Tutorial for Psyc0226
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Transcript of Tutorial for Psyc0226
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Tutorial for Psyc0226
Wei Fang, Ph.D., ProfessorDept. of Bio-Industrial Mechatronics Engineering
National Taiwan University
Software last updated: 2002/02/26Tutorial last updated: 2003/11/28
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Capability of Psyc0226
Allow alteration on atmospheric pressure
Provide handy PsyTablesTotally 11 tables are available
Provide PsyChartsState calculation: besides AtmP, values of 2 independent states are required to calculate othersProcess calculation: find differences between 2 statesMore process calculation:
Evaporative cooling Vapor pressure deficit on leaf
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Abbreviations of thermodynamic properties of moist air used in Psyc0226
1. Tdb: dry bulb Temp. 2. RH : relative humidity3. Twb: Wet bulb Temp.4. Tdp: dew point Temp.5. AH : absolute humidity 6. SV : specific volume7. Hfg: Saturated 8. DOS: degree of Saturation9. Pws: saturated vapor pressure10. Pw: vapor pressure
More message of the selected cell
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Block in red defined as Psychart window
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Set the Atmospheric pressure is the first step
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Handy PsyTables
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Totally 11 PsyTables
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User friendly 3-step design in PsyTable
1. Define the ranges
3. List the values
2. Set the intervals
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Table 1: Twb = f(Tdb, RH)
RH (50 – 100%)and Tdb (20 – 44 oC)
Twb
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Table 2: WBD = f(Tdb,RH)
WBD
Wet Bulb Depression is the limit of evaporative cooling methods.
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Table 3: RH = f(Tdb,Twb)
Twb (20 – 44 oC) and Tdb (20 – 44 oC)
RH
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Table 4: VPD of air
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VPD/AHD of air
VPD=Pws@Tdb – Pw@TdbAHD=Sat.AH@Tdb – Sat.AH@Tdp
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Table 5: VPD’ of air
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VPD’/AHD’ of air
VPD’=Pw@Twb – Pw@TdbAHD’=Sat.AH@Twb – Sat.AH@Tdp
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PsychartsBesides atmospheric pressure, values of 2
independent states are required to derive
others
find differences between 2 states
Evaporative cooling process calculation
Vapor pressure deficit on leaf
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State Calculation
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Independent Properties (IP)Twb
RH Tdp AH SV H hfg DOS
Pws
Pw
Tdb IP IP IP IP IP IP IP IP
Any pair of IP can be the given values to derive others.
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One click in Psychart window using left button of the mouse can define a
state
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Process Calculation
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Use mouse to define 2 states
1. To define 2nd state, change from ‘Inactive’ to ‘Active’ first.
2. Click in the Psychart window at the selected state or click on the crosshair region to move along constant lines or curves.
3. Click on ‘Cal.’ to calculate the difference.
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Move along prefix lines or Curves
Constant Tdp, Pw,
AH
Constant Twb
Constant RH
Constant Twb
Constant Tdp, Pw,
AH
Constant RH
Constant Tdb
Constant Tdb
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A process with sensible heat gain
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Process: between states
Sensible Heating (3->4)Sensible Cooling (4->3)Humidification (4->5)Dehumidification (5->4)Heating (3->5, 3->1)Cooling (5->3, 1->3)Air Mixing (1, 2->3)Evaporative Cooling , Drying (1->2, 1->3)Combination of above (1->2->3->4->5)
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Evaporative cooling process
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Enter ‘Tdb after pad’ or ‘pad efficiency’ to derive others followed by a Click on
‘Draw’ icon.
WBD
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Temperature drop after passing through pad
(ΔT)ΔT = WBD of outdoor x Efficiency of the pad
T T- ΔT
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Vapor pressure deficit (VPD)
VPD
Enter Leaf temperature, then click on Draw icon.
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Other user friendly designs
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Lines and curves can be visible or hidden by (de)selecting
related icons
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Zoom in & out
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Labels in Psychart window can be hidden by de-select the Unit label
icon
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The state user defined in the psychart window using left button of the mouse will be placed in
the center of the psychart window if the Centralize icon was selected. This option is set
inactive by default.
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Enjoy playing with
Digital PsychartPlease send us information regarding found bugs.
Mail to : [email protected]