Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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The jet engines on a Boeing 757 must develop a certain
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One of the design requirements for a multi-role jet fighter is a maximum sustained load factor of 9 g’s at 15,000 ft above mean sea level (MSL). What atmospheric conditions (P, T, and ρ) would you use in calculations which determine if a proposed design can meet this requirement?
Calculate the height of chimney required in a boiler in which natural draught is 25 mm of water. The flue gases are at temperature of 600K , atmospheric air temperature is 25 C and 15 kg air per kg of fuel is required in boiler.
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- Example 03: A hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.650 m³ and the tension in the cord is 900 N. (a) Calculate the buoyant force exerted by the water on the sphere. (b) What is the mass of the sphere? (c) The cord breaks and the sphere rises to the surface. When the sphere comes to rest, what fraction of its volume will be submerged?arrow_forwardThe weight of a star is usually balanced by two forces: the gravitational force, acting inward, and the force created by nuclear reaction, acting outward. Over a long period of time, the force due to nuclear reactions gets weaker, causing the gravitational collapse of the star and crushing atoms out of existence. Under such extreme conditions, protons and electrons are squeezed to form neutrons, giving birth to a neutron star. Neutron stars are massively heavy - a teaspoon of the substance of a neutron star would weigh 100 million metric tons on the Earth. a) Consider a neutron star whose mass is twice the mass of the Sun and whose radius is 13.3 km. (The mass of the Sun is 1.99-1030 kg.) If it rotates with a period of 2.57 s, what is the speed of a point on the Equator of this star? Submit Answer Tries 0/99 b) What is the value of g at the surface of this star? Submit Answer Tries 0/99 c) Compare the weight of a 1.30-kg mass on the Earth with its weight on the neutron star. How many…arrow_forwardTask 2:An airplane with a NACA 662-215 airfoil cruises at 170 m/s at an altitude of 4550 m. The airfoil has an aspect ratio of 9 with a span of 30 m. Determine the lift and drag forces then determine the power required to overcome drag. Consider the airplane flying at an angle of attack equal to 2.arrow_forward
- 3. The friction coefficient on the surface of the sea is f = 0.21. What is the shear stress produced by a wind of 12 knots?arrow_forward3. Suppose that in the Magdeburg hemisphere demonstration we replace the hollow sphere with a hollow cube, with a volume of 1 cubic foot. The cube is bisected into two equal halves and the seams are sealed with grease. When the cube is evacuated, what is the maximum force (in lbs) needed to pull the cube apart (at sea level)? Does it matter how the cube is bisected?arrow_forwardThe Antonov An-225 is the heaviest aircraft ever built, with a maximum takeoff weight of 640 metric tonnes. It also has the largest wingspan of any aircraft in operational service. Sea level standard day (sls) conditions for calculations are 15°C; 101.3kPa Rotate speed (Vr) at takeoff (sls): Vr = 154 kts = 1.2×Vmin (1 kt = 0.514 m/s) Cruise Engine Thrust : a) Calculate the lift coefficient for a standard day takeoff b) Calculate the drag coefficient at cruis Fcruise = 0.85 Fmax Engine maximum thrust: Factual,max = Fsls,max×δ θ½ δ = Pactual/Pref; and θ = Tref/Tactualarrow_forward
- A horizontal-axis wind turbine with rotor 80m in diameter is 35% efficient in 18m/s wind at 0.977 atmospheric pressure and 25°C. a. Calculate the total amount of power the wind turbine would produce in those winds. b. Estimate the amount of power the turbine would produce if the altitude increased by 1500m and the temperature increased to 30°C. TABLE 6.1 Density of Dry Air at a Pressure of 1 Atmosphere Temperature Temperature Density Density Ratio (°C) (°F) (kg/m³) (KT) -15 ៦ ៩៩ ៨ ៩ t = w c! ម៉ត់ -10 5 15 5.0 14.0 23.0 32.0 41.0 50.0 59.0 68.0 77.0 86.0 95.0 104.0 1.368 1.342 1.317 1.293 1.269 1.247 1,225 1.204 1.184 1.165 1.146 1.127 1.12 1.10 1.07 1.05 1.04 1.02 1.30 0.98 0.97 0.95 0.94 0.92 "The density ratio Kr is the ratio of density at 7 to the density at the standard (boldfaced) 15°C. TABLE 6.2 Air Pressure at 15°C as a Function of Altitude Altitude (meters) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 Altitude (feet) 0 656 1312 1968 2625 3281 3937 4593 5249 5905 6562…arrow_forwardA child takes a helium balloon on a plane from Denver (with an air pressure of 0.83 atm) on a cool day when the temperature is 20.0oC to Boston (at sea level, with an air pressure of 1.0 atm) where the temperature is 5.0oC. Assume that no gas escapes from the balloon during the flight. What is the volume of the balloon in Boston, relative to its size in Denver? Group of answer choices The volume in Boston is 0.79 times the volume in Denver. The volume in Boston is 0.20 times the volume in Denver. The volume in Boston is 0.87 times the volume in Denver The volume in Boston is 1.3 times the volume in Denver. The volume in Boston is the same as the volume in Denver.arrow_forward2. How does an airfoil work?arrow_forward
- 8. A spherical balloon is 40 ft in diameter and surrounded by air at 60°F and 29.92 in Hg abs. (a) If the balloon is filled with hydrogen at a temperature of 70°F and atmospheric pressure, what total load can it lift? (b) If it contains helium instead of hydrogen, other conditions remaining the same, what load can it lift? (c) Helium is nearly twice as heavy as hydrogen. Does it have half the lifting force? R for hydrogen is 766.54 and for helium is 386.04 ft.lb/lb.°R. Ans. (a) 2381 lb; (b) 2209 lbarrow_forwardProblem 5.6arrow_forwardIf your lift to drag ratio is 15 for airline A flight and the airplane weighs 15,000-lb for L/Dmax, what’s the speed for L/Dmax at 22,500 lbs.?arrow_forward
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