publicENEMY Wrote:how can the two case that you mention any better than the fanless wesena? afaik, the wesena case is also "designed and built with heat pipes connects to the case shell".

mclog Wrote:Where do you see this info? I was reading the Wesena installation guide and there's no description of heat pipe installation in there.

mclog Wrote:Looks good sir! Very snappy, especially looking at it with my ATV2 eyes. Time to build methinks =)

Balinus Wrote:Let me chime in the debate about the heat, aluminum and steel.

Fourier's law that considers heat transfer is :

q = k A dT / s

where q is the quantity of heat transferred (units:W), k the thermal conductivity of the material (be it steel or aluminum) (W/m.K), A is the heat transfer area (m^2), dT = temperature difference across the material and s = material thickness (m).

So, let's consider that the case dimension are similar. Doing so, temperature inside the case and outside the case (dT), area (A) and thickness numbers are not important. In other words, le's say that aluminum is "number 1" and steel is "number 2" in the following equations :

q1=k1*A1*dT1/s1
q2=k2*A2*dT2/s2

As said earlier, we have a similar case, but of different material.Which means that A1=A2=A, dT1=dT2=dT and s1=s2=s. Replacing these values in both equation gives :

q1=k1*A*dT/s
q2=k2*A*dT/s

Then, we look at the ratio q1/q2, it gives a simple direct answer (A, dT and s cancels out, as they have equal values):

q1/q2=k1/k2.

Thermal conductivity of aluminum is 250 W/m*K and for steel (with 1% carbon) is 43 W/m*K and 16W/m/K for stainless steel. So, the ratio of q1/q2 gives:

q1/q2=5.8, for steel with 1% carbon and
q1/q2=15.6, for stainless steel.

Under similar load, the aluminum case will dissipate heat 5.8 and 15.6 times faster than steel (1% carbon) and stainless steel respectively.

So, under any given "impulsion" of X Watts towards the case (from heatpipe or air inside the case, or...?), the aluminum case will dissipate the heat faster, as Fourier's law tell us.

publicENEMY Wrote:http://www.wesena.com/pro_show.asp?id=196

from what i understand, bluray meant to say that the serener solution is a better solution than wesena. ive seen people(thread) that successfully uses wesena case as htpc, but cant find anything about serener.

i looked into all(almost) fanless solution for htpc. wesena/streacom, atech fabrication, hfx, habey, couple other i forgot.

wesena is one of the better(afaik, none is perfect)

Balinus Wrote:Let me chime in the debate about the heat, aluminum and steel.

bluray Wrote:There is no debate between aluminum and steel cases. With proper case (case with heatsink/heat pipes), it'll transfer/dissipate heat through the case heatsink shell. You're correct that aluminum dissipate heat faster than steel!

Balinus Wrote:oh my bad then! I thought there were some kind of a debate earlier in the thread.

voip-ninja Wrote:Yes, there was. I had pointed out that the aluminum Wesena case acted as a passive heatsink to some extent and dissipated more heat than steel cases and there were some here *cough cough bluray* who seemed to be indicating that this is not the case.

Thanks for proving my point, with Math!