![how to read carrier psychrometric chart how to read carrier psychrometric chart](https://blog.qwarecmms.com/hubfs/Psychrometric-Chart-1.jpg)
Determine enthalpy, specific volume, humidity ratio and dew point temperature of the mixtureDifferent heat sources of a room Also determine dry bulb temperature, wet bulb temperature and relative humidity of leaving air.Ģ012Manoj PJ Associate professor(MECH)53800 cubic m /minute of re-circulated air at 22C DBT and l0C dew point temperature is to be mixed with 300 cubic m/minute of fresh air at 30C DBT and 50% RH. Calculate specific humidity and enthalpy of leaving air. Dry saturated steam at 100C is injected into air stream at the rate of 72 kg/hr. Manoj PJ Associate professor(MECH)47Ref table 2.1 page 2.1Partial pressure of water vapour= saturation pressure at DPT, that is 150C = 0.017 BarRH = Pv/ Pvs -(1)But Pvs= Saturation pressure at DBT, That is at 210C = 0.0249 BarFrom (1) RH= 0.017/0.0249 = 68%Manoj PJ Associate professor(MECH)48Ģ012Manoj PJ Associate professor(MECH)49The atmospheric air at 25C DBT and 12C WBT is flowing at the rate of 100 cubic m/minute through the duct.
![how to read carrier psychrometric chart how to read carrier psychrometric chart](https://media.cheggcdn.com/study/460/4604924e-64a4-437e-b1c6-ef04ef7a2feb/image.png)
The dew point temperature is 15C.Determine:(a) Partial pressure of water.
![how to read carrier psychrometric chart how to read carrier psychrometric chart](https://i.ytimg.com/vi/Se8Ks_mE6YU/maxresdefault.jpg)
Calculate the temperature and specific humidity of the mixture.Ģ013Manoj PJ Associate professor(MECH)46A mixture of dry air and water vapour is at a temperature of 21C. of air at 20C DBT and 12C dew-point temperature. July 2014(10 marks)Manoj PJ Associate professor(MECH)43One kg. Manoj PJ Associate professor(MECH)41Locate the point 3DBT at point 3= 26 degree C,Specific humidity at 3=0.0102 Kg/ Kg of dry airWBT=18 degree C(point 3 can also be located by dividing the line 1-2 in m1/m2 ratio) Manoj PJ Associate professor(MECH)39At state 1Specific vol= 0.913 cu m / kgSp humidity= 0.017 kg/ kg.h1= 86 KJ/Kg-KAt state 2Specific vol= 0.852 cu m / kgSp humidity= 0.009 kg/ kg.h2= 67 KJ/Kg-K Compute dry and wet-bulb temperatures and specific humidity of the mixture. Manoj PJ Associate professor(MECH)37The makeup air at rate of 100 m3/min from the environment having tdb = 40C and twb = 27C is mixed with 600 m3/min of return air from the conditioned space having state tdb = 23C and relative humidity 50%. Summer air conditioning (Cooling and dehumidification). Heating and Humidification (winter air conditioning) Manoj PJ Associate professor(MECH)27B*Cp*T1 +(1 B)Cp*T2 = 1*Cp* T3B= (T3-T2)/(T1-T2) B= (h3-h2)/(h1-h2)Īlso for cooling Manoj PJ Associate professor(MECH)29B= (h3-h2)/(h1-h2)B= (T3-T2)/(T1-T2)Ĭhemical DehumidificationManoj PJ Associate professor(MECH)30Example silica gel Sensible coolingManoj PJ Associate professor(MECH)25 Sensible heatingManoj PJ Associate professor(MECH)24 Latent heating and latent coolingManoj PJ Associate professor(MECH)22Heating or cooling of air due to addition or subtraction of moisture is termed as latent heating or cooling. Manoj PJ Associate professor(MECH)20Using chartRH=56%Specific humidity= 0.012 kg/kg of dry air.h= 55 kJ/kg of dry airSp vol= 0.85 m3/kg.Sensible heating and Sensible coolingManoj PJ Associate professor(MECH)21Heating or cooling of air without addition or subtraction of moisture is termed as sensible heating or cooling. Calculate (a) the relative humidity, (b) specific humidity, and (c) dew pointAssume standard atmospheric pressure. Manoj PJ Associate professor(MECH)18 A room contains humid air Tdb = 25 0C and wet bulb temperature 19 0C. Manoj PJ Associate professor(MECH)17Using chart RH= 42%Specific humidity= 0.019 kg/ kg of dry air.h= 90 KJ/kg of dry air Specific volume= 0.9 cu.m/kg Manoj PJ Associate professor(MECH)12Due point temperature is the saturation temperature of the water vapour at the existing pressure of water vapour.From the steam table, the saturation temperature at 0.03038 bar is 25 degree CDPT= 25 degree C (table 2.1 page 2.1)Manoj PJ Associate professor(MECH)13
![how to read carrier psychrometric chart how to read carrier psychrometric chart](https://i.pinimg.com/originals/c9/73/f5/c973f54854cbc1ae586705dc8ce53ac6.png)
Calculate.Sp humidity, Relative humidity, Dew point temperature, enthalpy, specific volume / kg of dry air Assume atmospheric pressure to be 1.03 bar.Table 2.1 page2.1Manoj PJ Associate professor(MECH)9Partial pressure of water vapour Manoj PJ Associate professor(MECH)8The sling psychrometer reads 40dgree C DBT and 28 degree C WBT. Manoj PJ Associate professor(MECH)3Psychrometric chart is prepared to represent graphically all the necessary moist air propertiesManoj PJ Associate professor(MECH)4It givesSpecific humidity.RHSpecific volume of the air-vapour mixture.Enthalpy of air-vapour mixture (with datum 0 degree C)Manoj PJ Associate professor(MECH)5 Psychrometric chartManoj PJ Associate professor(MECH)1