FUND OF THERMODYNAMICS- UND CUSTOM
2nd Edition
ISBN: 9781119694205
Author: Borgnakke
Publisher: WILEY C
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Chapter 5, Problem 5.104EP
Air in a piston/ cylinder goes through a Carnot cycle with the P−v diagram shown in Fig. 5.21. The high and low temperatures are 1200R and 600R, respectively. The heat added at the high temperature is 100 Btu/lbm, and the lowest pressure in the cycle is
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A cycle works with one kg of air and is compressed through a polytropic process (pv12 = C)
from state-1 at 120 kPa, 350K to state-2 of 600kPa, following a constant pressure cooling
process to state-3, then constant temperature heating from state-3 to state-1. Represent the cycle
on P-V diagram, find the temperature, pressure and volume at the end of each process of the
cycle, and find also the net heat and work done.
16.
A perfect gas has a valuen of R = 58.8 ft-lb/lb-R and k = 1.26. IF 20
%3D
BTU are added to 5 lb of this gas at constant volume when the initial
temperature is 90°F, find the final temperature, change in enthalpy,
change in entropy, change in internal energy, and work non flow.
As shown in the figure, a 260-ft tank contains 25 lb of H20 initially at 30 lbf/in?. The tank is connected to a large steam line carrying
steam at 200 lbf/in?, 450°F. Steam flows into the tank through a valve until the tank pressure reaches p2 = 160 lbf/in? and the
temperature is 400°F, at which time the valve is closed.
Steam at
Tank
200 lbf/in.2.
Valve
(1)
Initially:
30 lbfin.?, mı = 25 lb
(2)
Finally:
P, lbfin.?, 400°F.
450°F
(1)
Determine the amount of mass that enters the tank, in Ib, and the heat transfer to the tank from its surroundings, in Btu.
Chapter 5 Solutions
FUND OF THERMODYNAMICS- UND CUSTOM
Ch. 5 - Prob. 5.1PCh. 5 - A windowmounted air conditioner removes 3.5kJ from...Ch. 5 - R410A enters the evaporator (the cold beat...Ch. 5 - A large heat pump should upgrade 4MW of heat at...Ch. 5 - A car engine 5g/s fuel (equivalent to addition of...Ch. 5 - Prob. 5.37PCh. 5 - R134a fills a 0.1m3 capsule at 20°C, 200kPa. It is...Ch. 5 - Air in a piston/ cylinder goes through a Carnot...Ch. 5 - A heat engine receives 7kW from a 300°C source and...Ch. 5 - Consider the previous problem and assume the...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Q2: A piston-cylinder system contains 1 kg of air at (V1, P1, T1). The air is heated at constant pressure process until the volume is doubled. Then the air is compressed according to the low (PV=C) until the piston regains its original position. Then the air is cooled at constant volume processes until the pressure reach to the original value. Assume (V1, P1), Draw the cycle on p-v diagram and calculate 1- Net work done 2- Net heatarrow_forwardAir as ideal gas in the closed system, find the change of entropy from the initial to the final state, in Btu/lb oR ( degree R ). T1 = 360 oF (degree F), P1 = 14.7 psia T2 = 540 oF (degree F), P2 = 58.8 psiaarrow_forwardThermodynamics There is a rigid tank initially with water in a critical state, which after a heat transfer process reaches a pressure of 1 psia. The surrounding temperature is 1540°F. Find the total entropy change. Please draw a scheme.arrow_forward
- 1. A closed tank, V = 10 L, containing 5 kg of water initially at 25 °C, is heated to 150 ° C by a heat pump that is receiving heat from the surroundings at 25 ° C. Assume that this process is reversible. Find the heat transfer to the water and its change in entropy.arrow_forwardA cycle starts with an adiabatic compression of the air from state a with a volume V3 to state b with volume V1. At the end of the compression, heat is added (absorbed), resulting in an isobaric expansion to state c with volume V2 followed by an adiabatic expansion back to volume V3 at state d. Finally, heat is expelled, corresponding to an isochoric reduction completing the cycle and bringing air back to state a. Find the ratio between the initial and final temperatures for (1) the adiabatic compression, and (2) the adiabatic expansion in terms of the expansion ratio re = V3 /V2 and the compression ratio rc = V3 /V1..arrow_forwardPlease refer to the photo below. THANK YOU!arrow_forward
- Question 3 (5 Marks) A cycle works with one kg of air and is compressed through a polytropic process (pyl2 = C) from state-1 at 120 kPa, 350K to state-2 of 600KPa, following a constant pressure cooling process to state-3, then constant temperature heating from state-3 to state-1. Represent the cycle on P-V diagram, find the temperature, pressure and volume at the end of each process of the cycle, and find also the net heat and work done, Good Luckarrow_forwardFind the following: a.Steam temperature in degree celsius b.entropy of steam at the turbine in exit in kJ/kg c. Entropy of saturated liquid at condenser temperature in kJ/kg d. Sfg in kJ/kgK at condenser temperature. e.hf at condenser temperature f. hfg at the condenser temperature g. Specific volume of the condensate h. Quality of the steam at the turbine exitarrow_forwardAs shown in the figure, a 300-ft3 tank contains 25 Ib of H20 initially at 30 lbf/in?. The tank is connected to a large steam line carrying steam at 200 lbf/in?, 450°F. Steam flows into the tank through a valve until the tank pressure reaches p2 = 140 lbf/in? and the temperature is 400°F, at which time the valve is closed. Steam at Tank 200 lbf/in.2. 450°F Valve |(1) Initially: 30 lbf in.?, mı = 25 lb |(2) Finally: P, lbfin.?, 400°F. Determine the amount of mass that enters the tank, in Ib, and the heat transfer to the tank from its surroundings, in Btu.arrow_forward
- 2.A piston cylinder arrangement contains steam at 10MPaa saturated liquid. Heat was transferred isothermally so that the pressure reaches 2MPaa. а. Find the final temperature of the steam. b. Find the change of entropy in kJ/kg if there is no entropy production.arrow_forward2. A two-stage air compressor has an intercooler between the two stages as shown below. The inlet state is 100 kPa, 290 K, and the final exit pressure is 1.6 MPa. Assume that the constant pressure intercooler cools the air to the inlet temperature, T= T1. It can be shown that the optimal pressure, P,= (P.Pa for minimum total compressor work. Find the specific compressor works, the intercooler heat transfer for the optimal P, and sketch and label the P-v and T-s diagrams. otf Corpressor Compressor Intercoolerarrow_forwardConsider a turbine operating at steady-state with the operating conditions shown in the figure. Superheated water vapor enters the turbine with a mass flow rate of m = 5 and superheated water vapor exits at p2 and T2. Ignoring stray heat transfer and kinetic and potential effects: a. Calculate the net power of the turbine, Wr, in kW b. Calculate the entropy produced in kW/K All state properties needed to solve are provided below: State T (°C) p (bar) h (kJ/kg) s (kJ/kg-K) (1 1 240 10 2920.4 6.8817 Wr 2 160 3 2782.3 7.1276 P1 = 10 bar T = 240 °C = 3 bar (2) P2 T2 = 160 °Carrow_forward
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