Top FAQs

Submitted by Hans De Keulenaer on Thu, 2006-12-07 13:00.

About

Avg Daily hits	Total hits	Post title
0	402	What kind of information can I expect from Leonardo ENERGY?
0	373	In which fields is Leonardo ENERGY active?
0	351	What is Leonardo ENERGY?

Carbon emissions

Avg Daily hits	Total hits	Post title
3	352	Where to find country specific carbon emission factors?
2	283	What is the Global Warming Potential (GWP)?
2	200	What emissions cause global warming?
2	197	What are carbon emissions?

Conductors

Avg Daily hits	Total hits	Post title
4	2188	What are the most relevant physical properties for copper and aluminium in electrical applications?
1	696	Why is copper used so widely in electrical systems?
1	554	Are there other materials that can be used as electrical conductors?
1	547	What conductor to use for electrical wires in homes and offices?
1	520	Do copper and aluminium have about the same conductivity?
1	486	Are there more important criteria apart from conductivity and density?
1	483	What are typical examples for the application fields of both metals?

Earthing & EMC

Avg Daily hits	Total hits	Post title
2	877	But the standards deal with it! When I dimension my wiring according to latest EN standards, are there still any risks?
1	619	How can a dimmed incandescent lamp cause fundamental reactive power?
1	582	Is overheating the only risk with the neutral conductor and triple-n harmonics?
0	541	… but do the extraneous conductive parts not assist the return conductor carrying part of the return currents?
0	513	Just one central earthing point (CEP) – and how do I deal with multiple feedings?
1	469	Can one and the same non-linear load cause different levels of harmonic dissipation under equal operating conditions?
1	445	Conductor cross sections may have something to do with energy efficiency – but with power quality?
1	432	But the problem of harmonics will be solved as soon as EN 61000-3-2 takes effect!

Motors

Avg Daily hits	Total hits	Post title
0	1141	When should I downsize a motor to save energy?
1	725	Will a High Efficiency Motor (HEM) last as long as a standard efficiency motor?
1	625	Are their any differences in performance apart from the lower running costs?
1	540	Are HEMs really quieter?
1	455	Should I replace working motors with HEMs?
0	422	Is it possible to repair HEMs?
0	407	Where can I get HEMs from?
0	379	How easy are they to retrofit?
0	346	Do the small efficiency gains justify the effort?

Passive houses

Avg Daily hits	Total hits	Post title
1	748	Are passive houses expensive? (comparing to traditional house and low-energy house)
1	679	What are the main differences between low energy and passive houses?
1	638	How to construction an airtight building? How to avoid the most common leaks?
1	563	Are passive houses the homes of the future?
1	540	Is it possible to install a stove in a passive house?
1	521	What's a good ventilation strategy from an energy point of view?
1	503	Is it possible to make a passive house from a normal house?
1	484	Are there many passive houses in Europe?
1	472	Why airtight construction?
1	459	Can a passieve house be built everywhere?
1	456	What are the most important advantages of passive house?
1	406	Is it really so that passive houses do not require any heating at all?

Photovoltaics

Avg Daily hits	Total hits	Post title
2	162	What is a Solar Tracker?
2	145	What is an Inverter?
2	134	Can I sell excess solar electricity back to my utility?
2	126	How do I know what size PV system I need?
2	123	How much do PV cells degrade with rising/falling temperature?
1	108	What is photovoltaic technology?
1	96	What happens if the sun doesn't shine?
1	93	How do grid connected PV systems work?
1	89	What is a grid connected PV system?
1	79	Does my grid connected PV system have to include batteries?
1	79	Isn't PV electricity expensive?
1	77	How long has PV been around?
1	73	What is Net Metering?
1	71	What are Building Integrated photovoltaics?
1	68	I already have utility power, so why should I choose PV?
1	57	Can I use a grid connected PV system as a back-up source during a utility power outage?

Resilience & reliability

Avg Daily hits	Total hits	Post title
2	969	My datacentre has a UPS. Isn’t that enough protection?
1	421	I am installing two ‘fully rated’ transformers. Should I use one as a cold standby, or both simultaneously?
1	392	Many power users need high availability power supplies. Why can’t the distribution network operators provide them?

Transformers

Avg Daily hits	Total hits	Post title
4	2097	Why is the rating of transformers given in kVA and not in kW?
3	1215	What's the difference between a distribution and a power transformer?
2	1095	What's the difference between a distribution and an industrial transformer?
1	676	Do I need to specify a harmonic spectrum when buying a transformer?
1	588	What actions can manufacturers take to make transformers more efficient?
1	531	I know there will be harmonics, but don't know the spectrum
1	528	What will a manufacturer do if I do not specify loss evaluation factors?
1	482	Are high efficiency transformers also more reliable?
1	470	Why should the temperature in the transformer not become too high?
1	353	Is it necessary to replace all transformers by high efficiency ones?
2	305	What is the difference between a K-rated and a de-rated transformer?

Voltage disturbances

Avg Daily hits	Total hits	Post title
2	778	What is the difference between a voltage regulator and a Dynamic Voltage Restorer (DVR)?
1	388	My system suffers from voltage dips that appear to originate outside my installation. What can be done to resolve the issue?
1	378	My process control system is not reliable and I suspect a voltage dip problem. Where do I start?

Wind

Avg Daily hits	Total hits	Post title
4	223	How does a wind turbine make electricity?
4	216	Can I sell excess wind electricity back to my utility?
2	139	How long do wind turbines last?
2	135	Why don't they make turbines that look like old fashioned windmills?
2	130	Isn't Wind Energy electricity expensive?
2	112	Does my grid connected Wind Energy system have to include batteries?
2	104	What is Net Metering?
2	98	What is a grid connected Wind Energy system?
2	96	How much of the time do wind turbines produce electricity?
2	96	How many turbines does it take to make one megawatt (MW)?
2	95	Can I use a grid connected Wind Energy system as a back-up source during a utility power outage?
2	91	I already have utility power, so why should I choose Wind Energy?
1	84	What are wind turbines made of?
1	81	Are wind turbines noisy?
1	76	What about electrical interference?
1	72	Could I put a turbine in my garden or on the roof of my house?
1	72	How strong does the wind have to blow for the wind turbines to work?
1	67	What is wind energy?
1	66	Do wind turbines frighten livestock?
1	61	What is a wind power plant?
1	57	What happens when the wind stops blowing?

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