Flashcards
Nate Core Essentials
Flashcards do conjunto (37)
- 1Volume of a roomWidth ft. X Height ft. X Length ft. = ft3r power
- 2Square ft.Length ft. X Width ft.
- 3CFM per ton of cooling400 cfm per hour
- 4Define CFMCubic Feet per Minute
- 5Find CFM for 14,400 cubic ft. room needing 5 air changes per hour14,400cf / 60min = 240cfm
240cfm X 5 = 1,200cfm - 6What is the cross section of 10in round metal ductPi X Radius to the 2 power
- 7Please excuse my dear aunt sallyParentheses, exponents, multiplication, division, addition, subtraction
- 8BTUH Sensible heat equation1.08 x cfm x Delta-T
- 9BTUH Latent heat equation.68 x cfm x delta - grains
- 10Total heat equation4.5 x cm x delta - enthalpy
- 11how to convert Watts to BTU'sW x 3.413
- 12Resistance in seriesr1+ r2 +r3 = total r
- 13resistance in parallel1 / 1/r1 +1/r2 +1/r3 =
- 14capacitors in series1/ 1/c1 + 1/c2 + 1/c3
- 15hp2 =hp2 = hp1 x (cfm2/cfm)3rd power
- 16static pressure 2 =sp2 = sp1 x (cfm2/cfm1)2
- 17revolutions per minute rpmrpm2 = rpm1 x (cfm2/cfm1)1
- 18What are the 3 fan lawsrevolution per minute 2 ()1
static pressure 2()2
horse power 2()3 - 19area of a rectanglel x w
- 20area of a circlepi x radius 2nd power
- 21diameter of a circle:circumference / pi
- 22air velocityft/min
- 23air velocity equationft/min = cfm / duct area .
- 24volume:cfm = Cubic Feet per minute
- 25static pressure is measured ininch w.g.
- 26What does delta meansymbol triangle = difference
- 27pi =3.14159
- 28h.g. stands for:inches of mercury
- 29atmosphere pressure at sea level14.7 psi
- 301psi = ( )w.g.27.7612 w.g.
- 311psi = how many in h.g: feet of water: in of w.:h.g.29.92
33.9ft of water
w.g.406.8 - 32turn btu sensible equation into cfm equationbtu = 1.08 x cfm x delta-t
cfm = btu / 1.08 x delta-t - 33latent heat also refers tohumidity in the air
- 34psychrometer unit of measurementgrains
- 35convert 10in by 8in sq duct from sq into sq ft.10x8=1802ndp
180 x (1/144) = 1.25ft2ndp - 36velocity =cfm / grill area in inch. that has been converted to sq ft.
- 37—
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- Descrição
- Test question that will be given for the NATE core essentials course
- Criado por
- Jay Dee
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