Concept explainers
What is the difference between dry air and atmospheric air?
The difference between dry air and atmospheric air.
Explanation of Solution
The presence of humidity is the biggest difference between dry air and atmospheric air. Humidity is present in atmospheric air whereas there is no humidity in dry air.
Dry air is stated as air that contains zero water vapor and has a low relative humidity. Atmospheric air is called as the air which is usual under atmospheric conditions and is unlike for changed locations and dependent on wind patterns. They usually contain humidity.
Hence, dry air is air with no humidity and atmospheric air has humidity.
Want to see more full solutions like this?
Chapter 14 Solutions
Thermodynamics: An Engineering Approach
Additional Engineering Textbook Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Mechanics of Materials (10th Edition)
Applied Statics and Strength of Materials (6th Edition)
Engineering Mechanics: Statics & Dynamics (14th Edition)
Vector Mechanics for Engineers: Statics and Dynamics
- Define the range of permissible values for the barometric pressure, relative humidity, and temperature in your environment.arrow_forwardIn your own words, answer the following questions: 1. What is the dew-point temperature? 2. How does the air motion in the vicinity of the human body affect human comfort? 3. What is the difference between dry air and atmospheric air? 4. Describe the difference between mass fraction and mole fractionarrow_forwardWhat is the importance of supersaturation in precipitationarrow_forward
- "For an air-water system at a given moisture content, the temperature decreases as the humidity increases."Is this statement true or false? Shouldn't it be relative humidity?arrow_forward1. In the process of air conditioning in a humidifier, the air at a dry bulb temperature of 20 °C and 25% RH increases its RH to 40%. Determine the amount of moisture added in the humidifier per kg of dry air. = (kg water/kg air). 2. The air has a dry bulb temperature of 34 °C and a wet bulb temperature of 22°C. The liquid is heated in a heater so that the dry bulb temperature increases to 80 °C. Then the air is passed through the corn kernels to dry. The air coming out of the corn kernels is at bulb temperature. dry 55 °C Then this air is passed to the dehumidifier to reduce its RH to 10%. Draw the course of the air change process on a psychrometric diagram. The rate of air flow through the corn kernels and dehumidifier is 4.0 m/s and the cross-sectional diameter of the pile is 0.7 m. a) Determine the amount of water content lost from the pile of corn kernels (in grams of water/second) b) Determine the amount of water content lost from the air when passing through the…arrow_forwardAir enters a cooling tower at a rate of 1100 cubic meters per minute, at 15°C and 65% relative humidity. Atmospheric pressure is 100 kPa. Water enters the tower at 38°C and leaves at 17°C. Air leaves the tower at 31°C and saturated. Using a psychrometric chart calculate the absolute humidity of the air leaving the cooling tower. 0.029 kg water vapour/kg air 0.069 kg water vapour/kg air O 0.0101 kg water vapour/kg air 0.364 kg water vapour/kg airarrow_forward
- Please assist with this Thermodynamics question. It's urgent.Thanks in advancearrow_forwardAn auditorium seating 1800 people in three consecutive sitting for 6 hours, is to be maintained at 25°C dry bulb and 20°C wet bulb temperatures with outdoor air at 35°C dry bulb and 60% relative humidity. Conditioned air enters the auditorium at 15°C. Ventilation requirement is 8 m³/hr per person. Solar and other heat loads amount to 108,000 KJ/hr. The sensible and latent heat loads from the occupants is 275 KJ/hr per person and 150 KJ/hr per person, respectively. The ventilation load is nearest to what value? 266.64 kw 29.63 kw 115 kw 44.12 kwarrow_forwardHumid air enters an adiabatic turbine at P1 = 300 kPa and T1 = 190°C with 7.5% relative humidity. The flow exits the turbine in saturated conditions at P2 = 100 kPa. If mass flow rate (of dry-air) is 2.5 kgd.a./s, determine: a. The absolute humidity at the inlet. b. The temperature T2 of the flow at the outlet. c. The power produced by the turbine in kW. d. Sketch this process on a psychometric diagram.arrow_forward
- Atmospheric air at a pressure of 1 atm and dry-bulb temperature of 28°C has a dew-point temperature of 20°C. Using the psychrometric chart, determine the adiabatic saturation temperature of the humid air. 1 atm 28°C To=20°C Air Water Humidifier 100% The adiabatic saturation temperature of the humid air is °C.arrow_forwardWhat is the change in enthalpy (in Btu/lb) of carbon dioxide gas if the change in internal energy is 100 Btu/lb?arrow_forwardCan you make a schematic diagram for this problem? 600 lps of air at 30°C dry-bulb and 22°C wet-bulb temperatures is heated to a temperature of 45°C and enters the dryer. The air leaves the dryer adiabatically and its relative humidity is 70%. Determine: (a.) The water evaporated kg/hr; (b.) The volume air leaving the dryer in cu.m/min; and (c.) kJ requirement of the dryer per kg of water evaporated.arrow_forward
- Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning