Certified Energy Efficiency. - Robatherm · energy efficiency labeling according to EUROVENT. In...

Certified Energy Efficiency.

robatherm air handling units always conform to the current energy efficiency classification: according to the EUROVENT Guideline or the AHU-Guideline of the German AHU Manufacturers Association.

© robatherm 05/2016

Energy Efficiency: Always Up-to-Date with robatherm.

As has been common practice in white goods (refrigerators, washing machines) for years, energy efficiency classifications of air handling units (AHUs) provide reliable guidance. The energy efficiency of AHUs is governed by several guidelines. robatherm offers the energy efficiency classification according to both, the European industry association EUROVENT and the German AHU Manufacturers Association Herstellerverband Raumlufttechnische Geräte e.V. SFPV Value Unsuitable for Evaluating AHUs

The use of the specific fan power under validation conditions – the SFPV value according to DIN EN 13779 – provides only a rudimentary evaluation of the overall air handling system. The AHU-system’s efficiency is only taken into indirect consideration. This is due to the fact that the SFP-value is significantly influenced by the external pressure loss, which is neither influenceable by the AHU manufacturer nor dependent upon the quality of the device. Specific Fan Power SFPV|1, 2 according to DIN EN 13779

Additional values for components according to DIN EN 13779

Recommended SFP-classes for AHU-systems according to DIN EN 13779

|1 to be determined with clean filters and dry mounting parts

|2 Plus additional values for components according to DIN EN 13779

|3 Minimum requirement according to the German EnEV 2014


New SFPint Value for Evaluating AHUs With the introduction of the ErP Regulation (EU) 1253/2014 (Energy-related Products) by the European Union on January 1, 2016, a new criterion has come into force for evaluating and comparing AHUs based on a specific reference configuration: the SFPint value. The efficiency is to be evaluated using a reference configuration that is selected depending on whether the unit under test is a unidirectional ventilation unit (UVU) or a bidirectional ventilation unit (BVU). The evaluation of the AHU is performed on the basis of the efficiency of fan motor unit, filter, and heat recovery system (HRS) in terms of the so-called internal specific fan power, SFPint. Unlike the SFPV value, neither additional built-in parts nor external pressure loss are taken into account so that the efficiency of the AHU can be evaluated directly.

For further information and documents on the ErP Directive (Ecodesign Directive) please visit our website at www.robatherm.com or email our ErP team at [email protected].

The ErP Regulation (EU) 1254/2014 defines and specifies energy efficiency classes for residential ventilation units only while excluding non-residential ventilation units. For such units, both the European industry association EUROVENT and the German AHU Manufacturers Association Herstellerverband Raumlufttechnische Geräte e.V. have issued pertinent guidelines defining energy efficiency classes for voluntary use.


Further Energy-Relevant Values The energy demand of AHUs is primarily determined by the following parameters: the air velocity in the unit, the electric power input of the fan motor, and the quality of heat recovery. Air velocity classes|4 according to DIN EN 13053

DIN EN 13053 is currently being revised. The revised standard will omit Class V8 and Class V9. Electrical power input classes according to DIN EN 13053

|4 The velocities are related to the filter cross-section of the AHU-device

|5 with static pressure loss ∆pstat [Pa] and air flow rate qv [m³/s]


Heat recovery classes|6 according to DIN EN 13053

Reference values

|6 Classes define the quality of heat recovery for conditions of balanced mass flows (1:1) irrespective of the HRS

The sole application of the thermal efficiency of the HRS is no longer permitted |7 The data is based on the values according to DIN EN 13053 as shown on the right-hand side of the table above |8 with thermal efficiency (dry) ηt [%] according to EN 308 (for 1:1 mass flow ratio) |9 with volume flow rate: qv [m³/s]; operating power HRS: Pel_Aux [W]

DIN EN 13053 is currently being revised. The revised standard will specify changed requirements and will omit Class H6. The ErP Regulation (EU) 1253/2014 as of January 1, 2016 also specifies requirements regarding the thermal efficiency of heat recovery systems.


Energy Efficiency Classes According to EUROVENT The EUROVENT procedure provides for six energy efficiency classes (A+ to E). Some of the requirements to be met by the classes are significantly stricter than the legally required minimum according to ErP Regulation (EU) 1253/2014. EUROVENT applies a compensation procedure. In this case, not all individual reference values of the desired energy efficiency class must be complied with. For example, a HRS’ lower heat recovery coefficient can be compensated by a better (lower) power input of the fan motor. The compensation of the parameters air velocity, pressure loss of the HRS, thermal efficiency of the HRS, and fan efficiency is based on the conversion to standard pressure loss allowances. EUROVENT reference values according to Rating Standard RS 6/C/005-2016

|10 Minimum requirement ErP Tier 2018 for other HRS |11 Minimum requirement ErP Tier 2016 for other HRS and ErP Tier 2018 for run-around HRS |12 Minimum requirement ErP Tier 2016 for run-around HRS

To be permitted to implement this procedure, the members are subject to a strict certification process. This also includes, besides the annual inspections of the design software, measurements on real units, whereas the real unit must fulfill the performance data that has been denoted. This inspection may only be carried out by accredited inspection institutions (e.g. TÜV).


Energy Efficiency Classes According to German AHU Manufacturers Association

The energy efficiency classes according to the German AHU Manufacturers Association are based on the legal minimum requirements of ErP Regulation (EU) 1253/2014 in force since January 1, 2016; i.e. ErP Tier 2016 corresponds to Class A and ErP Tier 2018 to Class A+. AHUs not complying with an ErP Tier fall within Class B, and placing them on the market in the European Economic Area is no longer permitted. Additionally, the defined classes for air velocity, heat recovery, and electric power input must be complied with. Unlike the EUROVENT procedure, all the specified performance requirements must be fulfilled in order for the energy efficiency label of the German AHU Manufacturers Association to be issued; i.e. no compensation is performed based on the primary energy demand.


Both Classification Systems Compared from the Energy Viewpoint robatherm offers the energy efficiency classification according to both, the European industry association EUROVENT and the German AHU Manufacturers Association Herstellerverband Raumlufttechnische Geräte e.V. Due to the different calculations used, for instance Class A+ according to EUROVENT is not identical with Class A+ according to the German AHU Manufacturers Association. Example calculation reveals the differences The differences between the two classification systems become evident in the following calculation example. Calculation conditions: • Combined unit 10,000 m³/h (ODA and ETA) • Filter F7 (ODA), filter M5 (ETA) • HRS: rotor • Additional component: 1 air heater in the air supply • EC fans • Site: Munich • Type of use: open-plan office of seven desks or more • Operating time: 5 days/week, 5:00 a.m. to 8:00 p.m. Technical data


Comparison of costs

The example calculation clearly shows the differences. Classification to EUROVENT in this case means initial extra capital costs of 8%. On the other hand, the energy costs for the AHU with A+ energy efficiency labeling according to the German AHU Manufacturers Association are 18% higher than those for the AHU with A+ energy efficiency labeling according to EUROVENT. In this example, the specific savings in energy costs for the AHU certified to EUROVENT will be 11,500 € after five years. This compensates for, e. g., the energy expenses for an entire year. The TrueBlue efficiency certificate by robatherm allows different unit variants to be compared. In the present case, two AHUs with A+ energy efficiency label, one according to EUROVENT and the other to the German AHU Manufacturers Association, were compared with each other. Are you interested in the complete TrueBlue efficiency certificate? Please email us at [email protected] and we will send you the complete TrueBlue efficiency certificate. Also, we will be glad to provide you with a TrueBlue efficiency certificate for your own specific project.

robatherm cannot accept any guarantee or liability for the correctness and completeness of this document’s contents. Illustrations and descriptions partially include accessories not included in the standard design. Subject to technical alterations. Version 05/2016. Copyright by robatherm.

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