8. Consider two rooms that are identical except that one is maintained at 25°C and 40 percent relative humidity while the other is maintained at 20°C and 55 percent relative humidity. Noting that the amount of moisture is proportional to the vapor pressure, determine which room contains more moisture. Is this the answer you were expecting? Comment on your results. 9. For problem 8 above, what is the difference in the partial pressures of oxygen in each room? Recall that air contains about 78% Nitrogen, 21% Oxygen, and 1% trace gases.

8. Consider two rooms that are identical except that one is maintained at 25°C and 40 percent relative humidity while the other is maintained at 20°C and 55 percent relative humidity. Noting that the amount of moisture is proportional to the vapor pressure, determine which room contains more moisture. Is this the answer you were expecting? Comment on your results. 9. For problem 8 above, what is the difference in the partial pressures of oxygen in each room? Recall that air contains about 78% Nitrogen, 21% Oxygen, and 1% trace gases.

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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Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A room contains air at 85°F and 13 psia at a relative humidity of 60 percent. Use data from the tables. Determine the partial pressure of dry air. (You must provide an answer before moving on to the next part.) The partial pressure of dry air 14 psia.
What is the relative humidity when the temperature is 30 degrees centigrade (celcius) and the water vapor content is 14 g/kg? Show your calculation.
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
A sample of air has a dry-bulb temperature of 30 °C and a wet-bulb temperature of25 °C. The barometric pressure is 101 kPa. Calculate:(a) the humidity ratio if this air is adiabatically saturated, (b) the enthalpy of the air if it is adiabatically saturated, (c) the humidity ratio of the sample (c) the humidity ratio of the sample (e) the relative humidity
Using your psychrometric chart, solve the properties of air at 23 °C and relative humidity of 50%.
Example 3.8- Saturated air at 21 °C is passed through a drier so that its final relative humidity is 20%. The drier uses silica gel adsorbent. The air is then passed through a cooler until its final temperature is 21 °C without any change in its specific humidity. Determine: 1. the temperature of air at the end of the drying process; 2. The heat rejected during the cooling process; 3. the relative humidity at the end of the cooling process; 4. the dew point temperature at the end of the drying process; and 5.the moisture removed during the drying process.
Is it possible that during sensible cooling process the condition of air reaches a relative humidity of more than 100%.
For Questions 6 and 7 The dry-bulb temperature and wet-bulb temperature of a sample of air are 23°C and 18°C, respectively. The pressure of the air is 97 kPa. If the air was adiabatically saturated: Question 6 Calculate the humidity ratio in kg of vapor per kg of dry air. Round your answer to 5 decimal places. Add your answer Question 7 What is its degree of saturation in %? Round your answer to 0 decimal places. Add your answer
9. A rice warehouse is air conditioned at 25 "C under atmospheric pressure along with a specific humidity of 0.015 kg moisture/kg dry air to store 50 tonnes of rice. Using a Psychrometric chart, determine ia. The enthalpy of air in the room b. The relative humidity in the room c. The wet-bulb temperature d. The dew-point temperature c. The specific volume of the air
Read the question carefully. Don't miss any calculations. The recycled duct air in a centralized air conditioning system takes in air at a rate of 60 m3/min with a dry bulb temperature of 20 oC and 30% relative humidity. The recycled air is mixed adiabatically with fresh outdoor air at a rate of 80 m3/min with a dry bulb temperature of 30 oC and 50% relative humidity. Calculate the volumetric flow rate, dry bulb temperature and relative humidity of the mixed air stream. Use the psychrometric chart to get property data and plot the process on the psychrometric chart.
1. Water at 30 °C flows into a cooling tower at the rate of 1.15 kg per kg air. Air enters the tower at the dbt of 20 °C and a relative humidity of 60 % and leaves it at a dbt of 28 °C and 90% relative humidity. Makeup water is supplied at 20 °C. Atmospheric pressure remains at 1 atm. Determine (a) the temperature of water leaving the tower, (b) the fraction of water evaporated, and (c) the approach and range of the cooling tower. Draw the temperature relationship.
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