7.25 As shown in Fig. P7.25, a 1-lb metal sphere initially at 2000°R is removed from an oven and quenched by immersing it in a closed tankcontaining 25 lb of water initially at 500°R. Each substance can be modeled as incompressible. An appropriate constant specific heat for thewater is c 1.0 Btu/lb °R, and an appropriate value for the metal is cm = 0.1 Btu/lb oR. Heat transfer from the tank contents can beneglected. Determine the exergy destruction, in Btu. Let To = 77°F.System boundaryMetal sphere:Tmi=2000°Rm=0.1 Btu/lb Rmm= 1 lbWater:Twj=500°R=1.0 Btu/lb Rm 25 lbFIGURE P7.25

Answered: Image /qna-images/answer/60219814-948f-40c6-b85d-c09dc2f96bcf.jpg

Answered: 7.25 As shown in Fig. P7.25, a 1-lb…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A food product containing 85% moisture content is being frozen. Estimate the specific heat of the product at -4 ° C when 62% of the water is frozen. The specific heat of the dry product is 2.5 kJ / (kg ° C). it is assumed that the specific heat of water at -10 ° C is the same as the specific heat of water at 0 ° C, and the specific heat of ice follows the function Cp es = 0.0062 Tfrozen + 2.0649. Cp of frozen product = kJ / kg ° C.
Carbon dioxide (CO₂) fills a closed, rigid tank fitted with a paddle wheel, initially at 80°F, 50 lb/in², and a volume of 1.6 ft³. The gas is stirred until its temperature is 500°F. During this process heat transfer from the gas to its surroundings occurs in an amount 2.6 Btu. Assume ideal gas behavior, but do not assume constant specific heats. Kinetic and potential energy effects can be ignored. Determine the mass of the carbon dioxide, in lb, and the work, in Btu.
1. solve step by step and show proper conversion and cancellation of units.
One kilogram of an ideal gas at 5.5 bar with an initial volume of 0.3 m expands to a final volume of 0.5 m in accordance with the equation 13 pV = C. Find the heat transfer during the process. Take R = 0.287 kJ/kg-K and C¸ = 0.713 kJ/kg-K.
Five kilograms of a two-phase liquid-vapor mixture of water initially at 300\deg C and x1 = 0.5 is heated from the initial state to a saturated vapor state while the volume remains constant. The process is brought about by heat transfer from a thermal reservoir at 380\deg C. The temperature of the water at the location where the heat transfer occurs is 380\deg C.Let To = 300 K, Po = 1 bar, and ignore the effects of motion and gravity.
A 300-lb iron casting, initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb. °R, and 0.45 Btu/lb. °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. T₁ = i (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. J = °F Mi Btu/ºR
A closed system contains 1.2 kg of fluid, initially at 1.3 bar with a specific volume of 0.8 m3/kg. It undergoes a simple cycle as follows: 1-2 Constant volume heat addition of 26 kJ to 2.9 bar 2-3 Adiabatic expansion back to original pressure (k=1.4) • 3-1 Constant pressure process back to original conditions. Find for each process: • Work done Heat transfer Change of internal energy
A 300-lb iron casting. initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb - °R. and 0.45 Btu/lb - °R, respectively. (a) For the iron casting and oil as the system.determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. °F (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. Btu/°R
An oil pump operating at steady state delivers oil at a rate of 11 lb/s through a 1-in.-diameter exit pipe. The oil, which can be modeled as incompressible, has a density of 70 Ib/ft³ and experiences a pressure rise from inlet to exit of 40 Ibf/in?. There is no significant elevation difference between inlet and exit, and the inlet kinetic energy is negligible. Heat transfer between the pump and its surroundings is negligible, and there is no significant change in temperature as the oil passes through the pump. Determine the velocity of the oil at the exit of the pump, in ft/s, and the power required for the pump, in hp.
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