Fresh air at 21.1 C in which partialpressure of water vapor is 0.018atmosphere is blown at the rate of 214m3/h first through a preheater and thenadiabatically saturated in spray chambersto 100% saturation and again reheatedthis reheated air has humidity of 0.024 kgwater vapor per kg dry air. It is assumedthat the fresh air and the air leaving there-heater have the same percentagehumidity.Determine:-a- The temperature of preheater,spray-chamber and re-heaterb- Heat requirement for preheating andre-heating11:39 م

Answered: Image /qna-images/answer/05e8df59-927a-46fa-a83a-11cd90f1913e.jpg

Answered: Fresh air at 21.1 C in which partial…

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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How high a relative humidity must a 35°C air have in order to obtain saturated airat 18°C by evaporative cooling? solve with complete diagram
Moist air, which contains 2.30 mol% Hz0, at 25°Cand 100 kPa is to be dehumidified so thatduring its passage through a large cold room, ice formation can be avoided on the chilling coils in the room. Two suggestions have been offered: (1) Cooling the moist air atconstant pressure (2) Compressing the moist air atconstant temperature 1. Whatpressure should the moist air in process (2) reach for the process to obtain 60% percentremovalof water?
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Pls. Anwer my quistion.. Thank you! Air enters an air-conditioning system that uses refrigerant-134a at 30OC and 70 percent relative humidity at a rate of 4 m3 /min. The refrigerant enters the cooling section at 700 kPa with a quality of 20 percent and leaves as saturated vapor. The air is cooled to 20OC at a pressure of 1 atm. Determine (a) the rate of dehumidification in kg/min (b) the refrigerating Effect in KJ/min (c) the mass flow rate of the refrigerant in kg/min
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QUESTION 1 Water at 60°C leaving a condenser at the rate of 22.5kg/s is sprayed into a natural-draught cooling tower and leaves it at 27°C. Air enters the tower at 1.013bar, 13°C and 50% relative humidity and leaves it at 38°C, saturated. Take Cp for the superheated vapour as 1.86 kJ/kgK. Calculate: 1.1. the air flow rate required in m/s; 1.2. the make-up water required in kg/s.
A volumetric flow rate of 3750 m'h of outside air at 39 °C dry bulb and 26 °C wet bulb temperatures is to mixed with 8250 mh of return air at 25 °C and 50% rgative humidity before entering a cooling coil in an conditioning device. The mixture leaving the coil.at0% relative humidity is then supplied to the space sensible heat ratio of the conditioned space is 0.75) Sketch the process on the psychrometric chart and t the followings: a) The dry bulb temperature of the supply air. b) The cooling coil capacity, kW. c) The apparatus dew point and supply air dew.point temperatures. d) The sensible and latent heat loads of the space. e) The bypass factor of the cooling coil. The rate at which moisture is removed from air.
5. Dry winter atmospheric air at latm, 8°C and 50% bumidity enter an HVAC system at a rate of 10m/hr, where it is isobarically conditioned to 21°C, 50% humidity. A water line supplies saturated water vapour. Determine heating or cooling rate required to accomplish this process. Also determine the rate wat which water must be supplied in the system in KW. Take heat of vaporization of water to be 2539.9kJ/kg. Note IKJ/S = 1KW
What is amount of entropy generation "kJ/K" during the condensation of a 2.8 kg of a pure substance "latent heat of vaporization of 1024.04 kJ/kg.K, T 55 C" and the surroundings are at 30 C? sat
Moist air at 21 C° DBT and 15 C° WBT and standard atmospheric pressure is humid by water spray. If for each one kg of dry air passing through the duct 0.002 kg of wa 100 C° is injected and totally evaporated. Draw the psychometric and schematic figu process and calculate for the air leaving the a- The moisture content. spray chamber: b- The enthalpy c- Dry bulb temperature.

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