2. An air-conditioning system is to take in outdoor air at 10 C and 30 percent relative humidity at a steadyrate of 45 m3/min and to condition it to 25 C and 60 percent relative humidity. The outdoor air is first heatedto 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.22 C25 CHeatingHum hiner7,10°C.7-25 C= 30%

Given Data State 1: 10°C, 30% RH State 2:22°C State 3:25°C, 60% RH P=100 kPa

Answered: 2. An air-conditioning system is to…

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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In the C-D duct, with the help of a refrigeration cycle which uses R-134A as a working fluid, atmospheric air is cooled at a rate of 34 m3/min, which is entering at a temperature of 36°C and a relative humidity of fifty%. The enthalpy produced in thisprocess is 29.46 kJ/kg of mass of dry air and it is possible to cool the air to 19°C.During this process the Plant Engineers need to know the flow of water that is extracted from the incoming air and the KW needed for the cooling process if the water leaves at 19.2°C.
Air Conditioning, please help.
السؤال الأول A refrigerant of a certain thermodynamic cycle at a point during the evaporation process where its fraction dryness is 50%, and latent heat of 211.3 kJ/kg. Determine the enthalpy of this refrigerant at this point knowing that its saturated Jiquid enthalpy is 190.7 kJ/kg 307. 67KJ/kg O 267.65 kJ/kg None of the above 296.35 kJ/kg 1:27 PM 91"E Sunny A DE . 5/14/2022
Q2: Answer one of the following: A- Saturated air leaving the cooling section of an A. C system at 14 C° at a rate of 50 m'/min is mixed adiabatically with the outside air at 32 C° and 60 percent relative humidity at a rate of 20 m'/min. Assuming that the mixing process occurs at a pressure of 1 atm. Determine: 1-Humidity ratio 2-relative humidity 3-Dry-bulb Temperature 4-Volume flow rate of the mixture.
A cooling tower of a centralized air conditioning system handles 5,000 m³/h of water which enters the tower at 40°C. The cooled water leaves the tower at 28°C. The drift loss is 0.1% while the blowdown is 0.4%. The water make-up is 150 m³/h at 30°C. The air blown through the tower enters at 25°C and has a relative humidity of 70%. The air leaves the tower at 35°C with a relative humidity of 95%. Calculate the volume of air, in m³/h at ambient conditions that the forced draft fan of the cooling tower handles.
P=19 Moist air goes into air-conditioning unit at a degree-30 C and 70% relative humidity, and it is cooled to 20-degree C and 20% relative humidity at a constant pressure of 1.01325 bar. The mass flow rate of dry air is mda=63 kg/s The unit applies refrigerant R-134a as the cooling fluid that enters inside the tubes of the cooling coil at 3.6 bar with a quality of 0.2 and leaves as a saturated vapor at the same pressure of 3.6 bar. Use the psychometric chart to determine: a) Mass flow rate of condensed water in kg/s b) The heat transfer rate from the air to the cooling coil in kW (Use the psychometric chart) c) The mass flow rate of R-134a that is needed in kg/s
Air enters a humidifier at 34.25°C and 30% RH. If the air leaves the humidifier at 70% RH. Determine: The exit dry-bulb temperature of the air in °C.The saturation effectiveness in %.
In an air conditioning system 30 emm of fresh out door air is introduced at 43°C DBT and 30% RH. The remaining air is recirculated from the room maintained at 25°C DBT and 50% RH. The bypass factor of cooling coil is 0.15 and apparatus dew point Is 11.8°C, RSH 100 kW and RLH 15 kW. Determine: (1) Humidity ratios for outdoor and Room conditions. (2) OASH & OALH (3) ERSH and ERLH (iv) Supply air temperature (v) Supply air volume flow rate using ERSH (vi) Temperature at inlet to cooling coil by assuming density of niside and outside air sanie Given that saturation pressures of water at 25°C and 43C are 3.1693 KP and 8.6459 KPa respectively. Show the process on psychrometric chart standard atmospheric pressure=1.01325 bar.
- A room humidifier works as follows: a stream of air with 20% humidity and a dry bulb temperature equal to 20 °C is mixed with a stream of water also at 20 °C until saturation is reached. Then the saturated air stream passes through a heat exchanger where it is heated. Knowing that the flow rate of the air stream entering the humidifier is 100 m3/h and that the heat exchanger supplies 500 kcal/h to heat the saturated air stream, determinea) the minimum mass flow rate of the water stream to saturate the air stream.b) the temperature and humidity percentage of the air stream at the exit of the heat exchanger.
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
In an air-conditioning unit 3.5 m3/s of air at 28 C dry-bulb temperature, 50 percent relative humidity, and standard atmospheric pressure enters the unit. The leaving condition of the air is 14 C dry-bulb temperature and 90 percent relative humdity. Using properties from the psychrometric chart, (a) calculate the refrigeratingcapacity in kilowatts and (b) determine the rate of water removal from the air
Air enters a humidifier at 34.25°C and 30% RH. If the air leaves the humidifier at 70% RH. Determine: The exit dry-bulb temperature of the air in °C.

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