Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Investigation of Ammonia Equipment Configurations for Supermarket Refrigeration Applications (for Microcomputers).
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher Feb 95
Year Published 1995
Report Number EPA/SW/DK-95/028;
Stock Number PB95-502555
Additional Subjects Data file ; Computer software ; Refrigerants ; Ammonia ; Environmental chemical substitutes ; Refrigerating machinery ; Computerized simulation ; Models ; Thermodynamics ; Transport properties ; Diskette ; Supermarket refrigeration
Library Call Number Additional Info Location Last
NTIS  PB95-502555 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/02/1995
Collation 1 diskette
This product 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. Project objectives were achieved by numerical experiments using simulations. Mechanistic models of refrigeration system components were used, based on fundamental principles, accepted heat transfer/pressure drop correlations, and available manufacturers' data. Available thermodynamic and transport property data correlations for ammonia and R-22 were used in the models. The parameters of these models were varied to determine their effect on system performance and locate optimum values. A modular approach was used in which each component was separately modeled, allowing simple changes in system configurations. The combined component models resulted in a large set of coupled nonlinear algebraic equations for the quasi-steady systems that did not involve brine storage. The system involved differential and algebraic equations. These equations were solved using the general-purpose simulation programs EES and TRNSYS. EES is a robust nonlinear equation-solving program with built-in thermophysical property data. TRNSYS is a sequential modular simulation program that uses schemes to solve coupled algebraic and differential equations.