A summer air conditioning system, consisting of a cooling coil and a reheat coil, supplies air to a space maintained at 25°C db-temperature and 18°C wb- temperature. The sensible and latent heat loads on the space are 15 kW and 10 kW respectively. The conditions of the air leaving the cooling coil are 12°C db-temperature and 90% relative humidity. The pressure is constant at 101.325 kPa.

A summer air conditioning system, consisting of a cooling coil and a reheat coil, supplies air to a space maintained at 25°C db-temperature and 18°C wb- temperature. The sensible and latent heat loads on the space are 15 kW and 10 kW respectively. The conditions of the air leaving the cooling coil are 12°C db-temperature and 90% relative humidity. The pressure is constant at 101.325 kPa.

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

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.
An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and anevaporative cooler. Air enters the heating section at 14°C and 60 percent relative humidity at a rate of 30m3/min, and it leaves the evaporative cooler at 25°C and 45 percent relatively humidity. Determine (a) thetemperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in theheating section, and (c) the rate of water added to air in the evaporative cooler.
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.
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.
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.
Air enters the heating section of an air-conditioning at 1atm, 10C, and 70 percent relative humidity at a rate of 35m^3/min, and it leaves the humidifying section at 20C with a relative humidity of 90 percent. If the humidifier supplies wet steam at 100C, determine: The temperature and relative humidity of the air leaving the heating section The rate of heat transfer in the heating section
which of the following properties is NOT true about moist air at standard condition which is at a dry bulb temperature of 340C and humidity ratio of 10g w/kg da ? 1. the relative humidity of the air is about 30% 2. The enthalpy of the air is about 55kj/kg 3.The specific volume of the air is about 0.884 m3/kg 4.The dew point temperature of the air is about 140C
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
How many TOR is required to cool 472.3 liters per second of air from 35 °C DB and 26 °C WB to 27 °C DB and 50% relative humidity?
A summer air conditioning system, consisting of a cooling coil and a reheat coil, supplies air to a space maintained at 25°C db-temperature and 18°C wb-temperature. The sensible and latent heat loads on the space are 15 kW and 10 kW respectively. The conditions of the air leaving the cooling coil are 12°C db-temperature and 90% relative humidity. The pressure is constant at 101.325 kPa. Determine:The db-temperature in °C.The dry air mass flow rate of the air supplied in kg/s.The refrigeration capacity of the cooling coil in kW.The rate of heat input by the reheat coil in kW.The bypass factor of the cooling coil in %.
. Moist air exits at a condition of 100 F dry-bulb temperature, 65 F thermodynamic wet bulb temperature, and 14.696 psia pressure. Determine (a) humidity and (b) The volume'
Which is better for humidifying air, adding steam or water? Justify?