Energy Code

Question 1

When running a residential load estimate for climate zone 3 in NC, what is the minimum solar heat gain coefficient you can use for the glass?

Answer 1

.30

Pg. R-16 Energy Code

Question 2

A residential air to air heat pump has an 8KW electric heater used for supplementary heat. What is the lowest temperature you can set the outdoor thermostat that controls the use of the electric heater?

Answer 2

35 degrees

Pg. C-37 Energy Code

Question 3

What is the minimum vapor compression efficiency of a 120,000 btu unit at 17 degree outdoor temperature as of 01-01-2016?

Answer 3

2.25

Pg. C-30 Energy Code

Question 4

What is the minimum thickness of pipe insulation on a 3in chilled water supply pipe located inside a building?

Answer 4

1.5in

Pg. C-39 Energy Code

Question 5

When installing refrigerant suction lines larger than

1-3/8, the insulation on the suction line must be at least ______ thick.

Answer 5

1-1/2

Pg. C-39 Energy Code

Question 6

When leak testing high pressure duct systems, what standard is used in North Carolina?

Answer 6

SMACNA HVAC Air Duct Leakage Test Manual

Pg. C-39 Energy Code

Question 7

In residential HVAC systems, when pipes carry fluids above 105⁰ and below 55⁰, a minimum of _______ pipe insulation is required.

Answer 7

R-3

Pg. R-23 Energy Code

Question 8

What is the minimum COP for a PTHP Heat Pump for a commercial new construction project?

Answer 8

3.2

Pg. C-31 Energy Code

Question 9

Is an outdoor air economizer required on a data processing center in climate zone 4 when 40% RH is required indoors in all seasons and the equipment consists of 13, 15 Ton DX rooftop cooling units?

Answer 9

No

Pg. C41 Energy Code

Question 10

Supply air ductwork run through a ventilated crawl space in residences in climate zone 4 requires what R-value insulation?

Answer 10

R-8

Pg. R-22 Energy Code

Question 11

What is the minimum pipe insulation thickness for a 42⁰ 2in chilled water line that runs from the chiller barrel to a remote air handler 65ft from the chiller?

Answer 11

1 ½in

Pg. C39 Energy Code

Question 12

What is the minimum AFUE rating required for a gas-fired forced air warm air furnace 120,000btu/h when applied in a commercial building?

Answer 12

78%

Pg. C-32 Energy Code

Question 13

A 1.25in diameter chilled water pip must be insulated with pipe insulation that is at least ______ thick

Answer 13

1.5in

Pg. C-39 Energy Code