A drier is to be designed to reduce the water content of a certain material from 55% to 10%. Air at 29 C dry bulb temperature and with a humidity ratio of 0.005 kg/kg is heated to 50 C in a reheater before entering the drier. The air leaves the drier at 38 C with 70% relative humidity. On the basis of 1000 kg of product per hour, calculate (a) the volume flow rate of air entering the reheater, and (b) the heat supplied in the reheater.

A drier is to be designed to reduce the water content of a certain material from 55% to 10%. Air at 29 C dry bulb temperature and with a humidity ratio of 0.005 kg/kg is heated to 50 C in a reheater before entering the drier. The air leaves the drier at 38 C with 70% relative humidity. On the basis of 1000 kg of product per hour, calculate (a) the volume flow rate of air entering the reheater, and (b) the heat supplied in the reheater.

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

Calculate (a) the specific volume, (b) Enthalpl, and (e) the absolute humidity of the air at 45 ° C and the relative humidity of 20% at a barometric pressure of 740 mm Hg. (a) specific volume = m³ / kg (b) Enthalpy = (kJ / kg air) (c) absolute humidity = (kg water / kg air)
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.
Calculate (a) the specific volume, (b) Enthalpy, and (c) absolute humidity at 40 udaraC and relative humidity at 49%, at a barometric pressure of 740 mm Hg. (a) Specific volume = m3 / Kg.(b) Enthalpy = (kJ / kg air)(c) Absolute humidity = (kg water / kg air)
A dryer is to deliver 1000 kg/hour of palay with a final moisture content of 10%. The initial moisture content in the feed is 15% at atmospheric condition with 32°C dry bulb and 21°C wet bulb. The dryer operates adiabatically while the relative humidity of the hot humid air from the dryer is 80%. If the steam pressure supplied to the heater is 2 MPaa, determine the following, show solution in an orderly manner and select the best answer: 1) amount of palay supplied to the dryer in kg/hour а. 14,192 b. 13,980 c. 13,332 d. 13,679 2) amount of air supplied to the dryer in kg/hour а. 1039 b. 1059 c. 1079 d. 1000 3) temperature of the hot humid air from the dryer а. 29.3 b. 26.3 с. 20.3 d. 23.3
An air flow of 15,000 m3/h at 16 ºC and 40% relative humidity, you want to humidify up to conditions of 24 ºC and 80% relative humidity. The make-up water is at 18ºC. Calculate the necessary heat to be applied to the spray water. The specific volume of air at the inlet is 0.852 m3/kg
air flowing at 2 kg / s has a dry bulb temperature of 50 ° C and a wet bulb temperature of 30 ° C, mixed with air flowing at 3kg / s at 25 ° C and a relative humidity of 70%. Using the psycometry chart determine the ratio, enthalpy and temperature of the dry ball
Air flowing at the rate of 80m° /min at 35°C dry bulb temperature and 50% relative humidity is mixed with another stream flowing at the rate of 20m°/min at 21°C dry bulb temperature and 50% relative humidity. The mixture flows over a cooling coil whose apparatus dew point temperature is 5°C and by-pass factor is 0.2. Find dry bulb temperature and relative humidity of air leaving the coil. If this air is supplied to an airconditioned room where dry bulb temperature of 21°C and relative humidity of 50% are maintained, and determine: a) Room sensible heat factor; and b) Cooling load capacity of the coil in tons of refrigeration.
use the principles of psychrometrics
Thermodynamics
Air flowing at the rate of 80m³ /min at 35°C dry bulb temperature and 50% relative humidity is mixed with another stream flowing at the rate of 20m3 /min at 21°C dry bulb temperature and 50% relative humidity. The mixture flows over a cooling coil whose apparatus dew point temperature is 5°C and by-pass factor is 0.2. Find dry bulb temperature and relative humidity of air leaving the coil. If this air is supplied to an airconditioned room where dry bulb temperature of 21°C and relative humidity of 50% are maintained, and determine: a) Room sensible heat factor; and b) Cooling load capacity of the coil in tons of refrigeration.