Consider an ideal vapor compression system using R-134a. Its condensing pressureis 185 psia (sat. temp. 120 F) and evaporating pressure is 33 psia (sat. temp. 20 F).Using the attached P-h state diagram, answer the questions below. (You may wantto have a ruler to help read the chart.)a) Show the ideal cycle. Label the states (1,2,3,4).b) Calculate the COP for this ideal cycle.c) Determine the refrigerating effect per refrigerant circulated [Btu/lbm],d) For ATsc = 10 F of subcooling, how much does it change the refrigeration effect[% change].e) Determine the COP for part d.f) Determine the increase in COP for ATsh = 1 F of superheat. To answer thisquestion, compare the cycle in part e that has 0 F superheat with a cycle that has20 F of superheat and calculate 4COP/ATsh-%3D

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Answered: Consider an ideal vapor compression…

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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One mol of an ideal gas is taken through The gas is subjected a three-step cyclic process. successively to an isothermal expansion at 600 K from 5 to 3 bar (path a to b), a constant-pressure cooling (b to c), and a constant-volume heating (c to a). All processes are reversible. Cy and Cp AH for each step and for the entire process. Draw the cycle on the PV diagram. Compile all results in a table, as follows: 21.686 J mol-K-1 =30 J mol-1K-1. Calculate Q, W, AU and %3D
Draw a schematic diagramof each problem with labels of states of a substance; For uniformity purposes, assign STATE 1 at the inlet of a high-pressure turbine. The states must be arranged in a chronological order; Plot each cycle in a t-s diagram with the states consistent to the states assignment in the schematic diagram; An ideal Rankine cycle with double reheat operates the boiler at 12MPa, the reheater at 5 MPa and 2.0 MPa, and the condenser at 0.01 MPa. The temperature at the boiler and reheater outlets are maintained at 400°C. a) Determine the total rate of heat transfer per unit mass in the reheaters, and b) the thermal efficiency of this cycle.
3. In a cycle, a 4kg ideal gas (MW=3g/mol and k=2.3) confined in a controlled mass system went through three processes. The gas was started at 20kPa and 310K in the first process, and it was isometrically increased by 30kPa. The gas was subjected to 40OK using a process defined by PV^3=C. It returns to its original state polytropically. Calculate the entropy change for each process.
At the start of the compression process in the reciprocating compressor of refrigeration plant the refrigerant is at 1.5 bar, dry saturated. At the end of the compression process, which is according to a reversible polytropic law pv-C., The pressure is 6.5 bar. Using the properties of refrigerant given as table, interpolating where necessary, calculate. • The change of specific entropy during the • The degree of superheat of refrigerant after compression. process.
Problem 4: An engine operating on an ideal Diesel cycle has a cylinder volume when the piston is at bottom-dead-center (BDC), V₁ 1 liter = 0.001 m³. The intake pressure and temperature are P₁ = 300 K. The engine cycle contains the following processes: 100 kPa and T₁ = Adiabatic compression to V₁/24. Constant pressure heating to V₁/14. =
Q1: Select at least five different thermodynamic cycles/processes and make the P-v and T-v phase change diagrams. Also briefly explain the working of each cycle/process.
Problem: Identify the Enthalpy of State 1 to 4 (h1, h2, h3 and h4)Note: Point 2 and 4 are saturated.Process 1-2 IsometricProcess 2-3 IsothermalProcess 3-4 IsometricProcess 4-1 Isothermalwhere: at point1; Entropy = 9 KJ/Kg-K and Pressure = 0.64 MPaat point3 X=0.2
Draw a schematic diagram of each problem with labels of states of a substance; Assign STATE 1 at the inlet of a high-pressure turbine. The states must be arranged in a chronological order; Plot each cycle in a t-s diagram with thestates consistent to the states assignment in the schematic diagram; A reheat-regenerative Rankine cycle receives steam at 8.0 MPa, 300 0C and exhaust at 0.01 MPa. Steam is extracted at 2.0 MPa for CFWH and the remainder for reheating. The reheated steam enters the 2nd stage turbine at 1.5MPa and expands to 1.0 MPa where more steam is extracted for OFWH. The remainder expands to the condenser pressure of 0.01MPa. Feedwater from low pressure regenerative heater leaves the CFWH at 207 0C and mixes with the feedwater. Determine the percentages of the extracted steam and the cycle thermal efficiency.
What is the ideal mass flow rate for a refrigeration and cryogenic plant for oxygen production? Show solution if necessary and reference.
Steam is bled from a turbine to supply 2 MW of process heat in a chemical plant at 200 °C, as shown in the schematic, so that state 4 is saturated Part A liquid water at 200 °C. At the turbine inlet, (state- 1) steam is at 5 MPa , 500 °C and at the turbine exit the pressure is 10 kPa. (Figure 1) Determine the quality of steam at the turbine exit. Express your answer to two significant figures. Πν ΑΣ φ vec Submit Request Answer Part B Determine the bleed pressure (assume no frictional losses). Express your answer to three significant figures. Πν ΑΣ φ vec ? MPа Submit Request Answer Part C Determine the bleed rate. Express your answer to three significant figures. ΑΣφ vec ? kg/s Submit Request Answer Figure 1 of 1 Turbine Part D output Determine the mass flow rate (m) at the turbine inlet if the power output is 2 MW Express your answer to three significant figures. Process heat ΑΣΦ vec ? kg/s
A reheater cycle with two stages of reheating is executed with steam expanding initially from 20.356 Mpa and 540 oC. The pressures of two reheaters are 3.2356 Mpa and 0.85356 Mpa, and the steam leaves each reheater at 540oC. Condensation occurs at 70oC. Calculate W, ec and ee.
(7-2 from textbook) Determine the specific compressor Enthalpy Entropy work input required to compress steam isentropically from 100kPa to 1 MPa assuming that steam exists as saturated vapour at the inlet. Sat. Set Sat Sat. Evap., hy 2257.9 267s.O 1.3028 6.0562 7.3589 liquid, vapor, iquid, Evap vapor, 417.51 kug kg kikg K mlkg P 100 MPa IS79.88 C 0.19437 2582.8 2777 1 6.5850 Sat. 200 0.20602 26223 2828.3 5.6956 250 0.23275 27104 2943.1 6.9265 300 0.25799 2793.7 30E16 7.1246 350 0.28250 2875 7 3158.2 7.3029 400 0.30661 2957.9 3254.5 7 4670 500 0.35411 3125.0 3479.1 7.7642 600 700 0.40111 3297 5 3698.5 B.0311 0.44783 3476.3 3924.1 8.2755 0.49438 36617 4156.1 8.5024 0.54083 3853.9 4354.8 8.7150 0.58721 4052.7 454C.0 8.9155 800 900 1000 1100 0.63354 4257.9 4391 4 9.1057 1200 0.57983 4459.0 5148.9 9.2866 1300 0.72610 4685.8 5411.9 9.4593

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