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systems analysis and design
Analysis And Design Of Information Systems 3rd Edition Arthur M. Langer - Solutions
=+5-35.A large beverage cooler resembles a small building and is to be maintained at about 35 F (2 C)and a low relative humidity. The walls and ceiling are well insulated and are finished on the inside with plywood. Assume that the outdoor temperature is generally higher than 35 F (2 C).
=+In what direction will moisture tend to migrate? Where should the vapor retardant be located?
=+Explain what might happen if the retardant is improperly located.
=+5-36.Consider the wall section shown in Fig. 5-10. (a) Compute the temperatures of surfaces 1 and
=+2. (b) Assuming that the moist air can diffuse through the gypsum and insulation from the inside, would you expect moisture to condense on surface 17 Explain. (c) Would moisture con-dense on surface 2? Explain. (d) Where should a vapor retardant be placed?
=+5-37.A building has floor plan dimensions of 30 × 60 ft. The concrete foundation has an average height of 2 ft. and the wall is 6 in. thick The infiltration rate is 20 cfm. Use a winter design temperature of 10 F and an indoor temperature of 72 F. Estimate the temperature in the crawl space.
=+5-38. Compute the temperature of the metal roof deck of the roof-ceiling assembly shown in Table
=+5-46 when the outdoor temperature is 0 F ( 18 C) and the indoor temperature is 72 F (22 C)with RH of 45 percent, (a) with the rigid insulation (construction 2) and (b) without the insu-lation (construction 1). (c) Would you expect any condensation problems on the underside of the metal deck in
=+Consider the wall section shown in Fig. 5-4a, construction 1, and estimate the temperature of
=+5-39.the inside surface of the concrete block at the furring. The outdoor temperature is 1 F (-17 C)and the inside temperature is 72 F (22 C) with a relative humidity of 45 percent. Would you recommend a vapor retardant? If so, where would you place it? Explain.
=+5-40.Consider the knee space shown in Fig. 5-11. The vertical dimension is 8 ft. the horizontal dimension is 3 ft, and the space is 20 ft long. The walls and roof surrounding the space all have
=+an overall heat-transfer coefficient of about 0.09 Btu/(hr-ft2-F). Assuming an outdoor temper-ature of 0 F and an indoor temperature of 70 F. make a recommendation concerning the place-ment of water pipes in the knee space.
=+5-41.Estimate the temperature in an unheated basement that is completely below ground level with heated space above at 72 F (22 C). Assume no insulation and dimensions of 20 x 20 x 7 ft(6×6 × 2 m). The basement is located in Denver, CO, 40 deg. latitude, 105 deg. longitude.₹ = 10 F 4 =70 F$%
=+6-1.Select normal heating design conditions for the cities listed below. List the dry bulb tempera-ture, the mean wind speed and direction, and a suitable humidity ratio.(a) Pendleton, OR(d) Norfolk, VA(b) Milwaukee, WI(e) Albuquerque, NM(c) Anchorage, AK(f) Charleston, SC
=+6-2.Select an indoor design relative humidity for structures located in the cities given below.Assume an indoor design dry bulb temperature of 72 F. Windows in the building are double glass, aluminum frame with thermal break. Other external surfaces are well insulated.(a) Caribou, ME(e) San
=+6-3.A large single-story business office is fitted with nine loose-fitting, double-hung wood sash windows 3 ft wide by 5 ft high. If the outside wind is 15 mph at a temperature of 0 F, what is the percent reduction in sensible heat loss if the windows are weather stripped? Assume an inside
=+6-4.Using the crack method, compute the infiltration for a swinging door that is used occasionally.assuming it is (a) tight-fitting. (b) average-fitting, and (c) loose-fitting. The door has dimen-sions of 0.9 x 2.0 m and is on the windward side of a house exposed to a 13 m/s wind. Neglect
=+6.5.A room in a single-story building has three 2.5 × 4 ft double-hung wood windows of average fit that are not weather-stripped. The wind is 23 mph and normal to the wall with negligible pressurization of the room. Find the infiltration rate, assuming that the entire crack is admit-ting ait.
=+6-6.Refer to Example 6-1. (a) Estimate the total pressure difference for each wall for the third and ninth floors. (b) Using design conditions for Billings, MT, estimate the heat load due to infil-tration for the third and ninth floors.
=+6-7.Refer to Examples 6-1 and 6-2. (a) Estimate the infiltration rates for the windward and side doors for a low traffic rate. (b) Estimate the curtain wall infiltration for the first floor. (c) Com-pute the heating load due to infiltration for the first floor if the building is located in
=+6-8.A 20-story office building has plan dimensions of 100 × 60 ft and is oriented at 45 degrees to a 20 mph wind. All windows are fixed in place. There are double vestibule-type swinging doors on the 60-ft walls. The walls are tight-fitting curtain wall construction, and the doors have about in.
=+v6-9.Refer to Problem 6-8. (a) Compute the heat gain due to infiltration for the first floor with the building located in Minneapolis, MN. (b) Compute the heat gain due to infiltration for the fif-teenth floor. (c) What is the heat gain due to infiltration for the twentieth floor?
=+6-10. Compute the transmission heat loss for the structure described below. Une design conditions recommended by ASHRAE Standards, Location:Des Moines, IA Walls:Table 5-4a, construction 2 Floor:Concrete slab with 2 ft. R-5.4, vertical edge insulation Windows:Double-insulating glass; } in. air
=+6-11.Compute the design infiltration rate and heat loss for the house described in Problem 6-10, assuming an orientation normal to a 15 mph wind. The windows and doors are tight fitting.
=+6-12.Rework Problem 6-10 for Halifax, Nova Scotia. Include infiltration in the analysis.
=+6-13.An exposed wall in a building in Memphis, TN, has dimensions of 10 x 40 ft (3 x 12 m) with six 3 × 3 ft (0.9×0.9 m) windows of regular double glass, 4 in, air space in an aluminum frame without a thermal break. The wall is made of 4 in. (10 cm) lightweight concrete block and face brick.
=+6-14.Consider Problem 6-13 with the wall located in Concord, NH. The air space between the block and the brick is filled with } in. (2 cm) of glass fiber insulation. Estimate the heat loss for the wall and glass.
=+6-15.Compute the heating load for the structure described by the plans and specifications furnished by the instructor.
=+6-16.A small commercial building has a computed heating load of 250,000 Btu/hr sensible and 30,000 Btu/hr latent. Assuming a 45 F temperature rise for the heating unit, compute the quan-tity of air to be supplied by the unit using the following methods: (a) Use a psychrometric chart with room
=+6-17. Suppose a space has a sensible heat loss of 100,000 Btu/hr (29 kW) but has a latent heat gain of 133,000 Btu/hr (39 kW). Air to ventilate the space is heated from 55 F (13 C), 35 percent relative humidity to the required state for supply to the space. The space is to be maintained al 75 F
=+7-1. Find the local solar time (LST) on August 21 for the following local times and locations:(a) 9:00 A.M. EDST, Norfolk, VA(b) 1:00 P.M. CDST. Lincoln, NE(c) 10:00 A.M. MDST, Casper, WY(d) 3:00 P.M. PDST, Pendleton, OR(e) 7:00 P.M ., British Summer Time, London, England (British Summer Time is
=+7-2. What are the hour angles corresponding to the following local solar times: (a) 8:19 A.M .,(b) 10:03 A.M ., (c) 3:46 P.M ., and (d) 12:01 P.M .?
=+7-3. Compute the time for sunrise and sunset on July 21 in (a) Billings, MT. (b) Orlando, FL,(c) Anchorage, AL, and (d) Honolulu, HL
=+7-4. Calculate the sun's altitude and azimuth angles at 9:00 A.M. solar time on September 21 at 33 deg N latitude.
=+7-5. Determine the solar time and azimuth angle for sunrise at 58 deg N latitude on (a) June 21 and(b) December 21.
=+7-6.On what month, day, and time does the maximum solar altitude angle B occur in (a) Denver.CO, (b) Lansing, MI, and (c) Sydney, Australia?
=+7-7. Compute the wall solar azimuth y for a surface facing 12 deg west of south located at 37.5 deg N latitude and 100 deg W longitude on November 21 at 3:30 p.M. Central Standard Time.
=+7-8.Calculate the angle of incidence for the surface of Problem 7-7 for (a) a vertical orientation and(b) a 20-deg tiit from the vertical.
=+7.9.For Ottawa, Ontario, on July 21, determine (a) the incidence angle of the sun for a horizontal surface at 4:00 P.M. Eastern Standard Time and (b) the time of sunset in Eastern Daylight Sav-ings Time,
=+7-10.Calculate the angle of incidence at 10:30 A.M. EDST on July 21 for Philadelphia, PA, for (a) a horizontal surface. (b) a surface facing southeast, and (c) a surface inclined 40 deg from the vertical and facing south.
=+7-11.Develop a computer program or spreadsheet to predict the altitude and azimuth angles for the sun for a user-specified standard time, latitude, longitude, and standard meridian.
=+7.12 Extend the functionality of the program or spreadsheet for Problem 7-11 to plot solar posi-tions for daylight hours. Check the results against the U.S. Naval Observatory (see http://aa_usno.navy.mil/data/docs/AltAz.html).
=+7-13.Calculate the total clear sky irradiation of a surface tilted at an angle of 60 deg from the hori-zontal located at Caribou, ME, on July 21 at 2:00 P.M. Eastem Daylight Savings Time. The sur-face faces the southwest. Neglect reflected radiation.
=+7-14.Compute the reflected irradiation of a window facing southwest over a large lake on a clear day. The location is 36 deg N latitude and 96 deg W longitude. The time is June 21 at 8:00 P.M.CDST. This near to sunset, the water will have a fairly high reflectance, approximately 0.25.
=+7-15.Determine magnitudes of direct, diffuse, and reflected clear-day solar radiation incident on a small vertical surface facing south on March 21 at solar noon for a location at 56 deg N lati-tude having a clearness number of 0.95. The reflecting surface is snow-covered ground of infi-nite
=+7-16.Estimate the total clear day irradiation of a roof with a one-to-one slope that faces southwest at 32 deg N latitude. The date is August 21, and the time is 10:00 A.M. LST. Include reflected radiation from the ground with a reflectance of 0.3.
=+7-17.Extend the program or spreadsheet from Problem 7-11 to also calculate direct and diffuse solar irradiation for clear-days incident on a surface with user-specified direction and tilt. Include reflected irradiation, and allow the solar reflectance to be specified as an input. Test for a
=+7-18. Determine the amount of diffuse, direct, and total radiation that would strike a south-facing sur-face tilted at 45 deg on a clear April 21 in Louisville, KY:(a) At 12 P.M. solar time(b) At 3:00 P.M. solar time(c) For all 24 hours
=+7-19.For all daylight hours, estimate the rate at which solar energy will strike an east-facing win-dow, 3 ft wide by 5 ft high, with no setback. Assume a clear July 21 day in Boise, ID.
=+7-20.A south-facing window is 4 ft wide by 6 ft tall and is set back into the wall a distance of 1 ft.For Shreveport, LA, estimate the percentage of the window that is shaded for(a) April 21, 9:00 A.M. solar time(b) July 21. 12:00 P.M. solar time(c) September 21, 5:00 P.M. solar time
=+7-21.Work Problem 7-20 assuming a long 2 ft overhang located 2 ft above the top of the window.
=+7-22.Work Problem 7-20 assuming a 6 in. setback for the window.
=+7-23. Work Problem 7-20 for a clear day on December 21.
=+7-24. Work Problem 7-20 assuming a long overhang of 3 ft that is 2 ft above the top of the window.
=+7-25. Extend the computer program or spreadsheet from Problem 7-17 to predict the fraction of sun-lit area of a vertical window that may face any arbitrary direction in the northern hemisphere.Allow the overhang and/or setback dimensions to be input. Demonstrate the program works by comparing to
=+7-26.Further extend the program or spreadsheet of Problem 7-17 to compute the transmitted and absorbed solar heat gain for glazing system 5b in Table 7-3 for all 24 hours of the day
=+7-27.For 3:00 P.M. solar time, on July 21, in Boise, ID, a 3 ft wide and 5 ft high window faces south-west. (Actually, it faces southwest all the time!) The inoperable window has a 2 in. wide alu-minum frame with a thermal break utilizing metal spacers. The glazing system is 21e in Table
=+7-3. There is no interior or exterior shading. Calculate the total solar heat gain, using the sim-plified approach.
=+7-28.For the window in Problem 7-27, calculate the transmitted and absorbed solar heat gain, using the detailed approach.
=+7-29.For the window in Problem 7-27, if light-colored Venetian blinds are added, what is the total solar heat gain? (Use the simplified approach.)
=+7-30.For the window in Problem 7-27. if light-colored Venetian blinds are added, what is the trans-mitted and absorbed solar heat gain? (Use the detailed approach.)
=+7-31.Work Problem 7-27 if the glazing system is 5b.
=+7-32. Work Problem 7-28 if the glazing system is 5b.
Does ISO 9000 need to be implemented in all areas of the business?Explain
What steps are necessary for an organization to adopt ISO 9000?
What is a job description matrix?
How are personnel affected by ISO 9000?
Why are forms used in ISO 9000?
Why are work flows the most critical aspect of developing the ISO 9000 model?
How is ISO 9000 incorporated into the life cycle?
What are the overall benefits of ISO 9000?
What are the three fundamental things that ISO 9000 tries to establish?
Explain why ISO 9000 represents a system of procedures.
What is the difference between a transaction database and a data warehouse?
Describe the philosophy of reengineering an enterprise system.
Describe the procedures to implement a pilot application. Why is this so important in BPR?
What is the significance of the spiral approach and how does it support the development of reusable objects?
Compare the SDLC with the OOLC.
What is the SDLC? Why is it called a waterfall approach?
How should BPR be introduced to users and IT personnel?
What is a CRUD diagram?
Explain the relationship between BPR and structured tools.
What is a business area?
How is BPR consistent with the object and client/server models.
Explain the objectives of BPR.
When should acceptance test plans be developed and by whom?
Why does acceptance test planning assist the budget process?
How can acceptance test plans strengthen the relationship with users?
Why is it important for the analyst to provide a budget for his/her tasks?
How do acceptance test plans facilitate productivity and quality of the programming phase?
What is meant by the concept of self-documentation and quality?
How does strategic testing relate to risk management?
Comment on the statement, “Cannot test 100% of everything.”
What is an acceptance test plan?
How does modeling provide the input of the system’s documentation?
What are object databases?
What four methods can be used to design a cohesive object?
How does the concept of cohesion relate the structured approach to the object model?
What is coupling and cohesion? What is their relationship with each other?
How does functional decomposition operate with respect to classes and objects?
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