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All you need to know about Eurovent’s new “summer label” for AHUs
An overview of Eurovent Certification’s new Energy Efficiency Classes for Summer Application (EECS) label for certified air handling units
What is the purpose of the new energy label?
Eurovent Certification is set to launch the Energy Efficiency Classes for Summer Application (EECS) label for air handling units (AHUs). The new “summer label” reflects energy saving for warmer weather conditions and has the added benefit of acknowledging humidity recovery and its contribution to overall energy efficiency performance. The new label also gives a realistic representation of the usefulness and necessity of a certain energy recovery efficiency, with the air resistance that this may cost at a certain fan efficiency.
By end of September 2021, all Eurovent-certified Air Handling Units must be updated with summer label. However, some companies, such as Systemair and Menerga, will be giving their customers the option to print the extra label through the online selection tools for all its Eurovent-certified AHUs by June.
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How does the summer label benefit your project?
The Eurovent certification’s Energy Efficiency Classes for AHUs has become a trusted reference point for the market through its easy rating scheme. Over the years, it has served as trustworthy indication of reliable performance data and quality products. It helps customers to effortlessly compare various brands.
The summer label expands upon these existing advantages and ensures simple conditions can be set for the selection of an AHU by looking at the performance of the units in warm climates, instead of only according to winter conditions. The label strengthens the idea of energy saving in the context of hot weather situations and by acknowledging humidity recovery.
The summer label serves as an important addition to the winter label and provides an easier reference for customers in warmer regions to choose the most suitable equipment that will meet their requirements in a simpler and more straightforward manner.
What are the parameters of the energy classes under the new summer label?
The Eurovent Certification summer label utilises ASHRAE climate database to obtain realistic climate conditions. This ensures customers can get the most accurate energy calculation and assessment. Customers can select their location or the closest city available to get the suitable options in the AHU configurators. The calculations have considered the temperature and humidity of outdoor conditions during the hottest month of the year.
This means that in general to have a unit with an A-label:
The velocity over the filter cannot exceed 1,6m/s
The thermal efficiency of the heat recovery must be at least 78%
The dry pressure drop of the heat recovery cannot exceed 160Pa
The latent efficiency of the heat recovery must be at least 73%
The wet pressure drop of the heat recovery cannot exceed 213Pa
The fan efficiency grade must be at least 62%
However, if any of the mentioned values above is not reaching the demand, it can be compensated by a value that is higher as the demand. This is handled in a complex calculation in which all these requirements are summed up to a reference value for each of the energy classes.
When is the summer label applicable?
In the event the conditions meet the below specifications, both the summer and winter labels must be printed on the technical data of the product being distributed. If the conditions do not meet the below requirements, only the winter label is mandatory to be printed and included, even though customers have the option to print both if they wished.
a)
Winter Design condition (actual selection1) ≥ -3°C AND Design dry-bulb temperature (from ASHRAE 2017 Climatic Design Conditions) ≥ 30°C
b)
Winter Design condition (actual selection) ≥ -3°C AND Design dew-point temperature (calculated with wet bulb temperature from ASHRAE 2017 Climatic Design Conditions) ≥ 17°C
c)
Design dry-bulb temperature (from ASHRAE 2017 Climatic Design Conditions) ≥ 30°C AND Design dew-point temperature (calculated with wet bulb temperature from ASHRAE 2017 Climatic Design Conditions) ≥ 17°C
It is important to mention that the air resistance of the batteries themselves, heating or cooling, is not included in the label calculation. Good guideline values for the maximum air resistances are 250 Pa for the cooler and 100 Pa for the heater. Combining both in a so-called “change-over“ battery is also a very energy-efficient solution.
What else does Eurovent have in store for AHU energy labels?
Eurovent Certification is expected to undergo three stages of updates in relation to the summer energy label for AHUs.
The acknowledgement of energy recovery serves as the first stage.
The second stage, which is expected to be initiated in the following year, will bring the benefit of indirect adiabatic cooling.
The third stage will highlight the reduction of pressure drop over the bypass of the heat recovery system to bring in a better energy class.
The Eurovent Certification summer label utilises ASHRAE climate database to obtain realistic climate conditions. This ensures customers can get the most accurate energy calculation and assessment. Customers can select their location or the closest city available to get the suitable options in the AHU configurators. The calculations have considered the temperature and humidity of outdoor conditions during the hottest month of the year.
An overview of energy efficiency calculations for certified AHUs
A summary of Eurovent’s energy efficiency calculations and corresponding labels.
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Please note: The symbol of the “sun“ indicates that it is the summer label, and the symbol of the ”snowflake” indicates that it is the winter label. The year mentioned in the classification is the year of the release of the calculation method, which is 2020 for the summer label and 2016 for the winter label.