====== Group Minutes / Work log ======

===December 4, 2010===
  * Unordered List ItemCardboard mock-up made
    * looks larger than expected
    * move fillport hole?
    * how does the top swing out?
    * rubber feet on bottom?

[[http://db.tt/AomA88Y | Temporary location for pictures]]

===November 29, 2010===
  * HWLabs SR1 360 Radiator arrived
  * Swiftech MCP-655 Pump (Laing D5) arrived
    * (Thanks to Jshay @ [H]ard Forums)

  * Microcenter seriously messed up my order of barbs
    * We have G1/2 barbs now...
    * Need to reorder another batch of G1/4 barbs

===November 28, 2010===
  * 90 & 45 degree fittings are too overpriced (cheaper ones are sold out)
  * will bend tubing instead
    * use zip ties if it kinks

===November 22, 2010===
Draft of writeup complete

Need to do:
  * Rubber Feet?
  * Electrical mounts
  * Top panel hinges
  * Structure joints for all panels
  * Convert Panels to CAD 

[[File:mock1_1.jpg|thumb|300px|Current cooling system design.]]
  * 6x 120mm fans (Assumed to be Yate Loon D12SH-12)
  * Laing D5 / Swiftech MCP-655 Pump
  * EK MultiOption RES 150
  * 10x 1/2" ID Barbs
  * 2x HW Labs 360 Radiators (Models to be verified)
  * T Block (Possible switch to Q Block)
  * Bitspower Temperature Sensor
  * 2x 90Degree Elbows (Or barbs)
  * 2x 45Degree Elbows (Or barbs)
  * 2x Bitspower G1/4" F/ F Pass-Through Fitting
  * 5/8" OD 1/2" ID Tygon Tubing

===November 21, 2010===
  * Researched a possible alternative laser cooling system: CW-3000 Industrial Cooler
    * Link to e-bay [[http://compare.ebay.com/like/370438043647?ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=171904412182&crlp=1_263602_304662&UA=WVF%3F&GUID=6f11de0e12c0a0e2044378d3feb9a523&itemid=370438043647&ff4=263602_304662 | here]].
    * Link to a slightly more informative page [[http://laser-tube.en.made-in-china.com/product/IopJRnEHOXVd/China-Industrial-Laser-Cooler-Water-Chillier-MT-CW3000-.html | here]].

Costs $180 according to:
[[File:Price_list.pdf]]

===November 18, 2010===
  * Finalizing designs on Google Sketchup
  * Ordered pump & 1 radiator
    * This radiator is of a different brand than the one designed for (less heat dissipating potential but is essentially the same dimensions)
    * $100 for both via [H]ardForum user "Jshay" ~Thanks

Need to:
  * Research proprietary laser chillers
  * convert acrylic walls in Sketchup to AutoCAD

Todo:
  * panel mounts for
    * electronics connections
  * Tubing

===November 9, 2010===
*Moving along with the cooling design in Google Sketchup
*Checking with electronics group to see if we've given them enough space in the PSU compartment
[[File:Electdimensions.png|thumb|300px|Current cooling system design.]]

Todo:
  * panel mounts for
    * Fillport
    * electronics connections
  * Tubing

===November 9, 2010===
Messaged the user "love-happyshopping" on ebay regarding more technical specs on the laser, specifically, the operational temperatures of the laser. This is the user's reply:

''1.Sorry, we do not have digital copy of the manual for this item. You can see the description from the following link:''

[[http://cgi.ebay.com.hk/ws/eBayISAPI.dll?ViewItem&item=370395525294 | Laser Manual]]


Technical Parameters
  * Power output(W)：40
  * Wavelength:10600nm
  * Length（mm）：700
  * Cooling System: Water Cooling.
  * Triggering voltage(KV)：22
  * Operating voltage(KV)：15
  * Operating current(mA)：18

''2.The performance of the laser have no request for temperature.''

So we still do not have a precise goal of cooling 500W. The groups feels that the current setup of 2x(120.3) rads + 6 fans should be enough. It already has a second layer of safety (having 2 radiators rather than just 1).

love-happyshopping

===November 8, 2010===
Numbers!
According to the vendor on [[http://cgi.ebay.com/NEW-40W-CO2-LASER-POWER-SUPPLY-ENGRAVER-ENGRAVING-/230486852305 | Ebay]]:
  * Maximum output voltage:DC 25KV.
  * Maximum output current: DC 20mA.
    * Therefore, max power = 25KV*20mA = 500W

According to [[http://skinneelabs.com/pa120.3.html?page=4 | Skinnee Labs]]
  * Using a single Thermochill PA120.3 with 3 pull fans
    * The delta between ambient air and avg water temp will certainly be below 10C

We plan to use:
  * 2 radiators: TA120.3 which should be better than PA120.3's
  * 6 fans in a push pull configuration for each radiator
    * These fans correspond with the blue trend line on Skinnee's graph, but we will have twice as many fans

I estimate that with 2 of these radiators with a 6-fan push-pull configuration each, we will have a temperature delta of around 4C between ambient air and avg water temperature.
'''Still need to find out the safe and optimal operation temperatures for the laser'''

===November 5, 2010===
  * Spoke to graduate student, Wei Dai
    * Our design is sound and legit
    * Discussed some hand-calculations
    * Need to find the operational temperatures of a CO2 laser
  * Start planning the enclosure for the cooling

Emailed several companies for sponsorships / discounts
  * Most declined
  * Thermochill gave a somewhat promising response

===October 20, 2010===
  * Presented on possible [[Cooling System|cooling system]].
  * Decided on water cooling.
    * Open loop could be a temporary solution.
    * Closed loop would be a better final solution.