26
Figure 34 - Condenser Located Below Chiller Unit
Caution: Liquid line sizing for each chiller capacity is in Table 6. These line sizes are listed per circuit and apply where
leaving water temperature (LWT) is 40°F or higher. For applications where the LWT is below 40°F, size lines using the
ASHRAE Refrigeration Handbook or other suitable design guide.
Determining Equivalent Line Length
To determine the appropriate size for field installed
liquid and discharge lines, it is first necessary to
establish the equivalent length of pipe for each line.
The equivalent length is the approximate friction loss
from the combined linear run of pipe and the
equivalent feet of elbows, valves, and other
components in the refrigeration piping. The sum
total is the equivalent length of pipe that would have
the same pressure loss. See the ASHRAE
Refrigeration Handbook for more information.
Follow these steps when calculating line size:
1.
Start with an initial approximation of equivalent
length by assuming that the equivalent length of
pipe is 1.5 times the actual pipe length.
2.
Determine approximate line sizes by referring to
Table 6 for liquid lines, Table 7 and Table 8 for
the discharge lines.
3.
Check the line size by calculating the actual
equivalent length using the equivalent lengths
as shown in Table 5.
CAUTION: When calculating the equivalent
length, do not include piping of the chiller unit.
Only field piping must be considered.
Chiller
10' MAX
