A mechanical refrigeration system shown below with R-1234yf is operating under such conditionsthat the evaporator pressure is 150 kPa and the liquid approaching the refrigerant control valve isat a temperature of 40 C. Assume state 1 is saturated vapor and state 3 is saturated liquid. If thesystem has a capacity of 15 kW, determine:a. the refrigerating effect per kilogram of refrigerant circulated [kJ/kg],b. the mass flow rate per refrigeration capacity [kg/s-kW],c. volume flow rate per refrigeration capacity [L/s-kW] at the compressor inlet,d. total mass flow rate [kg/s],e. compressor power [kW] if the isentropic efficiency is 0.8; (Note: If needed, use the closestisobar given in tables),f. COP,g. Condenser heat rejection [kW],h. Massflow [kg/s],i. Compressor discharge temperature [C] (Note: Use the closest isobar given in tables),j. Show the cycle on P-h state diagram, showing/labeling isothermal, isobaric, and isenthalpiclines with given values. Show the states with points and labels.

Note: As per policy we can solve the first three subparts. Please resubmit the remaining parts.

Answered: A mechanical refrigeration system shown…

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

Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? What is the enthalpy of stream 4? Hot Side 6 5 Condenser 2nd Stage Compressor Throttle Valve 7 Flash Chamber Vapor Phase Only 1st Stage Compressor 8 Throttle Valve Evaporator 1 2 Cold Side
QI: An R-134a refrigeration system produces 10 ton of refrigerating effect at the evaporating temperature -10°C and the condensing temperature of 40°C.The absolute pressure measured at the inlet and outlet of evaporator are 2.0 bar and 1.7 bar, respectively. Considering there are no superheat and sub cooling effects, calculate the following parameters with or without a drop of pressure in the evaporator: (i) Refrigerating effect (ii) Mass flow rate (iii) Power requirement in kW/TR (iv) COP
2. A creamery must cool 20,000 liters of milk received each day from initial temperature of 29 °C to afinal temperature of 2 °C in 5 hours. If refrigeration losses amount to 10 percent of the cooling load, what must be the capacity of the refrigerating machine? Note: Specific heat of milk is 3.9 kJ/kg-K and S.G. = 1.05
A steam condenser receives 10 kg per second of steam with an enthalpy of 2570 KJ/kg. Steam condenses into liquid and leaves with an enthalpy of 160 KJ/kg, if cooling water passes through the condenser with temperature increases from 13oC to 24oC. Calculate the cooling water flow rate in kg/sec. Show conversion of units pls
You are replacing an HVAC system in your building. The system is a steam system that consists of a boiler that feeds several air-handling units. The total heating load for the building is 3613 thousand Btuh. The building has 15 floors in total. What is the required total flow rate (in lb/hr) of the steam to satisfy the heating load?
2- The following data relate to a two-pass surface condenser: Steam condensed = 1540 kg/hr Temperature of cooling water when it enters the condenser = 15° C Temperature of cooling water when it leaves the condenser = 30 ° C Vacuum in the condenser = 675 mm of Hg Barometer reading = 750 mm of Hg Temperature of condensate = 32 ° C Quality of exhaust steam = 0.92 Water velocity in tubes = 2.6 m/s Outside diameter of tubes = 2.8 cm Thickness of tubes = 0.03 cm Heat Transfer coefficient = 3.35 kJ/h/cm Determine Area of the tube surface required а- b- No. of tubes c- Length of tubes
In a refrigeration cycle, the refrigerant gains heat in the evaporator and in thesuction line. In a certain refrigeration system, R-134a gains 67.8 Britishthermal units per pound (Btu/lb) in the evaporator. It then gains 2.5 Btu/lb inthe suction line. Find in Btu/lb the total heat gained by the R-134a.
2. In a 30-minute trial of an oil engine running at 1750 rpm, the engine consumes 27.3 kg of fuel with a calorific value of 42,300 kJ/kg at a brake torque of 1640 N-m. There are 880 kg of jacketed cooling water system in the engine entering at 17 deg C and leaves at 77 deg C. There are 310 kg of air entering the intake manifold. The temperature of air at the intake manifold is 19 deg C and the temperature at the exhaust manifold is 586 deg C. Assuming mean specific heat capacity of exhaust gas to be 1.25 kJ/kg-K, determine the following D) Exhaust loss in kJ/min E) Radiation and Unaccounted Losses in kJ/min
(Open system) Presto pan can make the cooking process faster than a regular pan because it can maintain high pressure and temperature during the cooking process. The pressure in the pan is controlled with a pressure regulator that keeps the pressure constant by releasing steam periodically to prevent pressure build-up. A presto pan with a volume of 6 L and operating at a pressure of 75 kPa. Initially the pot contained 1 kg of water. Heat goes into the pan at a rate of 500 W for 30 minutes of operation. Consider the atmospheric pressure 100 kPa, determine: а. Temperature during cooking. b. The amount of water left in the presto pan after finishing cooking
Q2// In a boiler trail of one hour duration the following observations were made: Steam generated -5250 kg. coal burnt = 695 kg, calorific value of coal = 30200 kJ/kg, dryness fraction of steam -0.94, pressure of the boiler= 15 bar, temperature of steam leaving the super heater-400C, temperature of feed water 80C. Calculate: (a) Thermal efficiency of the boiler without super heater. (b) Thermal efficiency of the boiler with super heater. Ans(58%:73%)
Determine the coefficients of performance of the refrigeration cycle.
| 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

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