Friday, May 30, 2008

Review Questions Tropical Design Part 1

1. A phenomenon where the urban temperature is hotter than rural temperature.
a) Albedo Effect
b) Urban Heat Island
c) Wind Shadow
d) Azimuth

2. The tendency of air or gas in a shaft or other vertical space to rise when heated, creating a draft that draws in cooler air or gas from below.
a) Coriolis force
b) Chimney Effect
c) Thermal Mass
d) Uniform Heat Emission

3. The total amount of rain, hail, snow, dew, measured in rain gauges and expressed in mm per unit time (day, month, year)
a) Cloud Cover
b) Precipitation
c) Humudity
d) Air Movement

4. Wind direction of Amihan.
a) NW
b) SE
c) SW
d) NE

5. Any cool mass that is available for the absorption of excess heat, including water bodies, the ground, and massive building materials.
a) Heat Sink
b) Water Features
c) Cooling Breezes
d) Radiant Cooling

6. Instrument used for measuring relative humidity
a) Thermometer
b) Hygrometer
c) Vane anemometer
d) Pyranometer

7. Wind direction of Habagat.
a) NW
b) SE
c) SW
d) NE

8. The temperature of the outside air in contact with a shaded wall or roof which would give the same rate of heat transfer and the same temperature gradient as the combined effect of solar radiation and air temperature.
a) Dry-Bulb Temperature
b) Wet-Bulb Temperature
c) Sol-Air Temperature
d) Surface Temperature

9. Measured by a pyranometer, on an unobstructed horizontal surface and recorded either as the continuously varying irradiance (W/m2), or through an electronic integrator as irradiance over the hour of the day.
a) Cloud Cover
b) Sunshine Duration
c) Dry-bulb Temperature
d) Solar Radiation

10. Integration in time of weather conditions, characteristics of a certain geographical location.
a) Climate
b) Temperature
c) Weather
d) Season

11. Maximum solar heat factor for roofs in warm humid tropics.
a) 3%
b) 4%
c) 5%
d) 6%

12. Regional climate
a) Mesoclimate
b) Macroclimate
c) Microclimate
d) Diurnal

13. Flow of heat through a material by transfer from warmer to cooler molecules in contact with each other.
a) Evaporation
b) Conduction
c) Convection
d) Radiation

14. Which of the following statements is not true?
a) Heat gain in the tropics is due mainly to solar radiation at the building surface.
b) In hot climates, heat gains are highest when there are low wind speeds.
c) Relative humidities in the tropical regions are very low.
d) Absorptivity of the surface to solar radiation is of primary importance in tropical regions.

15. Transfer of heat from one place to another by the flow of molecules from one place to another
a) Evaporation
b) Conduction
c) Convection
d) Radiation

16. Maximum solar heat factor for walls in warm humid tropics.
a) 4%
b) 5%
c) 6%
d) 7%

17. Range under which most people feel comfortable
a) “U” Value
b) Thermal Heat Capacity
c) Comfort Zone
d) Lowest DBT of the Year

18. What is the annual mean temperature if the highest DBT of the year is 37 oC and the lowest DBT is 16 oC?
a) 53 oC
b) 26.5 oC
c) 35 oC
d) 17.5 oC

19. What will be the center of the comfort range of the above in E.T. oC?
a) 23
b) 23.5
c) 23.82
d) 24

20. Rate of heat transfer that occurs through a unit thickness of material for a unit area subjected to a unit difference in temperature.
a) Conduction
b) Conductivity
c) Resistance
d) Resistivity

21. What is the conductivity of the wall with a thickness of 15cm, an area of 10sqm and temperature difference of 5 oC? in W/m oC
a) 0.003
b) 0.3
c) 13.33
d) 0.133

22. As a rough guide, the wind shadow will be _____ times the height of the building including the pitched roof.
a) 3
b) 4
c) 5
d) 6

23. Wind speed increases rapidly as the percentage opening area in walls increases from 0 to _____%.
a) 10
b) 20
c) 30
d) 40

24. Conductivity is equivalent to which of the following?
a) Per meter thickness / (area*temp difference)
b) Per meter thickness / (volume*temp difference)
c) Area / (per meter thickness*temp difference)
d) Volume / (per meter thickness*temp difference)

25. The rate of flow of radiant heat from the sun can be found from the ________ when it is placed over the sun path diagram.
a) Electromagnetic Waves
b) Conductivity
c) Radioactive Waves
d) Radiation Overlay

26. Angle of the sun above the horizon, measured from the horizon.
a) Azimuth
b) Sun Path
c) Latitude
d) Altitude

27. What is the resistivity of the wall with a thickness of 10 cm, an area of 15 sqm and temperature difference of 3 oC? in m oC/W
a) 0.5
b) 0.03
c) 450
d) 4.5

28. Heat gain in the tropics is mainly due to what?
a) High Air Temperatures
b) Solar Radiation
c) High Humidity
d) Evaporation

29. Which of the following is true?
a) Resistivity is Proportional to Conductivity
b) Resistivity is Inversely Proportional to Conductivity
c) Resistivity is Equal to Conductivity
d) Resistivity is the Ability to Resist Radiation.

30. Wind speed __________ with the increase in height above the ground.
a) Increases
b) Decreases
c) Is not Affected
d) Deflects

31. What is the “U” value of a wall with an external surface resistance of 0.05, wall layers with total resistance of 0.21 and internal surface resistance of 0.12 and a wall thickness of 0.25m? (resistance in m2 oC / W)
a) 0.38
b) 0095
c) 10.52
d) 2.63

32. What is the resistance of a brickwork wall layer if the thickness is 20cm and resistivity is 0.83m oC / W? (in m2 oC / W)
a) 16.6
b) 0.166
c) 0.042
d) 4.15

33. What is the rate of heat flow Q through a wall if there is a steady temperature difference of 15 oC between the inside and outside of such a wall and the area of the wall is 40sqm and a “U” value of 2.2 W / m2 oC and a wall thickness of 20cm? (in Watts)
a) 6600
b) 66
c) 264
d) 1320

34. Results from the movement of molecules by pumps, fans, or other movement caused by external forces.
a) Hot Air Rising
b) Conductance
c) Natural Convection
d) Forced Convection

35. What is the sol-air temperature if the outside wall surface resistance is 0.05m2 oC / W. a maximum radiation of 500 W/ m2; an absorptivity of 0.35; an outside temperature of 25 oC; and thickness of wall of 20cm? (in oC)
a) 33.75
b) 6.75
c) 168.75
d) 13.75

36. Angle of the position of the sun along the horizon, measured to the east or west from true south.
a) Azimuth
b) Altitude
c) Latitude
d) Sun path

37. What is the resistivity of the wall with a thickness of 10cm, an area of 15sqm and temperature difference of 3 oC? in m2 oC/W
a) 4.5
b) 0.45
c) 450
d) 45

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