Equations and Conversions

Question 1

What is the equation for wall assembly thermal resistance of a series of components?

Answer 1

R EFFECTIVE-SERIES = R1 + R2 +R3

Question 2

WHAT IS THE EQUATION FOR THERMAL RESISTANCE OF PARALLEL COMPONENTS IN A WALL SERIES?

Answer 2

R-EFFECTIVE/PARALLEL = 1
—————————————–
A1/Atotal X 1/R1 + A2/Atotal x 1/R2

Question 3

What is the equation for thermal resistance for a mixture of components in parallel and series?
*remember to pay attention to heat flow area in the question :)

Answer 3

Add all components in the series, and calculate areas for parallel components. Combination of series and parallel.

R effective = R1 + 1 + R4
—————————————–
A2/Atotal X 1/R2 + A3/Atotal x 1/R3

Question 4

What are the equations for area and perimeter of a rectangle?

Answer 4

A = b x h

P = 2 ( b x h )

Question 5

What is the perimeter and area of a triangle

Answer 5

non-hypoteneuse:
A = (b x h )/2
P = a + b + c

Hypotenuse:

A = (b x a)/2
P = a + b + c
c2 = a2 + b2

Question 6

What is the area and perimeter of a trapezoid?

Answer 6

A = (b + B)/2 x h
P = (2 x a) + b + B

Question 7

What is the area and perimeter of a circle?

Answer 7

A = pi x r2
P = 2 x pi x r

Question 8

1 inch in cm?

Answer 8

2.54 cm

Question 9

1 foot in m?

Answer 9

0.3048 m

Question 10

1 inch-squared in cm squared?

Answer 10

6.45 cm squared

Question 11

1 ft squared in m squared?

Answer 11

0.0929 m squared

Question 12

1 ft cubed in m cubed?

Answer 12

0.0283 m cubed

Question 13

1 US gallon in litres?

Answer 13

3.7854 litres

Question 14

1 lb in kg?

Answer 14

0.4536 kg

Question 15

1 US ton in t?

Answer 15

0.9072 t

Question 16

1 BTU in J?

Answer 16

1055J

Question 17

1 BTU/h in W?

Answer 17

0.293 W

Question 18

1 m cubed in liters?

Answer 18

1000litres

Question 19

1 R in RSI?

Answer 19

0.1761 RSI

Question 20

How is U-factor measured?

Answer 20

ufactor measure the heat transfer per time, per area, and per degree of temperature difference in W/msquaredK(Btu/h ftsquared F)

Question 21

Convert U-factor in Btu/h ftsquared F to W/msquared K.

Answer 21

Multiply Btu/h ftsquared F by 5.678

Question 22

How do you calculate the total heat transfer through fenestration?

Answer 22

The u-factor(BTU/hrftsquared F) multiplied by the interior-exterior temperature product area yields the total heat transfer through the fenestration.

Question 23

THe U-factor is the reciprocal of?

Answer 23

R-value:

U = 1/R

Question 24

Equation for load factor?

Answer 24

LF = [kWh/h]/kWpeak

Question 25

kJ to Btu

Answer 25

kJ x 0.948 = Btu

Question 26

kJ to kWh

Answer 26

kJ/3600 = kWh

Question 27

kW to Btu/h

Answer 27

kW x 3412 = Btu/h

Question 28

kW to Horsepower

Answer 28

kW x 1.34 = horsepower