A test of a 30-TR ammonia vapor compression refrigeration system gave the following results: Coefficient of performance 3.1 Condenser pressure 1600 kPa Evaporator pressure 191 kPa Temperature leaving evaporator coils -10 C Temperature entering compressor 0 C Temperature leaving compressor 100 C Temperature entering condenser 80 C Temperature leaving condenser 35 C Find, (a) the work, and (b) the heat absorbed by jacket water

A test of a 30-TR ammonia vapor compression refrigeration system gave the following results: Coefficient of performance 3.1 Condenser pressure 1600 kPa Evaporator pressure 191 kPa Temperature leaving evaporator coils -10 C Temperature entering compressor 0 C Temperature leaving compressor 100 C Temperature entering condenser 80 C Temperature leaving condenser 35 C Find, (a) the work, and (b) the heat absorbed by jacket water

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems

Section: Chapter Questions

Problem 22RQ: Variable refrigerant flow systems sense the ______and _____of the refrigerant to determine the...

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Condenser 30 c „Flash Chamber Pi Evaporator OC & 50 kW For a 2-stage ammonia compression system, determine: 1. Draw the PH diagram showing the condenser, evaporator, & compressor discharge temps, intercooler pressure, all enthalpies & compressor suction specific volumes, m/kg 2. Compute the intercooler pressure in Bars & equivalent Ti in °C 3. Compressor discharge temps T: & T4 4. Mass of refrigerants m:, ms & m: in kg/sec 5. Compressor power Wi, W & total W- in kW & HP 6. Compressors PD with equal volumetric efficiency 80%; m/s 7. Condenser capacity, kW 8. Using a single stage compression, calculate & compare the power of the compressor/s in kW & HP
Additional Instructions: Define each enthalpy obtained from tables and chart and draw the p-h diagram labeling the respective evaporating and condensing pressures and temperatures in each problem. Simple Vapor Compression Refrigeration System 53 PROBLEMS (1) An ammonia vapor refrigeration cycle operates at an evaporator temperature of-16 C and a condensing temperature of 32 C. Determine the coefficient of performance (a) for an ideal saturation eycle, (b) for wet compression with saturated vapor leaving the compressor, and (c) if the vapor at suction to the compressor is superheated 6 degrees. Ans. (a) 4.50, (b) 4.70, (e) 4.28
What is the coefficient of performance of the refrigeration plant mentioned in # 3?* a. 3.1 b. 3.4 c. 3.7 d. 3.9
4. What is the coefficient following properties: A. 4.5 B. 5.5 of performance of a vapor compression refrigeration system with the Enthalpy at compressor inlet is 190 kJ/kg Enthalpy after compression is 210 kJ/kg Enthalpy after condensation is 60 kJ/kg. C. 6.5 D. 3.5 Activate W Go to Setting
Q.2: A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature 42°C. -8°C and the condensing temperature (a) Determine the volume flow of refrigerant measured in cubic is meters inlet at the to the compressor. second per (b) Calculate the power required by the compressor. (c) At the entrance to the evaporator what is the fraction of vapor in the mixture.
The values of a vapor compression refrigeration cycle were given below. Calculate the values ofrefrigerant flow rate, refrigeration capacity, and the COP of the system.T1= Evaporator water outlet = 10 °CT2= Evaporator water inlet = 16 °CT3= Condenser water inlet = 16 °CT4= Condenser water outlet = 22°CCooling water flow rate = 1.5 L/minHeating water flow rate = 1.5 L/minEnthalpy of R134a in evaporator outlet = 305 kj/kg,Enthalpy of R134a in evaporator inlet =115 kj/kgEnthalpy of R134a in condenser inlet =327 kj/kg
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,
(b) Determine the cooling load (q₁), heat rejection (q) and actual compressor work input (w) per unit mass in kJ/kg. . C. (c) Calculate the coefficient of performance (COP) of this actual refrigeration cycle and compare it with the COP of a reversed Carnot cycle for refrigeration if used under the same inside and outside amblent temperatures.