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Book 2 PanGlobal Assessment Test > Chapter 1 Heat Gains & Losses > Flashcards

Chapter 1 Heat Gains & Losses Flashcards

1
Q

1.Thermal conductivity (λ) is the:

A. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)

B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)

C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F).

D. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)

E. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr

A

C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F).

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2
Q
  1. Thermal transmission or rate of heat flow is the:

A. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)

B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)

C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F)

D. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)

E. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr)

A

B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)

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3
Q
  1. Thermal conductance (C) is the:

A. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)

B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)

C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F)

D. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)

E. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr)

A

D. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)

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4
Q
  1. Conduction heat gains are based on the assumption that the temperature of the outer surface of the building is the same as the:

A. Coldest winter temperature

B. Warmest summer temperature

C. Average of winter and summer temperatures

D. Indoor design temperature

E. Outdoor design condition

A

E. Outdoor design condition

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5
Q
  1. Heat passes through building walls, ceilings, and floors from the warmer inner surfaces to the cooler outer surfaces by:

A. Construction

B. Conservation

C. Occupation

D. Insulation

E. Conduction

A

E. Conduction

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6
Q
  1. Building heat losses can be reduced to a large extent by adding a layer, or layers, of:

A. Insulation

B. Paint

C. Wall paper

D. Glass

E. Building wrap

A

A. Insulation

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7
Q
  1. One of the methods of estimating the quantity of air entering a building by means of infiltration is the _____ method.

A. Infiltration

B. Radiation

C. Crack

D. Occupation

E. Convection

A

C. Crack

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8
Q
  1. Thermal transmittance or U-factor (U) is the:

A. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)

B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)

C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F)

D. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)

E. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr

A

A. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)

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9
Q
  1. Building external heat gains include those by:

A. Construction

B. Friction

C. Occupation

D. Solar radiation

E. Convection

A

D. Solar radiation

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10
Q
  1. The forcing of air into a building by means of fans is called:

A. Infiltration

B. Ventilation

C. Radiation

D. Convection

E. Occupation

A

B. Ventilation

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11
Q
  1. Heat energy always moves from:

A. A warmer source to a cooler source

B. Lower levels to higher levels

C. A cooler source to a warmer source

D. Higher levels to lower levels

E. Outside to inside

A

A. A warmer source to a cooler source

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12
Q
  1. The wind velocity used to calculate summer infiltration heat gains is:

A. 12 km/h (7.5 mph)

B. 10 km/h (6.2 mph)

C. 24 km/h (14.9 mph)

D. 20 km/h (12.4 mph)

E. 15 km/h (9.3 mph)

A

A. 12 km/h (7.5 mph)

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13
Q
  1. Building air infiltration should be kept to a minimum a certain amount of fresh air is required to provide _____ within the building.

A. Heating

B. Ventilation

C. Cooling

D. Dust control

E. Humidification

A

B. Ventilation

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14
Q
  1. One of the ways that heat is transmitted is by:

A. Construction

B. Occupation

C. Insulation

D. Convection

E. Conservation

A

D. Convection

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15
Q
  1. Thermal resistance (R) is the:

A. Thermal heat flow (transmission) through unit areas of a wall, door, window, etc., for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m²K or W/m²°C) (Btu/hr/ft²R or Btu/hr/ft²°F)

B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)

C. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F)

D. Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m²°C) (Btu/hr/ft²°F)

E. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr)

A

E. Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m²°C/W) (ft²°F/Btu/hr)

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16
Q
  1. The amount of heat lost by conduction, convection, radiation, and infiltration is directly affected by the:

A. Room temperature

B. Room size

C. Ambient temperature

D. Angle of the sun

E. Wind velocity

A

E. Wind velocity

17
Q
  1. Heat losses through large, single-pane window sections are times as great as through ordinary walls.

A. 6

B. 2

C. 5

D. 4

E. 3

18
Q
  1. One of the advantages of introducing a controlled amount of ventilation air into a building is:

A. Ventilation air can be filtered reducing the labour and expense involved in cleaning and redecorating

B. The air will not have to be cooled in summer

C. The air will not have to be heated in winter

D. The ventilation air is introduced through the air conditioning equipment maintain a negative pressure within the building

E. The positive pressure will cause an outward escape of air through cracks, windows, and doors, and increase infiltration

A

A. Ventilation air can be filtered reducing the labour and expense involved in cleaning and redecorating

19
Q
  1. Building heat losses can be reduced to a large extent by adding a layer, or layers, of:

A. Insulation

B. Paint

C. Wall paper

D. Glass

E. Building wrap

A

A. Insulation

20
Q
  1. Building external heat gains include those by:

A. Construction

B. Friction

C. Occupation

D. Solar radiation

E. Convection

A

D. Solar radiation

Book 2 PanGlobal Assessment Test (40 decks)

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