Recent content by marko2

Discussions above mention DNO supplies and Generators in the singular. Tier IV data centres will have 2N or 2N+1 for both DNO supplies and generators, and dual independent power feeding for all equipment. The workload is also typically active-active in at least two independent data centres, so...

As we know from the public enquiry for HS2 - which had large quantities of pro-forma objections, they're treated a s single view. In that case they all of the 'you're spoiling the countryside', not-in-my-backyard type opinions were dispatched in a single afternoon sitting.

I suspect the Auxiliary converters are specifically providing 415VAC three-phase - a convenient supply for drives in HVAC and catering equipment - or in a star configuration, providing several 240v single-phase AC supplies. Looking at data sheets on Hitachi Energy's website, it seems like 1kV...

"Noisy works between 7am and 10pm Monday to Sunday", yet the work is under an industrial estate. Or are the houses off across the other side of a railway line and Western avenue the ones they're worried about?

Remind me: what is the cost of a trackside signalling equivalent unit (SEU)? Access to a train in a depot is far easier, cheaper and safer than to the track.

If risk is transferred to the private sector, the contractor guesses their risk exposure and prices it in, and possibly hedges some of it. In this case, I'd imagine all of tier-1 contractors would not have hedged enough for the combined effect of inflation, the Ukrainian war and Brexit and be...

I'm doubtful that any member of the government is going to be keen to do that photoshoot - or be particularly welcome on site if they did.

FPK has seen a few improvements over the last few years, but none of these were holistic solutions to the ills of the station. There are now lifts to all platforms, and part of the original concourse has opened as a tunnel at street level. The lack of gates previously made it an attractive...

It kind of is - particularly Essex Road and Old Street stations (Moorgate got retiled a few years back). Just not the type of heritage anyone is clamouring to keep.

It seems that the standard CLASP system had timber roof and floor decks up to Mk4 of the system, and Mk5 (from late 70's onwards) used pre-cast concrete panels. The floor and roof decks bolted together and to the frame to form a diaphragm, forming an intrinsic part of the structural integrity...

From the Guardian Article, we note that NIMBYs are out in force. “We have been predicting that something like this would happen for the last 10 years,” Jennings said. “We have been giving a consistent message to HS2: ‘Don’t tunnel through chalk, it’s unstable.” Is chalk inherently less stable...

With an Absorption chiller. These are common enough in co-generation plants (in large buildings, particularly hospitals). They can use low-grade waste heat to drive a cooling cycle. Both steam and diesel locomotives have plenty of waste heat that would otherwise get vented to the atmosphere.

London's Temple of Mithras is right next to the Bank station entrance on Walbrook

Making the a shaft a third bigger to accommodate a fourth escalate increases the volume needing to be excavated by a little more than 1.75 times. Building another escalator shaft - at twice the volume - now looks attractive as it can hold another three escalators. 1669248461

Indeed, but there are people out there - such as Chris Packham, willing to clutch at more straws than an onanising scarecrow. They'll no doubt continue until the project is complete. It will be fascinating to see whether they make use of the new services. If the government is serious about...