Measured/calculated parameter Organisation Reference/Title Notes

SEC — Specific Energy Consumption for ventilation per m2 heated floor area of a dwelling or building [kWh/(m2.a)] European Commission Commission Regulation (EU) No 1253/2014 Annex VIII Commission Regulation (EU) No 1254/2014 Annex VIII There are no standards describing SEC, but the equation is given in Regulation 1253/2014 and in Regulation 1254/2014.

Specific power input (SPI) CEN (European Committee for Standardization) EN 13142 and the EN 13141-series acc. to product type The calculation of SPI is described in EN 13142: 2013 for BVUs and the test method for measured values is described in the EN 13141-series regarding type of unit. For UVUs the same definition and method can be used. However, it must be measured and calculated according to the reference flow and pressure described in Regulation 1253/2014. In Annex I (13) to Regulation 1253/2014, SPI is expressed in W/m3/h, and in Annex VIII to Regulation 1253/2014, SPI is expressed in kW/m3/h. As information requirement, SPI must be set out in W/m3/h. For the calculation of SEC, SPI must be in kW/m3/h.

Effective (total) power input CEN EN 13141-series acc. to product type supplemented by EN ISO 5801 EN 13141-7 and 13141-6 refer to EN 13141-4 (6.1) which refers to EN ISO 5801 (Chapter 10, Power input). The definition in the standards is ‘power input’ or ‘total power input’ and not ‘effective power input’ as in Regulation 1253/2014. EN 13141-8 has no description of method or reference and lacks requirements for measurement uncertainty. BVUs: To be measured summarized for both fans and control equipment. The electric power consumption for auxiliaries is to be included e.g. BVUs with rotating HRS also include rotor motor.

External total pressure difference CEN EN 13141-series acc. to product type supplemented by EN ISO 5801 For ducted units to be measured in connected ducts in order that the consumers receive consistent pressure and flow values. External total pressure difference is, according to Regulation 1253/2014, the static pressure difference for ducted RVUs and the total pressure difference for non-ducted RVUs between inlet and outlet, for BVUs both airflows (if not equal, refer to supply). To which connection the pressure is delivered is not described in Regulation 1253/2014. The distribution is optional but it is suggested that for ducted RVUs to be distributed with 1/3 of the external total pressure difference on the outside (EHA and ODA) and 2/3 of the external total pressure difference (ETA and SUP) at the building side according to the EN 13141-series. For further description, see Chapter 3 of this document and DTI's document ‘Transitional method for determination of internal specific fan power of ventilation units, SFPint’ (2) BVUs The test is described in EN 13141-7 (6.2.2), which foresees that the test must be conducted in all 4 ducts. EN 13141-7 refers to EN 13141-4 (5.2.2) in which the installation of the ducts is defined. UVUs (exhaust) Not described in EN 13141-6. Use EN ISO 5801 or EN 13141-4. BVUs (single room non-ducted) Overall description in EN 13141-8, Section 5.2.3 (and Annex A), which refers to EN 13141-4 and EN ISO 5801. UVUs (supply systems) The test is described in EN 13141-11 (6), which refers to EN 13141-4 and EN ISO 5801 How the pressure is measured in the duct (measurement ducts)/chamber and the permissible deviation is not described in all standards. This must be designed and tested according to EN ISO 5801.

Reference flow rate CEN EN 13141-series acc. to product type supplemented by EN ISO 5801 The standards do not describe the reference or maximum flow and pressure. Nor do they describe how to achieve these according to Regulation 1253/2014. They only describe how to measure the flow according to the design of the individual units (except EN 13141-8 regarding flow and EN 13141-11 regarding pressure). Se description in Chapter 3 of this document on how to declare reference flow rate for ducted units. A method is also specified for the case, where a unit is not capable of achieving a pressure at 100 Pa but is capable of achieving 50 Pa. The reference flow rate cannot be higher than the maximum flow rate. BVUs The test setup is described in EN 13141-7 (6.2.2). EN 13141-7 refers to EN 13141-4 (5.2.2) in which the installation of the ducts is defined. For BVUs; if the test is conducted with a numerical unbalanced airflow SUP-SIDE in relation to the EHA-SIDE it should be noted in the test report. For BVUs, the flow rate applies to the air supply outlet. UVUs (exhaust) Overall, the test setup is described in EN 13141-4/6. EN 13141-6 refers to airflow measurements according to ISO 5221 (which is withdrawn since 1984). EN ISO 5801 can be used instead. UVUs and BVUs (single room non-ducted) Overall description in EN 13141-8 (3.1.9). Method in accordance with EN 13141-4 Section 5.2.3 and EN ISO 5801. UVUs (supply systems) The test is described in EN 13141-11 (3.6). Method description (6) refers to EN 13141-4 and EN ISO 5801.

Flow rate/pressure diagram CEN EN 13141-4 EN 13141-7 supplemented by EN ISO 5801 EN 13141-7 refers to BVUs but the method can also be applied to other products. EN ISO 5801 refers to fans, but the method can also be applied to other products.

Maximum flow rate CEN EN 13141-series acc. to product type supplemented by EN ISO 5801 For all products, see reference flow

Thermal Efficiency, ηt CEN EN 13141-7 and EN ISO 5801 EN 13141-8 and EN ISO 5801 Thermal efficiency can normally be measured according to EN 308 or EN 13141-7, EN 13141-8 and ISO 16494 for equal mass flows in-out and without condensation. However, Regulation 1253/2014 states that the temperature difference between in and out shall be 13 K, therefore only the EN 13414-7 and EN 13141-8 can be used. Must be measured with contribution from fan. For BVUs use EN 13414-7. For BVUs for single room installation use EN 13141-8. Flow measured according to EN ISO 5801. All other values are according to EN 13141-7 or EN 13141-8 depending on unit design. Temperature measuring points must be performed outside the unit, as contribution from fan must be included (in the ducts for ducted units). The ducts/connection box between the unit and measuring plane must be insulated with an insulation material with a thermal resistance of at least 1m2 K W-1 (approx. 50 mm insulation material). EN 13141-7 sets only requirements on the leakage (no requirements for the heat balance), and can be used to this extent. However, it is suggested to follow the requirements in EN 308 (leakage 3 % and heat balance 5 %). EN 13141-8 For units with alternating HRS there is an overall test model description in EN 13141-8 in section 5.4.7. Please note that it normally requires fast measuring equipment. It is recommended that necessary measures must be taken to ensure that outdoor and indoor mixing is reduced under test. Notes regarding not applicable standards: EN 308 is normally used to assess the performance of the HRS alone where contribution for fans is deducted and the test is performed with a temperature difference of 20K, therefore it cannot be used for RVUs. ISO 16494 describes a test procedure for an AHU with HRS, with specific demands regarding the static pressure in the inlets and outlets and fan settings. The test setup is equal to EN 14141-7 and EN 308. It refers to EN ISO 5801, ISO 3966 and EN ISO 5167-1 regarding airflow measurement method. ISO 16494 allows a large ambient temperature tolerance which influences the test results and it is not consistent with EN 13141 or EN 308.

Electric power input and effective power input CEN EN 13141-4 and EN 13141-7 supplemented by EN ISO 5801 EN 13141-7 (section 6.5) refers to EN 13141-4 (6.1) which refers to EN ISO 5801 (section 10). Definition in the standards is mostly ‘power input’ or ‘total power input’ and not ‘electric power input’ or effective power input as in Regulation 1253/2014. BVUs: To be measured summarised for both fans and control equipment

Sound Power Level (LWA) CEN EN ISO 9614-2 or EN ISO 3744 or EN ISO 3746 or EN ISO 3743-1 or EN ISO 3741 or ISO 13347 or EN ISO 9614-1 or EN ISO 3745 or EN ISO 3743-2 Can be measured according to EN ISO 9614-2 (sound intensity scanning) or EN ISO 3744 or EN ISO 3746 (sound pressure in free field). To reduce test costs, it is often preferred to use the sound intensity scanning method. Alternatively EN ISO 3743-1 or EN ISO 3741 sound power in reverberation room. Because of different methodologies used in the different standards, the reproducibility of results between one methodology and another one cannot be always guaranteed.

Reference pressure difference in Pa; CEN 13141-series acc. to product type supplemented by EN ISO 5801 For measuring method and notes, see ‘External total pressure difference’.

Maximum internal and external leakage rates and carry over CEN EN 308 EN 13141-7 EN 1886 ISO 16494 Leakage Both internal and external leakage can be tested according to EN 308 and EN 13141-7 (EN 13141-series only valid for RVUs). EN 308 focuses originally only on the HRS component, but can and is usually also applied to the test of the complete unit. In EN 308, it is only measured in one point (same as the regulation). In EN 13141-7 it is measured in three points. EN 1886 can only be used for external leakage. The flow used to calculate the leakage and carryover (in the standard described as the nominal air mass flow rate indicated by the manufacturer) is the reference flow for RVUs and the nominal flow for NRVUs as defined in Regulation 1253/2014. Carryover Carryover can be tested according to EN 308. It should be indicated in which direction the leakage is. Leaks from dirty to clean air should be avoided (from EHA-side to SUP-side). At low flows, the purge zone needs more time for cleaning and the rotor rpm must be reduced. This has a significant impact on the leakage and must be taken into consideration. Further description regarding leakage: A further enlightening of the leakage test is set out in Annex V (NRVUs) of Regulation 1253/2014, where it is described that the test and calculation can be carried out according to either a pressurisation test (acc. to the pressure set out in the definitions) or with tracer gas test method at declared system pressure although this is not clarified under (in line with) the definitions. The declared value is the specified leakage rate, complemented with information about the standard used. The test can either be carried out as a ‘static pressure test’ according to the pressure defined in the definitions, where the pressure is considered as a positive/negative applied pressure to the one side of the BVU (or inside/outside regarding external leakage) or as a ‘dynamic test’ (e.g. Extract Air Transfer Ratio — EATR) where the test pressure is the actual pressure difference inside the unit as a result of the reference/nominal configuration (external pressure). The tracer gas method is mentioned in EN 308 regarding leakage test but how to carry out the test is not described. The tracer gas method is described in ISO 16494 and EN 13141-7 and prEN 16798-3.

Mixing rate CEN EN 13141-8 EN 13141-8, (5.2.2.1) describes the test and calculation of the internal leakage and indoor and outdoor mixing. It is recommended that the measurement is carried out isothermally to reduce testing time, and the effect is not significant. Values for both indoor and outdoor mixing have to be declared. Mixing rate for alternating unit with combined discharge and intake ports are not possible to determine without contamination of the test room and consequently the mixing rate for these types of units is not to be declared before a revision of standards has developed a valid method.

Airflow sensitivity to pressure variations CEN EN 13141-8 Annex A and section 5.2.3 EN 13141-8 can be used.