CIVMECH QUIZ

A. Air Conditioning Duct Design (60%)
1. Using equal friction method, determine the sizes of the main ducts and branch ducts of the air conditioning system for the one-storey office building shown in the attached plan.. Summarize the dud sizes on the table provided. Use 12 inches as the initial duct depth.
2. Determine the initial duct velocity and the friction loss.
3. Determine the longest duct run and calculate the total static pressure in in.wg required at the fan discharge if 0.16 in.wg is the operating pressure for all the terminals.
4. Assuming that by replacing the filter of an air-handling unit with one that will substantially improve the air quality will require the use of a larger motor for the fan to overcome frictional losses, how will you balance these two important concerns? Which of the two concerns will you prioritize? Why? Cite specific canon/rule in the Code of Ethics to support your answer.

B. Answer the following questions briefly. (40%)
1. Give the qualitative and quantitative definitions of indoor air quality.
2. Enumerate five common air contaminants.
3. Differentiate supply air and ventilation air, and infiltration and exfiltration.
4. Explain the use of outdoor air as a method to control contaminants.
5. Give the general rules as far as dud and refrigerant piping design are concerned.

 

CIVMECH FINAL EXAM Instruction:
Open charts and table only.

I. Cooling Load Calculations ~(35%)
A. Calculate the cooling load requirement in tons of refrigeration (TR) of V211 Drafting room shown in the figure. (25%) Design Conditions 75°F, 50%RH, 95°F DB, 80°F WB Space dimension 50 ft x 25 ff Ceiling height 10 ff Single glazed windows Oft x 2ft (each window) (with inside shades) Walls of medium construction, without insulation Assume doors as part of walls Unconditioned space below 24 fluorescent lights, 40 watts each Maximum occupancy = 46 persons Add 10% allowance in the grand total heat.
B. Determine the sensible heat due to occupancy (5%)
C. Determine the latent heat due to ventilation (5%)

II. Air Conditioning Duct Design (35%)
A. Using equal friction method, determine the sizes of the main ducts and branch duds of the air conditioning system for V211. Summarize the duct sizes on the table provided. Use 10 inches as the initial duct depth. (25%)
B. Determine the initial duct velocity. (5%)
C. Calculate the total static pressure in in.wg required at the fan discharge if 0.16 in.wg is the operating pressure for all the terminals. (5%)

III. Answer the following questions briefly (30%)
A. What is day lighting? What are the two forces trying to reverse the trend of using artificial lighting in favor of natural lighting?
B. What are the elements/features of an intelligent building? Briefly describe BAS.
C. Enumerate the functions of a machinery foundation as well as the general factors affecting the weight of foundation.
D. Define Sick Building Syndrome (SBS). Enumerate the common contaminants found in a sick building.
E. Enumerate the features/elements of a well-designed building. What governs the designing of such features/elements? What is the engineer's primary consideration in designing such features/elements? Should the engineer adhere to the legal requirements at all times? What justifies the engineer's going beyond what the law requires? Elaborate your answer.