the pipe. Inlet and outlet factors are included here, as well as bends. The roughness of the pipe. You will likely never change these values. The new user will notice that pipe areas do not always correspond to the pipe diameter in sample input files. This is due to non-circular shapes for some of the plena. The user should keep in mind that the pipe data is used to try to create a realistic model of system pressure drops, so the exact shapes of the pipes are not extremely important. Realistic pressure drops are. Each system design will require a virtually complete re-working of the pipe inputs. The user should also keep in mind the maximum dimensions of manufactured pipes, with consideration of the required thickness for high internal pressure (20.0 MPa). 133PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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