On a day when the air temperature is 70°F, a fellow student reads the psychrometer in the physical science lab and tells you that with a wet-bulb depression of 3°F, the relative humidity is 83%. Would you agree? Explain.
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On a day when the air temperature is 70°F, a fellow student reads the psychrometer in the physical science lab and tells you that with a wet-bulb depression of 3°F, the relative humidity is 83%. Would you agree? Explain.
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- On a winter day, the air temperature is −5°C, and the humidity is 0.001 kg/m3. (a) What is the relative humidity (in percent)? (b) When this air is brought inside a building, it is heated to 35°C. If the humidity isn't changed, what is the relative humidity (in percent) inside the building?The wind-chill index is modeled by the function W = 13.12 + 0.6215T – 11.37v0.16 + 0.3965TV0.16 where T is the temperature (°C) and v is the wind speed (km/h). When T = -19°C and v = 39 km/h, by how much would you expect the apparent temperature W to drop if the actual temperature decreases by 1°C? (Round your answers to two decimal places.) °C What if the wind speed increases by 1 km/h? ㅇCConsider two identical buildings: one in Los Angeles, California, where the atmospheric pressure is 101 kPa and the other in Denver, Colorado, where the atmospheric pressure is 83 kPa. Both buildings are maintained at 21°C, and the infiltration rate for both buildings is 1.2 air changes per hour (ACH). That is, the entire air in the building is replaced completely by the outdoor air 1.2 times per hour on a day when the outdoor temperature at both locations is 10°C. Disregarding latent heat, determine the ratio of the heat losses by infiltration in the two cities.
- On a summer day in Houston, the temperature is 35 C and the realative humidity is 77 percent A) What is the humidity? B) To what temperature could the air be cooled before condensation starts to take place? (That is, what is the dew point?)The following data are given for the pressure and temperature variation in air as a function of elevation: Elevation in [m] 0. Temperature in [°C]_pressure [atm] 28 1. 1000. 25 0.796 2000. 19 0.6314 3000. 12 0.4982 4000. 3 0.3905 5000. -1 0.3043 6000. 11 0.2356 You want to check if these measurements are correct. You are going to use a balloon and rise in the corresponding altitudes. If the balloon weighs 1000kg (all included, weight of yourself, equipment, inflated part etc) calculate the volume of inflated part of the balloon, so that the initial acceleration is 15m/s?. Assume that the balloon is a sphere and neglect the deflated part of the balloon as far as volume is concerned. Can you verify all measurements with this volume of the balloon? What kind of adjustments do you need to make in order to complete your mission?The atmosphere of the planet Mars is 95.3% carbon dioxide (CO2) and about 0.03% water vapor. The atmospheric pressure is only about 600 Pa, and the surface temperature varies from -30°C to -100°C. The polar ice caps contain both CO2ice and water ice. Could there be liquid CO2 on the surface of Mars? Could there be liquid water? Why or why not? [please answer all questions. thank you]
- Example: A water tank with a wall thickness of 10 mm and a water temperature of 90 "C.) Calculate the average heat loss per square meter (unit area) if the ambient air temperature is 15 "C. Take the thermal conductivity coefficient of the wall material 50 W / m C, the water heat-convection coefficient of 2800 W/m2°Cand the heat-convection coefficient of the ambient air 11 W/m2°C. Calculate the two temperatures of the wall surfaces.The dry and wet bulb temperatures inside a 2500 ft² house with 8 ft ceilings are measured to be 75°F and 68°F respectively. How many gallons of moisture must be removed from the house by dehumidification to bring the humidity down to 65%, the ASHRAE 62.1 recommended maximum, while maintaining a dry bulb temperature of 75°F? 7The temperature and humidity in the valley in the early afternoon were 29 °C and 30%, respectively. Later, dry winds sweeping across the valley carried away 4.0 grams of water vapor from each cubic meter of air. The temperature during at that time had increased to 32 °C. What was the humidity (in %) then? Humidity vs Temperature Table is below: (°C) (g/ur) 10 9 16 13 21 18 24 22 29 30 32 35 14.3 16.7 12.3 O 16.0 O None of these
- On a hot Saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 24°C. At noon the air conditioner is turned off, and the people go home. The temperature outside is a constant 34°C for the rest of the afternoon. If the time constant for the building is 5 hr, what will be the temperature inside the building at 3:00 P.M.? At 5:00 P.M.? When will the temperature inside the building reach 26°C? RIB °C. At 3:00 P.M., the temperature inside the building will be about (Round to the nearest tenth as needed.)On a cold day (by Orlando standards), you turn on the TV to hear the meteorologist say that the temperature outside is 28.8 degrees Fahrenheit. What is this in degrees Kelvin?On a hot Saturday morning while people are working inside, the air conditioner keeps the temperature inside the building at 24°C. At noon the air conditioner is turned off, and the people go home. The temperature outside is a constant 32°C for the rest of the afternoon. If the time constant for the building is 3 hr, what will be the temperature inside the building at 3:00 P.M.? At 5:00 P.M.? When will the temperature inside the building reach 26°C? At 3:00 P.M., the temperature inside the building will be about °C. (Round to the nearest tenth as needed.)