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COOLING TOWERCELLS
- FIBERGLASS UNITS -
INSTRUCTIONMANUAL
I.O.M. #054 6/99
• INSTALLATION• OPERATION• MAINTENANCE
TEMPTEK, INC. 525 East Stop 18 Road Greenwood, IN 46142phone: 317-887-6352 fax: 317-881-1277web site: www.temptek.com e-mail: [email protected]
TEMPTEK, INC.525 East Stop 18 RoadGreenwood, IN 46142
Page: 12TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.1 T45P PHYSICAL
3" SCHED 40PVC
WATER INLET
1140 RPM3 HP TEFC
4" PVC SLIP FLANGEWATER OUTLET
48 3/4"
59 1/2"
19 3/8"
13 3/4"
8 11
96"
126"
137 1/2"
1"9"
1"
9"
TYPICAL MTG. HOLE LAYOUTALL HOLES 5/8" DIA.
‘TP’ Fiberglass Tower Cells
Page: 13TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.2 T85P PHYSICAL
WATER OUTLET6" PVC SLIP FLANGE
ALL HOLES 5/8" DIA.TYPICAL MTG. HOLE LAYOUT
9"
1"
9"1"
19"
29 1/4"
5 HP TEFC1160 RPM
WATER INLET4" SCHED 40 PVC
137 1/2"
126"
96"
11"8"
84"
72 1/2"
‘TP’ Fiberglass Tower Cells
Page: 14TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.3 T135P PHYSICAL
WATER OUTLET6" PVC SLIP FLANGE
TYPICAL MTG. HOLE LAYOUTALL HOLES 5/8" DIA.
1"
9"
1"9"
19"
35 1/4"
7.5 HP TEFC870 RPM
WATER INLET4" SCHED 40 PVC
96"
8" 11"
96"
126"
139 1/2
84 1/2"
‘TP’ Fiberglass Tower Cells
Page: 15TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.4 T170KP PHYSICAL
1160 RPM5 HP TEFC
121"
8 PLACES3/4" DIA.6" 12"
81 1/2"84"
19"
1 1/4"
11"
137 1/2"
126"
96"
8"
145"
72 1/2"
BOTH SIDESHOISTING TABS
6" SCHED 40 PVCWATER INLET
10" PVC SLIP FLANGEWATER OUTLET
‘TP’ Fiberglass Tower Cells
Page: 16TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.5 T270P PHYSICAL
BOTH SIDESHOISTING TABS
10" PVC SLIP FLANGEWATER OUTLET
6" SCHED 40 PVCWATER INLET
870 RPM7.5 HP TEFC
8 PLACES3/4" DIA.
93 1/2"96"
19"
1 1/4"
139 1/2"
126"
87"
8"
169"
84 1/2"
6" 12"
145"
11"
‘TP’ Fiberglass Tower Cells
Page: 17TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.6 T405P PHYSICAL
BOTH SIDESHOISTING TABS
8 PLACES3/4" DIA.
SLIP FLANGE2 @ 10" PVCWATER OUTLETS
2 @ 6" SCHED 40 PVCWATER INLETS
870 RPM7.5 HP TEFC
93 1/2"96"
19"
1 1/4"
160"
139 1/2"
126"
87"
8"11"
40 3/4"84 3/4"
253 1/2"
12"84"
‘TP’ Fiberglass Tower Cells
Page: 18TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
2.7 T540P PHYSICAL
7.5 HP TEFC870 RPM
WATER INLETS3 @ 6" SCHED 40 PVC
WATEROUTLETS
3 @ 10" PVCSLIP FLANGE
3/4" DIA.8 PLACES
HOISTING TABSBOTH SIDES
84"84"
12"
338"
85"
78 1/2"
11"8
87"
126"
139 1/2"
169"
1 1/4"
19"
96" 93 1/2"
‘TP’ Fiberglass Tower Cells
Page: 19TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
3.0 INSTALLATION3.1 ASSEMBLY AND RIGGING INSTRUCTIONS3.2 TYPICAL TOWER CELL SUPPORT STAND3.3 TYPICAL 1-PUMP TOWER SYSTEM CONFIGURATION3.4 TYPICAL 2-PUMP TOWER SYSTEM CONFIGURATION3.5 TOWER STAND MOUNTING OPTIONS3.6 TYPICAL VACUUM BREAKER3.7 TYPICAL PRESS DROP3.8 EXPANDABLE TOWER CELL INSTALLATION3.9 RECOMMENDED OPERATION AND MAINTENANCE SCHEDULE
‘TP’ Fiberglass Tower Cells
Page: 20TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
3.1 ASSEMBLY AND RIGGING INSTRUCTIONS(APPLIES TO T35P, T75P & T120P)
SELF-SUPPORTING BASES HAVE PRE-DRILLED HOLESFOR MOUNTING TO LEG EXTENTIONS THAT ARE TOPPEDWITH A 10" X 10" X 1/2" HRS PLATE.
A MINIMUM DISTANCE OF 24" IS RECOMMENDEDBETWEEN ADJACENT TOWER CELLS.
24 MIN.
GENERAL DETAILS
TOWER CELLS ARE SHIPPEDLYING DOWN ON SKID.
SKID
WHEN CELL IS STOOD UP ONBASE, BOTTOM SEAM MUST BEIN SPACE BETWEEN TOP CHANNELS.
STEEL BASE
STEP 1:PREPARING THE CELL FOR INSTALLATION
STRAP OR ROPE
USE EXTREME CAREWHEN LIFTING TOAVOID DAMAGING CELL.
MANY POSSIBLE METHODS EXISTFOR LIFTING CELL ONTO BASE.THIS DIAGRAM SHOWS ONE OFTHESE METHODS.
STEP 2:LIFTING CELL FROM SKID ONTO BASE
CELL
INLET FRAME
BASE
MOUNTING TABS
AFTER CELL IS STANDING ON BASE, LOOSEN BOLTSAT "A" AND ROTATE MOUNTING TABS INTO POSITION.MARK HOLES TO BE DRILLED AT "B" AND DRILL3/8" DIA. HOLES.
ONCE BOLTS ARE TIGHTENEDSECURELY SEAL ENTIREASSEMBLY WITH SILICONE.
AFTER HOLES ARE DRILLED, PUT A BEADOF SILICONE AROUND HOLE; PRESS WASHERINTO SILICONE AND ADD ANOTHER BEADOF SILICONE TO THREAD NUT INTO.
STEP 3:ATTACHING CELL TO BASEAND SEALING FASTENERS
PRESS INLET LOUVERS INTO INLET FRAMES.BE SURE TO PUSH THEM ALL THE WAY INAS SHOWN AT LEFT. THE LONG SIDES ARE AN INTERFRENCE FIT.) THEY MUST BE PUTIN SO THAT THE INSIDE ANGLE IS POINTINGDOWN. THEY SHOULD FIT TIGHTLY.
INLET LOUVERS
CELL WALL
INLET FRAME
LOUVER
INLET CONNECTION
STEP 5:INSTALLING LOUVERS
ONCE CELL IS ASSEMBLED, ITMUST BE KEPT UPRIGHT ANDBE LIFTED ONLY BY THE STEELBASE. SHOWN IS ONE METHODFOR OVERHEAD LIFTING.
A FORK LIFT MAY ALSO BEUSED TO LIFT AND TRANSPORTTHE CELLS. USE CAUTION TO AVOIDDAMAGING THE FIBERGLASS.
STEP 6:HOISTING CELL FOR
PLACEMENT ON
STAND OR
ROOF
WHEN LIFTING FAN/MOTOR ASSEMBLYONTO TOP OF CELL, BE SURE TO BALANCE WEIGHT TO AVOID TIPPING.
AVOID BUMPING ANYTHINGWITH ALUMINUM FAN BLADES.
MOTOR
FAN
DRIFT ELIMINATOR
INSIDE LEG OF RING WILLFIT INSIDE TOP OF FIBER-GLASS CELL BODY.
STEP 4:SETTING FAN UNIT ASSEMBLY
NOTE: this step may not berequired on some models.
‘TP’ Fiberglass Tower Cells
Page: 21TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
3.2 TYPICAL TOWER CELL SUPPORT STAND
137"137" 137"E
SEAMLESS CARBON STEEL
4" SCHED. 40 PIPE
LC
LC
LC LC
OP. WT.
SHIP WT.
4200 lbs1950 lbs
3100 lbs1580 lbs
1470 lbs1100 lbs
108"100"85 1/2"
100"92 1/2"81"
86"74"49 1/2"
74 1/2"62 1/2"38 3/4"
D
C
B
A
T85P T135P T45P
6"x8"x3/8" HRS
2"x2"x3/16"xC2"x2"x3/16"xD
LC
LC
1/2" HRS
5/8"
10"
1"
1"
10
E
8"
121"
AB
72"
36"
‘TP’ Fiberglass Tower Cells
Page: 22TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
3.3 TYPICAL 1-PUMP TOWER SYSTEM CONFIGURATION
SEE TECHNICALSPECIFICATION SHEET#01 - "TYPICAL PROCESSCONNECTIONS"
SLOPE 10%MIN.
14
11
10
13
12
22
26
18
21
1920
23
24
27
28
30
29
65
7
8
9
17
15
25
3132
33
34
35
36
37
3
4
2
1
16
Component descriptions and generalinstallation notes listed on next page.
‘TP’ Fiberglass Tower Cells
Page: 23TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
ONE PUMP TOWER SYSTEM* Items included in typical TTS^ Items supplied by owner1* tower fan motor2* tower cell3^ tower flow control valve4^ capped tees for future expansion5^ tower return line to tank: 8-10” from bottom of tank6* tank - process side7* pump tank assembly8* angle iron tank banding - increases slenderness ratio9* tank insulation - recommended for out-door applications in freeze areas10 tower pump starter11 tower fan starter12 tower fan thermostat13 tower pump thermostat14 pump deck - optional mounting platform15^ to plant open drain16^ capped pump port (future expansion)17^ tank drain18* tower pump suction valve19* tower pump discharge valve20* tower pump21^ tower pump discharge pressure gauge22* tank divider: baffle23* plugged port (use for water level switch)24* plugged port (use for water make-up supply)25* overflow port26^ check valve - required only if header system is run above tank level... to retain water in
piping during shut down27^ tower bleed valve - set @ 2 GPM per ton of tower28^ emergency operation drain valve29^ main header valve - from process30^ main header valve - to process31^ emergency operation water supply valve32^ from plant water service33^ valves at header branches to provide service flexibility and balance flow34^ tees at existing and future machine drops35^ system balance valve - sized per system capacity. Use CASH ACME K-20, K-5, or
equivalent36^ temperature and pressure gauges at header end to monitor performance37^ valve or cap header ends to allow for future expansion
‘TP’ Fiberglass Tower Cells
Page: 24TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
SEE TECHNICALSPECIFICATION SHEET#01 - "TYPICAL PROCESSCONNECTIONS"
Component descriptions and generalinstallation notes listed on next page.
3.4 TYPICAL 2-PUMP TOWER SYSTEM CONFIGURATION
‘TP’ Fiberglass Tower Cells
Page: 25TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
TWO PUMP TOWER SYSTEM* Items included in typical TTS^ Items supplied by owner1* tower fan motor2* tower cell3^ tower flow control valve4^ capped tees for future expansion5^ tower return line to tank: 8-10” from bottom of tank6^ from process line: 8-10” from bottom of tank7* tank - process side8* tank - tower side9* pump tank assembly10* angle iron banding - increases slenderness ratio11* tank insulation - recommended for out-door applications in freeze areas12^ process pump starter13^ tower fan starter14* tower pump starter15* tower pump thermostat16* tower fan thermostat17^ to plant open drain18 pump deck - optional mounting platform19* tower pump suction valve 20* tower pump21* tower pump discharge valve22^ tower pump discharge pressure gauge23* tank divider: baffle24* process pump suction valve25^ tank drain valve26* process pump27* process pump discharge valve28^ process pump discharge pressure gauge29* plugged port - use for water level switch30* plugged port - use for water make-up supply connection31* tank overflow port32^ tower bleed valve - set @ 2 GPM per ton of tower33^ emergency operation drain valve34^ main header valve - from process35^ main header valve - to process36^ emergency operation water supply valve37^ from plant water service38^ valves at header branches to provide service flexibility and balance flow39^ tees at existing and future machine drops40 system balance valve - sized per system capacity. Use CASH ACME K-20, K-5, or
equivalent41^ temperature and pressure gauges at header end to monitor performance42^ valved or capped header ends to allow for future expansion
‘TP’ Fiberglass Tower Cells
Page: 26TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
A. TEMPTEK cooling tower cells are elevated in some manner toprovide the gravity induced return flow to the central systempump tank. The elevation is typically provided by a supportstructure, known as a “tower stand”. Shown here are severaloptions to consider for tower stand earth mounting.
TOWER STAND MOUNTING - PERMANENT
SOLID WELDED PLATEAND TEE BAR
TOWER STAND LEG -WELD DIRECTLY DOWN TO PLATE
CONCRETE SLAB OR PIER
TOWER STAND MOUNTING - PIER MOUNTING
TOWER STAND MOUNTING - SLAB MOUNTING
SEE WEIGHTS OPERATING FOR LOADREQUIREMENTS. DIMENSIONS VARYWITH CAPACITY AS WELL AS GEOGRAPHICREGION AND TYPE OF SOIL.
TOWER STAND MOUNTING - REMOVABLE
NUT
NUT
NUT
LOCK WASHER
NUTMOUNTING PLATE
CONCRETESLAB OR PIER
2" DIA PIPE TO ALLOWFOR HOLE CENTER
ADJUSTMENT. DO NOTFILL WITH CONCRETE
WASHEROR PLATE
"J" BOLT OR THREADED ROD
3.5 TOWER STAND MOUNTING OPTIONS
‘TP’ Fiberglass Tower Cells
Page: 27TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
3.6 TYPICAL VACUUM BREAKER
* VACUUM BREAKER IS GENERIC
FOR VACUUM RELIEF VALVE.
DRAIN - DOWN VALVE
COMMON PIPE DIAMETER THROUGHOUT
8" MIN.
VACUUM BREAK (ANTI-SIPHON)*CASH ACME MODEL #VR-801 3/4"OR EQUIVALENT
INSTALLATION NOTES:
1. The purpose of the vacuum breaker/anti-siphon (also called a drain-back dam), is to retain water in the header system during shut-down, and to eliminate air purge and shock to plumbing during start-up.
2. It is necessary to duplicate this arrangement on both the supply and return lines.
3. The drain-down valve allows header drainage for system maintenance and is closed during normal operation.
4. The vacuum breaker must be located at the highest point in the system, nearest to the tank to be most effective. A nipple length of 8 inches minimum is required to create sufficient vacuum to open the case Acme model VR-801.
‘TP’ Fiberglass Tower Cells
Page: 28TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
KEY
TWS - Tower Water SupplyTWR - Tower Water ReturnCWS - Chilled Water Supply*CWR - Chilled Water Return*
*INSULATE ALL CHILLEDWATER PIPING
The design of the unit-to-process hook up is key to optimizing the capability of the heating/cooling system.Selecting proper pipe ID’s, minimum run lengths, minimum elbows, tees, etc. are all important to creating a lowpressure drop... thus a high flow rate... installation.
This diagram schematically contains piping and valving details which may not be needed in all cases. However, formolding installations requiring maximum flexibility, a relatively minor increase in original piping costs can have greatefficiency paybacks in the future.
Select pipe sizes for 5-7 feet per second flow velocity and 5-10 psi pressure drop. Consult Temptek’s engineeringdepartment for assistance when needed.
TWS
TWR
CWSCWR
TWR CWR
TWS CWS
To/fromAuxiliary Unit
To/from Auxiliary Unit
To/fromAuxiliary Unit
Temperature and pressure gaugescheck system performance
Note: for many processes, watermanifolds are desirable at this location
Water Regulator Valve
HydraulicHeat Exchanger
Mold - Roll
or other process
To/fromAuxiliary Unit
TWS
TWR
CWSCWR
1 3
4
5 6 7 8
9
10
11
12
13 14
18 17 15 16
19 20
2
VALVE POSITION
Tower supply for auxiliary Open: 1 - 2Chilled water for auxiliary Open: 3 - 4Tower on mold Open: 5 - 6 - 9 - 10 - 11 - 12Chilled water on mold Open: 7 - 8 - 11 - 12Auxiliary on mold Open: 13 - 14Tower on heat exchanger Open: 5 - 6 - 17 - 18Chilled water on heat exchanger Open: 7 - 8 - 15 - 16Auxiliary on heat exchanger Open: 19 - 20
3.7 TYPICAL PRESS DROP
‘TP’ Fiberglass Tower Cells
Page: 29TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
3.8 EXPANDABLE TOWER CELL INSTALLATION
FROM PROCESS
SIZE TOWER SUPPLY PIPING FOR TOTAL FUTURE CAPACITY.INSTALL PLUGGED TEES AND BALANCE VALVE ON
FIRST TOWER FOR FUTURE USE.
ADJUST VALVES TO PROPERLY DIVIDE RETURN WATER HEAT LOAD.
SUPPLY SEPARATE RETURNSTO TANK.
MINIMUM SLOPE 10%RETURN TO TANK
BALANCEVALVE
•
•
•
•
FUTURE TOWER CELLSFUTURE TOWER CELL
ORIGINAL TOWER CELL
REFER TO FYI# 6-G-6 "EXPANSION OF COOLING TOWERSYSTEMS" FOR ADDITIONAL INFORMATION.
‘TP’ Fiberglass Tower Cells
Page: 30TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
RECOMMENDEDOPERATION AND MAINTENANCE SCHEDULEfor cooling tower cells
TYPE SERVICE
Inspect general condition of unit
Clean debris from unit
Clean and flush sump
*Check and adjust sump water level
Inspect heat transfer section (fill)
Inspect spray nozzles
Check and adjust bleed rate
*Check operation of make-up valve
Check unit for unusual noise or vibration
Check motor voltage and current
Lubricate fan motor bearings
Check fan for rotation without obstruction
Check fan and pump motor for proper rotation
Drain sump and piping
Inspect protective finsih
START-UP
X
X
X
X
X
X
X
X
X
X
X
X
X
MONTHLY
X
X
X
X
X
X
X
X
X
X
SIX MONTHS
X
SHUT DOWN
X
X
X
ANNUALLY
X*For unit without a remote sump
3.9 OPERATION AND MAINTENANCE SCHEDULE
‘TP’ Fiberglass Tower Cells
Page: 31TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
4.0 APPENDIX4.1 TYPICAL HYDRAULIC HEAT EXCHANGER COOLING BY HP @ 10° ∅T4.2 TOWER WATER REQUIREMENTS VS PIPE SIZE TO CONDENSE
CHILLERS4.3 WET BULB
‘TP’ Fiberglass Tower Cells
Page: 32TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
NORMAL TYPICAL GPM ACTUALPRESS HYDRAULIC REQUIRED PIPE SIZES GPM
SIZE IN TONS HP BTU* @ 10°ΔT @ 6”/SEC @ 6”/SEC
50 10 15,270 3.07 1/2” 5.76
75 15 22,905 4.60 1/2” 5.76
150 20 30,540 6.13 3/4” 10.08
25 38,175 7.67 3/4” 10.08
200 30 45,180 9.20 3/4” 10.08
35 53,445 10.73 3/4” 10.08
40 61,080 12.27 1” 16.56
45 68,715 13.80 1” 16.56
250/300 50 76,350 15.33 1” 16.56
450 75 114,525 23.00 1 1/4” 28.08
550 100 152,700 30.66 1 1.4” 28.08
700 125 190,876 38.33 1 1/2” 38.16
1,000 225 393,575 79.03 2 1/2” 89.28
*ASSUME HEAT REJECTION IS = 1,527 BTU/HR/HP @ 100% EFFICIENCY
4.1 TYPICAL HYDRAULIC HEAT EXCHANGER COOLING BY HP @ 10° ∅ T
‘TP’ Fiberglass Tower Cells
Page: 33TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
4.2 TOWER WATER REQUIREMENT VS PIPE SIZE TO CONDENSE CHILLERS
CHILLER GPM REQUIREMENTS BTU REJECTION PIPETONS @ 6” PER SEC PER HOUR SIZE
2 6 26,000 1/2”
5 15 62,500 1”
7.5 22 93,750 1”
10 30 125,000 1 1/2”
15 45 187,000 1 1/2”
20 60 250,000 2”
30 90 375,000 2 1/2”
40 120 500,000 3”
60 180 750,000 4”
‘TP’ Fiberglass Tower Cells
Page: 34TEMPTEK, INC.525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277Service Department Fax: 317-885-8683
4.3 WET BULB
The initial step inselecting a cooling toweris the determination of thelocation’s wet bulbtemperature. Mechanicaldraft cooling towers (i.e.deliver water attemperatures 7° - 10°above the ambient wetbulb conditions. As youcan see, the wet bulbtemperature determines
how much cooling the tower cell can deliver.
Wet bulb temperatures are figured with a “psychrometer”.Two thermometers are mounted side by side. One has a“wet sock” over its bulb. The other does not. When astream of rapidly moving air is directed over thethermometer bulbs, water (in the sock) evaporates andcools the air over that bulb, resulting in a lowertemperature (the wet bulb). The “dry bulb” temperature isfigured by the thermometer without a wet sock and is the ambient air temperature.
The wet bulb temperature indicates how much water can evaporate into the surrounding air. Since acooling tower cools water by evaporation, its performance is dependent on the wet bulb temperature.Lower wet bulb temperatures means more evaporation and more cooling.
Wet bulb temperatures vary with location (i.e. 55°F in Alaska to 78°F inFlorida). Each location (i.e. major cities - see reverse) has a publishedwet bulb temperature. The average wet bulb temperature range is 74° -78°F. Tower cell design is standardized at a 78°F wet bulb temperature.Thus, a cooling tower operates at 100% capacity when the wet bulbtemperature is 78°F.
As the wet bulb temperature changes (with relative humidity),performance of the cooling tower also changes. In fact, the relationshipis inverse. Meaning, as the wet bulb temperature increases, coolingperformance (capacity) decreases. As wet bulb temperature decreases,cooling capacity increases. The changes are not dramatic, just a coupleof degrees. But can dramatically affect capacity. The chart abovedetails this relationship.
Published wet bulb temperatures (on reverse) will help you select theright tower cell. For example, if the wet bulb temperature is 65°F, thetower cell will deliver 170% capacity. Understanding the standarddesign criteria (78°F wet bulb at 100%), the tower will be able to delivermore capacity than needed or allow for future expansion. Withoutconsidering the wet bulb temperature, you most likely will not select thecorrect tower cell capacity to start with. Consult with your TEMPTEKsales engineering for exact details on tower cell selection.
Finally, on an engineering note, when you select your tower cell, add1°F to the published wet bulb temperature for the geographic area, justto be conservative.