Unsteady compressible two-phase flow model for predicting cyclic heat pump performance and a comparison with experimental data

Macarthur, J. W.; Grald, E. W.

doi:10.1016/0140-7007(89)90009-1

Cited by 111 publications

(24 citation statements)

References 2 publications

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“…Although FV models can be more accurate (MacArthur and Grald, 1989, Cullimore and Hendriks, 2001, Eborn et al, 2005and Limperich et al, 2005 than MB models, they can require up to 15 control volumes to obtain good results (Bendapudi et al, 2008). This occurs because there are much more conservation equations than in the MB approach, resulting in a lower execution speed.…”

Section: Introductionmentioning

confidence: 93%

Effect of mean void fraction correlations on a shell-and-tube evaporator dynamic model performance

Navarro-Esbrí

Milián²,

Mota-Babiloni

et al. 2015

Science and Technology for the Built Environment

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Section: Introductionmentioning

confidence: 93%

Effect of mean void fraction correlations on a shell-and-tube evaporator dynamic model performance

Navarro-Esbrí

Milián²,

Mota-Babiloni

et al. 2015

Science and Technology for the Built Environment

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“…A fully implicit formulation approach is implemented. Since the Peclet number Pe(Pe = Re.Pr, represents the ratio of the magnitude of the convection to that of conduction, of the transported quantity) is usually very large, the upwind scheme is used (MacArthur and Grald, 1989):…”

Section: Condensermentioning

confidence: 99%

“…Chi (Chi and Didion, 1982) and Murphy (Murphy et al, 1985(Murphy et al, , 1986 have developed empirical and lumped parameter transient models for heat pump. MacArthur significantly advanced the transient modelling by solving the discretized energy and continuity equations in evaporator and condenser (MacArthur and Grald, 1989), with good experimental verification of system cycling. Sami studied the transients of heat pump-assisted distillation system to show the effect of increasing the temperature lift on the efficiency of the system (Sami and Sadasivam, 1991).…”

Section: Introductionmentioning

confidence: 99%

A distributed model of a space heat pump under transient conditions

Jiang

Radermacher

2003

Int. J. Energy Res.

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SUMMARYA prototype heat pump was designed and tested, as means of active thermal management for electronics packages to be used on stratospheric balloon missions. The evaporator worked as a cold plate to absorb heat dissipated by the electronics, while the condenser rejected heat primarily by radiation to the rarified environment.To predict the transient performance of the heat pump under varying environmental temperature and cooling load conditions, a dynamic model of the heat pump is created with a graphical user interface (GUI). The simulation of the evaporator and condenser are fully transient and the components are segmented, whereas the compressor and expansion device are lumped models and assumed to be at quasisteady state. A detailed model for the mass and energy conservation in the two heat exchangers is presented. The spatial and temporal variation of temperature and mass flow rate in the heat exchangers are predicted. Several types of transient conditions such as step changes of the space temperature and cooling load, system start-up, shutdown, and cycling, are studied. The space temperature, cooling load, compressor power, mass flow rates of the compressor and expansion device, pressures and refrigerant charges of the condenser and evaporator, and temperature distribution in the heat exchangers are dynamically displayed on the GUI. The simulation results are compared with experimental data for step changes in the cooling load and show good agreement in terms of trends.

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“…Later these models were compared to experimental data [25]. In 1992 Grald and MacArthur presented a moving boundary approach model [13].…”

Section: Modeling Of Vapor Compression Systemsmentioning

confidence: 99%

Control-Oriented Modeling of Transcritical Vapor Compression Systems

Rasmussen

Alleyne

2004

Journal of Dynamic Systems, Measurement, and Control

115

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This thesis details the efforts to develop a dynamic model of a transcritical vapor compression system suitable for multivariable control design purposes. The modeling approach is described and the developed models are validated with experimental data. The models are nonlinear, independent of fluid type, and based on first principles. Linearized versions of the nonlinear models are presented. Analysis of the linearized models and empirical models created using system identification techniques suggest that lower order models are adequate for the prediction of dominant system dynamics. Singular perturbation techniques are used to justify model reduction.Based on the reduced order models, the dominant dynamics of these systems are identified and described in terms of physical phenomena. Although all results presented are for a transcritical vapor compression cycle with carbon dioxide as the working fluid, the methodology and results can be extended to both subcritical and transcritical systems.iv

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Unsteady compressible two-phase flow model for predicting cyclic heat pump performance and a comparison with experimental data

Cited by 111 publications

References 2 publications

Effect of mean void fraction correlations on a shell-and-tube evaporator dynamic model performance

Effect of mean void fraction correlations on a shell-and-tube evaporator dynamic model performance

A distributed model of a space heat pump under transient conditions

Control-Oriented Modeling of Transcritical Vapor Compression Systems

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