# Nate Core Essentials

### Description

Test question that will be given for the NATE core essentials course
Flashcards by Jay Dee, updated more than 1 year ago
 Created by Jay Dee almost 4 years ago
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## Resource summary

 Question Answer Volume of a room Width ft. X Height ft. X Length ft. = ft3r power Square ft. Length ft. X Width ft. CFM per ton of cooling 400 cfm per hour Define CFM Cubic Feet per Minute Find CFM for 14,400 cubic ft. room needing 5 air changes per hour 14,400cf / 60min = 240cfm 240cfm X 5 = 1,200cfm What is the cross section of 10in round metal duct Pi X Radius to the 2 power Please excuse my dear aunt sally Parentheses, exponents, multiplication, division, addition, subtraction BTUH Sensible heat equation 1.08 x cfm x Delta-T BTUH Latent heat equation .68 x cfm x delta - grains Total heat equation 4.5 x cm x delta - enthalpy how to convert Watts to BTU's W x 3.413 Resistance in series r1+ r2 +r3 = total r resistance in parallel 1 / 1/r1 +1/r2 +1/r3 = capacitors in series 1/ 1/c1 + 1/c2 + 1/c3 hp2 = hp2 = hp1 x (cfm2/cfm)3rd power static pressure 2 = sp2 = sp1 x (cfm2/cfm1)2 revolutions per minute rpm rpm2 = rpm1 x (cfm2/cfm1)1 What are the 3 fan laws revolution per minute 2 ()1 static pressure 2()2 horse power 2()3 area of a rectangle l x w area of a circle pi x radius 2nd power diameter of a circle: circumference / pi air velocity ft/min air velocity equation ft/min = cfm / duct area . volume: cfm = Cubic Feet per minute static pressure is measured in inch w.g. What does delta mean symbol triangle = difference pi = 3.14159 h.g. stands for: inches of mercury atmosphere pressure at sea level 14.7 psi 1psi = ( )w.g. 27.7612 w.g. 1psi = how many in h.g: feet of water: in of w.: h.g.29.92 33.9ft of water w.g.406.8 turn btu sensible equation into cfm equation btu = 1.08 x cfm x delta-t cfm = btu / 1.08 x delta-t latent heat also refers to humidity in the air psychrometer unit of measurement grains convert 10in by 8in sq duct from sq into sq ft. 10x8=1802ndp 180 x (1/144) = 1.25ft2ndp velocity = cfm / grill area in inch. that has been converted to sq ft.

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