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Energy Trend Knowledge Base

Practical articles on energy audits, energy costs and modernisation — written by Energy Trend’s auditors and engineers.

Energy Efficiency in Industry, Energy technologies

Selecting a variable frequency drive for an industrial motor – ratings, load and control

Selecting a variable frequency drive for a motor requires checking the current, voltage and actual load characteristics. Using a 15 kW drive as an example, we explain how to assess overload capacity, cooling, cables and control requirements. We also show why correct motor control does

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Energy Efficiency in Industry, Energy technologies

Chiller operation at part load – short cycling and capacity control

When cooling demand is low, chillers may repeatedly start their compressors even when the installed capacity is adequate. We explain how to identify short cycling, assess minimum capacity and examine the effects of flow rates and chiller staging. We also outline the measurements and indicators

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Energy technologies

Capacitor banks: sizing, detuning reactors and common mistakes in industrial plants

A capacitor bank can reduce the inductive reactive power drawn from the grid, but only if its specifications match actual operating conditions. We explain how to use P/Q profiles to select the total rating and individual steps, and when detuning reactors should be considered. We

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Energy Efficiency in Industry, Energy technologies

Industrial automation and energy use in manufacturing – control based on process demand

Controlling energy-consuming equipment can reduce unloaded running time and match equipment output to process demand. We explain which signals, safeguards and tests are needed before changing controller software, and how to measure energy performance without mistaking lower production for savings.

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Energy Efficiency in Industry, Energy technologies

HVAC controls: where they save energy and how to plan an upgrade

HVAC controls can align ventilation, heating and cooling with actual demand, but the outcome depends on setpoints and the condition of the installation. We explain which signals and control algorithms to examine, how to plan an upgrade and which tests to include in acceptance procedures.

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Energy technologies

Active reactive power compensator or capacitor bank – how to choose

An active reactive power compensator is particularly useful where reactive power demand changes rapidly and in both directions. This article compares SVGs, capacitor banks and hybrid systems, taking harmonics and phase unbalance into account. It explains which measurements and acceptance criteria support a cost-effective choice.

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Energy Efficiency in Industry, Energy technologies

Agregat chłodniczy przemysłowy – jak dobrać moc i warunki pracy

Agregat chłodniczy powinien pokrywać zapotrzebowanie procesu także poza nominalnym punktem pracy. Pokazujemy, jak obliczyć moc z przepływu i temperatur oraz jak porównać EER, SEPR i pobór energii całego układu. Sprawdź, jakie dane zebrać przed zapytaniem ofertowym i kiedy rozważyć kilka jednostek zamiast jednej.

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Energy audits, Financing and regulations

FEWiM 2.1 – grant for energy renovation of residential buildings in Poland’s Warmian-Masurian Voivodeship

FEWiM 2.1 provides for two planned calls aimed at improving the energy efficiency of residential buildings, separately for projects worth more than EUR 200,000 and projects not exceeding that amount. The current criteria require a separate energy audit for each building and at least 30%

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Energy audits, Financing and regulations

Public building energy renovation grant in Poland’s Warmian-Masurian Voivodeship – FEWiM 2.1

A new call under FEWiM 02.01, Scheme C – public buildings, was added to the schedule on 8 September 2026, but the detailed conditions still need to be confirmed against the current call documentation. We explain what a local government unit (LGU) can prepare now:

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