5. A 500 m dark-colored swimming pool is located in a well-sheltered site where the measured wind speed at 10m height is 3 m/s. The water temperature is 25 °C, the ambient air temperature is 17 °C, and relative humidity is 60%. There are no swimmers in the pool, the temperature of the make-up water is 22 °C, and the solar irradiation on a horizontal surface for the day is 20.2 MJ/m² day The amount of energy must the solar system

5. A 500 m dark-colored swimming pool is located in a well-sheltered site where the measured wind speed at 10m height is 3 m/s. The water temperature is 25 °C, the ambient air temperature is 17 °C, and relative humidity is 60%. There are no swimmers in the pool, the temperature of the make-up water is 22 °C, and the solar irradiation on a horizontal surface for the day is 20.2 MJ/m² day The amount of energy must the solar system

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.31P: A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The...

See similar textbooks

Similar questions

Using the equations for the Barometric Law and temperature decrease from adiabatic expansion (found in the lecture, calculate the atmospheric temperature at 5 km. Assume dry air, i.e. gamma equal to 1.4, temperature at the surface is 288 K. Group of answer choices These laws cannot predict the temperature at 5 km. 288 K 148 K 243 K
Consider a thin-walled, ﬁ xed-volume container of volume V that holds an ideal gas at constant temperature T. It can be shown by dimensional analysis that the number of particles striking the walls of the container per unit area per unit time is given by nv-/4, where as usual n is the particle number density. The container has a small hole of area A in its surface through which the gas can leak slowly. Assume that A is much less than the surface area of the container. (a) Assuming that the pressure inside the container is much greater than the outside pressure (so that no gas will leak from the outside back in), estimate the time it will take for the pressure inside to drop to half the initial value. Your answer should contain A, V, and the mean molecular speed v-. (b) Obtain a numerical result for a spherical container with a diameter of 40 cm containing air at 293 K, if there is a circular hole of diameter 1.0 mm in the surface.
A white flying saucer made of aluminum is in outer space, and the sun is shining on the top surface of it. It has a surface area of 1 m² per side. The absorptivity (a) for white paint is 0.3 to 0.5 for solar radiation (H&H Tbl. 4.1), so a good assumption would be to use the average of 0.4. The emissivity (ɛ) for white paint in the 0-38°C range is 0.9. Incoming solar radiation intensity in outer space is 1353 W/m² (p. 12 in H&H). You may assume that there is no conductive or convective heat loss from the plate, as it is almost a vacuum in outer space. Calculate the equilibrium temperature of the plate, based on the incoming solar radiation and the outgoing radiation from the plate back to outer space.
Explain the relationships between system constants for a perfect gas
Write a question about the amount heat carried away by convection after you have taken X= 14 breaths on a cold day. Feel free to look up reasonable estimates of temperature, the heat capacity of air, and lung capacity. Show work please and thank you in advance
ricant An oil is acting as a lubricant for a pair of cylindrical surfaces such as those shown in 1. The angular velocity of the outer cylinder is 7908 rpmt. The outer cylinder has a radius of 5.06 cm, and the clearance between the cylinders is 0.027 cm. What is the maxi- mum temperature in the oil if both wall temperatures are known to be 158° F? The physical properties of the oil are viscosity density thermal conductivity 92.3 cp 1.22 g cm-3 0.0055 cal sec-1 cm-1 ° C-1
..P15 A horizontal cylinder 10 cm in diameter contains helium gas at room temperature and atmospheric pressure. A piston keeps the gas inside a region of the cylinder 20 cm long. (a) If you quickly pull the piston outward a distance of 12 cm, what is the approximate temperature of the helium immediately afterward? What approximations did you make? (b) How much work did you do, including sign? (Note that you need to consider the outside air as well as the inside helium in calculating the amount of work you do.) (c) Immediately after the pull, what force must you exert on the piston to hold it in position (with the helium enclosed in a volume that is 20 + 12 = 32 cm long)? (d) You wait while the helium slowly returns to room temperature, maintaining the piston at its current location. After this wait, what force must you exert to hold the piston in position? (e) Next, you very slowly allow the piston to move back into the cylinder, stopping when the region of helium gas is 25 cm long.…
A Deep-sea Diver is wearing a wetsuit in cold water. (Natural convection, radiative transfer is negligible). The following data are given: Water Temperature Te= 10 Degrees Celsius. Wetsuit thickness is equivalent to a 8mm neoprene rubber (thermal conductivity is 0.19 W/m-K), Skin thickness is 1.45mm, Skin thermal conductivity is 0.21 W/m-k. Body temperature below skin Tb= 37 degrees Celsius. Average Air gap thickness is 1mm, air thermal conductivity = 0.027 w/m-K. a) Draw a complete equivalent thermal circuit and show all parameters. b) Calculate the flux of heat loss from the diver (in W/m^2 of body surface area) c) Calculate the temperature of the skin outer surface (Ts) d) Based on your calculations is the wetsuit adequate to keep the diver warm enough? Why?
A circular plate of diameter (2.20 m) is placed some how 1.5 meter above the room floor, if the Raleigh number can be approximated by Ra=7.653E7*D and temperature difference between surface and room air temperature is 73 C, air properties: k= 0.0372 W/m.K, Pr = 0.686.What is the initial rate of cooling by convection from the Upper surface ONLY (Watts)?
Calculate (dynamic viscocity, Prandtl number, and thermal conductivity) at * 25 C
Ans. 0.9 m Q2/A vertical cylinder having a length of 30 cm is maintained at 100-C and exposed to room air at 15-C. Calculate the minimum diameter the cylinder can have in order to behave as a vertical flat plate. Ans. 9.01 cm
Q4/The outside wall of a building 6 m high receives an average radiant heat flux from the sun of 1100 W/m². Assuming that 95 W/m² is conducted through the wall, estimate the outside wall temperature. Assume the atmospheric air on the outside of the building is at 20°C. Ans. 170°C