Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content Example 03a: Values from dry bulb temperature 'tdb' and wet bulb temperature 'twb' Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)' Copyright information About copyright in the CED Engineering course PDF for: 'Air Conditioning Psychrometrics' © A. Bhatia Snippet kind INFO Keywords thermodynamics Psychrometrics humid air temperature dry bulb temperature wet bulb temperature relative humidity absolute humidity psychrometer sling psychrometer Previous snippet Full quote Example The dry bulb reading is 78°F and the wet bulb is 58°F. Using the chart determine the following values. Answer Relative humidity = 28% Dew Point = 42 degrees Absolute humidity = .0056 lbs water / lb dry air Specific volume = 13.65 cu-ft/lb dry air [Specific] Enthalpy = 25 Btu’s/lbs dry air Next snippet In the course PDF for 'CED Engineering: Air Conditioning Psychrometrics (A.Bhatia)' the term "enthalpy (h)" usually refers to the mass-specific enthalpy per dry air (in CoolProp notation 'Hda') Related snippets A sling psychrometer gives a dry-bulb temperature of 78°F and a wet-bulb temperature of 65°F. Determine other moist air properties from this information. Related snippets (backlinks) The dry bulb reading is 70°F and the wet bulb is 54°F. Using the chart determine the following values. Using the chart determine the following values: Relative humidity; Dew Point; Absolute humidity; Specific volume; [Specific] enthalpy. The dry bulb reading is 85°F and the wet bulb is 60F. Using the chart determine the following values. Using the chart determine the following values: Relative humidity; Dew Point; Absolute humidity; Specific volume; [Specific] enthalpy. Calculate the amount of sensible heat that must be added to 100lb of air at 85°F dry bulb and 75°F wet bulb to raise the temperature of air to 100°F dry bulb. Determine the cooling required to sensibly cool 20,000 cfm of air from a temperature of 90 F and a relative humidity of 60% to a temperature of 75 F. Ninety cubic-ft of lumber is dried at 140°F 'tdb' and 125.6°F 'twb'. The drying rate of the lumber is 5.68 lb of water per hour. If outside air is at 80.6°F 'tdb' and 80% relative humidity how much outside air is needed per min to carry away the moisture? Determine the amount of sensible heat needed to increase the temperature of air from 50°F and 50% RH to 90°F. How much moisture is added to 20 lb of air going from 50°F, 50% RH to 80°F, 60% RH? Hot humid day 90°F and 90% RH. Condition the air to 70°F at about 50% RH. Chill the air to condense out enough moisture to dehumidify it: goal is air with absolute humidity not exceeding 0.008 lbs of moisture per pound of air. Show processes. Determine the total, sensible and latent cooling required cooling 20,000 cfm of air from a temperature of 90 F and a relative humidity of 60% to a temperature of 55 F and 100% relative humidity. On [a] psychrometric chart, this process is represented as [a] line sloping downward and to the left. This process is assumed to occur as simple cooling first and then condensation. While the moisture is condensing the air is assumed to remain saturated. Visit also Visit also (backlinks) Flags
