3. An evaporative cooling tower with an induced draft fan at the air exit is used by a large air- conditioning facility located in a City. The circulating water flow rate is 7.57 m³/min and the water enter the cooling tower at 38 ° C. The air inlet conditions are 27 ° C dry bulb and 16 ° C wet bulb. The exit air is at 32°C and 90% relative humidity. Determine the air flow rate required to cool the water to 27°C and the quantity of water evaporated. The makeup water is available at 27°C.

3. An evaporative cooling tower with an induced draft fan at the air exit is used by a large air- conditioning facility located in a City. The circulating water flow rate is 7.57 m³/min and the water enter the cooling tower at 38 ° C. The air inlet conditions are 27 ° C dry bulb and 16 ° C wet bulb. The exit air is at 32°C and 90% relative humidity. Determine the air flow rate required to cool the water to 27°C and the quantity of water evaporated. The makeup water is available at 27°C.

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

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
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.
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.
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.
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.
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.
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.
Atmospheric air with an air flow rate of 200 liter/min and a dry bulb temperature of 35 °C and relative humidity of 40 % is cooled to 10 °C using an air conditioner. Determine: a) How much water per hour is removed from the air during the process; b) The cooling capacity of the air conditioner required to cool the air.
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.
Compute the enthalpy of air at 60 percent relative humidity and 34 deg.C (Psat = 5.318 kPa), when the barometric pressure is 110 kPa.
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.
15 kg of air at 2bar and 25oC mixed adiabatically in steady flow mixing chamber with 1kg air at 0oC, the temperature of new air is about: