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INVESTIGATION OF AMMONIA EQUIPMENT CONFIGURATIONS FOR SUPERMARKET APPLICATIONS
Citation:
McDowell, T., S. Klein, AND J. Mitchell. INVESTIGATION OF AMMONIA EQUIPMENT CONFIGURATIONS FOR SUPERMARKET APPLICATIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/028.
Description:
The report gives results of a project to quantify the advantages and disadvantages of using ammonia with a secondary brine refrigerant compared to R-22 in supermarket refrigeration applications. roject objectives were achieved by numerical experiments using simulations. echanistic models of refrigeration system components were used, based on fundamental principles, accepted heat transfer/pressure drop correlations, and available manufacturers' data. vailable thermodynamic and transport property data correlations for ammonia and R-22 were used in the models. he parameters of these models were varied to determine their effect on system performance and locate optimum values. odular approach was used in which each component was separately modeled, allowing simple changes in system configurations. he combined component models resulted in a large set of coupled nonlinear algebraic equations for the quasi-steady systems that did not involve brine storage. he system involved differential and algebraic equations. hese equations were solved using the general-purpose simulation programs EES and TRNSYS. ES is a robust nonlinear equation-solving program with built-in thermophysical property data. RNSYS is a sequential modular simulation program that uses schemes to solve coupled algebraic and differential equations.