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The September deadline for the ErP Direcve for Warm Air Heaters 2018 (Lot 21) is fast approaching. New legislaon has changed the way that the seasonal eciency of heang equipment is calculated. Danny Packham, European Product Manager – Warm Air and Radiant, at Nortek Global HVAC, outlines the key points.
burning the fuel at point of use currently provides an efficient thermal and seasonal efficiency, the way in which manufacturers calculate seasonal efficiency (from 1st January 2018), changed due to ErP (Energy related Products) legislation coming into force.
G What is ErP?
ErP is part of the Ecodesign regulation (EU) 2015/1188 which, along with the implementing Directive 2009/125/EC is an EU policy aimed at improving the energy efficiency and other environmental performance criteria for energy- related products (ErP), such as radiant and warm air heaters.
How is equipment categorised?
Products have been divided into groups or ‘Lots,’ with warm air heaters using gaseous or liquid fuels contained within Lot 21 and radiant heaters within Lot 20.
What are the requirements?
Each Lot provides the minimum energy efficiency and environmental values for each heating technology. Any product that does not comply, cannot be marketed and sold within the EU – including the UK.
Following the EU referendum, the requirements of Ecodesign will still have to be complied with as
as fired warm air and radiant heating systems are long- standing technologies associated with effectively heating large open (industrial or commercial) spaces. By
ERP DIRECTIVE BSEE ERP: are you ready for the next milestone?
it could take up to two years to finalise the process. But unless new UK legislation is introduced, ErP will continue as one of methods employed by the Government to reduce the environmental impact of heating technology. Lot 21 (warm air) has a max NOx emission of 100mg/kWh input plus a minimum seasonal efficiency of 72%. Seasonal efficiency is calculated from airflow temperature rise, thermal efficiency and electrical power consumption. Lot 21 also applies to AHUs and includes the performance of any heating / chilling coils, where human comfort is the primary heating purpose. Essentially, other than outdoor (heating an outdoor space) units, air curtains or ambient units, all products need to comply with either Lot 20 or Lot 21, plus the motor efficiency ErP regulation.
Implementaon date
Lot 21 (warm air heaters): Minimum seasonal efficiency came into force on the 1st January 2018, with the maximum NOx levels applicable September 2018.
The second tier for ErP will be 2021, whereupon seasonal efficiency will increase to 78% and maximum NOx emission for gaseous fuels will be <=70mg/kWh input.
Crucially, the minimum criteria for Lots 20 and 21 are applicable for new installations and when replacing existing products.
Unlike other products, warm air heaters and other commercial heating appliances are directly planned and purchased by HVAC professionals, the Regulation 2015/1186 excludes warm air heaters and other commercial heaters from mandatory energy labelling. However, product literature and free access websites of manufacturers must indicate the seasonal efficiency and NOx emissions for each product or system.
Air Curtains are not considered warm air heaters by the scope of this Directive.
Will the NOx reducon aect products?
It should not affect the products, but may affect the product offering from manufacturers. Older technologies will be withdrawn or modified to comply.
How does ErP seasonal eciency dier?
On initial appearance the ErP seasonal efficiency looks to be a lot lower than the current building regulations seasonal efficiency calculation, however when these minimum thermal & radiant efficiencies are added into the ErP seasonal efficiency calculator, the approximate results are as follows:- uGas fired warm air heaters (atmospheric) = 70% (2% below) uRadiant (unitary) heaters = 71% (3% below) Therefore, a net increase of approx. 2% will be realised for warm air heaters and 3% for unitary radiant heaters manufactured 1st January 2018 onwards.
As mentioned before, ErP seasonal efficiency is calculated differently and produces a different result. A figure that is far lower than those previously used in the NCM tool (i.e SBEM), therefore please ensure that the relevant seasonal efficiency figure is entered when carrying out your calculations. Remember, the seasonal efficiency shown by manufacturers on websites, technical manuals and sales brochures post 2018 will be ErP seasonal efficiency.
www.nortek-erp.com
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BUILDING SERVICES & ENVIRONMENTAL ENGINEER AUGUST 2018 13
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