FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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TRUE OR FALSE
1. Heat flows from hot object to cold object and vice versa, as exhibited by heat pumps.2. It's impossible to have 100% efficient engines, however, it's possible to convert 100% of heat into useful work.3. Natural processes tend to be more ordered than disordered due to entropy.4. The efficiency e of a heat engine is defined as the ratio of the work W done by the engine to the high temperature heat input Qh.5. All heat engines give rise to thermal pollution.
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 exchanger
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- Steam enters the high-pressure turbine of an ideal reheat Rankine cycle at 10 MPa and 500°C. The low- pressure turbine inlet admits steam at 1 Mpa. Assume that the pump inlet is a saturated liquid at 10 kPa and that 80 MW of power is produced overall. QUESTION 1 Using the property tables for both the inlet and outlet of the pump, determine the enthalpy in kJ/kg of the pump outlet. Report your answer to two decimal places using rounding. QUESTION 2 Report the amount of heat added, in kJ/kg, in the boiler before the high-pressure turbine to one decimal place using rounding. QUESTION 3 Report the amount of work produced in the high- pressure turbine, in kJ/kg, to one decimal place using rounding.arrow_forwardPlease helparrow_forwardWater is the working fluid in a reheat-regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1100°F and expands to 500 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 lbf/in.² undergoes a throttling process to 120 lbf/in.² as it passes through a trap into the open feedwater heater. The feedwater leaves the closed feedwater heater at 1400 lbf/in.² and a temperature equal to the saturation temperature at 500 lbf/in.² The remaining steam is reheated to 1000°F before entering the second-stage turbine, where it expands to 120 lbf/in.² Some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.2 Saturated liquid exits the open feedwater heater at 120 lbf/in.² The remaining steam expands through the third-stage turbine to the condenser pressure of 2 lbf/in.²…arrow_forward
- Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in lb/h. (b) the rate of exergy input, in Btu/h, to the working fluid passing through the steam generator. (c) the magnitude of the exergy output, in Btu/h, of the net power output. (d) the magnitude of the exergy loss in the condenser, in Btu/h. (e) the exergy destroyed in the tubine, in Btu/h. (f) the exergy destroyed in the open feedwater heater, in Btu/h.arrow_forwardCan someone help me to solve the following question showing all work.arrow_forwardA reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 ℃ and 37 kJ from another heat source at 97 ℃. The heat rejected (in kJ) to the heat sink at 47 ℃ is. A. 36 B. 49 C. 64 D. 81arrow_forward
- Air enters the compressor of a gas turbine at a pressure of 100 kPa and a temperature of 300 K, where it is compressed to a temperature of 680 K. The pressure ratio of the cycle is 8. Before entering the turbine, there is a heat transfer of 950 kJ/kg to the air. Since the turbine's isentropic efficiency is 84 percent,a) Show the cycle in the T-s diagram.b) The ratio of the work required to operate the compressor to the work obtained from the turbine.c) Calculate the thermal efficiency.(Ignore the variation of specific heats for air with temperature)arrow_forward10. Carnot cycle thermal efficiency is increased by reducing lower(sink) temperature 11. A system with higher exergy has more capacity to do work than a system with lower exergy. 12. A diffuser has low pressure at inlet and high pressure at outlet 13. Carnot efficiency equation can also be used to find efficiency of conversion of electrical and/or magnetic energy to work. 14. Quality factor of 0.75 indicates supersaturated vapor 15. Law of conservation of Mass and energy applied to Nozzles and Diffusers indicates that under ideal conditions, the change in kinetic energy of the fluid results in a complimentary change in enthalpy of the fluidarrow_forwardDetermine the exergy, in Btu, of one pound mass of: a) saturated liquid Refrigerant 134a at -5°F b) saturated vapor Refrigerant 134a at 140°F c) Refrigerant 134a at 60°F, 20lbf/in.2 d) Refrigerant 134a at 60°F, 10lbf/in.2 In each case, consider a fixed mass at rest and zero elevation relative to an exergy refernce environment for which To=60°F, Po=15 lbf/in.2arrow_forward
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