A new model for refrigerant boiling inside Brazed Plate Heat Exchangers (BPHEs)

2015 ◽  
Vol 91 ◽  
pp. 144-149 ◽  
Author(s):  
Giovanni A. Longo ◽  
Simone Mancin ◽  
Giulia Righetti ◽  
Claudio Zilio
Keyword(s):  
Heat Exchangers ◽  
Plate Heat ◽  
New Model ◽  
Brazed Plate Heat Exchangers

Liquid Metal Embrittlement of Copper Brazed Plate Heat Exchangers

2019 ◽  
Vol 809 ◽  
pp. 535-540
Author(s):  
Roland Haubner ◽  
Susanne Strobl ◽  
Lorenz Pinkas Bichler ◽  
Paul Linhardt
Keyword(s):  
Liquid Metal ◽  
Heat Exchangers ◽  
Pure Copper ◽  
Industrial Applications ◽  
Liquid Metal Embrittlement ◽  
Plate Heat ◽  
Electrochemical Tests ◽  
Heating And Cooling ◽  
Micro Analysis ◽  
Brazed Plate Heat Exchangers

Plate heat exchangers are widely used for heating and cooling activities in domestic and industrial applications. The plates of all these components were made of stainless steel (e.g. type X2 CrNiMo 17-12-2) and they were brazed with pure copper. After cutting and metallographic preparation, the samples were investigated by light optical microscopy (LOM) to measure the depth of copper penetration into the plates (liquid metal embrittlement (LME)). For seven heat exchangers the penetration depth was between 25 and 60 μm, but for one the depth was about 150 μm. At the steel-copper interfaces an additional phase was identified as chromium-rich ferrite by electron beam micro analysis (EBMA). To get information about the sensitivity against corrosion electrochemical tests were performed in two electrolytes (HCO3- + SO42- and HCO3- + SO42- + Cl-). It can be summarized that in the Cl- free electrolyte the copper was attacked mainly. In case of the Cl- containing electrolyte beside the copper braze, the LME zones in the steel were corroded additionally.

Thermo-Hydrodynamic of the Evaporation of Refrigerant R134A in Brazed Plate Heat Exchangers

Volume 3 ◽  
2004 ◽  
Author(s):  
Amir Jokar ◽  
Steven J. Eckels ◽  
Mohammad H. Hosni
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Single Phase ◽  
Flow Analysis ◽  
Phase Flow ◽  
Water Mixture ◽  
Transfer Coefficients ◽  
Plate Heat ◽  
Evaporation Heat ◽  
Brazed Plate Heat Exchangers

The evaporation of refrigerant R134a in three different sizes of Brazed Plate Heat Exchangers (BPHE) is analyzed in this article. The BPHEs are a type of compact plate heat exchanger with parallel corrugated plates which are brazed together in series. In this study, these heat exchangers are utilized as the evaporator of an automotive refrigeration system, and their heat transfer coefficients and pressure drops are obtained experimentally. The refrigerant flows on one side and a 50% glycol-water mixture on the other side of the BPHEs, in a counter flow configuration. The heat transfer coefficient for the single-phase glycol-water mixture flow through the BPHEs is obtained using the Wilson plot technique. The single-phase Fanning friction factor correlation is also obtained using experimental results from the hydrodynamic parameters of glycol-water mixture. The results from the single-phase flow analysis are then extended to the two-phase flow analysis to correlate the evaporation heat transfer and pressure drop for the refrigerant R134a in the BPHEs. In summary, the thermo-hydrodynamic behavior of the evaporation of R143a in brazed plate heat exchangers is analyzed and compared with previous studies.

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