Velocity Edge GX325 Manual de usuario descargar pdf (Pagina 14)

*No number indicates that ﬂ uid passes through

all four holes in the plate.

Flow Down

Plate

Flow Up

Plate

Figure 17

Element composition diagram.

PASS AND FLOW ARRANGEMENT

A side

B side

Pass Arrangement

Positions 1 and 4, as shown above in Figure 17, are upper

connections, right and left respectively, and positions 2 and 3 are

lower connections, right and left respectively. Each vertical line

in between the “S” and “E” members represents a heat transfer

plate while the arrows show the directions of ﬂ ow in the channels

between two plates and in the port holes.

The position of a plate hole is indicated by the intersection

between a vertical line representing the plate and a horizontal

line indicating the ﬂ ow direction and passage. Holes for passage

of ﬂ uid ﬂ owing on the surface of a “B” plate are always located

on the left side (Holes 3 and 4), and holes for passage of liquid

ﬂ owing on the surface of an “A” plate are always found on the

right side (Holes 1 and 2).

In the element composition diagram (Figure 17), plate numbers

are shown in boxes as:

1 D1004 (“A” side)

1034 2 (“B” side”)

“D” in D1004 represents the plate adjacent to the “S” frame.

“D” also denotes that no ﬂ uid runs on the heating surface.

A box with no port hole numbers, 11 , in Figure

17 means 11 1234 . This is done for simplicity as most plates

in a unit have four holes.

Flow Arrangement

Figure 18 shows the plate arrangement in which “B” side is

arranged in two parallel channels with three passes in series

and “A” side is arranged in three parallel channels with two

passes in series. In two parallel channels with three passes in

series, the ﬂ uid ﬂ ow Q

ﬂ ows on the heating surfaces of two

plates separately (Q

/2) and gathers again in the port hole. This

operation is repeated three times. In the case of three parallel

channels, with two passes in series, ﬂ ow Q

similarly ﬂ ows on

the three heating surfaces separately (Q

/3), gathering once again

in the port hole.

The product of the number of channels in parallel, times the

number of passes in series, is always equal or different from each

other by one plate when comparing “A” side with “B” side. The

total number of plates can be obtained by adding the number of

“D” plates to the number gained by adding the products of “A”

side and “B” side. In Figure 18 (2 x 3) + (3 x 2) + 1 = 13.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 47 48

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Velocity Edge GX325 Manual de usuario Pagina 14

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