In an ice-making plant, water (at a rate of 2500 kg/h) at 0°C is frozen at atmosphere pressure byevaporating R-134a. 333.7 kJ/kg of heat is removed from water per unit mass in order to freeze it intoice. The refrigerant enters as saturated liquid at -16°C, and leaves this evaporator as a saturated vapor.If we take the R-134a and its immediate surroundings as a system, determine the rate of entropygeneration during the evaporation process.Water at 0°CR-134a-16°CSat. liquid-16°CSat. vapor

Answered: In an ice-making plant, water (at a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Steam at a pressure of 11 bar and a temperature of 320C is containedin a large vessel. Connected to the vessel through a valve is a turbinefollowed by a small initially evacuated tank with a volume of 0.60 m3.When emergency power is required, the valve is opened and the tankfills with steam until the pressure is 11 bar. The temperature in the tankis then 400C. The filling process takes place adiabatically and kineticand potential energy effects are negligible. Determine the amount ofwork developed by the turbine in kJ.
At 5°F, the latent heat of vaporization (the heat needed to vaporize a liquid toa vapor) of R-124 is 70.7 Btu/lb. How many Btus of heat are needed tovaporize 18.6 pounds of R-124?
An adiabatic vessel has a valve that allows some water to be released. Initially it has 500 Kg of saturated liquid wate at a temperature of 50°C. Find the following: The temperature of remaining water if 10 Kg of water vapor escapes through the valve. If the remaining water is at 20°C, find the amount of water escaped as vapor. Assume specific heat of water, C = 4 Kj/Kg-K and Enthalpy of vaporization of water, AHvap 2400 Kj/Kg
elesi X3 5-83 Refrigerant-134a at 700 kPa, 70°C, and 8 kg/min is cooled by water in a condenser until it exists as a saturated liquid at the same pressure. The cooling water enters the condenser at 300 kPa and 15°C and leaves at 25°C at the same pressure. Determine the mass flow rate of the cooling water required to cool the refrigerant. Answer: 42.0 kg/min
A piston–cylinder device, initially containing 0.25-kg steam at 3.5 MPa, is superheated by 4°C, i.e., the saturation temperature is raised by 4°C. Afterwards, the steam loses heat to the surroundings such that the piston moves down, hitting the stops; the cylinder contains saturated liquid water at this point. Hint: what is the type of boundary work done here? Is the work done by or done on the system? The cooling continues until the cylinder contains water at 205°C. Determine (a) the final pressure, in kPa, (b) the qualityat the final state, (b) the boundary work from state 1 to state 2, in kJ, (c) the amount of heat transferred when the piston first hits the stops, in kJ, (d) and the total amount of heat transferred for the system, in kJ. Is this heat added to or removed from the system?
An electric windshield defroster is used to remove 0.25-in of ice from a windshield. The properties of the ice are Tsat = 328F, uif = hif = 144 Btu/lbm, and v = 0.01602 ft3/lbm. Determine the electrical energy required per square foot of windshield surface area to melt this ice and remove it as liquid water at 328F. What is the minimum temperature at which the defroster may be operated? Assume that no heat is transferred from the defroster or ice to the surroundings.
Steam enters the condenser of a steam power plant at 20 kPa as asaturated vapor with a mass flow rate of 20,000 kg/h. It is to be cooled by water from anearby river by circulating the water through the tubes within the condenser. To preventthermal pollution, the river water is not allowed to experience a temperature rise above10°C. If the steam is to leave the condenser as saturated liquid at 20 kPa, determine(a) the mass flow rate of the cooling water required, and(b) rate of heat loss from the steam.(c) show the process for the steam on a ?-v diagram
A partition divides an insulated tank into two parts which are not equal. One part of the tank contains 5 kg of compressed liquid water at 65°C and 600 kPa while the other part is evacuated (Hint: For compressed liquids, if tables are not available, use properties of the saturated liquid at the specified temperature). The partition is then removed, and the water expands to fill the entire tank. Determine the final temperature of the water and the volume of the tank for a final pressure of 20 kPa.
A 0.3-m3 rigid tank initially contains refrigerant- 134a at 14°C. At this state, 55 percent of the mass is in the vapor phase, and the rest is in the liquid phase. The tank is connected by a valve to a supply line where refrigerant at 1.4 MPa and 100°C flows steadily. Now the valve is opened slightly, and the refrigerant is allowed to enter the tank. When the pressure in the tank reaches 1 MPa, the entire refrigerant in the tank exists in the vapor phase only. At this point the valve is closed. Determine (a) the final temperature in the tank, (b) the mass of refrigerant that has entered the tank, and (c) the heat transfer between the system and the surroundings.
The water vapor that is at 3.00 MPa and 540°C goes through a pipe with a 0.40 m^2 cross sectional area and a 8.20 kg/s mass flow rate. What is the velocity that the vapor flows through the pipe in m/s?
Q: Five hundred kilograms per hour of steam drives a turbine. The steam enters the turbine at 44 atm and 450°C at a linear velocity of 60 m/s and leaves at a point 5 m below the turbine inlet at atmospheric pressure and a velocity of 360 m/s. The turbine delivers shaft work at a rate of 70 kW, and the heat loss from the turbine is estimated to be 10ʻ kcal/h. Calculate the specific enthalpy change associated with the process.

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