To eliminate dust, air with a dry bulb temperature of 38 oC and a wet bulb temperature of 27 oCscrubbed with water. The water temperature is kept at 25 degrees Celsius. The air that is expelled fromthe scrubber is in balance with water. It is then heated to 93 degrees Celsius in an air preheater beforebeing admitted to an adiabatic rotary dryer. The air exits the drier at 49 degrees Celsius. Moisture is lostat a rate of 0.05 kg of water per kg of product. The total product capacity is 1000 kg/h. Calculate thefollowing (using a psychrometric chart):isa. Total weight of dry air used per hour.b. Total volume of air leaving the dryer.

Answered: Image /qna-images/answer/7e4674df-d073-4511-8849-6e7f2a9be552.jpg

Answered: To eliminate dust, air with a dry bulb…

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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In the C-D duct, with the help of a refrigeration cycle which uses R-134A as a working fluid, atmospheric air is cooled at a rate of 34 m3/min, which is entering at a temperature of 36°C and a relative humidity of fifty%. The enthalpy produced in thisprocess is 29.46 kJ/kg of mass of dry air and it is possible to cool the air to 19°C.During this process the Plant Engineers need to know the flow of water that is extracted from the incoming air and the KW needed for the cooling process if the water leaves at 19.2°C.
If the outside fresh-air conditions were to be 93°F dry-bulb and 74°F wet-bulb, what would the total heat content of the air be?
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. The compressor consumes 1.24 kW of power. Use data from the tables. 800 kPa x=0 Jo Expansion valve 19H Condenser Evaporator QL Compressor 800 kPa 35°C Determine the rate of heat absorption from the outside air. The rate of heat absorbed from the outside air is W₁ kW.
1. A standard refrigerating system with a heat exchanger is operating with a condenser pressure of 1571.2 kPa and evaporator pressure of 421.35 kPa using refrigerant R22. If the liquid line from the condenser is soldered to the suction line from the evaporator to form a heat exchanger and if as a result of this, the saturated vapor leaving the evaporator is superheated by 10.
2. A refrigeration system using R-12 is to have a refrigerating capacity of 60 kW. The evaporating temperature is 10°C and the condensing temperature is 42°C. Determine (a) the volume flow rate of refrigerant at inlet to the compressor, (b) the power required by the compressor, and (c) the fraction of vapor mixture at entrance to the evaporator expressed both on a mass basis and volume basis.
Can you also show the plot on the chart provided? The mass flow rate of the refrigerant in a Single Stage Vapor Compression (SSVC) refrigeration system is 0.015 kg/s and the evaporating and condensing temperatures shall be -20°C and 50°C, respectively. Determine the following: (1) cooling capacity in tons, (2) work of compressor in kW, (3) COP of the system, (4) EER of the system, and (5) refrigerating efficiency. Can you also show the plot on the chart provided?
QUESTION 1 The economiser of a steam boiler receives its feed water at 34.6°C and supplies the evaporator at a temperature of 60.1°C. The water is then heated at a constant pressure of 600kPa and delivered with a dryness fraction of 0.73. The super-heater dries and superheats the steam to a specific volume of 0.394m³/kg. Determine the: specific volume of the wet steam;
Air enters a humidifier at 34.25°C and 30% RH. If the air leaves the humidifier at 70% RH. Determine: The exit dry-bulb temperature of the air in °C.The saturation effectiveness in %.
An ammonia system with a 158-kW evaporator operating at -1°C and a 35-kW evaporator operatingat -40°C uses flash gas removal and intercooling. The condensing temperature is 32°C. Thearrangement is as shown. How many kilograms per minute of ammonia are compressed by the high-pressure compressor?
Steam CERE KJ -Valve Control volume boundary Turbine Initially evacuated tank In case of emergencies, a turbine is connected to an active steam pipe line using a valve. When the valve is opened, steam from the pipe line, which is initially at 550°C and 10 MPa, flows through the turbine into a 0.64 m³ tank, which is initially evacuated. The valve is closed when the pressure inside the tank is 1.6 MPa and the temperature in the tank is 300°C. If the entire process is completed adiabatically, what is the amount of work generated from the turbine?
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/
A single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 25 ° C. The evaporator is operated on Steam (80% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 80 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate = Answer kg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = Answer (kg of water evaporated / kg of steam)

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