A generalized friction correlation for louver fin geometry

Chang, Yu; Hsu, Kuei Chang; Lin, Yur Tsai; Wang, Chi-Chuan

doi:10.1016/s0017-9310(99)00289-6

Cited by 151 publications

(87 citation statements)

References 4 publications

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“…7.53 of [10]. For air-side heat exchange on the finned heat exchangers, the Chang correlation [13] was implemented. It is noted that although the Chang correlation did not incorporate the effects of humidity and condensation, we still apply this correlation for moist air.…”

Section: Air-side Equationsmentioning

confidence: 99%

A New Automotive Air Conditioning System Simulation Tool Developed in MATLAB/Simulink

Kiss¹,

Chaney²,

Meyer³

2013

SAE Int. J. Passeng. Cars - Mech. Syst.

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Accurate evaluation of vehicles' transient total power requirement helps achieving further improvements in vehicle fuel efficiency. When operated, the air-conditioning (A/C) system is the largest auxiliary load on a vehicle, therefore accurate evaluation of the load it places on the vehicle's engine and/or energy storage system is especially important. Vehicle simulation models, such as "Autonomie", have been used by OEMs to evaluate vehicles' energy performance. However, the load from the A/C system on the engine or on the energy storage system has not always been modeled in sufficient detail. A transient A/C simulation tool incorporated into vehicle simulation models would also provide a tool for developing more efficient A/C systems through a thorough consideration of the transient A/C system performance. The dynamic system simulation software MATLAB/Simulink® is frequently used by vehicle controls engineers to develop new and more efficient vehicle energy system controls. A MATLAB/Simulink-based transient A/C system simulation model is easier to incorporate into MATLAB/Simulink-based vehicle simulation software; therefore, the availability of a transient A/C system simulation tool developed in the MATLAB/Simulink platform is important.NREL has recently developed an A/C simulation tool to address these needs. This paper describes in detail the modeling methods used for this new simulation tool. Comparison with measured data is provided to demonstrate the validity of the model. The agreement between simulation and measurement was shown to be good on both the component and system level. The capabilities of the model are also demonstrated by the example of simulating the SC03 cycle.

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Section: Air-side Equationsmentioning

confidence: 99%

A New Automotive Air Conditioning System Simulation Tool Developed in MATLAB/Simulink

Kiss¹,

Chaney²,

Meyer³

2013

SAE Int. J. Passeng. Cars - Mech. Syst.

View full text Add to dashboard Cite

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“…The air-side heat transfer correlation selected for the model was proposed by Chang and Wang (1997). It was selected because it covered the widest array of geometry's and is one of the most recently published louvered fin airside heat transfer coefficient correlations.…”

Section: Simulation Modelmentioning

confidence: 99%

R-744 gas cooler model development and validation

Yin

Bullard

Hrnjak

2001

International Journal of Refrigeration

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AJirst principles-based model was developed for a transcritical C02 gas cooler, using a finite element method. The model uses published correlations for refrigerant and airside heat transfer and pressure drop. Experimental results are presented at 48 operating conditions. The model predicted the gas cooler capacity within ±2% and pressure drop on the R744 side well within the range of experimental error. The model's usefulness is demonstrated by analyzing alternative circuiting and multi-slab designs.

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“…Mass flow rate, temperature, and the relative humidity of the incoming wet air for each pipe segment are input variables. The air-side heat transfer equations are solved for each segment of the pipe using the Chang local heat transfer coefficient correlations [12]. The effectiveness-NTU (E-NTU) method [13] is applied on each segment, which ensures that the exit air temperature does not overshoot the wall temperature.…”

Section: Fully-detailed Model Summarymentioning

confidence: 99%

“…Two versions of the 1-D pipe model simulation block described above, with air-side heat transfer according to Chang's model [12], are the basic building blocks for the heat exchangers in the A/C system model. To model the tubes of the condenser, a version employing the Dittus-Boelter equation [13] is used on the refrigerant side along the full length of the pass, even across the phase boundaries.…”

Section: Heat Exchangersmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of the Accuracy and Speed of Transient Mobile A/C System Simulation Models

Kiss

Lustbader

2014

SAE Int. J. Passeng. Cars - Mech. Syst.

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The operation of air conditioning (A/C) systems is a significant contributor to the total amount of fuel used by light-and heavy-duty vehicles. Therefore, continued improvement of the efficiency of these mobile A/C systems is important. Numerical simulation has been used to reduce the system development time and to improve the electronic controls, but numerical models that include highly detailed physics run slower than desired for carrying out vehicle-focused drive cycle-based system optimization. Therefore, faster models are needed even if some accuracy is sacrificed.In this study, a validated model with highly detailed physics, the "Fully-Detailed" model, and two models with different levels of simplification, the "Quasi-Transient" and the "Mapped

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A generalized friction correlation for louver fin geometry

Cited by 151 publications

References 4 publications

A New Automotive Air Conditioning System Simulation Tool Developed in MATLAB/Simulink

A New Automotive Air Conditioning System Simulation Tool Developed in MATLAB/Simulink

R-744 gas cooler model development and validation

Comparison of the Accuracy and Speed of Transient Mobile A/C System Simulation Models

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