INTRO TO PHYSICAL SCIENCE W/MINDTAP
14th Edition
ISBN: 9781337077026
Author: Shipman
Publisher: CENGAGE L
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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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23,000 BTU/hr
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?
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?
Chapter 19 Solutions
INTRO TO PHYSICAL SCIENCE W/MINDTAP
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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- The temperature of the ocean off the coast of New Jersey ranges from about 3 °C in late winter to about 24 °C in late summer. If we assume that the ocean temperature is representative of a layer that is 25 m deep and the only exchange of energy is at the ocean surface, what is the average energy flux at ocean surface that would be required to account for this temperature change?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_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 300 K.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_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_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. (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. ft2. oF . h/Btuarrow_forward
- A 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_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
- Sea breezes occur along coastlines, and consist of cool air moving toward the shore from the ocean. However, this only occurs during the day, and is a stronger effect when the air temperature on the land is greatest and the air temperature above the water is coldest. At night, the breezes are reversed, moving from the land toward the ocean. Taking into consideration the specific heat capacities of water and sand (which is about the same as that of concrete), explain how sea breezes form during the day and change direction at night.arrow_forwardFor the human body, what is the rate of heat transfer by conduction through the body’s tissue with the following conditions: the tissue thickness is 3.00 cm, the change in temperature is 2.00ºC, and the skin area is 1.50m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)arrow_forwardDuring a cold winter day, wind at 55 km/h is blowing parallel to a 4-m-high and 10-m-long wall of a house. If the air outside is at 5°C and the surface temperature of the wall is 12°C, determine the rate of heat loss from that wall by convection. What would your answer be if the wind velocity was doubled?arrow_forward
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