3-2 Air at 38°Cdb and 20°Cwb and 101kPa is mixed adiabatically with liquidwater supplied at 60°C, in such proportions that the mixture has a relativehumidity of 80%RH. Find the dry-bulb temperature of the mixture.3-3 It is desired to heat and humidify 1.0m/s of air from an initial start definedby a temperature of 16°C dry bulb and relative humidity of 30%RH to a finalstate of 43°C dry bulb and 30%RH relative humidity. The air will first beheated by a hot water coil followed by adiabatic humidification using saturatedvapor at 34.5kPa. Using the psychometric chart, find the heat transfer for theheating coil and the mass flow rate of the water vapor, and sketch the processeson a skeleton chart showing pertinent data.3-4 A meeting hall is to be maintained at 25°Cdb and 18°Cwb. The barometricpressure is 101.3kPa. The space has a load of 58.6kW sensible and 58.6kwlatent. The temperature of the supply air to the space cannot be lower than18°Cdb. (a) how many kg/s of air must be supplied? (b) What is the sensibleheat ratio?3-5 What is the maximum relative humidity to prevent condensation on pipescarrying water at 10°C through a room that has an air temperature of 19°C?3-6 Outdoor air at 38°Cdb and 26°Cwb is cooled to 15°Cdb and 14°Cwb.The process occurs at 101.3kPa barometric pressure. Determine (a) the mass ofwater condensed per kilogram of dry air and (b) the sensible and latent heattransfer per kilogram of dry air and the sensible heat factor.3-7 saturated water vapors at 100°C is used to humidify a stream of moist air.The air enters the humidifier at 13°Cdb and 2°Cwb at a flow rate of 2.5m/s.The pressure is 101.35kPa. Determine (a) the mass flow rate of the steamrequired to saturate the air and (b) the temperature of the saturated air.3-8 A building has a calculated cooling load of 410kw. The latent portion of theload is 100KW. The space is to be maintained at 25°Cdb and 50%RH relativehumidity. Outdoor air is at 38°C and 50%RH relative humidity, and 10% bymass of the air supplied to the space is outdoor air. Air is to be supplied to thespace at not less than 18°C. Assume sea level pressure and find (a) theminimum amount of air supplied to the space in m/s, (b)the volume flow ratesof the return air , exhaust air , and outdoor air ,(c) the condition and volumeflow rate of the air entering the cooling coil ,and (d) the capacity , apparatusdou noint tomnoroturobunege footond SUE of the ooeling oeil

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3-2 Air at 38°Cdb and 20°Cwb and 101kPa is mixed adiabatically with liquid water supplied at 60°C, in such proportions that the mixture has a relative humidity of 80%RH. Find the dry-bulb temperature of the mixture.

3-2 Air at 38°Cdb and 20°Cwb and 101kPa is mixed adiabatically with liquid water supplied at 60°C, in such proportions that the mixture has a relative humidity of 80%RH. Find the dry-bulb temperature of the mixture.

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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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

3-2 Air at 38°Cdb and 20°Cwb and 101kPa is mixed adiabatically with liquid
water supplied at 60°C, in such proportions that the mixture has a relative
humidity of 80%RH. Find the dry-bulb temperature of the mixture.
3-3 It is desired to heat and humidify 1.0m/s of air from an initial start defined
by a temperature of 16°C dry bulb and relative humidity of 30%RH to a final
state of 43°C dry bulb and 30%RH relative humidity. The air will first be
heated by a hot water coil followed by adiabatic humidification using saturated
vapor at 34.5kPa. Using the psychometric chart, find the heat transfer for the
heating coil and the mass flow rate of the water vapor, and sketch the processes
on a skeleton chart showing pertinent data.
3-4 A meeting hall is to be maintained at 25°Cdb and 18°Cwb. The barometric
pressure is 101.3kPa. The space has a load of 58.6kW sensible and 58.6kw
latent. The temperature of the supply air to the space cannot be lower than
18°Cdb. (a) how many kg/s of air must be supplied? (b) What is the sensible
heat ratio?
3-5 What is the maximum relative humidity to prevent condensation on pipes
carrying water at 10°C through a room that has an air temperature of 19°C?
3-6 Outdoor air at 38°Cdb and 26°Cwb is cooled to 15°Cdb and 14°Cwb.
The process occurs at 101.3kPa barometric pressure. Determine (a) the mass of
water condensed per kilogram of dry air and (b) the sensible and latent heat
transfer per kilogram of dry air and the sensible heat factor.
3-7 saturated water vapors at 100°C is used to humidify a stream of moist air.
The air enters the humidifier at 13°Cdb and 2°Cwb at a flow rate of 2.5m/s.
The pressure is 101.35kPa. Determine (a) the mass flow rate of the steam
required to saturate the air and (b) the temperature of the saturated air.
3-8 A building has a calculated cooling load of 410kw. The latent portion of the
load is 100KW. The space is to be maintained at 25°Cdb and 50%RH relative
humidity. Outdoor air is at 38°C and 50%RH relative humidity, and 10% by
mass of the air supplied to the space is outdoor air. Air is to be supplied to the
space at not less than 18°C. Assume sea level pressure and find (a) the
minimum amount of air supplied to the space in m/s, (b)the volume flow rates
of the return air , exhaust air , and outdoor air ,(c) the condition and volume
flow rate of the air entering the cooling coil ,and (d) the capacity , apparatus
dou noint tomnoroturo
bunege foot
ond SUE of the ooeling oeil

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