Thursday, August 11, 2022

## HVAC FORMULA’S AND CONVERSIONS PDF FILE

### HVAC FORMULAS::

TON OF REFRIGERATION – The amount of heat required to melt
a ton (2000 lbs.) of ice at 32°F
288,000 BTU/24 hr.
12,000 BTU/hr.
APPROXIMATELY 2 inches in Hg. (mercury) = 1 psi
WORK = Force (energy exerted) X Distance
Example: A 150 lb. man climbs a flight of stairs 100 ft.

high
Work = 150 lb. X 100 ft.
Work = 15,000 ft.-lb.
ONE HORSEPOWER = 33,000 ft.-lb. of work in 1 minute
ONE HORSEPOWER = 746 Watts
CONVERTING KW to BTU:
1 KW = 3413 BTU’s
Example: A 20 KW heater (20 KW X 3413 BTU/KW = 68,260 BTU’s
CONVERTING BTU to KW:
3413 BTU’s = 1 KW
Example: A 100,000 BTU/hr. oil or gas furnace
(100,000 ÷ 3413 = 29.3 KW)

HVAC FORMULA’S AND CONVERSIONS PDF FILE

COULOMB = 6.24 X 1018 (1 Coulomb = 1 Amp)
E = voltage (emf)
I = Amperage (current)
WATTS (POWER) = volts x amps or P = E x I
P(in KW) = E x I
1,000
U FACTOR = reciprocal of R factor
Example:
1 R = .05U
19
= BTU’s transferred / 1 Sq.Ft. / 1ºF / 1 Hour

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