| Article | Rating | Usefulness | Remarks |
|---|---|---|---|
| Part L by J Field | E | Great stuff, John. Found it via Vilnis\' website. | Will need updating as more details of the implementation of the EU EPBD emerge. Note dofferences emerging im above i,plementation in Scotland ... David |
| Part L by J Field | E | Yes, this is a useful summary of the changes. As part of my dissertation i am looking at the implications of part L, and as you will be aware there are pages and pages of ODPM docuuments etc which are difficult to digest. Any advice you could provide would be appreciated. Regards Craig Sharp craig_sharp1980@hotmail.com | An update on the SBEM calculation could be provided to assess the effectivness of this tool - in particular will these lead to a relaxation of certain criteria due to lack of training and planning of the roll out process? |
| Motors_drives | E | ||
| Motors_drives | G | It gave some generally useful pointers. | You could mention that VF (variable frequency drives), coupled with prudent equipment selection can allow you to eliminate belt drives in things like pumps. VF drives are much more cost effective and more reliable than they were even as little 10 years ago (so many experienced electrical engineers are remain unreasonably wary of them). A VF drive (also known as VSD - variable speed drive or sometimes VVVF variable voltage variable frequency) typically has an energy efficiency greater than 98%, compared to 95% for well maintained vee belt drives, and save you the hassle of looking after belts. A VF drive also gives you soft starting, soft stopping and sometimes electrical power factor correction as well. |
| Motors_drives | V | There is good advice here, but how do you spot it? | There are two major errors in this article. Under \"quick hits\" the calculation on motor power is incorrect as it does not take into account power factor. This can vary from almost zero to close to unity depending on the motor and load. Under \"Further information\" (on VF drives)- this is utter rubbish. As long as an induction motor has Class F insulation there is not usually any problem with running it on a variable frequency drive even down to 5 or 10 hz, although as the best savings are on fans and pumps due to the cubic relationship between their speed and power demand there is little point in running as slow as this. I know of numerous induction motor/VSD installations that run happily for weeks at low speed (saving a fortune!) Nick Osmaston Independent Energy Management Consultant. 01752-568189 nick.osmaston@btinternet.com PS. Vinis, you may not want to include this verbatim, but feel free to give me a call to discuss if you wish. Nick Osmaston |
| Voltage | F | I think it would be a good idea to add a note of caution when operating tap change units on transformers. Very few transformers have on-load tap change units. If you try and alter a tap change on line then catastrophic failure could occur. Phil Proctor Dupont Teijin Films (Senior authorised HV electrical engineer) | |
| art-othercontrols | E | ||
| Motors_drives | - | ||
| Fabric | F | Test | Test |
| Voltage | E | For lightly loaded industrial motors we neednot stick to standard nameplate voltages and may reduce the voltages to the derated capacities of the underloaded motors | Losses in the associated voltage reduction devices to be included before arriving at actual energy saving ( Net savings) |
| Voltage | G | All of it | |
| Fabric | E | great examples! very clear. | |
| Fabric | E | There are lots of people out there professing to know about part L and the problems accociated with ADL2B in particular. This site actually explains the mysteries of U values and calculating heat loss/potential savings in a breathtakingly simple way. I have saved my client a small fortune, thanks. | |
| hvaccontrols | V | ||
| Voltage | F | on a manufacturing site, lowering the voltage could burn out the motors, as motors will tend to pull more current for the same load if the voltage is reduced. | |
| .137.195 | 83.137.226.19 | 83.137.226.19 | |
| Heat_recovery | - | ||
| Voltage | - | ||
| Comp_air | G | People think that it is free just about sums it up! | The author mentions both leakage and unnecessary use as opportunities for saving energy. In principle this is of course correct, but in many cases the output of air from the compressors is not proportional to the electricity input. In other words, the generation efficiency is both low and variable. If the effect of reducing leakage or consumption is to lower generation efficiency, then the potential savings will not be realised. To give an example, I recently surveyed an industrial site with a number of compressors each rated at about 75-kW. I determined by inspection that one was running unnecessarily, and by energy analyser that it was drawing 73-kW. When the compressor was pneumatically isolated the load dropped.....by just 5-kW! This is not an isolted incident - on virtually every multiple compressor installation I look at there are control deficiencies that mean that simple leakage reduction measures will not produce pro-rata, or indeed any savings in energy consumption. Even quite fancy centralised control systems do not always produce a perfect result - I have also seen variable speed compressors running as the \"lead\" machine (at full output) with a fixed speed unit on and off-loading to top up the system. Compressors off-load mechansms are ofen defective, and compressors run off load for long periods of time unnecessarily. The quickest and easiest way of saving money on your compressors may be to improve the control, and the best way to find out is to monitor their individual electricity demand for at least a week using energy analysers. This may sound demanding, but the potential rewards are huge, and at the end of the day you pay for what goes into a compressor, not what comes out of it! Nick Osmaston Independent Energy Management Consultant nick.osmaston@btinternet.com |
| hvaccontrols | E | Optimum-start control | Information about suppliers |
| Voltage | E | As an electrical engineer and energy consultant it confirmed what I know. | Powerperfectors website claims, I believe spuriously, that tap changing doesnt work and can lead to increases in consumption. It quotes a case where this occurred |
| Voltage | G | ||
| hvaccontrols | E | Conciseness, accuracy, and information organization | |
| 28.52 | |||
| Part L by J Field | F | 6rtnFO bnnjndtllmbm, [url=http://uijefqpswsdq.com/]uijefqpswsdq[/url], [link=http://ucanmiiypirt.com/]ucanmiiypirt[/link], http://brltlnfwveat.com/ | 6rtnFO bnnjndtllmbm, [url=http://uijefqpswsdq.com/]uijefqpswsdq[/url], [link=http://ucanmiiypirt.com/]ucanmiiypirt[/link], http://brltlnfwveat.com/ |
| Heat_recovery | E | ||
| hvaccontrols | E | I found that it is not easy to get information about where to locate sensors in the house (for mech vent). In one house i saw T sensor near heating source- that didn\'t seem very cleaver. I need to write essay about sensors in vent, where to locate those and so on. Thanks. | There could be some drawings with examples added. |
| Heat_recovery | - | ||
| Voltage | V | 409e1aa7ac13cdc6f1badd533bf48765 http://njdokj.info/27a39a468af882ec1daf434fe3c9567b/409e1aa7ac13cdc6f1badd533bf48765 http://njdokj.info/27a39a468af882ec1daf434fe3c9567b/409e1aa7ac13cdc6f1badd533bf48765 [url]http://njdokj.info/27a39a468af882ec1daf434fe3c9567b/409e1aa7ac13cdc6f1badd533bf48765[url] | 409e1aa7ac13cdc6f1badd533bf48765 http://njdokj.info/27a39a468af882ec1daf434fe3c9567b/409e1aa7ac13cdc6f1badd533bf48765 http://njdokj.info/27a39a468af882ec1daf434fe3c9567b/409e1aa7ac13cdc6f1badd533bf48765 [url]http://njdokj.info/27a39a468af882ec1daf434fe3c9567b/409e1aa7ac13cdc6f1badd533bf48765[url] |
| hvaccontrols | F | 5cb3df7dae82801146e8a88ff9c2f8b8 http://njdokj.info/b92c294eda67f9e98ffd2fb7ec635035/5cb3df7dae82801146e8a88ff9c2f8b8 http://njdokj.info/b92c294eda67f9e98ffd2fb7ec635035/5cb3df7dae82801146e8a88ff9c2f8b8 [url]http://njdokj.info/b92c294eda67f9e98ffd2fb7ec635035/5cb3df7dae82801146e8a88ff9c2f8b8[url] | 5cb3df7dae82801146e8a88ff9c2f8b8 http://njdokj.info/b92c294eda67f9e98ffd2fb7ec635035/5cb3df7dae82801146e8a88ff9c2f8b8 http://njdokj.info/b92c294eda67f9e98ffd2fb7ec635035/5cb3df7dae82801146e8a88ff9c2f8b8 [url]http://njdokj.info/b92c294eda67f9e98ffd2fb7ec635035/5cb3df7dae82801146e8a88ff9c2f8b8[url] |
| Fabric | E | Well done Mr.Vesma, Please, is it eny chance that we can add some different materials in U-value calculator? | |