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Appendix A This program was written for exhaustive search optimisation of MHE geometry within a user specified range of various geometric variables, for user specified increments. The program can also be used for calculating the performance of a single set of input variables. MHE performance is calculated in terms of total volume, number of plates required and the pressure drop. The program HXPerf.pas referred to in the comments was the original version used for calculating the performance for one input data set. This program requires a data file containing air properties at various temperatures, listed for the temperature range of interest. The properties in the data file are listed in rows; the temperature, followed by the property values at that temperature. The order of the listing in each row is: temperature, density, specific heat, viscosity, conductivity and Prandtl no.. The constant adataE in the program is defined as the number of data sets or rows. Any values required that fall between the data sets are calculated by linear interpolation. The program is in Turbo Pascal. program HXPopt2; uses crt; const adataE = 10; kCu = 386; ksp = 0.5; epsilon = lE-6; lowest = 10; type airdata = array [1..adataE] of real; {Vikas Ahuja, January 1993} {This program is a modification of HXPerf.pas} {to optimise the MHE design by trying all the} {possible combinations of surface and overall} {geometry, within limits specified by the user,} {and record the best combinations which give} {minimum 'goodness factor', a weighted} {average of HX volume, number of plates and} {pressure drop.} {Allows use of clrscr} {Number of data elements in air property data} {Thermal conductivity of screen material, W/m-K} {Thermal conductivity of spacer material, W/m-K} {Floating point error elimination} {Number of lowest values to be recorded} {Array for handling air property data} {File set up to take air properties data from} {\HUMIDAIR.TXT} {Result file} {Temperature, K} {Density, kg/cu-m} {Specific heat, kJ/kg-K} {Viscosity, Pa s X1O-6} {Thermal conductivity, mW/m-K} {Prandtl number} var dfilel : text; rfile T rho Cp mu k Pr . outlist: array [1..lowest] of array [1..10] of real; : text; : airdata; : airdata; : airdata; : airdata; : airdata; : airdata; {Output array of variables giving the lowest} {goodness factor, including results} Tbulkl : real; {Average of warm inlet and cold outlet temp., K}PDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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