EN 308:1997

EN 308:1997 is a standard published by the European Committee for Standardization (CEN). Its full title is "Heat exchangers - Test procedures for establishing performance of air to air and flue gases heat recovery devices". This standard covers: This standard specifies methods to be used for laboratory testing of air-to-air heat recovery devices or those recovering heat from flue gases of heating appliances in buildings (except process-process applications) to obtain rating data. It gives test requirements and procedures for performing such tests and specifies input criteria required for tests to verify performance data given by the manufacturer. For the purposes of this standard, the term exhaust air may also be taken to mean the products of combustion. This European Standard is applicable to the following categories of heat exchangers: Category I Recuperators Category II With intermediary heat transfer medium Category IIa - without phase-change Category IIb - with phase-change (heat pipe, ...) Category III Regenerators (containing accumulating mass) Category IIIa - non hygroscopic Category IIIb - hygroscopic Heat recovery devices with exchangers and intermediary heat transfer medium without phase-change (category IIa) are to be tested as one unit including pump and pipe system between the coils. This European Standard prescribes test methods for determining: a) the external leakage; b) the internal leakage of exhaust air to the supply-air within the device at a given pressure difference between air ducts, for recovery devices of categories I and II; c) the carry-over of exhaust air to the supply air in recovery devices of category III; d) the temperature and humidity ratios; e) the pressure drop of exhaust-air and supply-air sides.

This standard specifies methods to be used for laboratory testing of air-to-air heat recovery devices or those recovering heat from flue gases of heating appliances in buildings (except process-process applications) to obtain rating data. It gives test requirements and procedures for performing such tests and specifies input criteria required for tests to verify performance data given by the manufacturer. For the purposes of this standard, the term exhaust air may also be taken to mean the products of combustion. This European Standard is applicable to the following categories of heat exchangers: Category I Recuperators Category II With intermediary heat transfer medium Category IIa - without phase-change Category IIb - with phase-change (heat pipe, ...) Category III Regenerators (containing accumulating mass) Category IIIa - non hygroscopic Category IIIb - hygroscopic Heat recovery devices with exchangers and intermediary heat transfer medium without phase-change (category IIa) are to be tested as one unit including pump and pipe system between the coils. This European Standard prescribes test methods for determining: a) the external leakage; b) the internal leakage of exhaust air to the supply-air within the device at a given pressure difference between air ducts, for recovery devices of categories I and II; c) the carry-over of exhaust air to the supply air in recovery devices of category III; d) the temperature and humidity ratios; e) the pressure drop of exhaust-air and supply-air sides.

EN 308:1997 is classified under the following ICS (International Classification for Standards) categories: 27.060.30 - Boilers and heat exchangers. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 308:1997 has the following relationships with other standards: It is inter standard links to EN 308:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 308:1997 is associated with the following European legislation: Standardization Mandates: M/BC/CEN/87/5. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.

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