Russell FVAC-101 User Manual
MultiCon
Air Cooled Fluid
Cooler
Catalog 410.3
February 1995
5 thru 216
Nominal tons
Vertical and
Horizontal
General
Russell's Multicon fluid coolers are designed to provide the optimum in heat transfer efficiency and are constructed for years of reliable
performance. Available in 45 sizes, the Multicon fluid coolers range in capacity from 5 to 216 nominal tons. Only the highest grades
of commercially available aluminum, copper and galvanized steel go into the manufacturing of each Multicon air cooled fluid cooler.
After assembly every unit is closely inspected before it is securely crated to ensure trouble free installation and operation.
Features
FAN / MOTOR
• All fans are sized for maximum ener gy efficiency, minimu m noise,
and are individually balanced to minimize vibration.
•All models have die stamped aluminum blades riveted to a
galvanized steel spider assembly.
• Fan guards are fabricated from heavy gauge steel wire and
epoxy coated
• On multiple fan units, all fans are baffled to prevent short-circuiting
of air during fan cycling.
• All FVAC motor assemblies are supported in all-welded, heavy
gauge wire support structures. The wire structures are zincchromate coated for corrosion prote ction.
• All motors have built in thermal protection.
OPTIONS
• Fan cycling control — available with contactors a nd e ither
ambient or fluid temperature sensors. Fan cycling, on double
width FVAC unit motors can be supplied with individual
contactors.
• Motor fusing—available on all models. Motors can be f used
individually or in pairs on double width units (not U.L. listed)
• Fins — available in four options; aluminum, copper, epoxy
coated aluminum, and baked phenolic coated aluminum.
• Motors are available in the following voltages:
FVAC 5 thru 19 - 208/230/1/60, psc. Option al 460/1 /60,
230/3/60 or 460/3/60. FVAC 22 thru 216 -
208/230/460/3/60, open drip-proof.
COILS
• Coil fins are manufactured from die formed corrugated
aluminum. The tubes are seamless 1/2" OD copper, arranged in
a staggered pattern and mechanically ex panded into the fins and
tube sheets for optimum heat transfer efficiency.
• Headers are produced from heavy wall copper tubing, and are
brazed to the coil using a high temperature brazing process.
• All coils are leak tested in an illuminated test tank at a pressure
of 380 psig.
• Hinged venturi panel(s) — can be provided on all FVAC
models to allow for easy coil cleaning of the coil fins and quick
access to the fan/motor assembly.
• Horizontal air discharge — available upon request for all
single width FVAC models. Contact Russell fo r details .
• Surge tank
• Fill valve assembly
Nomenclature
F VAC — 72 — 37
F — Fluid Cooler Circuiting
Design Series VAC Unit Size
Formulas
Eq.(1) Average Fluid Temp. = Eq.(4) Base Capacity (MBh/F) =
(Ent. Fluid Temp. + Lvg. Fluid Temp.) _______ Design Load (Btu/hr)
Eq.(2) Design Load (Btu/HR) = Eq.(5) Actual Capacity =
500 x GPM x (SpHt x SpGr) x (Ent. Fluid Temp. — Lvg. Fluid Temp.) Catalog Cap. x 1000 x TD x Cap. Corr. Factor x Alt. Corr. Factor
Eq.(3) TD = Ent. Fluid Temp. — Ent. Air Temp.
2 1000 x TD x Cap. Corr. Factor x Alt. Corn Factor
Eq. (6) Actual Pressure Drop =
Catalog Pressure Drop x Pressure Drop Corr. Factor
Selections
Given:
Altitude............................................................................. 5000ft.
Ambient Temp erature..........................................................100°F
Ent e ring Fluid Tem p e r ature.................................................. 140°F
Leaving Fluid Temperature................................................ 120°F
Flow Rate ........................................................................90 GPM
Ethylene Glycol Solution........................................................30%
Maximum Fluid Temp erature Pressure Drop.................15 ft. wg.
1 . Calculate the average fluid temperature using equation number 1.
Average Fluid Temp. = (140°F + 120°F)
2
Average Fluid Temp. = 130°F
2. Calculate the design load using equation nu mber 2.
Design Load (Btu/hr) = 500 x 80 x .940 x (140°F - 120°F)
Design Load (Btu/hr) = 752,000 Btu/hr
3. Calculate the fluid temp, difference (TD) using equation number 3.
TD = 140°F - 100°F
TD = 40°F
4. Determine the capacity correction factor from table 2.
Capacity correction factor = 1.027
5. Determine the altitude correcton factor from table 5.
Altitude correction factor = .89
Correction Factors
TABLE 1
SPECIFIC HEAT x SPECIFIC GRAVITY (Sp Ht x Sp gr)
% GLYCOL
CONCENTRATION
0
20
30
40
50
AVERAGE FLUID TEMP.
90 100 110 120 130 140
1.000 1.000 1.000 1.000
.967 .967 .967 .967
.936 .937 .938 .939
.887 .891 .894 .897
.854 .859 .862 .866
1.000 1.000
.966 .965
.940 .941
.899 .901
.869 .872
6. Calculate the base capacity using equation number 4.
Base capacity (MBh/°F) =______ 752,000
1000 x 40x1.027 x.89
Base capacity (MBh/°F) = 20.57
7. Using the performance tables number 6, select a model that
meets or exceeds the required base capacity at the required fluid
flow rate. Model FVAC-62 with 30 circuits w ill meet the capacity
and maximum pressure drop requirements.
8. Correct the fluid pressure drop using equation number 6.
Actual Pressure Drop = 13.6 x .963
Actual Pressure Drop = 13.1 ft.w.g.
9. Calculate the actual unit rating using equation number 5.
Actual Capacity = 21.54 x 1000 x 40 x 1.027 x .89
Actual Capacity = 787528 Btu/hr
10. Select the header connection size from Table 8. 2 1/2"
headers
with the same size mpt connections will be required.
TABLE 2
CAPACITY CORRECTION FACTOR
CONCENTRATION
% GLYCOL
0
20
30
40
50
90 100 110 120 130 140
1.069 1.074 1.078 1.083 1.089 1.093
1.026 1.031 1.040 1.046 1.051 1.057
0.998 1.005 1.012 1.021 1.027 1.033
0.966 0.974 0.984 0.992 1.000 1.007
0.930 0.939 0.951 0.961 0.970 0.979
AVERAGE FLUID TEMP.
TABLE 3
PRESSURE DROP CORRECTION FACTOR
% GLYCOL AVERAGE FLUID TEMP.
CONCENTRATION
0
20
30
40
50
TABLE 5
ALTITUDE CORRECTION FACTOR (ft)
ALTITUDE
FACTOR
90 100 110 120 130 140
0.869 0.860
0.991 0.963
1.075 1.037
1.121 1 .084
1.178 1 .140
SEA LEVEL 1000
1.0 0.98
0.850 0.841 0.832 0.813
0.944 0.925 0.907 0.897
1.009 0.981 0.963 0.944
1.056 1.028 1.000 0.981
1.103 1.075 1.056 1.037
2000
0.96
3000
0.93
TABLE 4
FREEZING POINT OF ETHYLENE GLYCOL
% GLYCOL FREEZING BOILING
CONCENTRATION TEMPERATURE TEMPERATURE
0 32 212
20 16 216
30 4 220
40 -12 223
50 -35 226
4000
0.91
5000
0.89
6000
0.86
7000
0.84
8000
0.82
9000
0.79
10000
0.77
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