Refrigerant pressure drop in chevron and bumpy style flat plate heat exchangers

Jassim, Emad W.; Newell, T.A.; Chato, J. C.

doi:10.1016/j.expthermflusci.2005.05.008

Cited by 43 publications

(13 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…8 illustrates the saturated vapour condensation frictional pressure drop against the kinetic energy per unit volume of the refrigerant flow computed by the homogeneous model: The frictional pressure drop shows a linear dependence on the kinetic energy of the refrigerant flow and therefore a quadratic dependence on the refrigerant mass flux as already found by Jassim et al (2006) in adiabatic two-phase flow of HFC-134a through a PHE. It should be noted that in the present work the kinetic energy per unit volume of the two-phase flow is computed by the homogeneous model, whereas Jassim et al (2006) have developed a specific void fraction model. The following best fitting equation has been derived from the present experimental data:…”

Section: Analysis Of the Resultsmentioning

confidence: 84%

Refrigerant R134a condensation heat transfer and pressure drop inside a small brazed plate heat exchanger

Longo

2008

International Journal of Refrigeration

View full text Add to dashboard Cite

This paper presents the experimental tests on HFC-134a condensation inside a small brazed plate heat exchanger: the effects of refrigerant mass ﬂux, saturation temperature and vapour super-heating are investigated. A transition point between gravity controlled and forced convection condensation has been found for a refrigerant mass ﬂux around 20 kg/m2 s. For refrigerant mass ﬂux lower than 20 kg/m2 s, the saturated vapour heat transfer coefﬁcients are not dependent on mass ﬂux and are well predicted by the Nusselt [Nusselt, W., 1916. Die oberﬂachenkondensation des wasserdampfes. Z. Ver. Dt. Ing. 60, 541–546, 569–575] analysis for vertical surface. For refrigerant mass ﬂux higher than 20 kg/m2 s, the saturated vapour heat transfer coefﬁcients depend on mass ﬂux and are well predicted by the Akers et al. [Akers, W.W., Deans, H.A., Crosser, O.K., 1959. Condensing heat transfer within horizontal tubes. Chem. Eng. Prog. Symp. Ser. 55, 171–176] equation. In the forced convection condensation region, the heat transfer coefﬁcients show a 30% increase for a doubling of the refrigerant mass ﬂux. The condensation heat transfer coefﬁcients of super-heated vapour are 8–10% higher than those of saturated vapour and are well predicted by the Webb [Webb, R.L., 1998. Convective condensation of superheated vapour. ASME J. Heat Transfer 120, 418–421] model. The heat transfer coefﬁcients show weak sensitivity to saturation temperature. The frictional pressure drop shows a linear dependence on the kinetic energy per unit volume of the refrigerant ﬂow and therefore a quadratic dependence on the refrigerant mass ﬂux

show abstract

Section: Analysis Of the Resultsmentioning

confidence: 84%

Refrigerant R134a condensation heat transfer and pressure drop inside a small brazed plate heat exchanger

Longo

2008

International Journal of Refrigeration

View full text Add to dashboard Cite

show abstract

“…The frictional pressure drop calculated using Eq. (13) was correlated as a function of the kinetic energy per unit volume of the flow Ke/V as shown in Longo and Gasparella [37] and Jassim et al [52]:…”

Section: Frictional Pressure Dropmentioning

confidence: 99%

Boiling heat transfer and pressure drop of ammonia-lithium nitrate solution in a plate generator

Zacarías¹,

Ventas²,

Venegas³

et al. 2010

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

“…The plates are compressed together in a rigid frame to form an arrangement of parallel flow channels with alternating hot and cold fluids. To enhance the thermal efficiency of the heat exchangers, the thermal capability of the working fluid must increase [3,4]. Addition of small amount of high thermal conductivity solid nanoparticles in base fluid increases the thermal conductivity, thus increasing the heat transfer rate in the heat exchangers [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of nanoparticles on heat transfer in mini double-pipe heat exchangers in turbulent flow

et al. 2014

View full text Add to dashboard Cite

In this work, heat transfer of a fluid containing nanoparticles of aluminum oxide with the water volume fraction (0.1-0.3) percent has been reported. Heat transfer of the fluid containing nano water aluminum oxide with a diameter of about 20 nm in a horizontal double pipe counter flow heat exchanger under turbulent flow conditions was studied. The results showed that the heat transfer of nanofluid in comparison with the heat transfer of fluid is slightly higher than 12 percent.

show abstract

Refrigerant pressure drop in chevron and bumpy style flat plate heat exchangers

Cited by 43 publications

References 5 publications

Refrigerant R134a condensation heat transfer and pressure drop inside a small brazed plate heat exchanger

Refrigerant R134a condensation heat transfer and pressure drop inside a small brazed plate heat exchanger

Boiling heat transfer and pressure drop of ammonia-lithium nitrate solution in a plate generator

Effect of nanoparticles on heat transfer in mini double-pipe heat exchangers in turbulent flow

Contact Info

Product

Resources

About