In an ice-making plant, water (at a rate of 2500 kg/h) at 0°C is frozen at atmosphere pressure byevaporating R-134a. 333.7 kJ/kg of heat is removed from water per unit mass in order to freeze it intoice. The refrigerant enters as saturated liquid at -16°C, and leaves this evaporator as a saturated vapor.If we take the R-134a and its immediate surroundings as a system, determine the rate of entropygeneration during the evaporation process.Water at 0°CR-134a-16°CSat. liquid-16°CSat. vapor

Answered: In an ice-making plant, water (at a…

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

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A heat-insulated (adiabatic) constant volume vessel divided by a metal curtain. The volume of the compartments is not equal!. Initially, one of the chambers contains 2.5 kg of compressed s-phase water at a temperature of 60 °C and a pressure of 600 kPa. The other chamber is empty (vacuum). Then the metal curtain is lifted and the water covers the entire volume. Since the final pressure is 10 kPa, calculate the volume of the container and the final temperature of the water
Please do not use the answers to calculate the answer, Find the answer the normal way.
Steam at a pressure of 11 bar and a temperature of 320C is containedin a large vessel. Connected to the vessel through a valve is a turbinefollowed by a small initially evacuated tank with a volume of 0.60 m3.When emergency power is required, the valve is opened and the tankfills with steam until the pressure is 11 bar. The temperature in the tankis then 400C. The filling process takes place adiabatically and kineticand potential energy effects are negligible. Determine the amount ofwork developed by the turbine in kJ.
5.0 kg of steam at 0.7 MPa and 250oC enters a pipeline and flows steadily along with it at constant pressure. If the steam rejects heat steadily to the surrounding, A. at what temperature will droplets of water begin to form in the vapor? B. how much heat is rejected at the instant droplets of water start to appear alongside the pipeline? C. calculate the heat rejected in KJ if 1.5 kg of droplets of water begin to form alongside the pipeline. D. Draw the complete Ts diagram of the given process.
A 110-volt 6 Ampere electric heatrer is submerged in 1 kg of water for 24 minutes. What will be the final temperature of the water if its initial temperature is 23 C. Assume a heat loss of 13%.
An adiabatic vessel has a valve that allows some water to be released. Initially it has 500 Kg of saturated liquid wate at a temperature of 50°C. Find the following: The temperature of remaining water if 10 Kg of water vapor escapes through the valve. If the remaining water is at 20°C, find the amount of water escaped as vapor. Assume specific heat of water, C = 4 Kj/Kg-K and Enthalpy of vaporization of water, AHvap 2400 Kj/Kg
A mass of ice at -7 C is needed to cool 224 kg of vegetables (Cp = 3.35 KJ /kg.K )in a bunker for 24 hours. The initial temperature of the vegetables is assumed to be 29 C . It is also assumed that the average temperature in the bunker is 7C within the 24 -hour period . If the heat gained per hour in the bunker is 25% of the heat removed to the vegetables from 29 C to 7C, what would be the required mass of ice ? show t-s diagram
blait (Q3) Refrigerant-134a enters a compressor at 180 kPa and 50°C at a rate of 195 m³/s and leaves at a pressure of 800 kPa The refrigerant experiences a heat loss through the casing to the surrounding at a rate of 2 kJ/kg. The power input to the compressor is 410 kW. Determıne (a) the mass flow rate of the refrigerant and (b) the exit temperature. R-134a
A frictionless piston-cylinder device contains 0.25kg of saturated vapor refrigerant 134a at 200kPa. The refrigerant is heated by passing current through an electrical heated rated at 220V and 5 A for period of 30 Second. During the process 15 kJ of heat is transferred from the refrigerant to the surrounding air. Sketch the process on a T-v diagram and determine: The final temperature of the refrigerant, °C. The boundary work during the process, kJ
Water is heated with the aid of a diesel furnace. 2kg of diesel fuel is required for every 300 litres of water. If the heat transfer efficiency is 85%, determine the final temperature of the water. The initial temperature of the water is 200C. assume the calorific heat value of diesel to be 31,5MJ/kg.
Thermodynamics Refrigerant R-134a to the compressor of a refrigeration machine It enters at 140 kPa pressure and -10 °C, and exits at 1 MPa pressure. Volumetric flow of the refrigerant entering the compressor It is 0.23 m³/minute. The refrigerant enters the throttling valve at a pressure of 0.95 MPa and at 30 °C, and exits the evaporator as saturated steam at -18 °C. Adiabatic efficiency of the compressor It is 78%. Show the cycle in the T-s diagram. And; a) Calculate the power required to run the compressor. b) Calculate the heat absorbed per unit time from the cooled medium. ( COPSM=? ) c) Calculate, between the evaporator and the compressor, how much the pressure of the refrigerant drops and how much the heat gain.
elesi X3 5-83 Refrigerant-134a at 700 kPa, 70°C, and 8 kg/min is cooled by water in a condenser until it exists as a saturated liquid at the same pressure. The cooling water enters the condenser at 300 kPa and 15°C and leaves at 25°C at the same pressure. Determine the mass flow rate of the cooling water required to cool the refrigerant. Answer: 42.0 kg/min

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