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Advantage Engineering
Engineering Formulas


Nominal Design Parameters

Chillers: 2.4GPM/Ton @ 10° F ∆T Flow Rate

    • 12,000 BTU/HR/Ton
    • 20° F – 60° F Standard Supply Range
    • Rating at 50° F Supply Temperature
    • 85° F Water Cooled Condenser
    • 95° F Air Cooled Condenser




Cooling Tower = 15,000 BTU/HR/Ton
 


  • 3 GPM per Ton

  • 85° F Leaving Water Temperature

  • 95° F Entering Water Temperature

  • 78° F Wet Bulb
Tower water make-up requirements:
Untreated 2% of flow rate   Treated 1.5% of flow rate

Weighted Water Test
Chiller Ton = GPMx∆T
(Delta Temp
)


24          
       
Tower Ton =GPMx∆T
(Delta Temp)



30         
Chiller Sizing
Injection Molding

Blow Molding

Extrusion
30#/hr H.D. Polyethlene = 1ton  

40#/hr Polyolefins= 1 ton

 

50#/hr H.D. Polyethlene  = 1 ton
35#/hr L.D. Polyethlene = 1ton 40#/hr PET= 1 ton

 

50#/hr L.D. Polyethlene  = 1 ton
35#/hr Polypropylene   = 1ton Minimum Flow 04.8 gpm/ton

50#/hr Polypropylene = 1
ton         

45#/hr PVC = 1 ton 75#/hr Polystyrene = 1 ton                 
50#/hr ABS= 1 ton 75#/hr PVC = 1 ton
50#/hr Polystyrene= 1 ton

Blown Film Air Ring
Cooling

105 CFM (50 ° F @ 78°
F WBT)= 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

Chiller
Capacity Loss/Gain

  • Decrease nominal
    tonnage by approximately 2% per degree below a 50 ° F leaving water
    temperature.
  • Increase nominal
    tonnage approximately 2% per degree above 50 ° F leaving water
    temperature up to 55 ° F

Other
Equipment


Air Compressor w/no after cooler


=.1 ton/Hp

Air Compressor w/after cooler


=.2 Ton/Hp

Vacuum Pump

=.1 ton/Hp

Hydraulic Cooling


=.1 ton/Hp

Barrel Cooling

=.1 ton/in screw Dia.


Hot Runner Mold

= 1 ton/10.5KW

Water Pump in Circuit


=.2 Ton/Hr

Feed Throat

400Ton Machine or above 1 Ton
Below 400 Ton – 1/2 Ton


Extrusion Equipment


Gear Box Cooling


=1 Ton/100Hp

Feed Throat 3″ Screw or Less


=1 Ton

Above 3″ Screw


=2 Tons

Barrel or Screw Cooling


=1 Ton/Inch of Screw Diameter

Pipe
Sizing Guide
(Based on 5′ – 7′ feet/second
velocity)





 

1/8”  = .75 GPM   
3/4″ = 10 GPM  

2″ = 70 GPM   
6″ = 600 GPM
¼” = 1.5 GPM   
1″ = 15 GPM   
2 1/2″ = 100 GPM 8″ = 1,000 GPM
3/8” =  3 GPM   
1 1/4″ = 30 GPM
 3″ = 150 GPM 10″ = 3000 GPM
1/2″ =  6 GPM    1 1/2″ = 40 GPM    4″= 275 GPM 12″ = 5000 GPM

Metric
Conversion Chart

To
Convert

  

 

 To Convert

 


Unit Volume


Power




US GPM

Liters/Min

3.785

FT/Lb/SEC

Watts

1.356

US GPM

Cum/Hr

.2271

KW

BTUH

342

CFM

Liters/Min

28.317

Boiler HP

BTUH

33475

CFM

Cum/hr

1.6992

HP

BTUH

2545

Unit Weight


HP

KW

.7457

Lb/Ft

Kg/m

1.4881

Lbs/Sq in

gr/sq cm

70.31


Heat


Lbs/Sq in

kPA

6.894

BTU

Kg-cal

.252

Lbs/Sq in

Kg/Sq Cm

.07031

BTU/LB

Kg-cal

.5556

Lbs/Sq in

gr/cu cm

27.68

BTU/SQ FT

gr-cal/sq cm

.2713

Length

BTU/CU FT

Kg-cal/Cum

8.899

Inches

cm

2.540


Weight


Feet

meters

.3048

Grains

grams

.0648

Yards

meters

.9144

Ounces*

grams

28.350

Miles

km

1.609

LBS

kg

.4536

Volume

US tons

kg

907.2

Cu. Inches

cu cm

16.387

US Tons

Tonnes

.9072

Cu. Inches

liters

.01639

Long Tons

kg

1016

Cu Feet

cu meter

.02832


Area



Cu Feet

liters

28.317

SQ Inches

sq cm

6.452

Cu Years

cu meters

.7646

SQ Years

sq meters

.8361

Fl Ounces

cu cm

29.57

SQ Miles

sq km

2.590

US Gallon

cu meters

.003785

US Gallon

liters

3.785
 


*Auoirdupois pounds and ounces

 

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Temperature

°F°C°F°C°F°C°F°C
0-17.8351.715-9.45010.0
5-15404.420-6.75512.8
10-12.2457.2301.16015.6
°F  to °C =
(°F – 32) x .55 =°C
°C  to °F =
(°C x 1.8) + 32 =°F

Flow Rate
Vs. Temp Differences Per Ton

% Ethylene Glycol by Volume
vs Freeze Protection
1.2 GPM =   20 °F T10%
25°F 
2.4 GPM =   10 °F T20%
15°F 
4.8 GPM =     5 °F T30%
0°F 
9.6 GPM =  2.5 °F T40%
-15°F 
50%
-40°F 

Abbreviations,
Equivalents & Formulas

T
= Delta Temperature = Temperature Differential

PSI = Pounds per square inch1 Cooling Tower Ton=
15,000BTU/HR
GPM = Gallons per Minute1 Refrigerant Ton = 12,000
BTU/HR
EWT = Entering Water
Temperature
1 Gallon = 8.33 lbs (water)
LWT = Leaving Water
Temperature
1 Cubic Foot = 7.48 gallons
BTU = British Thermal Unit1 Mil = .001″
BTU/HR = GMP x 500 x . T
(water)
1 Bar = 14.7 PSI
1 HP = 2544 BTU/HR1 KW = 3413 BTU/HR
Ft. H.D. = PSI x 2.311 KW = 1.34 HP
Q=4.5 x CFM x H
= BTUH (Air Cooling)
PSI= Ft of
head/2.31
Pump HP=  .
GPM x P (Ft.H.D)        .
3960 x (0.65 to 0.75) (Pump Eff)
KW = Amps x
Volts x 0.85 x 1.73
1,000
 

 

Head
in Feet to PSI Conversions calculator

Filtration
Chart


Mesh


Micron


Inches


Mesh


Micron


Inches


4


5205


0.2030


80


177


0.0070


8


2487


0.0970


100


149


0.0059


10


1923


0.0750


120


125


0.0049


14


1307


0.0510


140


105


0.0041


18


1000


0.0394


170


88


0.0035


20


840


0.0331


200


74


0.0029


25


710


0.0280


230


62


0.0024


30


590


0.0232


270


53


0.0021


35


500


0.0197


325


44


0.0017


40


420


0.0165


400


37


0.0015


45


350


0.0138


550


25


0.0009


50


297


0.0117


800


15


0.0006


60


250


0.0098


1250


10


0.0004


70


210


0.0083


5


0.0002