QH rejected into the outdoorCondenserExpansionExit: 1.2 MPa70°CvalveCompressor-WinInlet: 400 kPaEvaporatorsat. vap.QL removed from the rooom The computer, TV, lights and all the appliances inside a room generate heat 5 kW. In order to keepthe room at 23°C, an air-conditioner is used to remove the waste heat from all the appliances to theMEC 301 Thermodynamics, Fall 2024outdoor air at 37°C. Inside the air-conditioner, the refrigerant R-134a enters the compressor at 400kPa as a saturated vapor at a volume rate of 0.002 m³/s and leaves at 1.2 MPa and 70°C. Determine(a) The actual COP, (b) the maximum COP and (c) the minimum volume flow rate of therefrigerant at the compressor inlet.

Given: Assuming, Standard Vapour Compression CycleI hope this is helpful.

Answered: QH rejected into the outdoor Condenser…

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

Find the mass of water, in kg, that can be cooled from 24 0C to -80C from a 10 tons refrigeration system for 15 hrs. ANSWER: 4197.930 kg A refrigeration system is used to cool water in the evaporator at 3 kg/s of water from 22 oC to ice. Find the tons of refrigeration required. ANSWER: 364.48805 TR A two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at -30 0C and the high pressure condenser is at 300C. The cascade condenser is a direct contact type. The refrigeration load is 24 tons. Given that, h2 = 393 kJ/kg; h6 = 408 kJ/kg. Find the mass flow rate in the low pressure loop. ANSWER: 0.4771 kg/s
3) The cold water system in a house is equipped with a pump. 12 kg of water at 5000kPa and 2°C will enter the pump until the pressure rises 3 times and the temperature is 12°C with 3kJ of heat loss. Hot water will be heated in a heat exchanger before entering the mixing chamber. The heat exchanger uses air at 150°C to heat 3kg of 5°C of 5MPA water until 120°C. The temperature of the air will be dropped 10 times than before. Later, the cold water will enter the mixing chamber to be mixed with hot water until the pressure of the water becomes 10MPA. Evaluate : a) work of the pump b) isentropic efficiency of the pump c) mass of the air used to heat the water d) heat add in the hot water e) temperature of the water at the exit of the mixing chamber in °C.
In a refrigerant-cooling system, 1.5 kg/s of refrigerant 134a flows at steady state through a coil having an inside diameter of 0.05 m. The refrigerant enters the tube as superheated vapor at 700 kPa and 70°C and leaves at 32°C and 690 kPa. You want to heat the water from of 25°C to 35°C by placing the coil inside a box and having the water enter and leave the box at a constant mass flow rate. Please answer the following: Please answer the following. a. Create a schematic that accurately describes the situation given in the problem. Include your chosen boundary and the energy interactions present across the boundary. You will select from which side the cold water enters the box; that is, closer to the inlet of the refrigerant at 70°C or closer to the exit of the refrigerant at 32°C. b. Represent the process for the refrigerant on a T-v diagram. Show the isobars corresponding to each state with their value. Include values on the axes using customary units. c. For this part you are going…
53.4 lbm of air in a rigid container at 22 psia and 400 R absorbs 3.04127 kW*hr of energy from an electrical resistance heater. For this problem, account for variable specific heats, but do not interpolate. a) Assuming no heat transfer, determine: The final temperature: The final pressure: R psia b) if the final pressure were 51.700 psia, determine: The final temperature: The heat transferred: R Btu
In a refrigeration plant there is a 10-Liter rigid tank that contains R-410A at -10°C, 80% quality. Electric work in the amount of 36 kJ is added to the R-410A, after which the R-410A temperature reaches 40°C. Calculate the heat transfer and determine if the heat transfer is to or from the tank during this process? Qualitatively draw the process in a p-v diagram.
In a commercial water heater, 80 L/min of water is heated from 20° C to 60° C . Calculate the amount of energy required per hour.
1. Steam enters a nozzle at 400°C and 800 kPa with a velocity of 10 m/s, and leaves at 300°C and 200 kPa while losing heat at a rate of 25 kW. For an inlet area of 800 cm?, determine the velocity and the volume flow rate of the steam at the nozzle exit. Determine the following: a. Velocity at the exit (m/s) b. Volume flow rate (m³/s) From steam table: h,=3267.7 kJ/kg h,=3072.1 kJ/kg 400°C 300°C 800 kPa Steam v,=0.39429 m /kg 200 kPa v,=1.3163 m /kg 10 m/s
Thermodynamics Question: Refrigerant – 134a is to be cooled by water in a condenser. The refrigerant enters the insulated condenser with a mass flow rate of 6 kg/min at 1 MPa, 70 oC and leaves at 35 oC. The cooling water (compressed liquid) enters at 300 kPa and 15 oC and leaves at 25 oC. Neglecting any pressure drops, kinetic and potential energy changes in the pipes, determine (a) the mass flow rate of the cooling water required and (b) the heat transfer rate from the refrigerant to water.
Refrigerant 134a enters the compressor of a refrigerator as superheated vapor at 0.20 MPa and -5 ° C at a rate of 0.7 kg / s, and exits at 1.2 MPa and 70 ° C. The refrigerant is cooled in the condenser to 44 ° C and 1.15 ° C. MPa, and throttles at 0.2 MPa. Neglecting any heat transfer and any pressure drop in the connecting lines between the components, show the cycle on a Ts diagram with respect to the saturation lines, and determine (a) the rate of heat removal from the refrigerated space and the inlet power to the compressor, b) the isentropic efficiency of the compressor, c) the COP of the refrigerator, d) show the Ts and Ph diagrams with all points
Problem. A reversible heat engine operates between high and low temperature reservoirs at TH and T1, respectively, and the heat QH is transferred from the high temperature reservoir to the heat engine. a) Write the expression of work W produced by the heat engine using TH, TL, and Он. Now, consider a rigid tank that contains 4 kmol of ideal gas at 500K and 4MPA. A reversible heat engine operates by using this rigid tank as high temperature reservoir and another low temperature reservoir at 320 K. The reversible heat engine stop working when the temperature of 3 rigid tank becomes 320 K. Assuming C, R, b) determine the total amount of work the heat 2 engine produced. (Hint: for ideal gas, du = C,dT. And use the 1st law to relate the heat transfer and the change of internal energy of the rigid tank). Rigid Reversible Low temperature Tank heat engine Reservoir Ideal gas QH QL 4 kmol 320K 500 K 4 MPa W
Let's assume that we generate electrical energy through a turbine generator. A reversible adiabaticBefore entering the turbine, it must be raised to a pressure of 10000 kPa and a temperature of 450 ºC. From the steam turbinepressure drops up to 150 kPa and a temperature of 100 C while exiting. The flow rate of steam in the turbine is 39 kg / s. ThisMeanwhile, your ambient temperature is measured as 25 ºC and pressure as 100 kPa. Considering these conditions, steamhow much exergy does it have when entering and exiting?, how much power does the turbine generate ?, how much more than this turbinepower can be generated and what is the second-law efficiency of this turbine? Calculate.
Refrigerant 134a enters a refrigerator compressor as superheated vapor at 0.20 MPa and -5 ° C at a rate of 0.7 kg / s, and exits at 1.2 MPa and 70 ° C. The refrigerant is cooled in the condenser to 44 ° C and 1.15 MPa, and is throttled to 0.2 MPa. Neglecting any heat transfer and any pressure drop in the connecting lines between the components, show the cycle on a Ts and Ph diagram with respect to the saturation lines, and determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, b) the isentropic efficiency of the compressor, and c) the COP of the refrigerator

SEE MORE QUESTIONS

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