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Currently, pillow-plate heat exchangers (PPHE) enjoy growing attention and become increasingly employed in various branches of industry. The ongoing expansion of the PPHE exploitation area generates a need for new structural requirements for this type of equipment. In this regard, the flow configuration in PPHE is crucial for key aspects like energy efficiency, operating costs and functionality. Whereas in conventional PPHE the flow can be redirected by baffles made of welding lines in the inner pillow-plate channels, there is no method to improve the flow configuration in the outer channels.
For this reason, a new PPHE was developed in the group of Professor Kenig at the University of Paderborn, which enables the flow redirection also in the outer channels. This provides an optimized flow configuration in the entire heat exchanger and can be customized according to the specific application. The new flow configuration is achieved by implementing various baffle elements within the pillow-plate stack, which offers the possibility of multiplied flow redirection either in the inner channels only, or in the outer channels only, or on both sides simultaneously, depending on the application. The advantages of this construction are the optimized flow configuration (e.g. ideal counter-current flow), the increase of the mean stream velocity (e.g. important in applications with gases) in both channels leading to heat transfer enhancement, as well as a facilitated flow distribution among the outer channels at the inlet of the PPHE. The modified design is simple in assembling and can be easily implemented into existing manufacturing processes.
Keywords: Wärmeübertragung, Kissenplatten-Wärmeübertrager, Thermoblech-Wärmeübertrager, Heat Transfer, Pillow-Plate Heat Exchanger
The proposed invention helps to increase heat transfer rates in PPHE, to improve energy efficiency and to reduce operating costs. Such heat exchangers can be used in various industrial areas.
Some example applications are:
A German patent application is pending, international applications are possible. On behalf of the University of Paderborn, PROvendis offer licenses to interested companies.