A chemical laboratory at UJ requires an air conditioning system that maintains the room at 22 °C dry bulbtemperature and 50% relative humidity. The system is mixing 25% of fresh air by mass with 75%recirculated air. The fresh air enters at 35°C dry bulb temperature and 28 °C wet bulb temperature and isadded to the system at a rate of 50 m3/min. For a by-pass factor of the cooling coil of 0.18 and ADP of 8.5°C, determine the mass of air after the mixing, the condition of air after mixing and after cooling, and thecapacity of cooling coil (in kW). Assume the atmospheric air at 101.32 kPaNote: plot points and read properties from psychometric chart. Label the points and draw the processlines on the chart,

The temperature of air measured by a thermometer freely exposed to the air but insulated from…

Answered: A chemical laboratory at UJ requires an…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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A cooling tower receives 6 kg/s of water of 60oC. Air enters the tower at 32oC DB and 27oC WB temperatures and leaves at 50oC and 90 per cent relative humidity. The cooling efficiency is 60.6 per cent. Determine: (a) the mass flow rate of air entering, and (b) the quantity of make-up water required.
In an industrial plant where tires are made, there is a wet cooling tower which fulfills a very important part of the process, it must cool 15 kg/s of watercooling temperature from 45 to 27°C, in a location where the atmospheric pressure is 95 kPa.Atmospheric air enters the tower at 22 °C and 60% relative humidity, and leaves 0.87 saturated at a temperature of 37 °C.Neglecting the power input to the fan, determine the following:1. The volumetric flow of air at the inlet of the cooling tower.2. The mass flow of make-up water required.
300 kg/min of water is required to be cooled from 50°C to 25°C in a wet cooling tower. For these purposes, 730 m3/min of atmospheric air is circulated through it at countercurrent. If the atmosphere is at a pressure of 94 kPa and the dry bulb and humid are 25°C and 15°C, respectively, and in the mixing process 3.7% of water is lost per evaporation, determine*:a) Relative and absolute humidity and dew temperature of the atmosphere.b) Absolute humidity and temperature of the air at the outlet.
An air-conditioning system is to take in outdoor air at 10 C and 30 percent relative humidity at a steady rate of 45 m3/min and to condition it to 25 C and 60 percent relative humidity. The outdoor air is first heated to 22 C in the heating section and then humidified by the injection of hot steam in the humidifying section. Assuming the entire process takes place at a pressure of 100 kPa, determine a. the rate of heat supply in the heating section and b. the mass flow rate of the steam required in the humidifying section.
It is desired to reduce the temperature of the ambient air entering an air handling unit at a volumetric flow rate of 550 m3/min, at a temperature of 35°C and a relative humidity of 0.75 to 20°C and its relative humidity to 0.45. For this purpose, the air is first cooled to a temperature below the dew point by passing through a cooling coil, and after some moisture is taken by condensation, its temperature is increased to 20˚C by passing over a heating coil. In this way, the temperature of the ambient air at the outlet of the air handling unit is brought to 20˚C and its relative humidity to 0.45. It is assumed that the pressure remains constant at P=100 kPa. Relationships will be used in the calculations. a) Calculate the amount of moisture condensed per unit time.b) Find the amount of heat drawn from the air by the cooling coil.c) Calculate the amount of heat given to the air by the heating coil.d) Show the phase changes on the psychrometric diagram.
Two hundred kg/hr of air at 28°C and 50% relative humidity is then heated to 50°C, passed through an adiabatic dryer, and discharge at 40°C and 85% relative humidity. The pressure in the reheater is saturated at 100kPa. Rair=287.08J/kg-K. Atmospheric condition is 101kPa. Calculate the following: 1.) The amount of steam to reheat the air; kg/hr2.) The fan capacity, m3/hr3.) The amount of moisture removed in the feed, kg/hr4.) The moisture content in the feed if the product is 500kg/hr with 8% moisture content, kg/hr5.) The amount of feed< kg/hr
An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and an evaporative cooler. Air enters the heating section at 15OC and 55 percent relative humidity at a rate of 30 m3 /min, and it leaves the evaporative cooler at 25OC and 45 percent relatively humidity. Determine the TOR.
Saturated ambient air with a db-temperature of 5°C and a mass flow rate of 0.9 kg/s is divided into two streams. One stream passes through a heating section and leaves it with a relative humidity of 25%. The conditions of the other stream that bypasses the heater remains unchanged. The two streams are then mixed to produce the supply air stream at 24°C. The pressure is constant at 101.3 kPa. -Determine the partial pressure of water vapor of the heated air in kPa.-The heat input by the heating coil in kW.-The mass flow of air through the bypass section in kg/s.
Air enters a window air conditioner at 1 atm, 32oC, and 65 percent relative humidity ata rate of 80 kg/min, and leaves at 20oC with 50 percent relative humidity. Determinethe cooling capacity of the A.C. in tons and the moisture removal from the air in kg/s.
Saturated air at 13 °C and 1 atm enters the heating section of an air-conditioning system at a rate of 0.5 kg/s and leaves 30 °C. Determine the rate of heat transfer to the air and the exit relative humidity.
The atmospheric air at 30°C dry-bulb temperature and 75% relative humidity enters a cooling coil at the rate of 200 m³/min. The coil dew point temperature is 14°C and the by-pass factor of the coil is 0.1
In an air-conditioning unit 3.5 m3/s air at 27°C dry-bulb temperature, 21°C wet-bulb temperature, and 90 kPa atmospheric pressure enters the unit. The leaving condition of the air is 13°C dry-bulb temperature and 90 percent relative humidity. Calculate the inlet air mass flow rate in kg/s.

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