ASHRAE PSYCHROMETRIC CHART NO.1 ASHRAE NORMAL TEMPERATURE BAROMETRIC PRESSURE COPYRIGHT 1992 SEA LEVEL 101.325 kPa AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC. SENSIBLE HEAT TOTAL HEAT 80, 20 30 ENTHALPY HUMIDITY RATIO 40, 10 50 ENTHALPY h, kag 20. SATURATION TEMPERATURE C 90 25 100 30 DRY-BULB TEMPERATURE, "C 10% RELATIVE HUMIDITY HUMIDITY RATIO w. 9 120 22 110 20 100 60 -0.70 -0.75 -0.00 -0.8 -0.00

ASHRAE PSYCHROMETRIC CHART NO.1 ASHRAE NORMAL TEMPERATURE BAROMETRIC PRESSURE COPYRIGHT 1992 SEA LEVEL 101.325 kPa AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC. SENSIBLE HEAT TOTAL HEAT 80, 20 30 ENTHALPY HUMIDITY RATIO 40, 10 50 ENTHALPY h, kag 20. SATURATION TEMPERATURE C 90 25 100 30 DRY-BULB TEMPERATURE, "C 10% RELATIVE HUMIDITY HUMIDITY RATIO w. 9 120 22 110 20 100 60 -0.70 -0.75 -0.00 -0.8 -0.00

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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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
RH2 = 43% What is the specific humidity of the air stream #1, w1 (lbm H2O/lbm air)? What is the specific humidity of the air stream #2, w2 (lbm H2O/lbm air)? What is mass flow rate of dry air in stream #1 (lbm/s)? What is mass flow rate of dry air in stream #2 (lbm/s)? What is the relative humidity of the outlet (%)?
1. Plot the four locations in the psychrometric chart and determine the other properties foreach condition using a psychrometric chart (Appendix 8a and 8b). Locations of air Tdb, °C Twb, °C Ambient air 32 28 Conditioned air 25 20 Air at the dryer inlet 30 23 Air at the dryer outlet 33 27 3. What is the relationship between relative humidity and temperature? What about humidityratio and temperature?
ASHRAE 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 62.1
Exercise 17.6 Air at 20°C and 60% relative humidity is heated to 90°C and then enters a continuous dryer in an adiabatic operation. The air exits at 40 °C. Calculate: a) the inlet volumetric flow rate of air required to remove 20 kg of water/h from the product and b) the required energy to heat the air.
Q2) 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)
ASHRAE PSYCHROMETRIC CHART NO.1 ASHRAE NORMAL TEMPERATURE BAROMETRIC PRESSURE COPYRIGHT 1992 SEA LEVEL 101.325 kPa AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC. SENSIBLE TOTAL P 80 ENTHALPY HUMIDITY RATIO 40. 50. ENTHALPY 20 SATURATION TEMPERATURE C 90 100 30 DeW 10% RELATIVE HUMIDITY 10 20 30 DRY-BULB TEMPERATURE, "C 40 /PSICORUMETRIC CHARI 120 22 110 20 100 50 80
| If the relative humidity at a sea-level site is 50% for a dry-bulb temperature of 80°F (26.5°C), calcu- late the moist-air enthalpy.
Using a psychometric diagram, describe the heating and humidification process from the following data. Initially the air was at dry bulb temperature (DBT) 35 ° C and RH 35%. air preheated to DBT 85 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. for this process, count, a. change in absolute humidity of air from initial to final conditions = ..... (kg water / kg air) b. change in air enthalpy from initial to final conditions = ..... (kj / kg air)
f. A single-family detached residence of moderate construction has a total sensible load of 53,300 Btu/hr. The design humidity ratio is 0.021 lb of vapor/lb of dry air. Determine the total cooling load.
11 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.
JUST NEED QUESTION 2 NOT 1 1. Air at a dry bulb temperature (dbt) of 40 oC and a relative humidity of 30% is heated to a dbt of 80 oC. Using psychrometric chart to determine: a. The change in moisture content per kg of dry air. b. The change in enthalpy from the initial unheated air to heated air. 2. The previous heated air is then conveyed through a humidifier to raise its relative humidity to 25%. Using psychrometric chart to determine: a. The change in moisture content per kg of dry air. b. The change in enthalpy from the heated air to final humidified air. Hint: the humidifier changes the humidity ratio without changing dry bulb temperature.