| cooling in terms of m/sec over the hot components
Cooling airflow can be measured in many ways:
o volume of air moved -- cfm
o speed of air movement -- metres per second
Some components don't specify cfm for themselves,
but the air velocity over them in metres per second.
I think the over-riding problem with modern CRTs is:
o They are built down to a price
---- how they can contain the many components they do
---- and sell at such low prices
---- with margin for manufacturer + distributor + retailer
---- is incredible
o A fan is a cost component
---- which can be designed out
---- whilst designing it in loses margin with little mkting benefit
Vis., will customers buy a CRT with a fan or one without?
For many, they might actually prefer one without re noise.
What economic buyer population requires a CRT which can
tolerate far higher temperatures (40oC+ v spec'd at 30oC)?
Military may spec to 50-55oC ambient (Africa is 45oC right now),
but they are also likely to specify no fan re single-point-of-failure.
Frankly, I think most of the heat in a CRT is SMPS related:
o 200W consumed in total by the PSU
o 80% efficiency leaves 40W heat dissipation
o Bigger monitors might dissipate 60-100W
So the argument perhaps moves to PSU cooling.
Convection cooling can work, just depends how it is designed.