ANNEX II
MEASUREMENT METHODS AND METHODOLOGY FOR CALCULATING THE ENERGY EFFICIENCY INDEX
1. MEASUREMENT METHODS
For the purposes of compliance and verification of compliance with the requirements of this Regulation, measurements shall be made using a reliable, accurate and reproducible measurement procedure that takes into account the generally recognised state of the art measurement methods, including methods set out in documents the reference numbers of which have been published for that purpose in the Official Journal of the European Union.
2. METHODOLOGY FOR CALCULATING THE ENERGY EFFICIENCY INDEX
The methodology for calculating the energy efficiency index (EEI) for circulators is as follows:
1.
Where a circulator has more than one setting of head and flow, measure the circulator at the maximum setting.
‘Head’ (H) means head (in metres) produced by the circulator at the specified point of operation.
‘Flow’ (Q) means the volume flow rate of water through the circulator (m 3 /h).
2.
Find the point where
Q · H
is maximum and define the flow and head at this point as: Q 100 %
and H 100 %
.
3.
Calculate the hydraulic power P hyd
at this point.
‘Hydraulic power’ means an expression of the arithmetic product of the flow (Q), Head (H) and a conversion factor that aligns the units used in the calculation.
‘P hyd
’ means hydraulic power delivered by the circulator to the fluid being pumped at the specified point of operation (in watts).
4.
Calculate the reference power as:
P ref
= 1,7 · P hyd
+ 17 · (1 – e –0,3 · P hyd
), 1 W ≤ P hyd ≤ 2 500 W
‘Reference power’ means a relation between hydraulic power and power consumption of a circulator, taking into account the dependency between circulator efficiency and size.
‘P ref
’ means the reference power consumption (in watts) of the circulator.
5.
Define the reference control curve as the straight line between the points:
( Q
100 % , H
100 % ) and ( Q
0 % ,
)
6.
Select a setting of the circulator ensuring that the circulator on the selected curve reaches
Q · H
= max point.
7.
Measure P 1
and H at the flows:
Q 100 %
, 0,75 · Q 100 %
, 0,5 · Q 100 %
, 0,25 · Q 100 %
.
‘P 1
’ means the electrical power (in watts) consumed by the circulator at the specified point of operation.
8.
Calculate at these flows
, if H meas ≤ H ref
P L = P 1,meas , if H meas > H ref
where H ref
is the head on the reference control curve at the different flows.
9.
Using P L
and this load profile:
Flow
[%]
Time
[%]
100
6
75
15
50
35
25
44
Calculate the weighted average power P L,avg
as:
P L,avg = 0,06 · P L,100 % + 0,15 · P L,75 % + 0,35 · P L,50 % + 0,44 · P L,25 %
Calculate the energy efficiency index ( 1 ) as:
, where C 20 %
= 0,49
( 1 ) C XX % means a scaling factor that ensures that at the time of defining the scaling factor only XX % of circulators of a certain type have an EEI ≤ 0,20.