FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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PROBLEM 2.0 The working substance for a Carnot cycle is 9 Ib of air. The volume at the beginning of isothermal expansion
is 10 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the
cold body is 90°F. Find
The heat added BTU.
The heat rejected in BTU.
The mean effective pressure in psi
The ratio of expansion during the isentropic process
The overall ratio of compression.
3- Air enters the compressor of a gas turbine at 120 kPa, 310 K. The air
compressed to 1100 kPa, the turbine inlet temperature is 1460 K and the
expansion occurs in two stages, with reheat to 1420 K between the
stages at a pressure of 300 kPa. The compressor efficiency is 85 %. The
net power developed is 2.2 MW. sketch T -S diagram then Determine:
The thermal efficiency of the cycle.
Qin
Qin
The back work ratio.
Combustor
Reheat
combustor
Turbine
Turbine
stage 1
stage 2
cycle
Compressor
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- 3.5 An ammonia refrigeration system operates between saturated suction temperature of -20°C, and saturated discharge temperature of +40°C. Com- pare the COP of the cycle using wet compression with that of the cycle using dry compression. Assume that the vapour leaving the compressor is saturated in the case of wet compression, and the vapour entering the compressor is saturated in the case of dry compression. The refrigerant leaves the condenser as saturated liquid.arrow_forward8.35 Consider a Carnot-cycle heat engine with water as the working fluid. The heat transfer to the water occurs at 300°C, during which process the water changes from saturated liquid to saturated vapor. The heat is rejected from the water at 40°C. Show the cycle on a T-s diagram and find the quality of the water at the beginning and end of the heat re- jection process. Determine the net work output per kilogram water and the cycle thermal efficiency.arrow_forwardMay you please explain each steps. Thank youarrow_forward
- I need a solution within 15 minutesarrow_forward1. In a steam power plant steam enters the turbine at 6 bar and 400°C and is expanded isentropic ally to the condenser pressure of 0.1 bar. If the isentropic efficiency of the turbine is 80%, find the actual net work output and the thermal efficiency.arrow_forwardPLEASE SHOW COMPLETE SOLUTION (DRAW THE TS DIAGRAM)arrow_forward
- 1. In a Regenerative cycle, the steam is extracted from the turbine at 2 Mpa and 250C for feedwater heating and it is mixed with condenser exit at 30 kpa after pumping. Find the fraction of vapor extracted from the turbine.arrow_forwardProvide the complete solution and diagram for this problem. A reversed Carnot cycle operating in a heat pump has an evaporator temperature of -4oC andcondenser temperature of 50oC. Find the performance factor if it will operate in a heat pump. A. 4.45 B. 3.45 C. 6.21 D. 5.9arrow_forwardA reheat cycle with two stages of reheating is executed, with steam expanding initially from 90 bar and 530°C. The two reheater pressures are 10 bar and 0.6 bar, and the steam leaves each reheater at 480°C. Condensation occurs at 0.03 bar. For an ideal cycle, find the e in %.arrow_forward
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