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CYCLE D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties

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CYCLE D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties NIST Technical Note 1974 CYCLE_D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties Version 1.0 User’s Guide J.S. Brown R. Brignoli P.A. Domanski This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.1974 NIST Technical Note 1974 CYCLE_D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties Version 1.0 User’s Guide J.S. Brown The Catholic University of America R. Brignoli P.A. Domanski Engineering Laboratory National Institute of Standards and Technology This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.1974 December 2017 U.S. Department of Commerce Wilbur L. Ross, Jr., Secretary National Institute of Standards and Technology Walter Copan, NIST Director and Under Secretary of Commerce for Standards and Technology This software package was developed by the National Institute of Standards and Technology (NIST), is not subject to copyright protection, and is in the public domain. It can be used freely provided that any derivative works bear some notice that they are derived from it. NIST used its best efforts to provide a high-quality software package and to select modeling methods and correlations based on sound scientific judgement. However, NIST assumes neither responsibility nor liability for any damage arising out of or relating to the use of CYCLE_D-HX. The software is provided “AS IS”; NIST makes NO GUARANTIES and NO WARRANTIES OF ANY TYPE, expressed or implied, including NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using and distributing the software and you assume all risks associated with its use, including but not limited to the risks and costs of program errors, compliance with applicable laws, damage to or loss of data, programs or equipment, and the unavailability or interruption of operation. This software is not intended to be used in any situation where a failure could cause risk of injury or damage to property. Certain commercial entities, equipment, or materials may be identified in this document to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose. National Institute of Standards and Technology Technical Note 1974 Natl. Inst. Stand. Technol. Tech. Note 1974, 42 pages (December 2017) CODEN: NTNOEF This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.1974 ABSTRACT The CYCLE_D-HX software package simulates the performance of single-component refrigerants and refrigerant blends in subcritical vapor-compression refrigeration cycles. The basic system simulated by CYCLE_D-HX consists of a compressor, discharge line, condenser, expansion device, evaporator, compressor suction line, and an optional liquid-line/suction-line heat exchanger. The other cycles may contain a second compressor, one or two economizers, or an intercooler. In contrast to simplified vapor compression cycle model, which require refrigerant saturation temperatures in the evaporator and condenser as input, CYCLE_D-HX establishes saturation temperatures in the heat exchangers using the temperatures profiles of heat source and heat sink and the mean effective temperature differences (ΔThx) in the evaporator and condenser, respectively, which are specified as input to the program. This representation of heat This publication is available f exchangers facilitates the inclusion of both thermodynamic and transport properties in cycle simulations and makes CYCLE_D-HX suitable for comparative evaluations of different refrigerants, particularly when applied in systems relying on forced-convection heat transfer of refrigerant in the heat exchangers. This software package was developed by the National Institute of Standards and Technology (NIST), is not subject to copyright protection, and is in the public domain. KEY WORDS Air conditioning; Coefficient of performance; Cycle simulation; Refrigerants; Thermodynamic properties; Transport properties; Vapor compression; Volumetric capacity. ree of charge from: https://doi.org /10.6028/NIST. TN . 1974 i TABLE OF CONTENTS TABLE OF CONTENTS ............................................................................................................................................. ii LIST OF FIGURES ................................................................................................................................................... iii LIST OF TABLES ..................................................................................................................................................... iii 1. INTRODUCTION .................................................................................................................................................. 1 2. INSTALLATION.................................................................................................................................................... 1 2.1 System Requirements .................................................................................................................................... 1 2.2 Installation Procedure .................................................................................................................................... 1 This publication is available free of charge from: 3. MODELING APPROACH ..................................................................................................................................... 1 3.1 Thermodynamic Cycle ................................................................................................................................. 1 3.2 Evaporator and Condenser ......................................................................................................................... 2 3.3 Compressor ................................................................................................................................................. 3 3.4 Economizer(s) and Intercooler..................................................................................................................... 4 3.5 Suction Line and Discharge Line ................................................................................................................. 4 3.6 Liquid-Line/Suction-Line Heat Exchanger ................................................................................................... 4 3.7 Indoor Fan, Outdoor Fan, and Controls ....................................................................................................... 4 3.8 Refrigerant Line Sizing Calculations ............................................................................................................ 4 3.9 Simulation Results ....................................................................................................................................... 5 3.10 Refrigerants and Refrigerant Properties ...................................................................................................... 6 3.11 Uncertainties of Simulation Results ............................................................................................................. 6 4. USE OF CYCLE_D-HX ........................................................................................................................................ 6 4.1 Specifying User’s Options ........................................................................................................................... 7 4.2 Entering New Input Data ............................................................................................................................. 8 4.2.1 Refrigerant Tab .................................................................................................................................. 8 4.2.2 Cycle Options Tab ........................................................................................................................... 12 4.2.3 Cycle Specifications Tab ................................................................................................................. 12 4.2.3.1 ‘Impose’ Heat Exchanger ΔThx (or UAhx) and Pressure Drop ............................................ 13 https://doi.org 4.2.3.2 ‘Impose’ Heat Exchanger ΔThx (or UAhx) and Pressure Drop with Calculation of ‘Reference Parameters’ (‘Reference’ Run) ..................................................................... 14 4.2.3.3 ‘Simulate’ Heat Exchanger ΔThx (or UAhx) and Pressure Drop .......................................... 15 4.2.3.4 Using a Compressor Map .................................................................................................. 17 4.3 Loading an Existing File with Input Data .................................................................................................... 18 4.4 Executing a Simulation Run....................................................................................................................... 18 /10.6028/NIST. 4.5 Presenting Simulation Results ................................................................................................................... 19 4.5.1 Summary Results ...........................................................................................................................
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