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8/4/2019 Copia de Copia de Refrig Calc
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Pressure conversions PSI PSIA Inches of Hg
Enter PSI 95 95 109.696 193.4131737
Enter PSIA 15.696 1 15.696 2.035928144
Enter inches Hg 2.035928144 1 15.696 2.035928144
Enter kPa 6.893 0.999995341 15.6959953 2.035918657
Enter mm Hg 51.715 1.000004789 15.6960048 2.035937895
Enter bar 0.06895 1.000292125 15.6962921
Mpa 3.66 530.9709773 545.666977 1080.800146
Temperture conversions Fahrenheit Rankine Celsius
Enter Fahrenheit 130 130 590 54.44444444
Enter Rankine 570 110 570 43.33333333
Enter Celsius -48.5 -55.3 404.7 -48.5
Enter Kelvin 271 28.4 488.4 -2
Volume conversions Cubic inches Cubic feet Cubic yard
Enter cubic in. 46656 46656 27 1
Enter cubic feet 27 46656 27 1
Enter cubic yard 1 46656 27 1
P=pressure
V=volume
T=temperture
Charle's law V1/T1=V2/T2
Enter 3 of the 4 values
Enter Volume 1 100 100
Temperture 1 Fahrenheit 163.4567901 Fahrenheit
Enter Volume 2 81 81
Temperture 2 Fahrenheit 45 45 Fahrenheit
General law of Perfect Gas (P1*V1)/T1 = (P2*V2)/T2
Enter 5 of the 6 values
Enter PSI 1 180 180 PSIEnter volume 1 72 72 Units
Enter temp. 1 fahrenheit 110 110 Fahrenheit
Enter PSI 2 3 3 PSI
Enter Volume 2 72 72 Units
Enter temp. 2 fahrenheit -408.1924641 Fahrenheit
PSIA 1 Volume 1 PSIA 2
Boyle's law 187 15 151
P1*V1=P2*V2 187 15 151
Volume 1 T. (Rankine)
Charle's law 950 540
V1/T1=V2/T2 950 540
General law of perfect gas PSIA 1 Volume 1 T. (Rankine) PSIA 2
(P1*V1)/T1 = (P2*V2)/T2 200 30 585
200 30 585 169.2307692
PSI Volume 1 Fahrenheit PSI
185.304 30 125 154.5347692
Dalton's law
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Pt=p1+p2+p3+p4 Gas 1 8
Pt=total pressure Gas 2 15
Gas 3 23
Gas 4 14
Gas 5 92
Gas 6
Gas 7
Gas 8
Gas 9
Gas 10
Gas 11
Total 152
Inches of
PSI mercury(Hg)
Enter PSI 14.696 14.696 29.92
Enter Hg. 29.92 0.068045727 29.92
PSI kPa
Enter PSI 30 30 206.7
Density =mass./volume
Water = 62.4 lbs/cu. ft.
Liquid
Pounds/cu. ft. liquid 75.228
Specific Gravity 1.205576923
air weighs 0.07655 lbs./cu. ft. Specific Gravity is the relation of
1 cu. ft. gas weighs 0.53585 to water(if liquid) or air(if gas)
S.G. 7 water weighs 8.33 pounds per gal
air weighs 0.07655 pounds per cu
S.G. 7
1 cu. ft. weighs 0.53585 API 11.5
SG 0.98951049Kg/m3 1207
lb/ft3 75.3168 SG 0.9875
API 11.79113924
lb/ft3 75.288
Kg/m3 1206.11376
g/cm3 1
lb/ft3 62.43 1 lb = 0.453592 kg
oz/in3 0.578 1 lb = 453.592 g
lb/in3 0.036 1 g = 0.002204 lb
1 kg = 2.20462 lb
Convert inch vacuum to PSI 1 g = 0.001 kg
Input inch vacuum 3PSIG for low side of compression ratio -1.48 -1.473
Compression ratios for refrigeration
Input high side pressure gauge amount 400
Do not input in. vacume
Input low side pressure gauge amount -1.48
Compression ratio 31.37:1
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Volume of pipe
diameter inch 10
length inch 6
mat. lbs./cu.in. 0.043
lbs. in container
volume cu. in. 471.238898 20.26327262
half cyl. cu. in. 235.619449 10.13163631
Density input lbs./cu.in. lbs./cu.ft. lbs./cu.yd.
lbs./cu.in. 0.02143347 0.02143347 37.0370362 999.9999763
lbs./cu.ft. 75.288 0.043569444 75.288 2032.776
lbs./cu.yd. 1000 0.021433471 37.037037 1000
kg/cu.m. 593.276 0.02143343 37.0370367 999.9985742
kg/cu.cm
g/cu.m.
g/cu.cm. 0.549 0.019764 34.27407
Density =mass./volume
Energy conversion BTU/lb. F kJ/kg Centigr calorie/gram centig
BTU/lb. F 1 1 4.1868 1
kJ/kg Centigrade 4.1868 1 4.1868 1calorie/gram centigrade 1 1 4.1868 1
kilocalorie/kilogram centigrade 1 1 4.1868 1
joule/gram centigrade 4.1868 1 4.1868 1
joule/kilogram centigrade 4186.8 1 4.1868 1
Recovery tank capacity wc * .8 + tw = gw @ 80%
Water capicity in pounds 35
Tare weight 14.35
Gross weight at 80% full 42.35
Metric Prefixes
exa(E) 1,000,000,000,000,000,000 0.00000003
peta(P) 1,000,000,000,000,000 0.0000003
tera(T) 1,000,000,000,000 0.000003
giga(G) 1,000,000,000 0.00003
mega(M) 1,000,000 0.0003
kilo(k) 1,000 0.003hecto(h) 100 0.03
deka(da) 10 0.3
unit of measure 1 3
deci(d) .1 30
centi(c) .01 300
milli(m) .001 3000
micro(u) .000001 30000
nano(n) .000000001 300000
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pico(p) .000000000001 3000000
femto(f) .000000000000001 30000000
atto(a) .000000000000000001 300000000
Material Temperature Lb./ft^3 ft^3/lb.
air 70 0.075 13.3333333
water 70 62.4 0.01602564
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kPa mm Hg bar Mpa
654.8380512 4912.90147 6.55006
6.893032118 51.71475231 0.068929864
6.893032119 51.71475232
6.893 51.71451135
6.893065132 51.715
3660 3.66
Kelvin
327.4444444
316.3333333
224.5
271
Volume 2
18.57615894
Volume 2 T. (Rankine)
990
990 562.7368421
Volume 2 T. (Rankine)
30 495
30 495
Volume 2 Fahrenheit
30 35
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product
lon & 62.4 lbs./cu. ft.
bic foot
1 in³ = 16.3870 cm³ 1 m³ = 61023.744 in³
1 in³ = 1.638706e-05 m³ 1 m³ = 35.3146 ft³
1 ft³ = 28316.846 cm³ 1 m³ = 1.30795 yd³
1 ft³ = 0.028316 m³ 1 cm³ = 0.061023 in³
1 yd³ = 0.764554 m³ 1 cm³ = 3.531466e-05 ft³
1 yd³ = 764554.861 cm³ 1 cm³ = 1.307950e-06 yd³
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kg/cu.m. kg/cu.cm g/cu.m. g/cu.cm. Density
593.2760681 0.000593278 593276.0681 0.59327824
1206.033144 0.001205997 1206033.144 1.205997112 0.013282329
593.2766031 0.000593276 593276.6031 0.593275935
593.276 0.000593276 593276 0.593276
kilocalorie/kilogram joule/kilogram centigrade
1 4186.8
1 4186.81 4186.8
1 4186.8
1 4186.8
1 4186.8
8/4/2019 Copia de Copia de Refrig Calc
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Work=Force x Distance
Force in lbs 30
Distance in ft. 13
ft-lbs. 390
Horsepower
Pounds 1050.45
Feet 16
Minutes 0.5
Ft. lbs./ minute 33614.4
Horsepower 1.018618182
12,000 BTU's = 1 Ton SEER Sq. Ft. / Ton
SEER rating (low, med, high) med high 800
Enter house Sq. ft. 2500 700 low 600
Minimum Tons needed 3.6 med 700
Estimated tons needed 3.9
Elect. Heating/Sq. ft. To melt one lb. of ice it takes 144
Enter Sq. ft. 1530 One ton or refrigeration means 28
Elect. Service (120, 240, etc.) 120 Divide by 24 and 288000/24=120BTU's required 76500
Minimum Watts required 22414.29827
Watts required 23000
Amps required 192
Minimum Amps required 186.7858189
cubic inches of pipe
Inner diameter of pipe 1
length in inches 12
Cubic volume in inches 9.424777961
Refrigeration Rating
Ton(s) 3
Elect. Service 240BTU's required / hour 36000
Watts required / hour 10547.90507
Kilowatts / hour 10.54790507
Horsepower / hour 14.14497126 horsepower equals watts/745.7
Amps required / hour 43.94960445 watts equals horsepower*745.7
Circumference of a circle Circumference
diameter 4 12.56637
Circumference = diameter*pi
Drive gear dia. (input) 144 144
Driven gear dia. (output) 1.5 1.5 Output : Input
Gear ratio 96 96 : 1
Drive gear RPM 96 96
Gear ratio 19.27 19.27
Driven gear RPM 1849.92
Matching gear sets
Drive RPM 96 96
Matching gear set ratio 5 5
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Number of gear sets 2 2
Driven RPM 2400
do not include the drive shaft gear or the driven shaft gear in the gear set number
Torque in Ft.-lbs. 480
Force in lbs. 80 80
Distance in Ft. 6 6
Torque input ft.-lbs. 480 480
Output ratio 19.27 19.27
Input ratio 1 1
Torque output ft.-lbs. 24.90919
BTU's 288000 288000
temp differance 27 27
Lbs water 10666.67
Compression ratio = Absolute discharge pressure / Absolute suction pressure
PSIG
Discharge pressure 50
Suction pressure 10Ratio 2.6 to 1
Inch Hg vacuum 14
PSIG -6.87674656
Belt drive motor Motor RPM * input pully size / output pully size = output RP
Motor RPM 1750 1750
Input pully 1 1
Output pully 5 5
Output RPM 350
Horsepower from RPM
Force in lbs. 30
Distance in Ft. 0.1RPM 1800
Torque (ft-lbs) 3
Horsepower 1.028179741
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BTU's
8,000 BTU's/2000 lbs.(144*2000=288,000) in a 24 hour period.
0 BTU's per hour
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Fresh air infiltration/ventilation
House sq. ft. 3500
Ceiling height 9
% air change 20
Ft.^3/hr. 6300
Ft.^3/min 105
Load on heating equipment due to ventilation
Indoor temperature 70
Outdoor temperature 17
CFM outside ventilation air 105
BTU's/hr. needed due to ventilation 6010.2
Load on cooling equipment due to ventilation
Outdoors BTU/lb. 37.68
Indoors BTU/lb. 28.2
CFM outside ventilation air 210
Heat added due to ventilation 8958.6 BTU/hr.
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A BTU is the amount of heat to raise 1 lb. of water 1 degree fahrenheit
kW/hr. to BTU/hr Kw/hr. BTU/hr.
1.32 4505.16
BTU/hr. to kW/hr. BTU/hr. kW/hr.
4506 1.320246
Elect. Heating/Sq. ft.
Enter Sq. ft. 1530
Elect. Service (120, 240, etc.) 120
BTU's required 76500
Minimum Watts required 22414.29827
Watts required 23000
Amps required 192
Minimum Amps required 186.7858189
Refrigeration Rating
Ton(s) 3
Elect. Service 240
BTU's required / hour 36000
Watts required / hour 10547.90507Kilowatts / hour 10.54790507
Horsepower / hour 14.14497126 horsepower equals watts/745.7
Amps required / hour 43.94960445 watts equals horsepower*745.7
Known Answers
Volts(E) = 240 N/A
Amps(I) = 15 N/A
Ohms(R) = 16
Watts = 3600
Horsepower = 2.68452
Volts=Amps*Ohms E=I*R
Watts=Volts*Amps P=E*I
Volts(E) 120 120
Ohms(R) 14.11765
Amps(I) 8.5 8.5
Parallel Circuit
R1 10
R2 30
Total Resistance 7.5
Watts P=I*E 48
Amps I=P/E 0.4 0.4
Volts E=P/I 120 120
Volts E=I*R 240 240
Amps I=E/R 20 20
Ohms R=E/I 12
Impedance is the opposition to current in an AC circuit. In other words it is resistance. Measured in ohms.
Volts 120
Amps 3
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Impedance 40
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Air volume (cfm) = Air velocity (ft./min.) X Cross-sectional area (ft^2)
Square duct
length (inch) 9
width (inch) 8
air velocity (ft./min.) 700
Air volume (cfm) 350
Round duct
Inner diameter (inch) 16
air velocity (ft./min.) 700
Air volume (cfm) 977.3844