CYCLE_D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties; Version 2, User's Guide

Published

January 19, 2021

Author(s)

J S. Brown, Riccardo Brignoli, Piotr A. Domanski, Young J. Yoon

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. All properties are calculated using the NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties - REFPROP, Version 10.0 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 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. All properties are calculated using the N

Citation

Technical Note (NIST TN) - 2134

Report Number

2134

NIST Pub Series

Technical Note (NIST TN)

Pub Type

NIST Pubs

Download Paper

DOI Link

Keywords

Air conditioning, Coefficient of performance, Cycle simulation, Refrigerants, Thermodynamic properties, Transport properties, Vapor compression, Volumetric capacity.

Citation

Brown, J. , Brignoli, R. , Domanski, P. and Yoon, Y. (2021), CYCLE_D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties; Version 2, User's Guide, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.TN.2134 (Accessed April 24, 2024)