Book 2: 1-01 - "Heat Gains & Losses" Flashcards
One of the ways that heat is transmitted is by:
Select one:
A. Insulation
B. Convection
C. Construction
D. Occupation
E. Conservation
B. Convection
The amount of outdoor ventilation air suggested by local codes varies from a minimum of _____ per person in places where there is no smoking.
Select one:
A. 12.6 m³/h (7.4 ft³/m)
B. 50 m³/h (30 ft³/m)
C. 5 m³/h (3 ft³/m)
D. 10.5 m³/h (6.2 ft³/m)
E. 85 m³/h 50 ft³/m)
A. 12.6 m³/h (7.4 ft³/m)
Thermal conductance (C) is the:
Select one:
A. 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)
B. Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/m°C) (Btu/hr/ft²°F)
C. 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)
D. 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)
E. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)
C. 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)
The wind velocity used to calculate summer infiltration heat gains is:
Select one:
A. 20 km/h (12.4 mph)
B. 24 km/h (14.9 mph)
C. 15 km/h (9.3 mph)
D. 10 km/h (6.2 mph)
E. 12 km/h (7.5 mph)
E. 12 km/h (7.5 mph)
The leakage of outdoor air into a building through cracks and openings is called:
Select one:
A. Conduction
B. Infiltration
C. Convection
D. Occupation
E. Radiation
B. Infiltration
Thermal transmittance or U-factor (U) is the:
Select one:
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. 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)
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. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)
E. 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)
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)
The forcing of air into a building by means of fans is called:
Select one:
A. Occupation
B. Infiltration
C. Convection
D. Radiation
E. Ventilation
E. Ventilation
Building air infiltration should be kept to a minimum, (however*) a certain amount of fresh air is required to provide _____ within the building.
Select one:
A. Heating
B. Ventilation
C. Dust control
D. Cooling
E. Humidification
Question is worded oddly, added text for clarity.
B. Ventilation
Heat passes through building walls, ceilings, and floors from the warmer inner surfaces to the cooler outer surfaces by:
Select one:
A. Construction
B. Insulation
C. Occupation
D. Conservation
E. Conduction
E. Conduction
Building external heat gains include those by:
Select one:
A. Convection
B. Friction
C. Solar radiation
D. Construction
E. Occupation
C. Solar radiation
Heat losses through large, single-pane window sections are times as great as through ordinary walls.
Select one:
A. 5
B. 4
C. 6
D. 2
E. 3
B. 4
One of the advantages of introducing a controlled amount of ventilation air into a building is:
Select one:
A. The ventilation air is introduced through the air conditioning equipment maintain a negative pressure within the building
B. The air will not have to be heated in winter
C. The air will not have to be cooled in summer
D. The positive pressure will cause an outward escape of air through cracks, windows, and doors, and increase infiltration
E. Ventilation air can be filtered reducing the labour and expense involved in cleaning and redecorating
E. Ventilation air can be filtered reducing the labour and expense involved in cleaning and redecorating
The amount of outdoor ventilation air suggested by local codes varies from a minimum of _____ per person in places where there is no smoking.
Select one:
A. 10.5 m³/h (6.2 ft³/m)
B. 50 m³/h (30 ft³/m)
C. 85 m³/h 50 ft³/m)
D. 5 m³/h (3 ft³/m)
E. 8.5 m³/h (5 ft³/m)
E. 8.5 m³/h (5 ft³/m)
Building heat losses can be reduced to a large extent by adding a layer, or layers, of:
Select one:
A. Glass
B. Building wrap
C. Paint
D. Insulation
E. Wall paper
D. Insulation
Thermal transmission or rate of heat flow is the:
Select one:
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. 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)
E. 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)
B. Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)
