Trane CVHH CenTraVac, Инструкция по установке, эксплуатации и обслуживанию

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42 CVHH-SVX001G-EN
L =
0.214d
5
( P
2
0
– P
2
2
)
–
d * ln(P
0
/ P
2
)
fC
2
R
6f
ASHRAE Standard 15
• L = equivalent length of discharge piping, feet
• C
r
= rated capacity as stamped on the relief device
in SCFM (conversion: lb/min = SCFM * 0.0764)
C
r
= C C value in lb/min from the preceding table
• f = Moody friction factor in fully turbulent flow
• d = inside diameter of pipe or tube, in.
• ln = natural logarithm
• P
2
= absolute pressure at outlet of discharge piping,
psi (atmospheric pressure)
• P
0
= allowed back pressure (absolute) at the outlet
of pressure relief device, psi
P
0
= (0.15 P ) + atmospheric pressure
Table 14. “C” values used to determine rupture disk
vent line sizes (kg/s); for use with the
following figure
NTON
Evap.
Size
(EVSZ)
Cond.
Size
(CDSZ)
“C” Values for Unit Components
Total
“C”
Value
Evap. Cond. Econ.
Oil
Tank
900–1200 100M 100M 0.853 0.368 0.310 0.141 0.034
900–1200 100L 100L 0.939 0.415 0.349 0.141 0.034
900–1200 130M 130M 0.932 0.412 0.346 0.141 0.034
900–1200 160M 200M 1.022 0.461 0.386 0.141 0.034
900–1200 200L 220L 1.222 0.575 0.473 0.141 0.034
900–1200 220L 220L 1.284 0.637 0.473 0.141 0.034
1500–1700 200L 200L 1.195 0.575 0.435 0.151 0.034
1500–1700 220L 220L 1.295 0.637 0.473 0.151 0.034
900–1200 100M 10HM 0.967 0.368 0.424 0.141 0.034
900–1200 130M 13HM 1.053 0.412 0.467 0.141 0.034
900–1200 160M 20HM 1.144 0.461 0.509 0.141 0.034
1500–1700 200L 20HL 1.332 0.575 0.573 0.151 0.034
1500–1700 220L 22HL 1.458 0.637 0.637 0.151 0.034
Notes:
1 . Rupture disk diameter is 76.2 mm.
2 . Use the total “C” value in the following figure to determine the
vent line pipe diameter.
3 . If piping multiple rupture disks (multiple units) to a common
vent line, first determine the total “C” value for each unit, and
then; add all “C” values together and apply the result to the
following figure .
4 . The CVHH unit is a Simplex chiller and has (1) refrigerant circuit
and (1) relief device.
V Ve en ntt P Piip piin ng g