Mastering the Art of Calculating Ecodesign Standards

HQ Tel. +49(0)89-235-16-801

US Tel. +1 765-780-7139

In our previous publication, we delved into the importance of adopting ecodesign standards in the modern world. Here at Blauberg Motoren, we are firmly convinced that any modern company that wants to preserve the future must wholeheartedly embrace the principles of ecodesign. We have therefore committed ourselves to revisiting this important topic from a technical point of view.

Ecodesign requirements for fans with a motor with a rated electrical power of 125 W to 500 kW. Commission Regulation (EU):

Fan types	Measurement category (A-D)	Efficiency category (static or total)	Power range P in kW	Target energy efficiency	Efficiency grade (N)
Axial fan	A, C	static	0,125 ≤ P ≤ 10	ηtarget = 2,74 · ln(P) – 6,33 + N	40
			10 < P ≤ 500	ηtarget = 0,78 · ln(P) – 1,88 + N
	B, D	total	0,125 ≤ P ≤ 10	ηtarget = 2,74 · ln(P) – 6,33 + N	58
			10 < P ≤ 500	ηtarget = 0,78 · ln(P) – 1,88 + N
Centrifugal forward curved fan and centrifugal radial bladed fan	A, C	static	0,125 ≤ P ≤ 10	ηtarget = 2,74 · ln(P) – 6,33 + N	44
			10 < P ≤ 500	ηtarget = 0,78 · ln(P) – 1,88 + N
	B, D	total	0,125 ≤ P ≤ 10	ηtarget = 2,74 · ln(P) – 6,33 + N	49
			10 < P ≤ 500	ηtarget = 0,78 · ln(P) – 1,88 + N
Centrifugal backward curved fan without housing	A, C	static	0,125 ≤ P ≤ 10	ηtarget = 4,56 · ln(P) – 10,5 + N	62
			10 < P ≤ 500	ηtarget = 1,1 · ln(P) – 2,6 + N
Centrifugal backward curved fan with housing	A, C	static	0,125 ≤ P ≤ 10	ηtarget = 4,56 · ln(P) – 10,5 + N	61
			10 < P ≤ 500	ηtarget = 1,1 · ln(P) – 2,6 + N
	B, D	total	0,125 ≤ P ≤ 10	ηtarget = 4,56 · ln(P) – 10,5 + N	64
			10 < P ≤ 500	ηtarget = 1,1 · ln(P) – 2,6 + N
Mixed flow fan	A, C	static	0,125 ≤ P ≤ 10	ηtarget = 4,56 · ln(P) – 10,5 + N	50
			10 < P ≤ 500	ηtarget = 1,1 · ln(P) – 2,6 + N
	B, D	total	0,125 ≤ P ≤ 10	ηtarget = 4,56 · ln(P) – 10,5 + N	62
			10 < P ≤ 500	ηtarget = 1,1 · ln(P) – 2,6 + N
Cross flow fan	B, D	total	0,125 ≤ P ≤ 10	ηtarget = 1,14 · ln(P) – 2,6 + N	21
			10 < P ≤ 500	ηtarget = N

Measurement category A is a classification in which the fan is measured with free inlet and outlet conditions;
Measurement category B - a classification in which the fan is measured with a free inlet and a duct installed at its outlet;
Measurement category C - a classification in which the fan is measured with a duct installed at its inlet and with a free outlet;
Measurement category D - a classification in which the fan is measured with a duct installed at its inlet and outlet;

Calculation method

The methodology for calculating the energy efficiency of a particular fan is based on the ratio of the gaseous flow capacity to the motor's rated power, where the gaseous flow capacity of the fan is the product of the gaseous flow volume and the pressure difference across the fan. Pressure is either static pressure or total pressure, which is the sum of static and dynamic pressure depending on the efficiency category and measurement.

The information can be summarized as follows:

Calculation of Overall Efficiency for Fans Supplied as "Final Assembly":

a) If the fan does not include a speed converter:

η_e = P_u(s)/P_e,

P_u(s) is the power of the gaseous substance flow in the fan at its optimum energy efficiency point.

P_e is the power measured at the input terminals of the fan motor at its optimum energy efficiency point.

b) If the fan includes a speed converter:

η_e = (P_u(s)/P_ed) • C_c

P_u(s) is the power of the gaseous substance flow in the fan at its optimum energy efficiency point.

P_ed is the measured power at the input terminals of the fan speed frequency converter at its optimum energy efficiency point.

C_c is the correction factor for partial load.

Calculation of Overall Efficiency for Fans Supplied as "Incomplete Assembly":

η_e = η_r • η_m • η_T • C_m • C_c,

η_r is the efficiency of the fan impeller based on P_u(s)/P_a.

P_u(s) is the fan gaseous flow power at the point of optimal energy efficiency of the impeller.

P_a is the fan shaft power at the point of optimal energy efficiency of the impeller.

η_m is the nominal efficiency of the electric motor.

η_T is the efficiency of the driving mechanism.

C_m is a correction factor to account for component mismatch.

C_c is the correction factor for partial load.

Calculation of Power of the Gaseous Substance Flow in the Fan:

The power of the gaseous substance flow in the fanP_u(s) is calculated based on the measurement category selected by the fan supplier:

For measurement categories A:

P_us = q • p_sf • k_ps;

For measurement categories B:

P_u = q • p_f • k_p;

For measurement categories C:

P_us = q • p_sf • k_ps;

For measurement categories D:

P_u = q • p_f • k_p.

So, we have briefly reviewed the methodology for calculating the eco-design standards for our fans, which can be found here: 32011R0327 - EN - EUR-Lex and our fans with EC motors can be found here: Blauberg Motoren catalog

Let's move on to the ecodesign requirements for electric motors. Commission Regulation (EU):

Rated efficiency of electric motors of IE3 level (50 Hz)

Rated output power, kW	Number of poles
Rated output power, kW	2	4	6
0.75	80.7	82.5	78.9
1.1	82.7	84.1	81
1.5	84.2	85.3	82.5
2.2	85.9	86.7	84.3
3	87.1	87.7	85.6
4	88.1	88.6	86.8
5.5	89.2	89.6	88
7.5	90.1	90.4	89.1
11	91.2	91.4	90.3
15	91.9	92.1	91.2
18.5	92.4	92.6	91.7
22	92.7	93	92.2
30	93.3	93.6	92.9
37	93.7	93.9	93.3
45	94	94.2	93.7
55	94.3	94.6	94.1
75	94.7	95	94.6
90	95	95.2	94.9
110	95.2	95.4	95.1
132	95.4	95.6	95.4
160	95.6	95.8	95.6
200 - 375	95.8	96	95.8

Methods of measurement and calculation:

1. To ensure compliance with the requirements for ecodesign for electric motors, measurements and calculations are carried out using the methods established in national standards, compliance with which gives a presumption of compliance of electric motors with the requirements of the Technical Regulations on Ecodesign Requirements for Electric Motors.

2. The efficiency of the electric motor in accordance with the Ecodesign Requirements for Electric Motors of the Technical Regulation shall be determined by the rated output power (PN), rated voltage (UN) and rated frequency (fN).

3. The total energy loss is determined by measuring the total energy loss or the sum of the individual energy losses in the motor.

Choose our IE3 motors here: IE3 Motors

For details on how to calculate the Ecodesign standards for motors, click here: 32019R1781 - EN - EUR-Lex