Manual N Flashcards

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1
Q

You are asked to cool a room in a pump house that contains 10, 20hp pump motors that are inside the space to be conditioned. What is the total sensible load of the pump motors in btu?

A

585,000btu/h

Pg. 413 Manual N

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2
Q

What is the recommended indoor relative humidity and dry bulb temperature in a museum rare book vault?

A

70-72 DB 45 degrees RH

Pg. 493 Manual N

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3
Q

The exhaust rate for a sports locker room in educational occupancies is________.

A

.50cfm/sqft

Pg. 479 Manual N

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4
Q

According to ACCA Manual N, what is the summer design conditions in Greensboro, North Carolina?

A

90DB, 74WB

Pg. 255 Manual N

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5
Q

What is the heat gain for the lights in a room when twenty fluorescent fixtures with standard ballasts and 2-48in T-12 Fluorescent bulbs per fixture are in the room?

A

6279.92
20 Fixtures x 92Watts/fixture = 1840Watts
1840W x 3.413 = 6279.92btu
Pg. 407 Manual N

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6
Q

Per Manual N, a large store has 235 occupants, how many btu/h of latent heat will the occupants generate?

A

76,375btu/h
325btu/h latent heat per hour x 235people = 76375
Pg. 410
Manual N

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7
Q

A building used for light industrial assembly in Asheville, NC has a roof deck that sits on structural steel with a suspended ceiling below. The roof deck consists of 1.5in thick wood with R-3 insulation board and a suspended ceiling below with R-19 insulation located on the ceiling tile. What is the heat loss for this assembly on a design winter day if the roof measures 250ft by 40ft and the indoor temperature is to be maintained at 70⁰?

A
19,980btu/h
HTM = U-value x (ΔT)
HTM = .037 x (70 - 16)
HTM = .037 x 54
HTM = 1.998
BTUH = HTM x Area
BTUH = 1.998 x (250 x 40)
BTUH = 1.998 x 10,000ft²
BTUH = 19,980
Pg. 361 & 335 Manual N
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8
Q

A commercial wall is constructed of 8in block with filled cells, it has steel studs on the inside with R-13 cavity insulation, stucco finish on the outside and gypsum board on the inside. The building is located in Asheville, NC and the wall faces east and is 500ft². The building is used for an office so what is the heat loss on this wall on a design winter day?

A
2,403btu/h
HTM = U-value x (ΔT)
HTM = .089 x (70 - 16)
HTM = .089 x 54
HTM = 4.806
BTUH = HTM x Area
BTUH = 4.806 x 500ft²
BTUH = 2,403
Pg. 255, 335, 339 Manual N
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9
Q

A furniture store in Greensboro, NC has 1/8in thick clear, double pane, fixed sash glass in a metal frame with a thermal break. The glass is ten feet tall by 40ft long and has a 10ft horizontal projection mounted 2ft above the glass. What is the total heat loss on the glass?

A
12,852btu/h
Heat Loss HTM = U-value x (ΔT)
Design temp = 19
Default indoor = 70
HTM = .63 x (70 - 19)
HTM = .63 x 51
HTM = 32.13
BTUH = HTM x Area
BTUH = 32.13 x (10 x 40)
BTUH = 32.13 x 400
BTUH = 12,852
Pg. 255, 297 Manual N
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10
Q

A warehouse that is 50f by 75ft is made of 12in thick open cell concrete block with no interior or exterior finish and has no insulation, with a ceiling height of 12ft. What is the heating load for the walls only if the indoor temperature is to be maintained at 60⁰ in Asheville, NC if the net wall area is 33,750ft²?

A
867,240btu/h
HTM = U-value x (ΔT)
HTM = .584 x (60 - 16)
HTM = .584 x 44
HTM = 25.696
BTUH = HTM x Area
BTUH = 25.696 x 33,750ft²
BTUH = 867,240
Pg. 255, 335, 336 Manual N
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11
Q

What is the heat gain in btu/h for a dark colored commercial roof sitting on structural framing with a suspended ceiling below dead airspace if the roof deck is made of 1.5in wood with R-20 insulation board and R-13 on the suspended ceiling. The roof is 65ft by 65ft in Wilmington, NC on a summer design day with an indoor temperature of 75⁰

A
2,981btu/h
HTM = U-value x CLTD
CLTD = 36⁰ Assuming it's mid day 3pm
Adjusted for dark roof CLTD =
(Table CLTD x Color Factor) + (summer design temp - 95) + (75 - indoor design temperature) + Daily Range Adjustment
Adjusted CLTD = (36 x 1.2(Dark Roof)) + (91 -95) + (75 - 75) No daily range adjustment due to it being Medium
Adjusted CLTD = 43.2 + (-4) + 0
Adjusted CLTD = 39.2
HTM = .018 x 39.2
HTM = .7056
BTUH = HTM x Area
BTUH = .7056 x (65 x 65)
BTUH = .7056 x 4225
BTUH = 2981
Pg. 255, 362, 380 Manual N
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