Mechanical And Electrical Systems In Architecture Engineering And Construction 5th Edition Frank R Dagostino, Joseph B Wujek - Solutions

Describe the environmental factors that influence thermal comfort.
In what ways does the surrounding air temperature affect the amount of body heat given off?
What effect does humidity have on the comfort of a body?
What is meant by effective temperature in relation to comfort?
What is meant by operative temperature in relation to comfort?
A boiler used to heat a school building is rated at 8 000 000 Btu/hr. Determine its rating in:a. MBHb. MBHc. kW
A furnace used to heat a home is rated at 30 kW. Determine its rating in:a. Btu/hrb. MBH
Convert a temperature of 80°F to:a. °Cb. Rc. K
Convert a temperature of 22°C to:a. °Fb. Rc. K
Ten pounds of liquid water is at a temperature of 180°F at standard atmospheric conditions. Determine the energy required to convert this to water vapor (steam) at a temperature of 212°F.
Moist air at standard conditions is at a dry bulb temperature of 93°F and a wet bulb temperature of 59°F. Use the psychrometric chart to find:a. The relative humidityb. The dew point temperaturec. The humidity ratiod. The specific volumee. The enthalpy
Moist air at standard conditions is at a dry bulb temperature of 93°F and a wet bulb temperature of 70°F. Use the psychrometric chart to find:a. The relative humidityb. The dew point temperaturec. The specific volumed. The humidity ratioe. The enthalpy
Moist air at standard conditions is at a dry bulb temperature of 50°F and a relative humidity of 70%. It is sensibly heated (constant moisture) to 72°F. Use the psychrometric chart to determine the following properties of the air after it is heated:a. The relative humidityb. The dew point
The following table contains outdoor cooling design temperatures for various cities. Use a psychrometric chart to find the following:a. The dew point temperature at each city under these design temperaturesb. The relative humidity at each city under these design temperaturesc. The humidity ratio at
A sling psychrometer is used to measure conditions in an indoor space. The dry bulb temperature is 76°F and the wet bulb temperature is 58°F. Use this data and the psychrometric chart to determine the following properties of the indoor air:a. The relative humidityb. The dew point temperaturec.
Moist air at standard conditions is at a dry bulb temperature of 80°F and a relative humidity of 50%. It is sensibly cooled (constant moisture) to 72°F. Use the psychrometric chart to determine its saturation temperature. Draw a simple sketch showing this process on a psychrometric chart.
Moist air at standard conditions in an indoor building space has a dry bulb temperature of 72°F and relative humidity of 50%. At what dry bulb temperature will condensation begin to occur on wall and window surfaces?
A building owner is considering replacing single-glazed windows with double-glazed windows to improve efficiency.It will also eliminate condensation moisture problems during cold weather. Moist air at standard conditions in the indoor building space reaches a maximum dry bulb temperature of 72°F
Moist air at standard conditions is at a dry bulb temperature of 50°F and a relative humidity of 70%. It is sensibly heated (constant moisture) to 72°F. Use the psychrometric chart to determine the energy added to the air after it is heated:a. In Btu/lb of dry airb. In Btu/ft3 of dry air
Moist air at standard conditions is at a dry bulb temperature of 80°F and a relative humidity of 50%. It is sensibly cooled (constant moisture) to 72°F. Use the psychrometric chart to determine the energy removed from the air after it is cooled:a. In Btu/lb of dry airb. In Btu/ft3 of dry air
Draw a simple sketch showing the process outlined in the previous example on a psychrometric chart.
Draw a simple sketch showing the process outlined in the previous example on a psychrometric chart.
Moist air at standard conditions is at a dry bulb temperature of 93°F and a wet bulb temperature of 59°F. It is cooled in an evaporative (swamp) cooler by adding water along the wet bulb temperature line. Use the psychrometric chart to find:a. The temperature of the air at a relative humidity of
A 12 ft by 12 ft square room has one exterior wall with a surface temperature of 58°F and three interior wall surfaces with a temperature of 72°F.a. Approximate the mean radiant temperature sensation of a person standing in the center of the room.Neglect the effects of the floor and ceiling.b.
A 3 m by 5 m rectangular room has one 4-m exterior framed wall with a surface temperature of 16°C. The three interior wall surfaces are at a temperature of 22°C.a. Approximate the mean radiant temperature sensation of a person standing in the center of the room.Neglect the effects of the floor
A 12 ft by 12 ft square corner room has an exterior wall with a surface temperature of 58°F and a glass window surface covering one wall at a surface temperature of 48°F. The two interior wall surfaces are adjacent to one another and are at a temperature of 72°F.a. Approximate the mean radiant
A 3 m by 4 m rectangular corner room has one 4-m exterior framed wall with a surface temperature of 16°C, and one window glass surface covering on one 4-m wall that is at a surface temperature of 7°C. The two interior wall surfaces are adjacent to one another and are at a temperature of 22°C.a.
Conditions at a construction site are recorded as a wet bulb temperature (WBT) of 70°F, a black globe temperature (BGT) of 89°F, and a dry bulb temperature (DBT) of 94°F.a. Determine the wet bulb globe temperature (WBGT).b. Is this temperature deemed safe for working conditions if an immediate
Conditions at a construction site are recorded as a wet bulb temperature (WBT) of 18°C, a black globe temperature (BGT) of 32°C, and a dry bulb temperature (DBT) of 36°C.a. Determine the wet bulb globe temperature (WBGT).b. Is this temperature deemed safe for working conditions if an immediate
Describe the three fundamental modes of heat transfer.
Describe the difference between natural convection and forced convection.
With respect to radiation heat transfer, describe opaque and translucent surfaces.
With respect to radiation heat transfer, describe the terms absorptivity, reflectivity, and transmissivity.
With respect to radiation heat transfer, describe the term emissivity.
Identify and describe types of coatings and surfaces used on buildings that intentionally affect radiant heat transfer.
With respect to buildings, describe the terms heat loss and heating load.
With respect to buildings, identify and describe the factors that contribute to heat loss in a building.
Describe the difference between thermal conductivity (k) and thermal conductance (C).
Describe the relationships between R-, C-, k-, and U-values.
What is transmission heat loss, and where does it occur in a building?
What is a thermal bridge in a building envelope assembly, and how does it affect heat loss in a building?
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 (plastic film), and 1⁄2 in gypsum board. Determine the temperatures at the surfaces of each
Define building science.
Describe the purpose of a vapor diffusion retarder (VDR).

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