A generalized pressure drop correlation for evaporation and condensation of alternative refrigerants in smooth and micro-fin tubes

Choi, Junyoung; Kedzierski, Mark A.; Domanski, Piotr A.

doi:10.6028/nist.ir.6333

Cited by 50 publications

(60 citation statements)

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“…7 shows the pressure drops of the three condensers at heat fluxes of 4.75 and 6.45 kWm À2 , a constant condensing temperature of 45°C, and a mass flux of 560 kg/(m 2 s). The theoretical pressure drops at both heat fluxes in the SC predicted by Choi et al [17] also showed as a baseline. It was seen that theoretical values presented a much similar tendency to the experimental ones but a little lower because they excluded the partial pressure drop and gravitational pressure drop.…”

Section: Average Heat Transfer Coefficientmentioning

confidence: 77%

In-tube performance evaluation of an air-cooled condenser with liquid–vapor separator

Zhong

Chen

et al. 2014

Applied Energy

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Section: Average Heat Transfer Coefficientmentioning

confidence: 77%

In-tube performance evaluation of an air-cooled condenser with liquid–vapor separator

Zhong

Chen

et al. 2014

Applied Energy

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“…Goto et al [16] developed two correlations based on their measured pressure drop data of condensation and evaporation in a helical micro-fin-tube and a herringbone micro-fin-tube with refrigerants R22 and R410A. Choi et al [17] proposed a pressure drop correlation taking the form of Pierre [12]. In the present study, frictional pressure drop in a smooth and micro-fin U-tube is obtained for wide range of condensing temperatures and mass flux.…”

Section: Introductionmentioning

confidence: 89%

Condensation pressure drop of HFC-134a and R-404A in a smooth and micro-fin U-tube

Patil

Sapali²

2011

Experimental Thermal and Fluid Science

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“…The two-phase friction factor is calculated according to Choi et al (1999). When the refrigerant is single-phase the pressure drop is given as,…”

Section: Heat Exchanger Modelingmentioning

confidence: 99%

The Impact of Modeling Complexity and Two-Phase Flow Parameters on the Accuracy of System Modeling for Unitary Air Conditioners

Harms

Braun²,

Groll

2004

HVAC&R Research

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Current air conditioner system models seek to balance the level of code complexity with the speed of execution. Ideally, the simplest code possible that can accurately predict system performance is desired. To further understand this issue, two methods of modeling unitary air conditioning systems are compared: a detailed, local approach and a simplified, global approach. These methods have been applied to two commercial unitary air conditioners from which extensive experimental data was obtained. The global approach predicted system performance as well or better than the local approach.In a separate analysis, the effects of two-phase modeling parameters on system model predictions were considered. The two-phase friction factors, heat transfer coefficients, and void fraction models were independently varied. The resulting system performance predictions were sensitive to variations in the air-side heat transfer coefficients and the void fraction model, and not as sensitive to variations in the friction factor. Both the void fraction model and the condenser parameters mainly affect the compressor discharge pressure and the compressor power consumption. The evaporator parameters mainly affect the refrigerant mass flow rate and the heat transfer rates in both heat exchangers.

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A generalized pressure drop correlation for evaporation and condensation of alternative refrigerants in smooth and micro-fin tubes

Cited by 50 publications

References 0 publications

In-tube performance evaluation of an air-cooled condenser with liquid–vapor separator

In-tube performance evaluation of an air-cooled condenser with liquid–vapor separator

Condensation pressure drop of HFC-134a and R-404A in a smooth and micro-fin U-tube

The Impact of Modeling Complexity and Two-Phase Flow Parameters on the Accuracy of System Modeling for Unitary Air Conditioners

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