What do you think?

Sidney · 28th October 2005, 17:13

In theory -

Background:
Our body generates heat; and our skin regulars the body temperature acting like a heatsink.

Condition:
Standing outside a building or house under calm condition (less than 5 Mph wind) in the shade versus standing inside a building with two windows and two fans directly opposing each other and blowing at the same direction at about 20 mph.

Question:
Do you feel cooler in the building or outside?

28th October 2005, 17:29

I think that depends what's the temperature.
My guess:
If the temperature is the same I think it might be colder inside.

Sidney · 28th October 2005, 17:31

Same temp condition

Different wind speed.

jmke · 28th October 2005, 20:43

more wind = feel colder

Sidney · 28th October 2005, 20:54

More wind = Feel colder = heat being removed from the skin = heat being removed from heatsink = higher thermal loss of any thermal generator

Sidney · 28th October 2005, 21:02

Put your hand in front of the intake fan of your PC; your hand feels "colder" from the draft drawing heat from your hand.

Put your hand in front of the exhaust fan; your hand may feel warmer; air blow across the case absorbs the temp from heat generator(s).

Just an 80mm fan will provide ~25-35 CFM; 2x80 = ~50 to 70 CFM in a case that is much smaller than a room; I have not figured out the velocity but it will certainly be higher than say inside a room where there is no wind speed to speak of. Otherwise, paper will be flying around.

Bottom line; a well vented case is far more efficient than open case.

jmke · 28th October 2005, 21:26

Quote:

Originally posted by lazyman

Bottom line; a well vented case is far more efficient than open case.

of course

who ever stated otherwise?

28th October 2005, 22:11

Quote:

Originally posted by lazyman
Bottom line; a well vented case is far more efficient than open case.

obviously, but an open case is easier to work with

Sidney · 28th October 2005, 22:15

Only if you need to test 50 heatsinks in a year

+ upgrading Vcard monthly
+ removing HDD out for "cleaning"
+ replacing power supply regularly just for fun

It serves no other purpose except "looking cool" in front of your peers and endangering yourself and others in the same room.

If my kids use open case PC, I would have asked them to move out before the house gets burnt down.

28th October 2005, 23:49

I recently bought a new case (Thermaltake Soprano) which has 2 120 mm fans and 1 92 mm fan. Still the temperature is 4-5° higher then when it's open.

It seems I got to reorganize my cables, I think.

28th October 2005, 17:13	#1
Sidney Member Join Date: Mar 2004 Posts: 15,738	What do you think? In theory - Background: Our body generates heat; and our skin regulars the body temperature acting like a heatsink. Condition: Standing outside a building or house under calm condition (less than 5 Mph wind) in the shade versus standing inside a building with two windows and two fans directly opposing each other and blowing at the same direction at about 20 mph. Question: Do you feel cooler in the building or outside? __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

28th October 2005, 17:31	#3
Sidney Member Join Date: Mar 2004 Posts: 15,738	Same temp condition Different wind speed. __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

28th October 2005, 20:43	#4
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,021	more wind = feel colder __________________

28th October 2005, 20:54	#5
Sidney Member Join Date: Mar 2004 Posts: 15,738	More wind = Feel colder = heat being removed from the skin = heat being removed from heatsink = higher thermal loss of any thermal generator __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

28th October 2005, 21:02	#6
Sidney Member Join Date: Mar 2004 Posts: 15,738	Put your hand in front of the intake fan of your PC; your hand feels "colder" from the draft drawing heat from your hand. Put your hand in front of the exhaust fan; your hand may feel warmer; air blow across the case absorbs the temp from heat generator(s). Just an 80mm fan will provide ~25-35 CFM; 2x80 = ~50 to 70 CFM in a case that is much smaller than a room; I have not figured out the velocity but it will certainly be higher than say inside a room where there is no wind speed to speak of. Otherwise, paper will be flying around. Bottom line; a well vented case is far more efficient than open case. __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

28th October 2005, 17:29	#2
agent #2 Posts: n/a	I think that depends what's the temperature. My guess: If the temperature is the same I think it might be colder inside.

28th October 2005, 22:15	#9
Sidney Member Join Date: Mar 2004 Posts: 15,738	Only if you need to test 50 heatsinks in a year + upgrading Vcard monthly + removing HDD out for "cleaning" + replacing power supply regularly just for fun It serves no other purpose except "looking cool" in front of your peers and endangering yourself and others in the same room. If my kids use open case PC, I would have asked them to move out before the house gets burnt down. __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

28th October 2005, 23:49	#10
agent #2 Posts: n/a	I recently bought a new case (Thermaltake Soprano) which has 2 120 mm fans and 1 92 mm fan. Still the temperature is 4-5° higher then when it's open. It seems I got to reorganize my cables, I think.