The higher the relative humidity, the better it could be to spray herbicides. Which would be...
a) Define relative humidity (2 marks) b) Describe the relation between relative humidity, the capacity of air to hold moisture a ambient temperature. (2 marks) c) Moist air at 22°C and a wet bulb temperature of 9°C enters a steam spray humidifier. The mass flow of the dry air is 90 kg/min. Saturated water vapor at 110 °C is injected into the mixture at a rate of 52 kg/hr. There is no heat transfer with the surroundings, and the pressure...
1.What are the relative humidity, humidity ratio, dew point, and enthalpy for a condition where the dry‐bulb temperature is 95 oF and the wet‐bulb temperature is 70 oF? 2.What are the relative humidity, enthalpy and humidity ratio of moist air with the dry bulb temperature of 26.5 oC and dew point of 15 oC?
On a particular summer day, the temperature is 30.0°C and the relative humidity is 77.0% (which means that the partial pressure of water vapor in the ambient air is 77.0% of the equilibrium vapor pressure of water). A sample of this air is placed in a 1.00 L flask, which is then closed and cooled to 5.00'C. A: 30.0°C, the vapor pressure of water is 31.8 mmHg. and at 5.00°C is 6.50 mmHg. What is the mass (in grams) of...
Use a psychrometric chart to determine the properties of air under different conditions. 1-Find the properties of air at 70 degrees F and 50% relative humidity. Find humidity ratio, wet bulb temperature, dew point, enthalpy, and specific volume. 2-Find the properties of air at 55 degrees F and 30% relative humidity. Find humidity ratio, wet bulb temperature, dew point, enthalpy, and specific volume. 3-Air enters a furnace at a dry bulb temperature of 60 degrees F and 50% relative humidity...
a) Define, in words the following 0 the humidity ratio in relative humidity (6 marks) ) dew point temperature b) Explain the principle of operation of a whirling hygrometer (sing psychrometer) (4 marks) ) Various psychrometric processes (0-1, 0-3,0-4,0-5) are shown in the figure below. Match the processes to the following: Cooling with dehumidification Sensible heating Humidification with steam injection Humidification with water injection (4 marks) d) On a particular day the weather forecast states that the dry bulb temperature...
1. (relative humidity) The partial pressure of water vapor in air is usually less than the equilibrium vapor pressure (or saturation pressure) at the ambient temperature; this is why a cup of water will spontaneously evaporate. The ratio of the partial pressure of water vapor to the equilibrium vapor pressure (at the same temperature) is called the relative humidity. Saturated air, at 100% relative humidity, would be in equilibrium with a cup of liquid water. The saturation pressure depends strongly...
1 kg of atmospheric air initially at 30 ºc and 60% relative humidity is cooled slowly, at a constant pressure of 100 kPa, to a final temperature of 5 ºc. a. What is the saturation pressure of water at the initial temperature? b. What is the partial pressure of water vapor (vapor pressure) at the initial condition? c. What is the partial pressure of dry air at the initial condition? d. What is the initial humidity ratio? e. What is...
1) An air-water vapor mixture at 95°F has a relative humidity of 45%. Calculate the partial pressure of the water vapor and its dew-point temperature. (Hint: Psychrometric chart is really useful for this.)
On a summer day the pressure is 1 atm, the temperature is 32°C, and the relative humidity is 95 percent. This air is to be conditioned to 24°C and 60 percent relative humidity. a) Determine the amount of cooling, in kJ, required and b) Water removed, in kg, per 1000 m3 of dry air processed at the entrance to the system. Cooling coils Ti 32С ф,-95% т,-24°C φ2 60% l atm Condensate Cooling coils Ti 32С ф,-95% т,-24°C φ2 60%...
Determine which score corresponds to the higher relative position. 25) Which is better, a score of 92 on a test with a mean of 71 and a standard deviation of 15, or a Score of 688 on a test with a mean of 493 and a standard deviation of 150? Use the empirical rule to solve the problem. 26) The systolic blood pressure of 18-year-old women is normally distributed with a mean of 120 mmHg and a standard deviation of...