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   Long day today.  An other 10 hour work day so that I could get in all my hours and take Friday off for school.  Then I came home and fought with my laptop trying to get any kind of synchronization program to work.  My laptop stopped talking to the Blue Dragon, and I am thinking it has something to do with my new router (but I'm not sure).  Rsync refused to see changes and just wanted to copy everything.  At long last I got Unison setup and working, so I hope that takes care of that issue. 
   Pictured are the LED lights in my Cedar Rapids sleeping box.

June 07, 2011

Sleeping Box Designs

   Picture is the design (as it stands) for my new sleeping quarters I will be constructing at my home in Madison.  It is wider than any of my previous versions.  The inside width (except for the center support) is 4 feet (1.2 meters), and the bench top is 6 feet (1.8 meters).  The length is the same at 8 feet (2.4 meters), and the height our standard 33 inches (0.8 meters).  The reason for the additional space is the location--an open basement.  We have the room. 
   The top of the box has an overhang on both sides, the large one providing a work table.  My box in Beloit has a 1/2 inch (13 mm) sheet of OSB for the top.  I discovered it sags just a little bit.  So the plan for this box is to use 3/4 inch (19 mm) flooring plywood.  Because the span is greater than the 4 feet I can buy plywood, I will need two sheets.  This leads to a seam.  In my previous designs, I've always tried to avoid having a seam because it is an other location to leak in light.  However, the width of my box in Beloit has a 4' top, and a small overhang created by screwing on a 6 inch piece of plywood.  There is no seam inside the box, but the overhang is rather weak.  Also, my box from my second Cedar Rapids stay was exactly 4'x4'x8', and the seam on the edges was always a problem.  I had overcome this with 1"x2" boards and calk covering the seams, but it's a messy and anonying solution.  The better solution is a top that overhangs.  In my previous boxes, this requires a bead of calk and nothing more to keep out light.  In addition, I like to have an overhang to make it easier to work.
   While looking for supplies, I found a 3/4 flooring plywood with "tong and grove."  This allows the seam to overlap, and I can lay a bead of calk in the grove.  This should eliminate the leakage of light through the seam.  I also decided to add 1/8" (3 mm) Masonite hardboard on the top of the 3/4 plywood.  This should create smooth working surface.
   One item I think will be a nice addition to the new design is the addition of light traps for the ventilation duct-work.  The idea is to make light have to reflect as many times as possible before it can enter the box.

    Above is a cut-away picture showing the cavities used in the light traps.  The front side of the box is the exhaust.  Air enters the trap through the top vent from inside the box.  It then travels around around the maze until it reaches the vent at the bottom front.  Outside light would have to make no less than six reflections in order to enter the the sleeping chamber.
   The read trap is for intake.  Air enters from a blower on the top and then enters the sleeping chamber through two vents.  While there are not as many angles, the intake has less light to enter because it also has to enter into the fan.
   One concern with designing the light traps was to make sure they did not restrict airflow.  The mouth of the blower is about 7"x3", or 21 square inches.  The cavities in the light trap are 3 1/2" in depth (the height of standard 2x4 board).  I was careful not to have any gap shorter then 6 inches on the two paths, and 12 inches for a single path.  This means there is always 42 sq. in. available for air to move—exactly twice that of the mouth of the blower.  Our blower fan can move up to 2180 CFM (cubic feet per minute, 3704 cubic meters per second).  So that means the velocity of air at the mouth of the fan should be about 170 mph (274 km/h), and the speed in the trap should be 90 mph (145 km/h).  That's still fast, but that is a lot of air to move around.  The light trap will probably limit the total airflow to much less then what the blower can do.  But my current boxes all have poor exhaust opening, and plenty of air moves through them.  So having a better design should only help airflow.

1 comment has been made.

From Zam

Yer Mom

June 10, 2011 at 10:51 AM

I think you should add a linear actuator for the door, controled by an RFID reader. You can implant little glass RFID tag under the skin on the back of your hand. So then only you can enter with just a wave...
   A little video game action at Pluvius's house.  Picture by Xiphos.
   It was hot today—middle 90ies.  Rode by bike to work, and I would have much rather been on my bike in the strong wind then in a car.
   This is the "clean palette" in Xiphos's basement, which I will be taking over come September.  I vacuumed and mopped last weekend, and took some basic measurement.  This week I masked off windows using aluminum foil and foil-backed tape, and hung a sheet of black plastic along the wall.  I think I will probably paint the plastic like it did with my basement in Cedar Rapids.  I also took much more precise measurements of the basement which are accurate to about 1/2 inch, and modeled this in Sketchup.  I have an idea for my layout, but things were looking kind of tight--thus the better measurements.
   What I wanted to do this year on my birthday wasn't anything too grand: I wanted to eat a Pizza Pit pizza.  If my memory is correct, I had not eaten a slice of this pizza since my 16th birthday--so quite some time ago.  Here I am with my birthday request.  Picture by Tyson.

1 comment has been made.

From Liz


June 07, 2011 at 8:43 PM

glad you had a fun birthday! :D I had to work all day otherwise I probably would've tried to meet up. On a happy note the freecap word today is NINJA!
   Short week of work.  Monday and Tuesday were holidays, and Friday I have off.
   Pictured is an untouched picture from a few nights ago.  The sky had a red tint when using a long exposure.  I am pleased with the results.