An air-conditioning system is to befilled from a rigid container that initiallycontains 43 kg of liquid R-134a at 48 °C. Thevalve connecting this container to the airconditioning system is now opened until themass in the container is 2.92 kg, at which timethe valve is closed. During this time, onlyliquid R-134a flows from the container.Presuming that the process is isothermalwhile the valve is open, determine the finalquality of the R-134a in the container and thetotal heat transfer. (25p) An air-conditioning system is to befilled from a rigid container that initially A-C Linecontains mi kg of liquid R-134a at T°C. Thevalve connecting this container to the air-conditioning system is now opened until themass in the container is m2 kg, at which timethe valve is closed. During this time, onlyliquid R-134a flows from the container.Presuming that the process is isothermalwhile the valve is open, determine the finalquality of the R-134a in the container and thetotal heat transfer.Liquid R-134amı kgT°C

Psychrometry is the branch of engineering in which where study of moist air takes place. A…

An air-conditioning system is to be filled from a rigid container that initially contains 43 kg of liquid R-134a at 48 °C. The valve connecting this container to the airconditioning system is now opened until the mass in the container is 2.92 kg, at which time the valve is closed. During this time, only liquid R-134a flows from the container. Presuming that the process is isothermal while the valve is open, determine the final quality of the R-134a in the container and the total heat transfer.

An air-conditioning system is to be filled from a rigid container that initially contains 43 kg of liquid R-134a at 48 °C. The valve connecting this container to the airconditioning system is now opened until the mass in the container is 2.92 kg, at which time the valve is closed. During this time, only liquid R-134a flows from the container. Presuming that the process is isothermal while the valve is open, determine the final quality of the R-134a in the container and the total heat transfer.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

See similar textbooks

Similar questions

A steady-flow, steady-state thermodynamic system receives 1.67 lb/sof a fluid at 4320 psfa and 200°F and discharges it from a point80-ft above the entrance section at 21600 psfa and 600°F. The fluidenters with velocity of 120 ft/s and leaves with a velocity of 40ft/s. During this process, there are supplied 400 Btu/min of heatfrom an external source, and the increase in enthalpy is 2.0 Btu/lb.Determine the work done in horsepower.
An adiabatic piston-cylinder device equipped with aspring maintains the pressure inside at 300 kPa, when thevolume is 0, and in 3 000 kPa, when the volume is 5 m ^ 3. Thedevice connects to a steam supply lineat 1,500 kPa and 200 ° C, and at the beginning the volume of the cylinder is 0.Determine the final temperature (and quality, if applicable) whenthe valve is opened and water vapor is allowed to enter from thesupply to the cylinder, until the pressure inside is equal tothe one on the line. Also determine the total workperformed during this adiabatic filling process.
A boiler takes in feed water at 70 °C and generates steam at a pressure of 10 bar and drynessfraction 0.92. The wet steam enters a superheater and emerges with the same pressure at atemperature of 400 °C. If the steam flow rate is 5 tonnes per hour, determine (i) the rate atwhich heat transfer takes place in the boiler and (ii) the rate at which heat transfer takes placein the superheater. State any assumptions you have made in relation to the steady flowequation for the process.
A single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturatedammonia vapor at -18°C and discharges it at 1514.3 kPa. The system is used to produceice at a final temperature of -10°C from water at 27°C. The compressor runs at 450 rpmwith an actual volumetric efficiency of 78%. Assume compression and mechanicalefficiencies to be 82% and 88%, respectively. Calculate the following: (a)capacity ofthe system in tons of refrigeration, (b) brake hp required by the compressor, (c) tons ofice produced per day if compressor runs only 20 hours a day. Assume losses to be 10%of the refrigeration required to produce the ice, and (d) ideal and actual COP.
A steady flow thermodynamic system receives 100lb/min of fluid at 30psia and 200 °F and discharges it from a point 80 ft above the entrance section at 150 psia and 600°F. The fluid enters with the velocity of 7200 fpm and leaves with the velocity of 2400 fpm. During this process, there are supplied 25,000 BTU/hr of heat from an external source, and the increase in enthalpy is 2.0 BTU/lb. Determine the Work done in horsepower.
A gas enters a turbine at an inlet state of 800 kPa. The gas expands and leaves the turbine atan outlet state of 100 kPa and 497 Celcius. The amount of heat transferred out from the turbine tothe surrounding is 10 kJ/kg. The surrounding is at a temperature of 28 Celcius. The actual workoutput from the turbine is 484 kJ/kg. Properties of the gas: R = 0.287 kJ/kg.K;cp = 1.138 kJ/kg.K; cv = 0.851 kJ/kg.K; k = 1.337; i) Write the energy balance equation for the turbine and state your assumptions.ii) Determine the temperature of the gas at the turbine inlet, K.iii) Determine the entropy generation, sgen during the expansion process, kJ/kg.K.iv) Is the expansion process possible? Briefly explain your answer.v) Determine the isentropic efficiency of the turbine, %.
Steam expands adiabatically in a nozzle from inlet conditions of 130(psia), 420(°F),and a velocity of 230(ft)(s)−1 to a discharge pressure of 35(psia) where its velocity is2000(ft)(s)−1. What is the state of the steam at the nozzle exit, and what is SG for theprocess?
A three-stage compressor receives 500 lps of air at 101 kPaa and 27degrees Celcius, anddischarges at 750 kPaa. Determine a) the power required; b) the pressure at eachintercooler; c) the maximum temperature; and d) the heat transferred in each intercooler. e) What is the discharge temperature of a single-stage compressor operating at the sameintake and discharge temperatures?
A process innovated by Engr. Santioque is considered to be in a constant pressure. If there is tenkilograms of air has a decrease of internal energy of 35 BTU while its Fahrenheit temperature is reduced to one half of the initial temperature during a reversible non flow process. Determine (a) the initial and final temperatures, (b) heat, (c) work, and (d) the change in entropy.
Draw the control volume of a compressor and apply the first law of thermodynamics to it.With suitable assumptions, derive the equation of the power (workdone per second) requiredby the compressor. please make it clear with space
. A 25 L tank, that is initially evacuated is connected by a valve to an air supply lineflowing air at 20◦C, 800 kPa. The valve is now opened, and air flows into the tank untilthe pressure reaches 600 kPa. Determine the final temperature and mass inside the tank,assuming the process is adiabatic. Develop an expression for the relation between theline temperature and the final temperature using constant specific heats.
Answer the other probem (NOT 1C5) use 1C5 as a reference 1.C.5. The refrigerant in an evaporator goes through phase change at a constant temperatureof −30◦C. The rate of vaporization of the refrigerant is 0.15 kg/s. The latent heat of vaporization ofthe refrigerant is 412.1 kJ/kg. Air enters the evaporator at mass flow rate 1.1 kg/s with a temperatureof 45◦C. Assume air has a constant specific heat of 1007 J/kg·K. What is the effectiveness of this heatexchanger? It was found that the convection coefficient of air in the evaporator described in Example 1C.5 is350 W/m2·K, and the heat transfer surface area is 5.1 m2. What is the average convection coefficientof the refrigerant under these conditions? (Note: As the refrigerant is evaporating, it is also flowingin the heat exchanger. And since it is a flowing fluid, it will have a convection coefficient.)