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Thanks for yoru help No1BEE, I can see how the ground electrodes are connected and that this doesn't form a problem. Yet there is an electrical path (through the bonding conductor) between the grounded conductor on the DC side and the grounded conductor on the AC side (especially visible on the...

Thank you all for your replies, but I still don't get it. Are you saying it's Okay to electrically connect one of the wires of an AC system to one of the wires of a DC system? Because that sounds very counter intuitive and possibly dangerous to me, maybe it's just me...

The only way you can trust the numbers (especially important if your going to use these prices in contracts) is by making your own database within your company. If you can work with some VBA, you can easily make a database and grow it along the way when you receive quotes from suppliers. No...

there are some decent online selector tools available, just google around. Important selection criteria that is often overlooked is the time required to start up the UPS. Some switch on in a fraction of a period, others are slower. Depends on your loads.

1C means a battery is fully charged/discharged in one hour. The C is a constant indicating the current needed to charge the battery in one hour. 0.5C means charged in 2 hours, 2C means half an hour.

Hi all, I am reading a book called Photovoltac Systems (by James P. Dunlop, I recommend it to everyone trying to get a better understanding on the subject). There is a part on grounding that I can't get my head around, I'v included a picture below that shows two possible lay-outs. The...

I am no expert in this field, but I think you need to make sure that the chiller is able to modulate. The VSD will change the air flow of the ventilator fitted on to your evaporator. This means the cooling drawn from your evaporator will fluctuate along with the VSD, thus your chiller will have...

OK, thanks for your answer!

Yes the diesel runs constantly, this is done to ensure that the extraction never ever stops (due to safety resons). Also note that the motor on the extractor is not the only consumer of the Diesel grid. I know there are specialized UPS solutions that will be much less energy consuming than the...

Thanks for your reply. To answer your question: No, the two grids are completely de-coupled (apart from the fact that two motors drive the same ventilator shaft)

Hi all, I'm having a problem understanding an extraction set-up. They have extractors that are used to keep labs constantly on a slightly lower pressure than atmospheric pressure to prevent leaks. To be absolutely sure that the extraction never stops there are two induction motors are fitted on...

Hi all, First post on this forum, so I hope I am posting it in the right place. Here goes... I am designing a system to recover heat from several gas streams coming from an oven. The problem is that most of these streams contain different small particles such as sugar (caramel) and different...