FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Define the Mechanisms of exergy transfer.
Water vapor enters a compressor at 100 kPa pressure, 100°C temperature and 1.1 kg/s mass flow rate and exits at 500 kPa pressure and 500°C temperature. Since the heat transfer from the compressor's surface to the environment is 75 kW and the boundary temperature between the compressor and the environment is 100°C,a) Find the exergy of the fluid at the inlet of the compressor (kW).b) Find the exergy of the fluid at the compressor outlet (kW).c) Find the second law efficiency of the compressor.d) Find the exergy destroyed (Exergy extinction) (kW).Note: Changes in kinetic and potential energies will be neglected and T (K) = 273 + °C will be taken. The pressure of the environment is 100 kPa and the temperature is 25°C.
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- A heat exchanger enters a mass flow of 100 / b / s of water at 30psia and 100 ° F and exits at 200 ° F. The heat supplied to the water stream comes from a stream of hot air that enters at 1000R and 45psia and exits at 680R. Considering that the ambient temperature is 520R. Determine: Ans: a) The exergy variation of the water current. b) The exergy variation of the air stream. c) The total irreversibility of the heat exchange process d) The exergy efficiency of the heat exchangerarrow_forwardThermodynamicsarrow_forwardIf a throttling valve is connected to the outlet for one of these tanks, whereby air leaves this valve steadily at 305K with a pressure drop of 50bar, apply an exergy balance across the valve and calculate the exergy change (units: kJ/kg).arrow_forward
- Consider a heat transfer process of the steady form that occurs along a plain wall. While the inner room temperature was kept at 25 °C, the outdoor environment temperature was measured to be 2 °C. If the heat transfer at this plain wall in an hour is 3,528 kJ, determine the.total exergy destruction per unit time (the rate), which occurs during this heat transfer process, a) use the total entropy generation to find the rate of the total exergy destruction in the room (i.e.., use the entropy balance), b) use the exergy balance to find the rate of the total exergy destruction in the roomarrow_forwardA granite rock of mass 900 kg is situated on a hill at an elevation of 1000 m. On a sunny day its temperature rises to 95"C Use the SL system state Part A Determine the maximum useful work that can be extracted from the rock if the atmospheric temperature is 30"C Express your answer to three significant figures. * O a ? vec kJ Submit Request Answer Part B Compare the potential energy (PE) of the rock with its stored exergy () 16"C Günesli Express your answer to three significant figures.arrow_forward3.1 For discussion: (a) Is it possible for exergy to be negative? Discuss. (b) Consider an evacuated space with volume V as the system. Eval- uate its exergy and discuss. PH associated with (c) Is it possible for the specific physical exergy e' a stream of matter to be negative? Discuss.arrow_forward
- When 1 kg of coal is burned in the boiler, 10 m3 of exhaust gas is formed, the volume ratios of which are given below. With 220 C from the chimney If the exhaust gas released is reduced to 20 C, find the heat to be saved from each kg of coal according to the method you want? H20 4.55% ; 02 6.71%; CO2 11.83%; N2 76.9% and for all gases V=22.4 m3arrow_forwardEXPLAIN THE THE DECREASE OF EXERGY PRINCIPLE AND EXERGY DESTRUCTION.arrow_forwardApply exergy analysis and calculate the exergy of three pressurised tanks (units: MJ) at the fully charged state. Where relevant, assume constant specific heats for airarrow_forward
- If the specific exergy of a gas in a cylinder of an internal combustion engine modeled as air behaving like an ideal gas is 368.91 kJ / kg and the cylinder contains 2450 cm2 of gaseous combustion products. Åt what elevation in meters 3-kg mass does it have to be lifted from zero elevation with respect to the reference environment so that its exergy equals the exergy of the cylinder? Assume gravity as g = 9.81 m /s^2 NOTE: The density of dry air at a pressure of 7 bar and a temperature of 867 ° C is 2.1388 kg / m^3.arrow_forward1. A source of heat at 1000 K transfers 1000 kW of power to a power generation device, while producing 300 kW of useful work. Determine: a. The rate of exergy destruction in this process if the environment is at 300K. b. The second law efficiency of the system.arrow_forwardi need the answer quicklyarrow_forward
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