What is the error in per cent resulting from chart design when the heat required to heat 65°F air with 90 per cent relative humidity to 105°F is determined from the adiabatic saturation lines?
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- 150cfm of saturated air at 85F dry bulb temperature is adiabatically mixed with 75cfm of air at 65F dry bulb temperature and 30% relative humidity. The mixture dry bulb temperature is most likely: 67F 72F 75F 78F 80FDuring performances, a theatre experiences a sensible heat load of 500,000 Btu/hr and moisture load of 175 lb/hr. Air enters the theatre at 65°F and 55% relative humidity and is removed when it reaches 75°F or 60% relative humidity, whichever comes first. What is the ventilation rate in mass of air per hour?Using PSYCHROMETRIC CHART, find the unknown properties of the following conditions below: Pair=97.6kPa, P=100 kPa and tdry = 35oC Where: RH= relative humidity tdry=dry bulb temperature twet =wet bulb temperature h= enthalpy Pair= dry air pressure w = humidity ratio
- Moist air enters a duct at 10 °C, 80 % RH, and a volumetric flow rate of 150 m3/min. The mixture is heated as it flows through the duct and exits at 30 °C. No moisture is added or removed, and the mixture pressure remains approximately constant at 1 bar. For steady-state operation the rate of heat transfer, in kJ/min; and the relative humidity at the exit. Compare your result with the psychrometric chart analysis ans no.3......urgent5-An unsaturated air stream is undergoing adiabatic saturation process and the outgoing air is saturated. Draw the system schematically. Represent the process on T-s and psychrometric charts. Find, for the incoming stream of air, humidity ratio from the adiabatic saturation equation obtained from heat balance?In a cooling tower, the required make up water is 18.5 kg/s. Atmospheric air at 100 kPa, 25°C db, 50% relative humidity enters the cooling tower and exits at 35°C db, 80% relative humidity. What is the mass flow rate of dry air across the cooling tower?
- PLEASE SOLVE ANY TWO QUESTIONS. a) Air at 80°F DB and 50% RH is cooled and dehumidified to 50°F and 100% RH. What is the rate of latent heat removed from 1,000 CFM of air? b) If 500 CFM of outside air at 96°F DB and 76°F WB is mixed with 1,500 CFM of return air at 80°F DB and 50% RH, what is the specific humidity of the mixed air stream? c) A room has a sensible cooling load of 32,000 Btu/hr. The room latent load is 12,000 Btu/hr. What sensible heat factor results from these loads? d) Air at 40°F DB enters a furnace with a heating capacity of 50,000 Btu/hr. If the temperature of the air is increased to 90°F, what is the air flow rate supplied to the furnace? e) Find the enthalpy of air whose dry bulb temperature is 76°F with a humidity ratio of 60 grains/lb f) Air at 30°F DB and 80% RH is heated to 75°F DB by passing it over a heating coil (i.e. sensible heating only) What is the wet-bulb temperature of the heated air?Example 1: Moist air at 32C db, 24C wb. Determine: - Relative humidity RH, Dew temperature, Specific humidity .There are 500 cubic meter per min of atmospheric air initially at 25 C dry bulb temperature and 80% RH flowing thru a steam heated coil . After heating, the final temperature is increase by 10 C. For ideal process, plot the process on the psychrometric chart and label completely the points. Determine the following : final air relative humidity final air specific humidity heating required in kW
- A combination air cooler and dehumidification unit recover outside ambient air at 35 oC, 100 kPa, 90% relative humidity. This air-water vapor mixture is first cooled to a low temperature to condense the proper amount of water, after which the air-vapor mixture is heated, leaving the unit at 20 oC, 30% relative humidity. The volume flow rate of the air-vapor mixture at the exit conditions is 0.01 m3/s. Find the temperature to which the mixture is initially cooled, and the mass of water condensed per kilogram of dry air. Assuming that all the liquid water condensed leaves the unit at the minimum temperature, calculate the overall heat transfer rate.7. How much of a cold air stream at 18°C, 80% relative humidity should be mixed with 5.8 kg da/s of a warm air stream at 35°C, 60% relative humidity to obtain mixed air at 26°C? Express your answer in kg da/s. Assume the mixing process is adiabatic and at standard atmospheric pressure. In your written solution, draw the process in the psychrometric chart.Read the question carefully and give me right solution according to the question. One m3/s of air at 12°C and 50% RH is heated and humidified using saturated steam at 100 °C to a final state of 38°C and 50% relative humidity. Sketch the process on the psychrometric chart and calculate the following: (a) Mass flow rate (b) Steam flow rate needed (c) Heating coil capacity