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Standards Development
This document defines the general terms and calculations used to determine the thermal- hydraulic performance of heat exchangers. It includes the general test procedure and related theories.
This document is intended to be used for the acceptance testing of exchangers in test facilities, such as laboratories, manufacturer's test facilities. It can also be used for the acceptance of exchangers in their final installation.
This document specifies three levels of acceptance:
- level 1 for minimum tolerances.
- level 2 for nominal tolerances.
- level 3 for maximum tolerances.
This document constitutes an application-specific standard in line with EN 305.
This porposal is based on a French document, published in 2023 to furnish test procedure for establishing the performance of specific liquid to liquid heat exchanger. The main objective is to propose this French standard at European level.
EN 305 gives general procedure to assess to the heat exchanger performance without giving any requirements to do it, especially for specific fluids like liquids. This new EN standard proposes new specifications, as the test bench (standardised installation) and experimental test acceptance criteria (time duration of the test for example), which are essential to success a HX performance test. It also gives several performance test acceptance levels to allow more flexibility on uncertainties depending on the location where the test performance is done. Some improvements are given for calculating the uncertainties of performance measurement according to international standards (JCGM). Some international standards should be referenced for the physical properties of fluids, according to IAPWS. Finally, it proposes a new methodology to transpose experimental results to reference conditions, which cannot be reached during the test. This is a key issue for the industry, as more and more heat exchanger performance tests are being carried out, particularly for sites with very strict regulations and high safety requirements.
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