ECO POWER FEAT RE ECO POWER FEA ATURE


MEETING THE ECODESIGN DIRECTIVE REQUIREMENTS FOR VENTILATION UNITS COST-EFFECTIVELY


ry 1st2016t e EcodesignDire ivectve requirements for vefo ve units (L t 6) ca e into force. Here, David Whiite, UK service sales Fläkt Woods, explains that refurbishing existing equipment


On J nuary 1st 2016 the Ecodesign Directive requirem its (Lot6) cam into force manager at FläktWo


OnJanuary re,D ma gy ktWoods ex energy consumpt n electr te explains that refurbi hing ex service sale exi ting equipment


can be a cost-effective way to meet the new legislation and reduce energy consumpti


canbe a cost- ffectivewveway tomeet thenewlegislationandreduce y l adandCO2emissions.


ption,, electriicity load and CO2 em sions.


nOctober 21 2009 the EU adopted the Directive 2009/125/EC: establishing a framework for the setting of ecodesign requirements for energy-related products (ErP). The directive applies to energy-related products (defined as products that use energy, or do not use energy, yet have an indirect impact on energy


O gy consumption) sold


potential to reduce green h and energy, and therefore


in the domestic, commercial and industrial sectors in the European Economic Area. The directive involves dozens of product groups – called ‘Lots’– and so far the focus has been on the ones that consume the largest proportion of natural resources have themost ouse gases.


LOT 6 COVERS VEN ILAT COVERS VENTILA ION UNITS ATION UNITS


Ventilation, heating and air conditioning represents about 15 per cent of the total energy consumption in the EU, and it’s an area where significant savings can be made. It is thought that the


implementation of Lot 6 will result in annual European energy savings of 1,300 PJ


PJ (PetaJoule) by the year 2025. This corresponds roughly to a year’s worth of electricity production in th Lot 6was implemented o


n January 1 2016, e UK.


with further changes coming into force on January 1 2018. It has establishedminimum performance requirements for ventilation units,which prior to Ecode sign variedwidel y in terms of their energy efficiency.


In accordance with the directive, the new requirements for non-residential ventilation units, with some exceptions*, are that: 1. All ventilation units, except fans with more than one range of application (for example fans used for both ventilation and combustion gas extraction), shall be


equipped with a step-by-step or a variable speed controller.


2. All ventilation units with two


directions of airflow shall have a heat recovery system.Mixing boxes on their own do not constitute heat recovery. 3. The heat recovery systemshall have a thermal bypass. Thismeans heat recovery regulation between 1-100 per cent.


4. In ventilation units with two directions of airflow, theminimumthermal efficiency


*The following are exempt:


*The following are exempt:


• Units with an electric power below 30W


• Units with an electric power below 30W


• ATEX Directive • AT ATEX Directive


((explosive atmospheres) • Units exclusively for


explosive atmospheres) • Units exclusively for


emergency use for shoremergency use for short periods ofperiods of timetime


• High temperature applications (above 100ºC in airstream or


applications (above • High temperature


voltage applications external drives), hig above 65ºC ambient


• In toxic, corrosive


environments or in inflammable


environments or in environments with abrasive materials


abrasive materials environments with


• Applications where the fan motor is operating at temperature below


fan motor is operati • Applications wher


temperature below


-40ºC • Kitchen fans


• Kitchen fans -40ºC


/ ENERGYMANAGEMENT ENERGYMANAGEMENT


• In toxic, corrosive, inflammable


00ºC in airstream or above 65ºC ambient for external drives), high voltage applications


s for ven ilationntilation


legally sold, ventilation units in the EU market need tomeet the new Ecodesign requirements – so non-compliant


products have effectively been phased out. The requirements apply to new buildings and the renovation of existing buildings. Unfortunately, because of thewaymany existing UK buildingswere designed, the supply and extract systems are not generall y speaking, located close to each other. For example, some large existing commercial buildings have supply AHUs in the basement and extract fans on the roof, separated by upward


,


rds of 80mand a number of floors. Rather than redesigning the entire building’s plant routes andmechanical strategy, a significantlymore cost-


retrofitmore efficien to refurbish the exist effective, yet still effi


cient, solution can be


t fans at each end o f ing equipment and


Figure1: Figure1: Thermalwheel Figure 2: Figure 2:


Centriflow Plug PM Plug Angle Side View


Centriflow Plug PM Plug Angle Side View


hermalwheel


of all heat recovery systems at airflow (except run-around liq


uid systems) balanced


shall be aminimumof 67 per cent from January 1 2016 and aminimumof 73 per cent fromJanuary 1 2018.


5. In ventilation unitswith two directions of airflow, theminimumthermal efficiency of run-aro


round liquid heat recovery systems at balanced airflowshall be aminimumof 63 per cent fromJanuary


of 68 per cent fromJanuary


the system(supply and extract). Heating and cooling duties can be changed and suitable heat exchangers installed, systempressures can be changed and low loss filters employed. Demand control can be retrofitted, where


occupancy or CO2 levels can be used as the determining factor for fan speed.


Plug fans represent a cost-effective way to extend the life of HVAC plant, improve duty and improve efficiency; by upgrading just the fan the equipment can becom e


,


ry 1 2016 and aminimum Ecodesign Directive compliant, and ry 1 2018.


significant savings can bemade.


6. The ratio between specific fan power (SFP) and the heat recovery system’s efficiency is specified in a formula. If the efficiency on heat recovery for example is higher than 67 per cent, a higher specific fan power (SFP) is permissible. This requirement will be implemented in two steps – the first on January 1 2016, and the second, withmore stringe nt demands, on January 1 2018. A new SFP value has been created, called SFPint. This is a theoretical value to enable a limit on


In order to obtain a CEmark efficiency for different AHU co


nfigurations. and be


If heat recovery is a target for the end- user, run-around coils can be retro-fitted. A prime opportunity for this is the removal of frost coils (pre-heaters) and the installation of a run-around coil system instead. Providing the supply and extract duct systems are nomore than 20mapart this becomes a cost-effective retrofit. Thermal wheels, whi ch are probably th e most efficient heat recovery device available on themarketplace, can be retrofitted where supply and extract AHUs are double stacked.


A further point tomake is that any replacement cross plate heat exchanger AHUs would need a plate of aminimum67 per cent efficiency. The likelihood is that the replaced unit would have a heat


recovery efficiency of only 50 per cent (i.e. compliant to the old regulations), and a 67 per cent efficient plate takes up a lotmor e space andmay not fit into the existing space, creating a need for refurbishment rather than replacement.


Fläkt Woods


www.flaktwoods.co.uk T: 01206 222555


www.flaktwoods.co.uk ENERG MANAGEMEN ENERGY MANAGEMENT | SU SUMMER 201 ER 2016 17 17


MEETING THE ECODESIGN DIRECTIVE REQUIREMENTS FOR VENTILATION UNITS COST-EFFECTIVELY


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