Questions and Answers of Mechanical And Electrical Systems In Architecture Engineering And Construction

Describe a ton of refrigeration.
Describe why oversizing of cooling equipment is a problem.
Identify the design conditions at the geographical location where you reside.
Define the CLTD.
Define the GLF.
How does the orientation of the windows in the building affect the heat gain?
Why must the number of occupants and the type of activity be considered in a heat gain calculation?
How is infiltration calculated for heat gain, and how does this compare with infiltration heat load calculations?
Find the CLTD for a wood-framed single-family detached residence at the geographical location where you reside, for exterior walls with the following orientations:a. Facing southb. Facing northc.
Find the CLTD for a wood-framed single-family detached residence in Houston, Texas, for exterior walls with the following orientations:a. Facing southb. Facing northc. Facing eastd. Facing west
Find the CLTD for a wood-framed single-family detached residence in Newark, New Jersey, for exterior walls with the following orientations:a. Facing southb. Facing northc. Facing eastd. Facing west
Find the CLTD for a wood-framed single-family detached residence in Phoenix, Arizona, for exterior walls with the following orientations:a. Facing southb. Facing northc. Facing eastd. Facing west
A wood-framed single-family detached residence in Houston, Texas, has a south-facing wall with a net exposed area of 100 ft2. The wall has an Rt of 15.1 hr · ft2 · °F/Btu. Determine the sensible
A wood-framed single-family detached residence in Austin, Texas, has a south-facing wall with a net exposed area of 100 ft2. The wall has an Rt of 15.1 hr · ft2 · °F/Btu. Determine the sensible
A wood-framed multifamily residence in Columbus, Ohio (about 40° north latitude), has a room with southfacing windows. The fixed windows are regular double glass with a total glass area of 100 ft2.
A wood-framed multifamily residence in Savannah, Georgia (about 32° north latitude), has a room with south-facing windows. The fixed windows are regular double glass with a total glass area of 100
A well-built, wood-framed, single-family detached residence in Savannah, Georgia, has a 12 ft by 20 ft family room with 10 ft high ceilings. The target inside design temperature is 75°F. Determine
A single-family detached residence of moderate construction has a total sensible load of 53 300 Btu/hr. The design humidity ratio is 0.021 lb of vapor/lb of dry air.a. Determine the latent load.b.
Approximate the sensible cooling load attributed to lighting, appliances and equipment in a two bedroom, dwelling unit in an apartment.
Approximate the annual energy consumption and annual cost of operation of an air conditioner with an SEER of 13 that is serving a cooling load of 36 000 Btu/hr. Use an energy cost of $0.10/kWh.a. For
Approximate the annual energy consumption and annual cost of operation of an air conditioner with an SEER of 13 that is serving a cooling load of 36 000 Btu/hr. Use current electricity costs. (It
A church sanctuary is designed for an occupancy of 300 persons. The outside airflow rate is 15 cfm per person. The inside design temperature is 74°F and the outside air design temperature is 89°F.
Calculate the cooling load for the residence in Appendix D. Assume the residence will be built at the geographical location where you reside.
Calculate the cooling load for a top-floor apartment and an apartment that is below the top floor, using the apartment building in Appendix A. Assume the residence will be built at the geographical
What is a boiler and what does it produce?
Describe the types of boilers.
Identify and explain types of boiler ratings.
What is a warm-air furnace and what does it produce?
Describe the types of warm-air furnace classifications based on the direction of airflow for the supply air.
Describe the types of furnace efficiency classifications.
How do boilers and furnaces differ?
Describe the difference between an air-source heat pump and a geothermal heat pump.
Describe the function of an infrared heater and identify where it can be used effectively.
What is a chiller and what does it produce?
What is the vapor-compression refrigeration cycle?
In a vapor-compression refrigeration system, what is the function of the following components?a. Evaporatorb. Condenserc. Compressord. Expansion valve
What is a roof top unit?
What type of system is most commonly used for residential cooling?
When might a chilled water system be used?
What is a cooling tower and how does it function?
Explain the performance ratings used for air conditioners and heat pumps.
Explain the difference between a mechanical (vapor compression refrigeration) chiller and an absorption chiller.
What is an evaporative cooler and how does it function?
Describe ice thermal storage system.
Define and describe the difference between building heat loss and building heat load.
What is infiltration heat loss, and where does it occur in a building?
What is transmission heat loss, and where does it occur in a building?
Describe the differences between the center-of-wall R-value, clear-wall R-value, and whole-wall R-value.
Determine the rate of conduction heat transfer through 1 ft2 of the following materials. Assume the surface temperatures of the materials are 30° and 72°F.a. 31⁄2 in brickb. 8 in normal weight
Determine the rate of conduction heat transfer through 1 m2 of the following materials. Assume the surface temperatures of the materials are - 1° and 22°C.a. 87.5 mm brickb. 200 mm normal weight
A residence has a 2000 ft2 floor area and 8 ft high ceilings. Inside air inside temperature is 70°F and outside ambient temperature is 10°F. Assume the heat capacity of air is 0.018 Btu/ft3 · °F.
A residence has a 210 m2 floor area and 2.5 m high ceilings. Inside air inside temperature is 21°C and outside ambient temperature is - 5°C. Assume the heat capacity of air is 0.35 W/m3 °C.
Surfaces emit radiant energy at the following temperatures. Determine the wavelength of maximum radiative power and the type of radiation emitted (e.g., visible light, UV, IR) by the predominant
Surfaces emit radiant energy at the following temperatures. Determine the wavelength of maximum radiative power and the type of radiation emitted (e.g., visible light, UV, IR) by the predominant
Find the thermal resistance (R) values of the following materials:a. 8 in thick lightweight concrete blockb. 3⁄8 in thick plywoodc. 2 × 8 (71⁄4 in actual thickness) softwood lumberd. 3⁄4 in
For the following surfaces, find the thermal resistance (R) of the following air films and confining air spaces (cavities) in U.S. units:a. Interior painted gypsum wallboard (nonreflective) wall
Find the thermal resistance (R) values of the following materials:a. 200 mm thick lightweight concrete blockb. 9 mm thick plywoodc. 89 mm thick softwood lumberd. 25 mm thick fiberglass insulation
For the following surfaces, find the thermal resistance (R) of the following air films and confining air spaces (cavities) in metric (SI) units:a. Interior painted gypsum wallboard (nonreflective)
From the tables provided in this text, find the total thermal resistance (Rt) and overall coefficient of heat transmission (U) of the following windows and doors in U.S. units:a. Double insulating
From the tables provided in this text, find the total thermal resistance (Rt) and overall coefficient of heat transmission (U) of the following windows and doors in metric (SI) units:a. Double
An uninsulated solid load-bearing masonry wall is constructed of a 1⁄2 in stucco exterior finish on 8 in standard weight concrete block (CMU) and 5⁄8 in gypsum wallboard.a. Determine the Rt-value
A solid load-bearing masonry wall is constructed of 4 in face brick, 8 in standard weight concrete block, 2 in expanded polystyrene insulation board (unfaced), and 5⁄8 in gypsum wallboard.a.
A solid load-bearing masonry wall is constructed of 4 in face brick, 4 in standard weight concrete block, 31⁄2 in fiberglass batt insulation, and 5⁄8 in gypsum wallboard.a. Determine the Rt-value
A cavity masonry wall is constructed of 4 in face brick, 11⁄2 in hollow (air) cavity, 4 in standard weight concrete block, 31⁄2 in fiberglass batt insulation, and 5⁄8 in gypsum wallboard.a.
An insulated wall is constructed of 11 mm hardboard lapped siding, 19 mm extruded polystyrene insulation board sheathing, 89 mm fiberglass batt insulation, a vapor retarder (plastic film), and 13 mm
An insulated wall is constructed of 7⁄16 in hardboard lapped siding, 3⁄4 in foil-faced (both sides) polyisocyanurate insulation board sheathing, 31⁄2 in cellulose insulation, a vapor retarder
A commercial roof is constructed of a single-ply roof membrane, 4 in fiberglass insulation sheathing board, and 6 in cast-in-place concrete deck.a. Determine the Rt-value and U-factor for this
An insulated wall is constructed of 7⁄16 in hardboard lapped siding, 1⁄2 in OSB sheathing, 51⁄2 in fiberglass batt insulation, a vapor retarder (plastic film), and 1⁄2 in gypsum board. The
An insulated wall is constructed of 7⁄16 in hardboard lapped siding, 1⁄2 in OSB sheathing, 51⁄2 in fiberglass batt insulation, a vapor retarder (plastic film), and 1⁄2 in gypsum board. The
A solid load-bearing masonry wall is constructed of 4 in face brick, 8 in standard weight concrete block, 2 in expanded polystyrene insulation board (unfaced), and 5⁄8 in gypsum wallboard.
An insulated wall is constructed of 11 mm hardboard lapped siding, 19 mm extruded polystyrene insulation board sheathing, 89 mm fiberglass batt insulation, a vapor retarder (plastic film), and 13 mm
List some of the ways in which the heat loss of a building can be controlled.
Explain how thermal insulation restricts the flow of heat.
Describe the difference between lightweight and heavyweight building construction, as associated with:a. Embodied energyb. Energy use
With respect to energy use, describe the difference between external-load-dominated and internal load dominated buildings.
Define embodied energy.
Why is limiting of window areas important in keeping the heat loss low?
Based upon governmental recommendations, identify the recommended R-values for new house construction in the geographical location at which you reside.
Climates with high daily temperature swings (i.e., Arizona, New Mexico, and Colorado) benefit from the thermal mass effect for space heating while climates with low daily temperature swings
What is indoor air quality?
Describe the three categories of indoor air contaminants.
Describe the four types of biological contaminants.
Identify indoor air contaminants that are produced by combustion.
At what concentrations is carbon monoxide (CO) fatal?
What does the term sick building syndrome mean?
Radon levels in a building interior are recorded at 8 pCi/L. What are the U.S. Environmental Protection Agency recommendations for this level?
Identify problems related to building related illness.
Identify methods used to improve indoor air quality.
Describe two methods of controlling moisture in a building.
Describe the purpose of ventilating a building.
Describe the two basic types of ventilating a building.
Describe the three basic categories of moisture problems in buildings.
Identify and describe the four modes of moisture movement into and through building assemblies.
Describe water vapor permeability and permeance.
Define the properties of:a. Densityb. Specific heatc. Specific heat capacity
Distinguish between sensible heat and latent heat.
Describe psychrometrics.
Describe the psychrometric variables.
Describe the psychrometric processes.
Briefly describe the three natural processes by which body heat is transferred and how they affect comfort.

Showing 700 - 800 of 845