# Heating and Cooling of the Buildings

## Quiz Questions

 1. The purpose of the air-conditioning system of a building is to provide complete thermal comfort for its occupants. Therefore, we need to understand the thermal aspects of the human body in order to design an effective air-conditioning system. True False 2. The set of extreme outdoor conditions under which a heating or cooling system must be able to maintain a building at the indoor design conditions is called the _______________ ? Indoor design conditions Outdoor design conditions Desirable design conditions None of the above 3. From the below picture which of the following statements is true ? Light-colored buildings absorb most of the incident solar radiation whereas dark colored ones reflect most of it. Dark-colored buildings absorb most of the incident solar radiation whereas light colored ones reflect most of it. Dark-colored buildings and light colored absorb equally and reflect unequally. Dark-colored buildings and light colored reflect equally and absorb unequally. 4. The unit thermal resistance of a plane layer of thickness L and thermal conductivity k can be determined from the formula ________ ? R = L/k R = k/L L = R/k k = R/L 5. Radiation heat transfer between the ceiling and the roof can be minimized by covering at least one side of the attic (the roof or the ceiling side) by a reflective material, called________ ?, such as aluminum foil or aluminum coated paper. radiant barrier cold barrier hot barrier metal barrier 6. From the following figure, what is the formula for total resistance? Rtotal = 1/(Rinside + Rglass + Routside) Rtotal = Rinside – Rglass + Routside Rtotal = Rinside + Rglass + Routside Rtotal = (Rinside + Rglass )/Routside 7. What is the value of Stefan-Boltzmann constant ? 5.67 x 10-8 W/m2 K4 10 x 10-8 W/m2 1 5.67 x 10-8 W/m2 8. Most older homes and some poorly constructed new ones have numerous cracks, holes, and openings through which cold outdoor air exchanges with the warm air inside a building in winter, and vice versa in summer. This uncontrolled entry of outside air into a building through unintentional openings is called ___________ ? Irregulation Infiltration Circulation Aeration 9. Which of the following is used as a preventive method for infiltration? Caulking Weather forecasting Circulating All of the above 10. From the following figure , the most appropriate deduction is ______________ ? The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost. Therefore, more money should be allocated for Heating and cooling costs . The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost. Therefore, thermal comfort and thus productivity should not be risked to conserve energy. The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost .Therefore reduce the salaries and increase the budget for Heating and cooling costs. The heating and cooling cost of a commercial building constitutes about 1 percent of the total cost. Therefore, thermal comfort and thus productivity should be risked to conserve energy. 11. Which of the following method uses a steady state approach while estimating the annual energy consumption of a building? Variable approach method Degree-day or degree-hour method Isolated method Steady responsive method 12. Which of the following is a dynamic method used to estimate the annual energy consumption of a building? Variable speed method Isolated method Transfer function method Degree-day or degree-hour method 13. The average annual energy consumption is based on average usage situations under average weather conditions. True False 14. Weather-stripping is a narrow piece of metal, vinyl, rubber, felt, or foam that seals the contact area between the fixed and movable sections of a joint. Weather-stripping method is used to prevent _____________ ? Thermal comfort Infiltration Deterioration All of the above. 15. Clear glass is preferred for showrooms since it affords maximum visibility from outside, but bronze-, gray-, and green-colored glass are preferred in office buildings since they provide considerable privacy while reducing glare. True False