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

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The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and the pressure is very nearly 1 atm throughout. The volumetric flow rate entering at state 2 is AV₂2 = 4400 ft3/min. Assume the ideal gas model for air with cp = 0.24 Btu/lb-ºR and ignore kinetic and potential energy effects. 1 (AV)1 = 5000 ft³/min T₁ = 80°F (AV)₂ T₂ = 40°F ft³/min Air, Cp=0.24 Btu/lb R p=1 atm -Insulation 3 V3=400 ft/min T3 = ? Determine the temperature of the air at the exit, in °F, and the rate of entropy production within the ducts, in Btu/min.°R.
| 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
Consider the steady-state counterflow heat exchanger shown below. There are separate streams of air and water, and each stream experiences no noticeable change in pressure. Stray heat transfer with the surroundings and changes in kinetic and potential energy can be ignored. For the air, the ideal gas model can be applied and Rair = 0.287- For the operating conditions provided on kg-K the figure, determine: a. The temperature of the air at the outlet of the heat exchanger, T4, in [K] b. The rate of heat transfer between the air and the water, in [kW; , c. The rate of entropy production for the heat exchanger, in [kW/K] kg msteam = 12 P1 = 3 bar X1 = 1 P2 = P1 T2 = 200 P3 = 1 bar T3 = 1100 K P4 = P3 T, =? mair kg = 3.29
53.1 64.4 68.6 489 523 atio of 3 (i.e 581 613 659 ge turbine ir is 10 bar reases its t which increa ssure ratio 18.7 21.4 24.4 30.2 37.9 44.5 = 0.287 kJ/k 683 711 744 773 808 er system as foll re of the air is 4 K. > first turbine ha e back up to 90 pic efficiency of !) in kW: 12 >erfectly isentropic (i.e. T') in K:
CO2 enters a compressor at 1 bar, 34 ° C, with a velocity of 28.4 m / s through a 150 mm diameter pipe located 7 m below the discharge line and exits at 8 bar and 265 ° C through a 120 mm diameter pipe. The heat losses are 4.5 kJ / kg. It is asked to calculate:Data: CP = 0.85 kJ / kg. °C Molar mass = 44 Local electricity tariff = S /. 0.2780 / kWh a) The velocity of the gas at the outlet, in m / sb) The mechanical power (shaft), if the compression efficiency is 78%, in kWc) If the compressor must deliver 15,000 m3 of compressed air per day, continuously, what consumption (kWh) and what monthly cost (S /.) Does this compressor originate, if the efficiency of its motor is 80%?
14.5 please answer asap
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.
Step by step solution for mass flow, volumetric flow, and velocity please thank youu
Chapter 6 9.
i. Develop a simple energy balance formulation for a steady state flow operation: (a) Pump, (b) Gas turbine, (c) Gas compressor, (d) Nozzle, (e) Throttle valve, (f) Heat Exchangers.
A system consisting of a gas contained in a cylinder with a frictionless piston is taken around the closed path a→b→c→a where the process c→a is isothermal. During the closed cycle, the system expels 150 J to the environment. If the work done on the system during the isobaric leg b→c of the cycle is 250 J, what is the heat expelled/absorbed by the gas in the isothermal leg c→a in J.

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