Replacement of Drive Systems up to 75 kW
Motors and Drives
Measure Goal
The goal of this document is to estimate the electricity savings triggered by the replacement of electric motors up to 75 kW for the following standard cases: (i) Replacement of a constant speed motor with another constant speed motor, (ii) Replacement of a motor with frequency converter with another motor with frequency converter. Retrofitting with a frequency converter or special measures for torque or power control are not included in this documentation.
Examples and Scenarios
Replacement of motors, 5.5 kW power (built 2002), of two drive systems with flat belt without speed control, operating twelve hours daily all year round
Inputs
Betriebsdauer: 4'830 h/a
Requirements
Only measures that meet the requirements of the Energy Ordinance (SR 730.01; EnV) can be credited. The additional requirements for the technical characteristics and for the implementation of the measure are set out in Table 1.
| Old system | New system | |
|---|---|---|
| Technology | This measure applies to motors and frequency converters with a rated power Pnom of up to 75 kW that fall within the scope of Annex 2.7 EnEV. | |
| Energy efficiency | - | The new components of the drive system must meet at least the following limit values according to EnEV: Motors Class IE4 Frequency converter Class IE2 |
| Sizing | The total installed rated power of the new system must be less than or equal to the total installed rated power of the old system. | |
| Implementation | The replacement and commissioning of the new system must be carried out by a qualified specialist or company. | |
| Disposal | The consumption-relevant components of the old devices may not continue to be operated within Switzerland. Proper disposal or export must be demonstrable on request. | |
Proof of compliance
Compliance with the requirements must be demonstrated by the following documents. The documents listed in Table 2 are an integral part of the proof of measure implementation.
- 1.Explanation (PDF format, max. 2 A4 pages) of how it is ensured that the replaced devices were properly disposed of (e.g. by means of declarations, disposal items on contractor invoices, etc.).
- 2.Invoice documents (PDF, PNG or JPEG format)
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ContactSymbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
Ė | electrical power | kW |
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
f | Factor | — |
Ns | Standard effective duration | a |
Pm | mechanical power | kW |
t | annual operating hours | h/a |
τ | Motor load | — |
η | Efficiency | — |
Calculation Formulas
Creditable Electricity Savings
The cumulative electricity savings result from the difference between electricity consumption before and after the measure, multiplied by the reduction factor (0.75) and the standard effective duration.
Annual Electricity Consumption(ohne Verbrauchsprofil)
Electricity consumption is calculated based on the motor's rated power, annual operating hours, average motor load and efficiency. A reduction factor accounts for efficiency losses at lower partial loads.
Annual Electricity Consumption(mit Verbrauchsprofil)
With a known consumption profile, the average power consumption during operation is multiplied by the annual operating hours.