Category Archives: Helsinki Chamber

…And it’s been over a year again. In my defense, during that year we’ve been working pretty hard to get the Exactum Greenhouse to produce foodstuff, with more than moderate success. But this post is not about the Greenhouse or the chilies contained therein. This post is about the Nidec DR04XLG-12PUS1 dual fan units that have [...]

I confess to having had a bad case of writer’s block with this blog. Subsequently, there have been no updates for the past seven months. I’m correcting this issue now. The cause for the blog blackout has been a number of fan failures affecting a specific brand and model of servers in the Helsinki Chamber [...]

I contacted Halton‘s Risto Kosonen and enquired whether Halton would be interested in participating in our research. After a few phone discussions, Risto caught the idea and promised to consider it. Roughly a week from that, I got a call from Exactum‘s doorman. We had received quite a hefty package. The outdoors ventilation grille in [...]

After quite a lot of design work, I decided to ask Ville Hautakangas for help. Ville helped me to improve the design and solved most of the manufacturing problems. Our solution consisted of a “cover hat” for the exhaust chamber, similar in design to some ventilation pipes used in housing and appartment buildings. As materials, [...]

Over the past two months, we have encountered steadily raising temperatures within the prototype Helsinki Chamber. After some investigation, we had to conclude that both the exhaust and supply air flows were insufficient. During experiments, two interesting new phenomena occurred Supply underpressure, whenever the supply is unsufficient Exhaust overpressure, whenever the exhaust is insufficient During [...]

Even though my relationship with duct tape has been both long and amiable, it is pretty rare that I’ve had the pleasure of using duct tape for its proper purpose. The last time was on Feb. 11th, when we finally blocked the mounting holes surrounding the front panels of our rack servers. After this, we [...]

I wonder how hardy these stock issue CAT-5e/6 cables truly are? Ours has spent time outside since February 2010. The same cable has provided connectivity for the old tent and the new Helsinki Chamber. As you can see in the picture above, the cable is pretty much frozen solid. And yet: — 2001:708:140:410::10 ping statistics [...]

A new construction site will soon start just next to the Exactum building where the CS Department resides. A bunch of shielding experts visited the Dept on January 12th, 2011 in order to mitigate the effects of vibrations caused by the site’s demolition work. It is somewhat uncertain how much nearby explosions can harm mechanical [...]