Modine Manufacturing DJE Installation And Service Manual page 14

P P E E R R F F O O R R M M A A N N C C E E D D A A T T A A
S S o o l l u u t t i i o o n n : :
1. Find the pressure drop curves for a size 100 both with and
without the air distribution baffle. (See curve 2, page 14.)
The solid line curves are for units with the air baffle
removed.
2. Enter the bottom set of curves in curve 2 at 2000 cfm and
read up the graph until the 2000 cfm line intersects the
pressure drop curves for the size 100. At those points read
to the left and find the pressure drop. For this example, the
pressure drop for a size 100 with 2000 cfm, and with the
air baffle in place, is approximately 0.65" W.C. The
pressure drop across the unit with the air distribution baffle
removed is approximately 0.13" W.C.
3. To find the air temperature rise for this example, enter the
top set of curves shown in curve 1 at 2000 cfm. Read up
the graph until the 2000 cfm. line intersects the
performance curve for a size 100. At the point of
intersection, read across to the left and find the air
temperature rise. For this example, the air temperature rise
is approximately 37°F.
1 1 4 4
C C u u r r v v e e 1 1
A A i i r r T T e e m m p p e e r r a a t t u u r r e e R R i i s s e e , , D D J J E E 7 7 5 5 , , 1 1 0 0 0 0
85
A A I I R R T T E E M M P P E E R R A A T T U U R R E E R R I I S S E E
80
75
70
65
60
55
50
45
40
35
(Example
40 Page 5)
75
25
20
.5 1 1.5 2
C C u u r r v v e e 2 2
P P r r e e s s s s u u r r e e D D r r o o p p C C u u r r v v e e s s , , D D J J E E 7 7 5 5 , , 1 1 0 0 0 0
2.4
P P R R E E S S S S U U R R E E D D R R O O P P
2.2
V V S S
C C F F M M
2
1.8
C C A A U U T T I I O O N N : : Do not
exceed 85 degree
temperature rise.
1.6
1.4
With Air
1.2
Baffle
1
8
6
4
2
0
.5 1 1.5 2
V V S S
C C F F M M
C C A A U U T T I I O O N N : : Do not
exceed 85 degree
temperature rise.
100
2.5 3 3.5 4
CFM x 1000
100
75
Without Air
Baffle
100
75
2.5 3 3.5 4
CFM x 1000
4.5
4.5