What happens when relative humidity (RH) = 100%? a)if the air is continued to be cooled, at what temperature will the saturation point be reached? b)What happens if the air is continued to be cooled below the DBT you just found?
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What happens when relative humidity (RH) = 100%?
a)if the air is continued to be cooled, at what temperature will the saturation point be reached?
b)What happens if the air is continued to be cooled below the DBT you just found?
(psychrometric chart image)
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- 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] 6Q1- A wet gas has composition as given below. Determine a value of z-factor for this gas at reservoir conditions of 5709 psig and 293°F. * Composition, mole percent Component Hydrogen sulfide Carbon dioxide Nitrogen Methane Ethane 8.67 Propane i- Butane n-Butane i- Pentane n-Pentane Hexanes 1.40 0.45 79.81 5.28 1.71 0.55 0.53 0.24 0.19 0.24 0.93 Heptanes plus 100.00 Properties of heptanes plus Specific gravity Molecular weight 0.759 132 Ib/lb moleQ2) Air is supplied to an automobile cabin from the outside, where the temperature is 20F and the relative humidity is 70%. It is desired to keep the cabin at 70F and Ø = 60%. Hoe many pounds of water must be supplied to each pound of air entering the car cabin if these conditions are to be met? The barometric pressure is 29.5 in.Hg. %3D Ans. (0.00797 lbs/Ibdry air)
- 55°C methanol flows over a 4m long 2m width flat plate with temperature of 25 C. The velocity of methanol is 1.08 km/h. Determine the total drag force and the rate of heat transfer from the entire plate. What is the value of x_ and what does it mean?Based on the conversion table below, what is the dry bulb temperature if the relative humidity is 63% and the wet bulb temperature reading is 20C? Express your answer in degrees Celsius (excluding units).Through the following formulas: (100-FGM) DP 100-IGM WGI= where: WGI - Wet grain input in ton/h DP-Dryer performance in ton/h FGM - Final grain moisture in % IGM - Initial grain moisture in % EP =WGI-DP where: EP - Evaporation power in ton+₂0/h EC = GC HP where: EC - Energy consumption in kcal/h GC-gasoil consumption in kg/h HP-heating power of gasoil in kcal/kg SEC where: SEC - Specific energy consumption in kcal/kgH20 Select which of the following specific energy consumption options correspond to a dryer that has a performance of 40 tons/h, and is required to reduce grain moisture from 17% to 13.5%. Data: EC EP-1000 heating power of gasoil-10100 kcal/kg gasoil consumption=213 kg/h Answer 500-1000 kcal/kg H20 1500-2000 kcal/kg H20 1000-1500 kcal/kg H20 O O O
- Select all temperature-pressure values which indicate SATURATED conditions. O 361.54 C and 19 MPa 374.14 C and 22.089 MPa O104.716 C and 0.120 MPa 0.7917 MPa and 168 C 2.3385 kPa and 19 CASHRAE standard 55, Thermal Environmental Conditions for Human Occupancy, notes that for thermal comfort purposes, the indoor temperature should range from approximately 67ºF to 82°F (19.4ºC to 27.8ºC), and systems designed to control humidity must be able to maintain a dew-point temperature of 16.8°C (62.2°F). ASHRAE standard 62.1, Ventilation and Acceptable Indoor Air Quality, recommends that relative humidity in occupied spaces be controlled to less than 65% to reduce the likelihood of conditions that can lead to microbial growth. Determine the minimum allowable indoor temperature that will ensure a humidity control system designed according to ASHRAE standard 55 will also satisfy the humidity requirements of standard 62.1What is the maxmium specific humidity of air at -30C is ________________and the maximum specific humdity of air at -10 C is _______________; therefore, the difference in maximum specific humidity between -30C and -10C is _____________. The maximum specific humidity of air at 30 C is ________________ and the maximum specific humidity of air at 10 C is ____________; therefore, the difference in maximum specific humidity between 30C and 10C is ______________.
- 300°C steam flows in a stainless-steel (ss.) pipe with thermal conductivity of 50 W/m.K. The pipe has internal diameter (ID) of 40 cm, and outer diameter (OD) of 42 cm. The pipe is placed in another ss. pipe with ID and OD 44 cm and 44.2 cm, respectively. The gap between the pipes is filled with steel air (use air properties at 160°C from appendix). The convection heat transfer coefficient at the inner and the outer surfaces of the pipe is hi = 40 W/m2. K and h2= 15 W/m?. K. Determine the rate of heat loss if the length of the pipe %3! is 10 m. Also determine the temperature at inside, intermediate and outer surfaces.When The process is accorcing to a law iso thermal. takes place in a perfectly thermally b. C. insulated Cylinder. 8=1.3 Ans.[ 270 i 5.138 1g1.713 1J,52.6i,sSiky.-5.51, 219 5251g, o leg] University of Anbar College of Engineering Mechantont Englning Dpartment Year (Sophomore year) THERMODYNAMICSA Lec. No. Date: / 202 ME2303 Instructor: Asst. Prof. Dr. Saad M. Jalil hr Page Na. Q7 225 1g Ih of air at 4o% enter amixing chamber where it mixes with 540 kg /h of air at isi. Calculate the temperature of the air leaving the Chamber. assuming steady flow conditions. A ssume that the heat loss is negligible . Ans [22.4c] Q8: Aquantity of gas occupying o14n at a pressure of 1.4MNIM? and temperature of 300 č is expanded adiabatirally to 280 K Nimi Cv = 0. 74 Kg 11eg K p=1o41g ng - detennine: a. the mass of gas b. the temperature of the gas after expansion. work done during the expansion. Ans-fa-1.14 kg C. the b. ४३१ C. 180 lT ) Internal mC,(T2-T1) mC,(T2-T11 of 13 The temp. of the air in a dryer is maintained constant by the use of steam coils w/in the dryer. the product enters the dryer at the rate of one metric ton per hour. The initial moisture content is 3 kg moisture per kg of dry solid. Air entors the dryer w/ humidity ratio of 0.016 kg moisture per kg. of dry air & leaves w/ a relative humidity of 100 % while the temp. remains constant at 600C. If the total pressure of air is 101.3 kPa. dotermine: a. Total required amount of air in kg / hr. under entrance condition b. Capacity of forced draft fan to handle this air in m3 / min. NOTE: at pt.3: @600C. Psat 19.94 KPa & Pv = Psat. HR2 = 0.016 kg w.v. / kg d.a. V2 = 0.9675 m3 /kg HR3 = 0.1524 kg w.v. / kg d.a. O a. 5,200 kg/ hr b. 87.50 m3 / min O a. 4.315.25 kg / hr b. 95 m3 / min O a. 5,315.25 kg/ hr b. 88.70 m3 / min a. 5,315. 25 kg /hr b. 85.708 m3 / min.