Technical information

ManualsBrandsConair ManualsAir CompressorVL Series

UGH021/0301 VL Series Portable Chillers, 2 to 40 Tons

Page: 75

8.10 ENGINEERING FORMULAS

1 ton = 12,000 btu

BTU = Material (lbs) X material 's specific heat X temperature difference

1 BTU = .293 watts

1 watt = 3.42 BTU

1 KW = 1000 watts

1 KW = 3420 BTUs

BTU/hr = GPM X T (for water cooled condensers)

1 Gallon of Water = 8.34 lbs

= 231 cubic inch

= .1337 cubic feet

= 3.785 liters

= 4 quarts

1 Pound of Water = .1198 gallon

1 Cubic foot of Water = 7.481 gallons

= 62.37 pounds

F = (9/5 X C) +32

C = 5/9 X ( F - 32)

Volume of Cylinder =

X R

X L

Circumference of Circle = Diameter of Circle X

Diameter of Circle = Circumference X .3183

Area of Circle =

X R

X L

X .7854

1 Gram = .0353 oz

1 Foot = 30.48 centimeter

454 Gram = 1 lb

1 Oz = 28.35 grams

1 Kilogram-calorie = BTUH X .252

1 Millimeter = inches X 25.4

1 Kilogram = Lbs X .454

1 Square Centimeter = .155 square inch

1 Square Inch = 6.452 sqaure centimeter

TONS =

GPM (water) X 8.34 X 60 X temperature difference X specific heat

12,000

TONS =

GPM (water) X T

12,000

1 HP =

PSI X GPM

1199

1 HP =

Feet of Head X GPM x Specific Gravity

2772

1 KVA = (three phase)

Amps X Volts X 1.73

1000

CFM =

KW X 300

Temperature Difference

CFM =

Tons X 10530

Temperature Difference

KW =

CFM X Temperature Difference

3000

1 KVA = (single phase)

Amps X Volts

1000

1 HP = 2546.5 BTU/hr

= 745.7 watts

= 42.442 BTU/min

PSI =

Feet of Head

2.3

Volts =

Watts

Amps

Volts = Watts X Ohms

PSI = .4331 X Feet of Head

1 Foot of Head = .4332 PSI

Feet of Head = PSI X 2.3

Watts = Amps X Volts (single phase)

= Amps X Volts X 1.73 (three phase)

Volts = Ohms X Amps

TOWER TON =

GPM x T

WEIGHED WATER TESTS

PIPE SIZING GUIDE

1/2" = 6 GPM

3/4" = 10 GPM

1" = 15 GPM

1 1/4" = 30 GPM

1 1/2" = 40 GPM

2" = 70 GPM

2 1/2" = 100 GPM

3" = 150 GPM

4" = 275 GPM

6" = 600 GPM

8" = 1,000 GPM

NOMINAL DESIGN FLOW

COOLING TOWER = 3 GPM PER TON

CHILLING = 2.4 GPM PER TON

OTHER EQUIPMENT

AIR COMPRESSOR w/no aft cooler = .1 TON/HP

AIR COMPRESSOR w/aft cooler = .2 TON/HP

VACUUM PUMP = .1 TON/HP

HYDRAULIC COOLING = .1 TON/HP

BARREL COOLING = 1 TON/IN SCREW DIA.

CHILLER SIZING

CHILLER TON =

#/min x T

200

TOWER TON =

#/min x T

250

CHILLER TON =

GPM x T

30#/hr H.D. Polyethylene = 1 ton

35#/hr L.D. Polyethylene = 1 ton

35#/hr Polypropylene = 1 ton

75#/hr PVC = 1 ton

50#/hr ABS = 1 ton

50#/hr Polystyrene = 1 ton

40#/hr Nylon = 1 ton

35#/hr Acrylic = 1 ton

40#/hr Polyurethane = 1 ton

50#/hr Acetal = 1 ton

40#/hr PPO = 1 ton

40#/hr PET = 1 ton

50#/hr Polycarb = 1 ton

INJECTION MOLDING

EXTRUSION

BLOWN FILM

45#/hr H.D. Polyethylene = 1 ton

45#/hr L.D. Polyethylene = 1 ton

45#/hr Polypropylene = 1 ton

75#/hr Polystyrene = 1 ton

70#/hr PVC = 1 ton

105 CFM

(50 F air @ 78 F WBT)

= 1 ton

BLOW MOLDING

40#/hr Polyolefins = 1 ton

CHILLER CAPACITY LOSS =

2% for each 1 F below 50 F LWT

(based on 5'-7' feet/second velocity)

ABBREVIATIONS, EQUIVALENTS & FORMULAS

1 GALLON = 8.33 lbs (water)

1 CUBIC FOOT = 7.48 gallons

TOWER CELL EVAPORATION

RATE = 2 gal. per ton per hour

PSI = Pounds Per Square Inch

GPM = Gallons Per Minute

EWT = Entering Water Temperature

LWT = Leaving Water Temperature

BTU = British Thermal Unit

BTU/HR = GPM x 500 x T (water)

FT. H.D. = PSI x 2.31

1 COOLING TOWER TON = 15,000BTU/HR

1 REFRIGERANT TON = 12,000 BTU/HR

-17.8

-15

-12.2

-9.4

-6.7

1.1

1.7

4.4

7.2

10.0

12.8

15.6

TEMPERATURE

F to C = ( F - 32) x .55 = C

C to F = ( C x 1.8) + 32 = F

METRIC CONVERSION TABLE

2.540

.3048

.9144

1.609

16.387

.01639

.02832

28.317

.7646

29.57

3.785

POWER

FT/LB/SEC

Boiler HP

watts

BTUH

HEAT

BTU

BTU/LB

BTU/SQ FT

BTU/CU FT

kg-cal

gr-cal/sq cm

kg-cal/cum

grams

tonnes

sq cm

sq meters

sq km

1.356

3420

33475

2545

.7457

.252

.5556

.2713

8.899

.0648

28.350

.4536

907.2

.9072

1016

6.452

.8361

2.590

WEIGHT

Grains

Ounces*

Pounds*

US tons

Long tons

AREA

Sq inches

Sq years

Sq miles

TO CONVERT

FROM TO Multiply by:

UNIT VOLUME

US GPM

CFM

3.785

.2271

28.317

1.6992

TO CONVERT

FROM TO Multiply by:

liters/min

cum/hr

liters/min

cum/hr

UNIT WEIGHT

Lbs/sq in

Lbs/cu in

gr/sq cm

kPA

kg/sq cm

gr/cu cm

70.31

6.894

.07031

27.68

meters

LENGTH

Inches

Feet

Yards

Miles

cu cm

liters

cu meters

liters

cu meters

cu cm

liters

VOLUME

Cu inches

Cu feet

Cu years

Fl ounces

US gal

*Auoirdupois pounds and ounces