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WHITE PAPER 5. Technological solutions – plate heat exchangers Today’s modern plate heat exchanger technology can of- fers a wide range of possibilities to optimize performance in your application according to the demands of your choice of low-GWP refrigerant. Compared to alternative thermal technologies, plate heat exchangers provide greater heat transfer within a compact design and small- er footprint. As a result, it is possible to perform the same duties with a lower refrigerant charge. Plate technology further makes it possible to achieve a closer temperature approach at reasonable pressure drop cost. This means the plate heat exchanger technol- ogy will increase the overall system performance. When considering how to best meet the needs of synthet- ic and natural low-GWP refrigerants, there are three main types of plate heat exchanger technologies to focus on: • Copper-brazed plate heat exchangers • Semi-welded plate heat exchangers • Fusion-bonded plate heat exchangers 5.1 Copper-brazed technologies Today, there are a number of plate heat exchangers con- structed with copper brazing that have been optimized to operate with: • Carbon dioxide (CO2), especially in transcritical refrigeration systems • Hydrocarbons (mainly propane) for heating, cooling and refrigeration • Synthetic low-GWP refrigerants for heating cooling and refrigeration Copper-brazed plate heat exchangers are heat exchang- ers developed to support the largest possible number of alternative refrigerants, though they do not support am- monia. Today, it is possible to find brazed plate innova- tions that make it possible to support the highest design pressures for CO2 gas coolers (130 bar). There are also new features that enable a very low refrigerant charge asymmetric channel design for high-density and propane refrigerants. You may also be able to fully tailor the distribution system of the heat exchanger to fit your specific purposes. While this may initially seem like a small detail, it helps ensure the optimal level of efficiency for any alternative refrigerant. 12PDF Image | guide for selecting and accommodating refrigerants
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