BS EN 308:1997

Heat exchangers. Test procedures for establishing the performance of air to air and flue gases heat recovery devices. | Status: Superseded, Withdrawn

1 Scope This European 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 intended to be used as a basis for testing heat recovery devices for HVAC systems, which as specified in prEN 247 consist of the heat exchanger itself installed in a casing having the necessary air duct connecting elements and in some cases the fans and pumps, but without any additional components of the HVAC system. 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 II1a: non hygroscopic Category II1b: 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:

1. a) the external leakage;
2. 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;
3. c) the carry-over of exhaust air to the supply air in recovery devices of category III;
4. d) the temperature and humidity ratios;
5. e) the pressure drop of exhaust air and supply air sides.