An Introduction to Physical Science
14th Edition
ISBN: 9781305079137
Author: James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher: Cengage Learning
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Chapter 19, Problem 24SA
To determine
The prevailing wind direction should be considered when designing the heating plan and insulation of a house or not.
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Assume that you are evaluating a building that has a heated slab-on-grade floor with edge insulation of R = 5.0 and a perimeter of 1000 ft. If your design temperature range is 5°F to -5°F, what is the heat loss, in BTU/hr, through the edge of the floor?
62,000 BTU/hr
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Someone claims that the air space in a double-pane window enhances the heat transfer from a house because of the natural convection currents that occur in the air space and recommends that the double-pane window be replaced by a single sheet of glass whose thickness is equal to the sum of the thicknesses of the two glasses of the double-pane window to save energy. Do you agree with this claim?
A 2 m2 window has a surface temperature of 15°C and the outside wind is blowing air at 2°C across it with a convection heat transfer coefficient of h = 125 W/m2K. What is the total heat transfer loss?
Chapter 19 Solutions
An Introduction to Physical Science
Ch. 19.1 - What are the four major gaseous constituents of...Ch. 19.1 - Prob. 2PQCh. 19.2 - Prob. 1PQCh. 19.2 - Prob. 2PQCh. 19.3 - Prob. 1PQCh. 19.3 - Prob. 2PQCh. 19.3 - Prob. 19.1CECh. 19.4 - Prob. 1PQCh. 19.4 - Prob. 2PQCh. 19.5 - Prob. 1PQ
Ch. 19.5 - Prob. 2PQCh. 19 - KEY TERMS 1. atmospheric science (Intro) 2....Ch. 19 - Prob. BMCh. 19 - Prob. CMCh. 19 - Prob. DMCh. 19 - Prob. EMCh. 19 - KEY TERMS 1. atmospheric science (Intro) 2....Ch. 19 - Prob. GMCh. 19 - Prob. HMCh. 19 - Prob. IMCh. 19 - Prob. JMCh. 19 - Prob. KMCh. 19 - Prob. LMCh. 19 - Prob. MMCh. 19 - Prob. NMCh. 19 - Prob. OMCh. 19 - Prob. PMCh. 19 - Prob. QMCh. 19 - KEY TERMS 1. atmospheric science (Intro) 2....Ch. 19 - Prob. SMCh. 19 - Prob. TMCh. 19 - Prob. UMCh. 19 - Prob. VMCh. 19 - Prob. WMCh. 19 - Prob. XMCh. 19 - Prob. YMCh. 19 - Prob. ZMCh. 19 - Prob. AAMCh. 19 - Prob. BBMCh. 19 - Prob. CCMCh. 19 - Prob. DDMCh. 19 - Prob. 1MCCh. 19 - Prob. 2MCCh. 19 - Photosynthesis is responsible for the atmospheric...Ch. 19 - What regulates the Earths average temperature?...Ch. 19 - Prob. 5MCCh. 19 - Prob. 6MCCh. 19 - Prob. 7MCCh. 19 - Prob. 8MCCh. 19 - Prob. 9MCCh. 19 - Prob. 10MCCh. 19 - What is the cloud root name that means heap?...Ch. 19 - Prob. 12MCCh. 19 - Prob. 1FIBCh. 19 - Prob. 2FIBCh. 19 - Prob. 3FIBCh. 19 - Prob. 4FIBCh. 19 - One standard atmosphere of pressure is ___ lb2....Ch. 19 - Prob. 6FIBCh. 19 - Prob. 7FIBCh. 19 - Prob. 8FIBCh. 19 - Prob. 9FIBCh. 19 - Prob. 10FIBCh. 19 - Prob. 11FIBCh. 19 - Prob. 12FIBCh. 19 - Prob. 1SACh. 19 - Prob. 2SACh. 19 - Prob. 3SACh. 19 - Prob. 4SACh. 19 - Prob. 5SACh. 19 - Prob. 6SACh. 19 - Prob. 7SACh. 19 - Prob. 8SACh. 19 - Prob. 9SACh. 19 - In terms of Rayleigh scattering, why is it...Ch. 19 - Prob. 11SACh. 19 - Prob. 12SACh. 19 - What are the four fundamental atmospheric...Ch. 19 - Prob. 14SACh. 19 - Prob. 15SACh. 19 - When is the relative humidity 100%? It may be...Ch. 19 - Which way, relative to the wind direction, does a...Ch. 19 - Prob. 18SACh. 19 - Prob. 19SACh. 19 - What is a convection cycle, and what are the...Ch. 19 - Prob. 21SACh. 19 - Why does weather generally move from west to east...Ch. 19 - Prob. 23SACh. 19 - Prob. 24SACh. 19 - Name the cloud family for each of the following:...Ch. 19 - Prob. 26SACh. 19 - Prob. 27SACh. 19 - Why are clouds generally white, while some are...Ch. 19 - Visualize the connections and give answers in the...Ch. 19 - (a) Why does the land lose heat more quickly at...Ch. 19 - Prob. 2AYKCh. 19 - Prob. 3AYKCh. 19 - Prob. 4AYKCh. 19 - Water leaks from a cup with a hole, as shown in ...Ch. 19 - Express the approximate thicknesses of the (a)...Ch. 19 - Prob. 2ECh. 19 - If the air temperature is 70F at sea level, then...Ch. 19 - If the air temperature is 20C at sea level, then...Ch. 19 - On a day when the air temperature is 85F, the...Ch. 19 - Prob. 6ECh. 19 - On a very hot day with an air temperature of 105F,...Ch. 19 - On a winter day, a psychrometer has a dry-bulb...Ch. 19 - The dry-bulb and wet-bulb thermometers of a...Ch. 19 - Prob. 10ECh. 19 - On a day when the air temperature is 70F, a fellow...Ch. 19 - On another day with the same air temperature...
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- A person is standing outdoors in the shade where the temperature is 24oC. (a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 150 cm2 and its emissivity is 0.82. (b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.69?arrow_forwardOne easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose the house already had 15.0 cm of fiberglass (glass wool) insulation in the attic and in all the exterior surfaces (including the floor of the attic room). If you added an extra 7.8100000000000005 cm of fiberglass to the attic ceiling, then by what percentage would the heating cost of the house drop? Take the room to be of dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors, and give your answer to one decimal place. Assume the same temperature difference between inside and outside the attic room, and that heat is lost through all six sides of the room. Hint: The cost of heating will be related to the amount of heat that is transferred through the walls, the floor and the ceiling of the attic. If let's say the heat loss is 1000 W in total (walls+floor+ceiling) without insulation, and then 800W in total with insulation, we are…arrow_forwardOne easy way to reduce heating (and cooling) costs is to add extra insulation in the attic of a house. Suppose the house already had 15 cm of fiberglass insulation in the attic and in all the exterior surfaces. If you added an extra 8.0 cm of fiberglass to the attic, then by what percentage would the heating cost of the house drop? Take the single story house to be of dimensions 10 m by 15 m by 3.0 m. Ignore air infiltration and heat loss through windows and doors.arrow_forward
- It is well known that wind makes the cold air feel much colder as a result of the wind chill effect that is due to the increase in the convection heat transfer coefficient with increasing air velocity. The wind chill effect is usually expressed in terms of the wind chill temperature (WCT), which is the apparent temperature felt by exposed skin. For outdoor air temperature of 0°C, for example, the wind chill temperature is 25°C at 20 km/h winds and -9°C at 60 km/h winds. That is, a person exposed to 0°C windy air at 20 km/h will feel as cold as a person exposed to -5°C calm air (air motion under 5 km/h). For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 170-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34°C. For a convection heat transfer coefficient of 15 W/m2·K, determine the rate of heat loss from this man by convection in still air at 20°C. What would your answer be if the…arrow_forwardConsider a person whose exposed surface area is 1.7 m2, emissivity is 0.5, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of 280 K.arrow_forwardA wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of 40.0 cm and a length of 55.0 cm, and operates at a temperature of 410°F. (o = 5.6696 x 108 w/m2. K, 1 Btu = 1054 J.) (a) If the temperature of the room is 70.0°F, determine the amount of radiant energy delivered to the room by the stove each second if the emissivity is 0.950. 2377.9 (b) If the room is a square with walls that are 8.00 ft high and 30.0 ft wide, determine the R-value needed in the walls and ceiling to maintain the inside temperature at 70.0°F if the outside temperature is 32.0°F. Note that we are ignoring any heat conveyed by the stove via convection and any energy lost through the walls (and windows!) via convection or radiation. 6.83 Your response differs from the correct answer by more than 10%. Double check your calculations. ft2 . °F · h/Btuarrow_forward
- At what temperature (in °C) does still air cause the same chill factor as 0°C air moving at 10 m/s?arrow_forwardA person is standing outdoors in the shade where the temperature is 21 °C. (a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 130 cm2 and its emissivity is 0.90. (b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.54?arrow_forwardIf 49% of the radiation that reaches the atmosphere is scattered or absorbed before reaching to the surface of the earth and the average albedo of the earth is 0.39. How much is radiation absorbed, reflected, emitted and net from the earth's surface, if it is known that the temperature Earth's average is 290 ° K and the emissivity is 0.95?arrow_forward
- An unused wood-burning stove has a constant temperature of 18 °C (291 K), which is also the temperature of the room in which the stove stands. The stove has an emissivity of 0.900 and a surface area of 3.50 m2. What is the net radiant power generated by the stove?arrow_forwardWater enters the tubes of a cold plate at 70°F with an average velocity of 40 ft/min and leaves at 105°F. The diameter of the tubes is 0.25 in. Assuming 15 percent of the heat generated is dissipated from the components to the surroundings by convection and radiation, and the remaining 85 percent is removed by the cooling water, determine the amount of heat generated by the electronic devices mounted on the cold plate.arrow_forwardA surface of area 0.5 m2, emissivity 0.8, and temperature 150°C is placed in a large, evacuated chamber whose walls are maintained at 25°C. What is the rate at which radiation is emitted by the surface?arrow_forward
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