Q1:- A refrigeration unit using R-134a as a refrigerant operating with twoevaporators at -4 °C and -20 °C and have the cooling loads of 20 TR and 40 TR,respectively. The unit employs compound compression with flash intercooling atthe evaporator pressure operating at higher temperature. The condensertemperature is 40 °C. It is assumed that the vapour leaving the evaporator is in drysaturated condition. Draw the cycle on a p-h diagram, and determine the following:(a) the mass flow rate of refrigerant in each evaporator. (b) the power requiredby the compressors in kW. (c) the coefficient of performance.

Given data, The evaporator temperature of 1st unit, T2 = -4 °C The evaporator temperature of 2nd…

Answered: Q1:- A refrigeration unit using R-134a…

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

9. A vapour compression plant is powered by a 2kW motor and circulates R12 at 5kg/min. The R12 leaves the condenser at its saturation temperature with a specific enthalpy of 74.59kJ/kg and leaves the evaporated dry saturated with a specific enthalpy of 187.53kJ/kg. Calculate: (a). the dryness fraction at the evaporator inlet (b). refrigeration effect (c). coefficient of performance
A. Describe the four processes, which occur in the vapor-compression-refrigeration cycle that youtested.B. How did you figure out the enthalpy at the various entry / exit stages? (I know you lookedat the chart or table provided! I understand that you may have used interpolation.) I want you toexplain briefly how you determined, what principle(s) you used to determine the enthalpy at thevarious points.Sketch a p-h diagram. On this sketch of the p-h diagram you must sketch and show SOME constanttemperature lines, constant pressure lines, constant enthalpy lines, constant entropy lines, quality factorand other significant features of the p-h diagram to show your understanding of the p-h diagram. Labelx & y axis, indicate the units, indicate the critical point. Label various regions,
An NH; vapor compression refrigeration system has a condensing temperature of 25°C and an evaporating temperature of -10°C. The refrigerating capacity is 7 tons. If the suction vapor was superheated from -10°C to 10 C, Determine: a) refrigerant flow rate; b) Volumetric flow at compressor suction; c) theoretical power required; d) Heat rejected in the condenser; e) Refrigerating Effect; f) COP
please include Ps and Th diagram
8.
4. A refrigerating plant having R-12 as the working fluid, comprises three evaporators of 10 TR at -10°C, 20 TR at 5°C and 30 TR at 10°C. Each of the evaporators is having the individual expansion valve arrangement. The refrigerant from the higher stage expansion valve is bled and mixed with delivery from the lower stage compressor and sent to the higher stage compressor suction thus effecting intercooling of the delivery gas from the lower stage and bringing the suction of the higher stage compressor to dry and saturated conditions. There is only one condenser operating at 40°C and sub- cooling the liquid refrigerant to 30°C. The compression during each stage of compression may be assumed isentropic. The evaporator discharge is dry saturated in cach of the evaporators. Determine the power required by the entire system. 5. A refrigeration system using R-12 as refrigerant consists of three evaporators of capacities 20 TR at - 5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the…
The food storage room requires a cooling system with a capacity of 10 tons of refrigeration that operates at an evaporator temperature of -17.8 ° C and a condenser temperature of 33.9 ° C. The refrigerant used is R-717 and the system operates in saturated conditions. questions a. COP = Answer. b. Refrigerant flow rate = Answer kg / s. c. Heat loss rate in condenser = Answer kJ / s
A single-effect falling-film evaporator is used to concentrate orange juice from 14% to 45% solids. The evaporator utilizes a mechanical refrigeration cycle using ammonia as a refrigerant for heating and for condensing the vapors. The refrige-ration cycle is operated at a high-side pressure of 200 psia (1.379 MPa) and a low-side pressure of 50 psia (344.7 kPa). The evaporator is operated at a vapor temperature of 90oF (32.2oC). Feed enters at 70oF (21.1oC). The ratio of insoluble to soluble solids in the juice is 0.09, and the soluble solids consist of glucose and sucrose in 70:30 ratio. Consider the ΔT as the log mean ΔT between the liquid refrigerant temperature and the feed temperature at one point and the hot refri-gerant gas temperature and the concentrated liquid boiling temperature at the other point. The evaporator has a heat transfer surface area of 100 ft2 (9.29 m2), and an overall heat transfer coefficient of 300 BTU (h.ft2.oF) or 1073 W/(m2.K) may be expected. Calculate:…
Working fluid is Refrigerant 134a. Vapor-compression refrigeration system has refrigerating capacity = 1650 Btu/hour. Refrigerant enters evaporator at -10F and leaves at 15F. Isentropic compressor efficiency = 74%. Refrigerant condenses at 140F and leaves condenser subcooled at 100F. No large pressure drops through evaporator and condenser. DETERMINE: 1. Pressure of evaporator in lbf/in^2 2. Pressure of condenser in lbf/in^2 3. Mass flow rate in lb/s of refrigerant 134a. 4. Power input in horsepower of compressor. 5. Coefficient of performance.
Problem 6 The refrigeration system using R-22 refrigerant consists of 3 evaporators of capacities 30 ŤR, 20 TR and 10 TR with individual expansion temperature in the 3 evaporators is to be maintained at -10°C, 5ºC and 10°C respectively. The vapor leaving the evaporator is dry and saturated. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is sub cooled to 30°C. Assuming isentropic compression, find: a) Mass of refrigerant flowing through each evaporator, b) Power required to drive the system and c) COP of the system. as valves and compressors. The
REFRIGERATION In a freon-22 refrigeration system, the capacity is 20 tons at a temperature of -20°C. The vapor from the evaporator is pumped by one compressor to the condensing pressure of 40C. Later, the system was revised to a two-stage compression operating on the cycle with intercooling but no removal of flash . Answer the ff: a. Calculate the power required by the single compressor in the original system. b. Calculate the total power required by the two compressors in the revised system.
I need help I missed classes and idk how to do it ! Help

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