December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
475Power Converter Cooling
where watts = equipment power loss transferred to water; L = total length of cooling
tube in one series path (m); θ = mean temperature difference, θ
tube(constant)
− θ
water(average)
(°C); V = velocity of water in tube (m/s); and D = inside diameter of cooling tube(cm).
In terms of the water quantity ow rate Q in liters/minute,
Q
DV
V
Q
D
=×=
π
π
(/)
.
2 100
1000
60
15
2
2
or
. (17.17)
Using Equation 17.17 in 17.16, we obtain
Watts
148 2
15
42 9
8
L
Q
D
Q
D×
=
××
=
θπ
.
.
.
.0
0.8
Therefore,
liters
minute
watts
42.9
Q= =D
L ×
θ
1.225
(17.18)
watervelocity 0.212
liters/minute
m/s
cm
2
V=
D
. (17.19)
The left-hand side of Equation 17.18 suggests that ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.