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technical informationMoistAirTab™ Technical InformationDesignMoistAirTab uses an equation of state to compute all of the thermodynamic properties. MoistAirTab uses formulations that are approved by the American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc. (ASHRAE) as documented in the 1997 ASHRAE Handbook: Fundamentals. The equation-of-state used to compute the moist air properties are given in: ReferenceFormulations for the thermodynamic properties of the saturated phases of H2O from 173.15 K to 473.15 K, W. Hyland and A. Wexler, ASHRAE Transactions, Vol. 89, No. 2A, pp. 500-519, 1983. Formulations for the thermodynamic properties of dry air from 173.15 K to 473.15 K, and of saturated moist air from 173.15 K to 372.15 K, at pressures to 5 MPa, R. W. Hyland and A. Wexler, ASHRAE Transactions, Vol. 89, No. 2A, pp. 520-535, 1983. ImplementationThe core routines in MoistAirTab are written in C++ and compiled using Microsoft's Visual C++ into a stand-alone dynamic link library (DLL). All of the routines use double precision arithmetic (8 byte real). In addition to using standard compiler optimization techniques to speed-up calculations, MoistAirTab employs an innovative and proprietary "caching" strategy to minimize repetitive calculations. Our internal benchmarks indicate that these optimizations give a performance boost of 2 to 5 times over the un-optimized and "un-cached" versions. |
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