A- Answer the following: 1- How does humidity affect human comfort? 2- Consider the adiabatic mixing of two airstreams. Does the state of the mixture on the psychrometric chart have to be on the straight line connecting the two states? 3- In winter is the temperature of weather increase or decrease when the rain starts?

A- Answer the following: 1- How does humidity affect human comfort? 2- Consider the adiabatic mixing of two airstreams. Does the state of the mixture on the psychrometric chart have to be on the straight line connecting the two states? 3- In winter is the temperature of weather increase or decrease when the rain starts?

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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a stream of outdoor air is mixed with a stream of return airin an airconditioning system that operates at 101 kpa pressure.the flow rate of outdoor air is 3kg/s and its condition is 30 C Tbd and 23 C Twb. the flow rate of return air is 2.5 kg/s and its condition is 15 C Twb and 60% RH. Determine:a - enthalpy of mixture b - humidity ratio of mixturec- dry bulb temperature of mixtured- dry bulb temperature by the weighted average of the dry bulbtemperature of the entering streams
Dry air inlet temperature 23.9 (t1) Wet air inlet temperature 20.5 (t2) Dry air outlet temperature 24.3 (13) Wet air outlet temperature 23.1 (14) Inlet (A) Outlet (B) Set 2 Set 1 T [°C] Inlet (A) Outlet (B) (b) By using the psychrometric chart, fill up the table below for mass balance. Set 1 v[m/kg dry w[kg/kg dry air] Inlet (A) Outlet (B) 0.0183 0.017 [kg/kg dry air] 61 Set 2 T [°C] 68 24.2 20.8 25.4 24.5 aur] 0.86 v[m³/kg dry air m (c) By using the psychrometric chart, fill up the table below for energy balance. het [kJ/kg dry air] het [kJ/kg dry air [kg dry air/s] 0.0586 m [kg dry air/s] 6
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
c. dew-point temperature d. mass of water vapor contained in the room 2.50 A 20 by 12 by 8 ft (6.1 by 3.6 by 2.4 m) room contains an air-water vapor mixture at 80°F (26.7°C). The barometric pressure is standard and the partial pressure of the water vapor is measured to be 0.2 psia (1.38 kPa). Calculate relative humidity b. humidity ratio а.
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.
During cooling and dehumidification process briefly describes how the psychrometric properties below behaves: Dry bulb temperature Wet bulb temperature Dewpoint temperature Relative humidity Specific humidity / Humidity ratio Specific enthalpy Specific volume
Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and a humidifier that supplies wet steam (saturated water vapor) at 100°C. Air enters the heating section at 10°C and 70 percent relative humidity at a rate of 32 m /min, and it leaves the humidifying section at 20°C and 60 percent relative humidity. Use data from the tables. Sat. vapor 100°C Heating coils Humidifier 10°C Air 20°C 70% 60% ymYmin P=1 atm Determine the temperature and relative humidity of air when leaves the heating section. The temperature is °C. The relative humidity is %.
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
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
By hand
The reading taken in a room from sling psychrometer gave a dry and wet bulb temperature of 25°C and 19.7°C respectively. Using psychrometric equation and psychrometric chart, determine: a. specific humidity b. relative humidity c. dew point temperature d. specific volume e. enthalpy