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. Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Example 11: Total (qDotTot), sensible (qDotSen), and latent cooling (qDotLat) required for cooling air Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
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. Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
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. Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Example 10: Condition and dehumidify air by chilling and condensing some moisture: Process table Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
Example 09: Moisture added to air: Amount (mass) Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
How much moisture is added to 20 lb of air going from 50°F, 50% RH to 80°F, 60% RH? Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Example 08b: Humidification: As a 2-step (3-state) process Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
Determine the amount of sensible heat needed to increase the temperature of air from 50°F and 50% RH to 90°F. Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
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? Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Example 08a: Humidification: Drying lumber with air: required volumetric air flow rate Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
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. Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Example 07: Sensible cooling: 'qDotSen' (-ve): energy transfer rate FROM humid air Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
Example 06: Sensible heating: 'qSen' per mass (+ve): energy transfer TO humid air Gallery Tutorial TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class Section Slide kind plot table
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. Source CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'
Heat released by a system into its surroundings is by convention a negative quantity (Q < 0); when a system absorbs heat from its surroundings, it is positive (Q > 0). Source Wikipedia
Webel: Psy/MPsy: Psychrometrics for Mathematica: CONVENTION: 'Q' as a quantity symbol in equations indicates the energy GAINED BY the system as heat energy transfer; 'W' indicates the work DONE BY the system on its external surroundings.
In thermodynamics, heat is defined as the form of energy crossing the boundary of a thermodynamic system by virtue of a temperature difference across the boundary Source Wikipedia
Defined quantitatively, the heat involved in a process is the difference in internal energy between the final and initial states of a system, and subtracting the work done in the process. This is the formulation of the first law of thermodynamics. Source Wikipedia
Heat is energy in transfer to or from a thermodynamic system, by a mechanism that involves the microscopic atomic modes of motion or the corresponding macroscopic properties. Source Wikipedia
A thermodynamic system does not contain heat. Nevertheless, the term is also often used to refer to the thermal energy contained in a system as a component of its internal energy and that is reflected in the temperature of the system. Source Wikipedia
In thermodynamics, heat is energy in transfer to or from a thermodynamic system, by mechanisms other than thermodynamic work or transfer of matter. Source Wikipedia
