7.80 Figure Pz.80 shows an insulated counterflow heat exchanger with carbon dioxide (CO2) and air flowing through theinner and outer channels, respectively. The figure provides data for operation at steady state. The heat exchanger is acomponent of an overall system operating in an arctic region where the average annual ambient temperature is 20°F. Heattransfer between the heat exchanger and its surroundings can be ignored, as can effects of motion and gravity. Evaluate forthe heat exchangera. the rate of exergy destruction, in Btu/sb. the exergetic efficiency given by Eq. Z27.Let To 20°F, po 1 atmInsulationMair=1 lb/sT3 500°R3P3=50 lbf/in.2T4=720°RP4=40 lbf/in.2 +AirCO2mco=2 lb/sT-1200 RP=18 lbf/in.2T2=1100°RP2= 14.7 lbf/in.2FIGURE P7.80

Convert ambient temperature from Fahrenheit to Rankine.

Answered: 7.80 Figure Pz.80 shows an insulated…

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

See similar textbooks

Similar questions

2.
Please answer all questions or leave for someone else to answer. A feedwater heater, operating in steady state, has 2 inlets and one outlet, at inlet 1 steam enters at a pressure of 5Mpa, a temperature of 275°C with a mass flow rate of 40kg/s. At input 2 it is liquid water at a pressure of 5Mpa at 40°C and through a surface of 25cm ^2, at output 3 there is a volumetric flow of 0.06m^3/sec. Determine: a) mass flow of input 2 and 3 b) speed at input 1 c) enthalpy at output 3 d) outlet temperature in 3 e) the quality value if any
True Or False
pls answer correctly thanks
| Part of a refrigeration system operates at steady state with Refrigerant 22 as shown in the figure below. There is no significant heat transfer to or from the heat exchanger, valve, and piping. Kinetic and potential energy effects are negligible. State 1 is a saturated liquid. What temperature is it, in °F? Describe the refrigerant at state 4 as one of the following: compressed liquid, saturated liquid, tyro-phase mixture, saturated vapor, or superheated vapor. Determine the required mass flow for the given operating conditions, in lb/min. Determine the rate of heat transfer between the evaporator and its surroundings, in b. Btu/min. Make sure to clearly state the direction of heat transfer. 1. T=10°F P= 15 Ibf in (AV), = 9.5 ft/min. Pi= 120 Ibf/in.? Heat exchanger Throttling valve Evaporator P 15 lbfin.2 X3 = 1.0 P2= 15 lbf/in.2
4.105 Separate streams of steam and air flow through the tur- bine and heat exchanger arrangement shown in Fig. P4.105. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. Determine (a) T3, in K, and (b) the power output of the second turbine, in kW. W = 10,000 kW Wr2= 1 Turbine Turbine P3= 10 bar T = ? T2= 400°C P2= 10 barl T=240°C P4 = 1 bar Steam www www in 1. T= 600°C P= 20 bar Ts= 1500 K 5 Pz=1.35 bar m = 1500 kg/min Heat exchanger VT.= 1200 K P6=1 bar Air in Fig 4.105
... Moving to another question will save this response. Question 7 Compressed air with a flowrate of 8 kg/min flows through a two-stage turbine and heat exchanger system as follows: • At the entrance to the system (point 1), the pressure of the air is 8 bar and the temperature of the air is 359 K. • From 1-2 the air passes through a heat exchanger which increases its temperature to 922 K. • From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. P₂/p₂=3). This first turbine has an isentropic efficiency of 65%. • From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 922 K. • From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgk, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and y= 1.4. Select the correct value for each of the following values: ₂) a. The heat transfer to the air in the first heat exchanger (i.e. ₁) i in kW: b.…
4.30 Refrigerant 134a enters a heat exchanger operating ai steady state as a superheated vapour at 10 bars. 60°C. where it is cooled and condensed to saturated liquid at 10 bars. The mass flow rate of the refrigerant is 10 kg/min. A separate stream of air enters the heat exchanger at 37°C with a mass flow rate of 80 kg/min. Ignoring heat transfer from the outside of the heat exchanger and neglecting kinetic and potential energy effects, determine the exit air temperature, in °C.
QH = 7 kW, Q, = 3 kW, W = 5 kW b. Q„ = 7 kW, Q, : c. Q„ = 7 kW, Q, а. = 7 kW, W = 0 kW с. = 4 kW, W = 3 kW d. Q = 7 kW, Q, = 0 kW, W = 7 kW For each of the cases in Problem 5.21, determine if a heat pump satisfies the first law (energy equation) and if it violates the second law.
Problem 22.2 A closed system undergoes a process during which there is heat transfer to the system at a constant rate of 5 kW, and the power out of the system varies with time according to (+2.5t +5.0 Wout={+2 0 2.0 h where t is in hours and Wout is in kW. (a) Sketch the system and label the energy flows. (b) Determine the time rate of change of system energy at t = 1.2 h and 2.4 h, in kW (c) Determine the change in system energy after 3 h, in kW.h and in kJ. Ans: b) 1.8 kW ≤ dE/dt@1.2 h ≤ 2.2 kW c) 5 kW.h ≤AE ≤ 6 kW.h
REFRIGERANT 134 a 3 Ask: HEAT EXCHANGER AIR N 2 AIR REFRIGERANT 134a 1 Bar 89,6 F (AV₁) = 1m³/s MASS FLOW RATE 2) HEAT TRANSFER RATE and 0 P₁ OF ^^ 3 P GIVEN : KINETIC ENERGY AND POTENTIAL ENERGY = O STEADY STATE 4 REFRIGERANT T₂ 71.6 F 2 134 a 2 = = 0.95 Bar REFRIGE RANT AIR. 1349 BETWEEN P3 = X 3= 5 Bar IN kg/s 0.2 41 P4= 5 Bar T4 = 68°F
5.7 In a continuous agitation heating tank, w=wi=200lb/min, Cp and density are constant, the volume of the heating tank V=1.63ft^3, the specific heat of the liquid is 0.32Btu/(lbF), and the density is 62.4lb/ft^3 am. The heat input Q from the heater is 1680 Btu/min, and the inflow temperature is maintained at 80F. (b) Find the response when the inlet temperature increases to 95F at any moment and the heat input decreases to 1400Btu/min at the same time.

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS