PREFIXES , CONVERSION ,FACTORS

Prefixes

Units can be used as such or in multiples or fractions of ten:

PREFIX

POWER OF TEN

T

tera

1012

G

giga

109

M

mega

106

k

kilo

103

h

hecto

102

da

deca

101

d

deci

10-1

c

centi

10-2

m

milli

10-3

m

micro

10-6

n

nano

10-9

P

pico

10-12

f

femto

10-15

a

atto

10-18

1 m = 100 cm = 1000 mm
1 m2 = 10 000 cm2 = 106 mm2
1 m3 = 106 cm3 = 109 mm3
1 Mg m-3 = 103 kg m-3 = 1 g cm-3
1 kPa = 10 mbar
1 joule = 0.2388 cal
1 watt = 1 J s-1 = 0.8598 kcal h-1
1 W m-2 = 0.8598 kcal m-2 h-1
1 W m-2 = 1.433 × 10-3 cal cm-2 min-1
1 Hp = 745.7 W
1 W = 0.001431 Hp
Water flow (m3 s-1) = 0.55 × Pump power (W)/Pressure (kPa)
Water flow (litre s-1) = 5.43 × Pump power (kilowatts)/pressure (bars)

Brake Horsepower is the horsepower for an electric motor. Do not use for fuel-powered engines.

Conversion factors

Temperature

Standard unit: degree Celsius (°C)

degree Fahrenheit (°F) °C = (°F-32) 5/9
kelvin(s) (K) K = °C +273.15

Pressure (air pressure, vapour pressure)

Standard unit: kilopascal (kPa)

millibar (mbar) 1 mbar = 0.1 kPa
Bar 1 bar = 100 kPa
centimetre of water (cm) 1 cm of water = 0.09807 kPa
millimetre of mercury (mm Hg) 1 mm hg = 0.1333 kPa
atmosphere (atm) 1 atm =101.325 kPa
pound per square inch (psi) 1 psi = 6.896 kPa

Wind speed

Standard unit: metre per second (m s-1)

kilometre per day (km day-1) 1 km day-1 = 0.01157 m s-1
nautical mile/hour (knot) 1 knot = 0.5144 m s-1
foot per second (ft s-1) 1 ft s-1 = 0.3048 m s-1

Radiation

Standard unit: megajoule per square metre and per day (MJ m2 day-1) or as equivalent evaporation in mm per day (mm day-1)

equivalent evaporation (mm/day) 1 mm day-1 = 2.45 MJ m-2 day-1
joule per cm2 per day (J cm-2 day-1) 1 J cm-2 day-1 = 0.01 MJ m-2 day-1
calorie per cm2 per day (cal cm-2 day-1) 1 cal = 4.1868 J = 4.1868 10-6 MJ
1 cal cm-2 day-1 = 4.1868 10-2 MJ
m-2 day-1
watt per m2 (W m-2) 1 W = 1 J s-1
1 W m-2 = 0.0864 MJ m-2 day-1

Physical properties

Properties of Water

T

rw

l

°C

Mg m-3

kJ mol-1

0

0.99987

45.0

4

1.00000

44.8

10

0.99973

44.6

20

0.99823

44.1

30

0.99568

43.7

40

0.99225

43.4

T = temperature, rw = density of water and l = latent heat of vaporization

Properties of gases at Pb = 101.3 kPa barometric pressure

T

r

°C

mol m-3

0

44.6

5

43.8

10

43.0

15

42.3

20

41.6

25

40.9

30

40.2

35

39.5

40

38.9

T= temperature and r = density

Black body emittance (W m-2) as a function of subzero temperature (°C)

°C

0.0

-0.1

-0.2

-0.3

-0.4

-0.5

-0.6

-0.7

-0.8

-0.9

-14

256

255

255

255

254

254

253

253

253

252

-13

260

259

259

258

258

258

257

257

257

256

-12

264

263

263

262

262

262

261

261

260

260

-11

268

267

267

267

266

266

265

265

265

264

-10

272

271

271

271

270

270

269

269

269

268

-9

276

276

275

275

274

274

274

273

273

272

-8

280

280

279

279

279

278

278

277

277

276

-7

284

284

284

283

283

282

282

282

281

281

-6

289

288

288

287

287

287

286

286

285

285

-5

293

293

292

292

291

291

291

290

290

289

-4

298

297

297

296

296

295

295

294

294

294

-3

302

302

301

301

300

300

299

299

298

298

-2

306

306

306

305

305

304

304

303

303

302

-1

311

311

310

310

309

309

308

308

307

307

0

316

315

315

314

314

313

313

312

312

311




HUAYI ,COMPRESSOR , HYE55YL63 ,1/6 Hp , 129Kcal ,R134a, 220V ,LBP

LBP



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Notion Never use, joint compound, Teflon or tow for the sealing of fittings, Air conditioning
 



COMPRESSOR , EMBRACO , FF6BK , 1/5 HP, 115V , R12 , LBP , 635 BTU , Manufactured by , Tecumseh

PDF DOCUMENTATION

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Images , EXPLOSION D’UN CONDENSATEUR ,(condensator , capacitor) , de Démarrage ,EN SURTENSION

Images, EXPLOSION OF A SURGE CAPACITOR

Un condensateur est un dispositif utilisé pour stocker une charge électrique, composé d’une ou plusieurs paires de conducteurs séparés par un isolant.

De façon inattendue, les condensateurs électrolytiques explosent avec un son énorme et parfois de la fumée.

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