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June 2008

IP and SI Conversions

by: Garth Denison

Senior Application Engineer

The Sporlan Division of Parker Hannifin assumes no obligation or liability for any advice furnished or for anyresults obtained with respect to this information. All such advice is given and accepted at users risk. Thisdisclosure of information herein is not a license to operate under, or a recommendation to infringe any patentof Sporlan Division of Parker Hannifin or others.

® Registered trademark of Sporlan Division of Parker Hannifin, Washington, MO 63090 USA

© Copyright 2003 by Sporlan Division of Parker Hannifin, Washington, MO 63090 USA

This document may be copied and distributed for educational purposes only.

Cold W.A.R. Issue 019

 A collection of short

pointed topical papers.

®

 1 9

 W he t he r  i t ’ s  A i r

  Co nd i t io n i ng o r

  Re f r ige ra t io n

 I f  yo u a re  v ie w i n

g a co p y,  b u t 

 wo u ld  l i ke  to  rec

e i ve  t he  mo n t h l y 

 Co ld  W. A . R. d i rec t l y, e -

 ma i l

Co ld W a r S V D @ p

 a r ke r.co m

 to  jo i n o u r  ma i l i ng  l i s

 t.

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Education is Just the Beginning

Cold W.A.R. Issue 19 - Page 2

Air Conditioning and RefrigerationIP Inch Pound and SI Metric Converter

Quick Pick Formulas

Celsius °C = 5/9 (°F - 32)

Fahrenheit °F = 9/5 C + 32

Kilojoules 1 kJ = 0.9478 BTU

BTU 1 BTU = 1.055kJ

Megajoules 1MJ=0.278kW•hr

Kilowatt•hours 1kW•hr=3.60MJ

Kilowatts 1 kW = 1.34 HP

Horsepower 1HP=0.746kW

Watts 1W=3.412BTU/hrBTU/hr 1BTU/hr=0.2931W

Kilowatts 1 kW = 0.2843 ton

Tons Rerig. 1 ton = 3.517 kW

Kilopascals 1 kPa = 4.015 in H2O

Inches o water 1 in H2O = 0.2491 kPa

Kilopascals 1kPa=0.3346ftH2O

Feet o water 1ftH2O = 2.989 kPa

Kilopascals 1 kPa = 0.2953 in Hg

Inches o Hg 1inHg=3.386kPa

Kilopascals 1 kPa = 0.145 psi

Lb orce/sq in 1psi=6.895kPa

Meters 1m=3.28ft

Feet 1ft=0.3048m

Millimeters 1 mm = 0.03937 in

Inches 1 in = 25.4 mm

Sq meters 1 m2=10.764ft2

Sq eet 1ft2 = 0.0929 m2

Cubic meters 1 m3=35.31ft3

Cubic eet 1ft3 = 0.0283 m3

Meters/sec 1m/sec=196.9fpmFeet/min 1fpm=0.0051m/sec

Cubic meters/sec 1 m3 /sec=2119cfm

Cubic eet/min 1cfm=0.000472m3 /sec

Cubic meters/hr 1 m3 /hr=0.589cfm

Cubic eet/min 1cfm=1.70m3 /hr

Liters/sec 1l/sec=2.119cfm

Cubic eet/min 1cfm=0.472l/sec

Liters/sec 1 l/sec = 15.81 gpm (US)

GPM/min (US) 1gpm=0.063l/sec

Kilograms 1 kg = 2.20 lb

Pounds 1lb=0.4536kg

Enthalpy: BTU/lbx2.326=kJ/kgor kJ/kg x 0.4299 = BTU/lb

Heat fow rate: BTU/hrx0.2931=WorWx3.412=BTU/h 

Tonrefrig.x3.517=kWorkWx0.2843=Tonrefrig.

Pressure: psix6.895=kPaor kPa x 0.145 = psiin H2O x 249.1 = Pa or Pa x 0.004015 = in H

2O

Volume fow: GPM(US)x6.309x10-2=liters/sec 

Liters/secx15.85=GPM(US) 

CFM x 4.719 x 10-4 = m3 /s

m3 /s x 2119 = CFM

Velocity: ft/minx0.00508=m/sorm/sx196.85=ft/min 

ft/secx0.3048=m/sorm/sx3.281=ft/sec

Mass: lbx0.4536=kgor kg x 2.205 = lb