PROBLEM 2 : An ammonia simple saturation cycle operates evaporator and condenser temperatures of -20°C and 35°C, respectively. The system is to be used in producing 6000 kg of ice at -12°C from water at 29°C in 10 hours. Assuming losses to be 30 per cent of the heat to be absorbed from the water, determine (a) the mass flow rate, (b) the heat rejected at the condenser, and (c) the power required by the compressor.

PROBLEM 2 : An ammonia simple saturation cycle operates evaporator and condenser temperatures of -20°C and 35°C, respectively. The system is to be used in producing 6000 kg of ice at -12°C from water at 29°C in 10 hours. Assuming losses to be 30 per cent of the heat to be absorbed from the water, determine (a) the mass flow rate, (b) the heat rejected at the condenser, and (c) the power required by the compressor.

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

اريد حل كتابة يد
An r-134a refrigerator operates a simple vapor compression cycle (SVCC). The evaporatoroperates at -10 °C, while the condenser operates at 1 MPa. R-134a flows around the system at 10 g/s.a. Graph the cycle in a P-h diagram and calculate the temperature at the exit of the compressor, assuming it is 100% isentropicallyefficient.b. Calculate the power required by the compressor (in W) and the cooling effect of the refrigerator (in kW) c. Compute for the COP of the system. What is its percent difference from the reversible efficiency?
An ammonia ice plant produces ice from water at 30°C to ice at -5°C. It works on standard vapour compression cycle, dry saturated conditions at compressor inlet. The enthalpies at compressor inlet and condenser exit are 1443.9 kJ/kg and 366.1 kJ/kg. Mass flow rate of the refrigerant is 180 kg/h. The ice produced is. tons per day. Specific heat of water = 4.186 kJ/kgK; Specific heat of ice = 1.94 kJ/kgk Latent heat of water at 0°C = 335 kJ/kgK
42. Refrigerant-12 enters the condenser of a vapor-compression refrigera- tion system at 175 psia and 140°F and leaves as saturated liquid at 120°F. Mass flow rate of the refrigerant is 4.8 lbm/min. The heat is rejected to the surrounding air, which is at 90°F. Determine: (a) Heat rejection rate, Btu/hr. 22 (b) Separate the overall entropy changes per hour (Freon and sur- roundings). 23/
Superheated steam from the boiler expands in the turbine from inlet pressure p₁ of 50 bar and temperature 7 of 487 °C to condenser pressure p2 of 18 kPa. In the condenser, the steam condenses to saturated water. The isentropic efficiency of the turbine ns is 78.0 %. The mass flow of steam 9m,h is 140 kg/s. In the boiler, heat flow rate to the circulating fluid (water/steam) is 458 MW. Read from h,s-diagram and calculate: 1. Enthalpy of the superheated steam h kJ/kg (with zero decimal accuracy) 2. Enthalpy of the steam at turbine outlet after isentropic expansion h₂s kJ/kg (with zero decimal accuracy) 3. Enthalpy of the steam at turbine outlet h₂ kJ/kg (with zero decimal accuracy) 4. Turbine power Pt MW (with one decimal accuracy) 5. Steam content at the turbine outlet X2 kJ/kg (with two decimal accuracy) 6. Enthalpy after condenser h3 kJ/kg (with zero decimal accuracy) 7. Thermal power of condenser Qc 8. Thermal efficiency of the plant n MW (with one decimal accuracy) % (with one…
8.
Can you show also the T-S diagram and P-h diagram A Single Stage Vapor Compression (SSVC) refrigeration system has a cooling capacity of 6 tons. The discharge of the evaporator is at -20°C & 0.1 MPa and the discharge of the condenser is at 30°C & 1.0 MPa. Determine the following: (a) the COP of the system, (b) the Energy Efficiency Ratio in kJ/hr/W
provide solutions using the ASHRAE tables and charts A standard ammonia vapor-compression cycle developing 20 tons of refrigeration operates with a condensing temperature of 32°C and an evaporating temperature of -14°C. Calculate the ..
Refrigerant 22 is the working fluid in a Carnot vapor refrigeration cycle for which the evaporator temperature is -30°C. Saturated vapor enters the condenser at 36°C, and saturated liquid exits at the same temperature. The mass flow rate of refrigerant is 10 kg/min. Determine the power input to the compressor, in kW, (A) 6.72 (B) 5.35 7.76 3.51 D
Please help!!!! Refrigerant 22 enters the compressor of an ideal vapor-compression refrigeration system as saturated vapor at -30°C with a volumetric flow rate of 10 m3/min. The refrigerant leaves the condenser at 19°C, 9 bar. Determine: (a) the magnitude of the compressor power, in kW. (b) the refrigerating capacity, in tons. (c) the coefficient of performance. (d) the rate of entropy production for the cycle, in kW/K. Answer for part (a): 52 kW Answer for part (b): 59 tons Answer for part (c): 3.98 Please answer part also d! That's the part I also need. Thank you!
1. A. Using the Steam Tables, determine the amount of cooling water needed by a condenser in kg/sec if wet steam comes into the condenser at P= 610.44mmHG vac and 99.47 % moisture, mass flow rate = 7200 + (10/13) kg/hr. Cooling water enters the condenser at 12 deg Cand leaves at 21 deg C. Answer: diagrams below. Cp H20 = 4.187 KJ/kg-K): Schematic diagram of heat exchanger =condenser B. Draw the schematic diagram of the condenser and process in the PV and TS V 2. Use only the MD below to solve this Item; use it by plotting data and process to determine items being asked. Steam enters a turbine at 117.4308 atmgage and 932 deg. F, and expands isentropicaly to 177.17 inches of Hg. For 2 + (10/13 kg/sec of steam, what is (a) the ideal work done (KJ/sec) if AKE = 0 and actual exhaust enthalpy is 2700 KJ/kg. a)Ans: (b)ne =. (c]Determine: ideal steam moisture at exhaust. Ans: (d) Actual steam quality at exhaust Ans: (e) Actual steam temp g) change in entropy during the actual process. at the…
The digital thermometers that we use in the lab today are similar to the ones that we use in our homes, but several years ago scientists used to use glass thermometers that contained a thin column of mercury to measure temperature. Why do you think we no longer use the mercury thermometers in the lab?